* kernel BUG at /usr/src/kernel/lib/dynamic_debug.c:267!
@ 2020-09-09 4:54 Naresh Kamboju
2020-09-09 5:47 ` Masami Hiramatsu
0 siblings, 1 reply; 8+ messages in thread
From: Naresh Kamboju @ 2020-09-09 4:54 UTC (permalink / raw)
To: Linux-Next Mailing List, open list, lkft-triage
Cc: jbaron, Steven Rostedt, Ingo Molnar, Masami Hiramatsu, jim.cromie
While testing livepatch test cases on x86_64 with Linux next 20200908 tag kernel
this kernel BUG noticed several times.
metadata:
git branch: master
git repo: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
git commit: dff9f829e5b0181d4ed9d35aa62d695292399b54
git describe: next-20200908
kernel-config:
http://snapshots.linaro.org/openembedded/lkft/lkft/sumo/intel-corei7-64/lkft/linux-next/853/config
kernel BUG log,
----------------------
[ 634.063970] % rmmod test_klp_livepatch
[ 634.114787] test_klp_atomic_replace: this has been live patched
[ 634.121953] % echo 0 > /sys/kernel/livepatch/test_klp_atomic_replace/enabled
[ 634.129391] livepatch: 'test_klp_atomic_replace': starting
unpatching transition
[ 634.143990] livepatch: 'test_klp_atomic_replace': unpatching complete
[ 634.156223] % rmmod test_klp_atomic_replace
[ 634.235451] ------------[ cut here ]------------
[ 634.240314] kernel BUG at /usr/src/kernel/lib/dynamic_debug.c:267!
[ 634.246584] invalid opcode: 0000 [#1] SMP PTI
[ 634.250955] CPU: 0 PID: 12791 Comm: test-livepatch. Tainted: G
W K 5.9.0-rc4-next-20200908 #1
[ 634.260615] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS
2.2 05/23/2018
[ 634.268007] RIP: 0010:ddebug_exec_query+0x77b/0xb90
[ 634.272886] Code: 4c 89 ad 70 ff ff ff e9 db fb ff ff b8 03 00 00
00 e9 20 fb ff ff b8 02 00 00 00 e9 16 fb ff ff b8 01 00 00 00 e9 0c
fb ff ff <0f> 0b 31 c0 e9 03 fb ff ff 49 89 f4 48 89 f7 e9 78 f9 ff ff
8b 15
[ 634.291630] RSP: 0018:ffff9f0c80a5bd18 EFLAGS: 00010246
[ 634.296856] RAX: 000000000000003d RBX: 0000000000000000 RCX: 0000000000000000
[ 634.303987] RDX: 000000000000003d RSI: 0000000000000000 RDI: ffff90db906583ec
[ 634.311111] RBP: ffff9f0c80a5bde8 R08: 000000000000000a R09: 000000000000003b
[ 634.318236] R10: ffff90db92610000 R11: 0000000000000246 R12: ffff90db906583ec
[ 634.325368] R13: ffffffffbe87cbc0 R14: 0000000000000000 R15: 0000000000000004
[ 634.332500] FS: 00007fd37249a740(0000) GS:ffff90dbefa00000(0000)
knlGS:0000000000000000
[ 634.340578] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 634.346315] CR2: 0000000000e6d00c CR3: 000000026a4b8004 CR4: 00000000003706f0
[ 634.353446] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 634.360570] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 634.367693] Call Trace:
[ 634.370139] ? lock_acquire+0xa6/0x390
[ 634.373892] ? __might_fault+0x34/0x80
[ 634.377648] ddebug_exec_queries+0x6e/0x140
[ 634.381831] ddebug_proc_write+0x4b/0xa0
[ 634.385756] full_proxy_write+0x5f/0x90
[ 634.389595] vfs_write+0xed/0x240
[ 634.392915] ksys_write+0xad/0xf0
[ 634.396233] ? syscall_trace_enter+0x17a/0x240
[ 634.400670] __x64_sys_write+0x1a/0x20
[ 634.404416] do_syscall_64+0x37/0x50
[ 634.407993] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 634.413038] RIP: 0033:0x7fd371b84144
[ 634.416617] Code: 89 02 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00
00 00 00 00 66 90 48 8d 05 c1 e7 2c 00 8b 00 85 c0 75 13 b8 01 00 00
00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 41 54 49 89 d4 55 48 89
f5 53
[ 634.435362] RSP: 002b:00007ffd19447658 EFLAGS: 00000246 ORIG_RAX:
0000000000000001
[ 634.442928] RAX: ffffffffffffffda RBX: 00000000000000bc RCX: 00007fd371b84144
[ 634.450059] RDX: 00000000000000bc RSI: 0000000000e6cf70 RDI: 0000000000000001
[ 634.457181] RBP: 0000000000e6cf70 R08: 00000000000000e9 R09: 0000000000000000
[ 634.464305] R10: 00007ffd19447c48 R11: 0000000000000246 R12: 00007fd371e4e760
[ 634.471429] R13: 00000000000000bc R14: 00007fd371e49760 R15: 00000000000000bc
[ 634.478559] Modules linked in: trace_printk sch_fq 8021q
iptable_filter xt_mark ip_tables cls_bpf sch_ingress veth algif_hash
x86_pkg_temp_thermal fuse [last unloaded: test_klp_atomic_replace]
[ 634.495695] ---[ end trace d04d7e11bd1458bf ]---
[ 634.500333] RIP: 0010:ddebug_exec_query+0x77b/0xb90
[ 634.505218] Code: 4c 89 ad 70 ff ff ff e9 db fb ff ff b8 03 00 00
00 e9 20 fb ff ff b8 02 00 00 00 e9 16 fb ff ff b8 01 00 00 00 e9 0c
fb ff ff <0f> 0b 31 c0 e9 03 fb ff ff 49 89 f4 48 89 f7 e9 78 f9 ff ff
8b 15
[ 634.523969] RSP: 0018:ffff9f0c80a5bd18 EFLAGS: 00010246
[ 634.529197] RAX: 000000000000003d RBX: 0000000000000000 RCX: 0000000000000000
[ 634.536330] RDX: 000000000000003d RSI: 0000000000000000 RDI: ffff90db906583ec
[ 634.543462] RBP: ffff9f0c80a5bde8 R08: 000000000000000a R09: 000000000000003b
[ 634.550593] R10: ffff90db92610000 R11: 0000000000000246 R12: ffff90db906583ec
[ 634.557727] R13: ffffffffbe87cbc0 R14: 0000000000000000 R15: 0000000000000004
[ 634.564869] FS: 00007fd37249a740(0000) GS:ffff90dbefa00000(0000)
knlGS:0000000000000000
[ 634.572953] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 634.578699] CR2: 0000000000e6d00c CR3: 000000026a4b8004 CR4: 00000000003706f0
[ 634.585829] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 634.592964] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
full test log,
https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20200908/testrun/3171064/suite/linux-log-parser/test/check-kernel-bug-1743477/log
--
Linaro LKFT
https://lkft.linaro.org
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: kernel BUG at /usr/src/kernel/lib/dynamic_debug.c:267!
2020-09-09 4:54 kernel BUG at /usr/src/kernel/lib/dynamic_debug.c:267! Naresh Kamboju
@ 2020-09-09 5:47 ` Masami Hiramatsu
2020-09-09 8:00 ` Petr Mladek
0 siblings, 1 reply; 8+ messages in thread
From: Masami Hiramatsu @ 2020-09-09 5:47 UTC (permalink / raw)
To: Naresh Kamboju
Cc: Linux-Next Mailing List, open list, lkft-triage, jbaron,
Steven Rostedt, Ingo Molnar, Masami Hiramatsu, jim.cromie,
Joe Lawrence, Josh Poimboeuf, Jiri Kosina, Miroslav Benes,
Petr Mladek
Hi Naresh,
Thanks for reporting, it seems that you have run the kselftests/livepatch/test-livepatch.sh.
Then, I think it is better to report to Livepatch maintainers too. (I Cc'd them)
Thank you,
On Wed, 9 Sep 2020 10:24:09 +0530
Naresh Kamboju <naresh.kamboju@linaro.org> wrote:
> While testing livepatch test cases on x86_64 with Linux next 20200908 tag kernel
> this kernel BUG noticed several times.
>
> metadata:
> git branch: master
> git repo: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
> git commit: dff9f829e5b0181d4ed9d35aa62d695292399b54
> git describe: next-20200908
> kernel-config:
> http://snapshots.linaro.org/openembedded/lkft/lkft/sumo/intel-corei7-64/lkft/linux-next/853/config
>
> kernel BUG log,
> ----------------------
> [ 634.063970] % rmmod test_klp_livepatch
> [ 634.114787] test_klp_atomic_replace: this has been live patched
> [ 634.121953] % echo 0 > /sys/kernel/livepatch/test_klp_atomic_replace/enabled
> [ 634.129391] livepatch: 'test_klp_atomic_replace': starting
> unpatching transition
> [ 634.143990] livepatch: 'test_klp_atomic_replace': unpatching complete
> [ 634.156223] % rmmod test_klp_atomic_replace
> [ 634.235451] ------------[ cut here ]------------
> [ 634.240314] kernel BUG at /usr/src/kernel/lib/dynamic_debug.c:267!
> [ 634.246584] invalid opcode: 0000 [#1] SMP PTI
> [ 634.250955] CPU: 0 PID: 12791 Comm: test-livepatch. Tainted: G
> W K 5.9.0-rc4-next-20200908 #1
> [ 634.260615] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS
> 2.2 05/23/2018
> [ 634.268007] RIP: 0010:ddebug_exec_query+0x77b/0xb90
> [ 634.272886] Code: 4c 89 ad 70 ff ff ff e9 db fb ff ff b8 03 00 00
> 00 e9 20 fb ff ff b8 02 00 00 00 e9 16 fb ff ff b8 01 00 00 00 e9 0c
> fb ff ff <0f> 0b 31 c0 e9 03 fb ff ff 49 89 f4 48 89 f7 e9 78 f9 ff ff
> 8b 15
> [ 634.291630] RSP: 0018:ffff9f0c80a5bd18 EFLAGS: 00010246
> [ 634.296856] RAX: 000000000000003d RBX: 0000000000000000 RCX: 0000000000000000
> [ 634.303987] RDX: 000000000000003d RSI: 0000000000000000 RDI: ffff90db906583ec
> [ 634.311111] RBP: ffff9f0c80a5bde8 R08: 000000000000000a R09: 000000000000003b
> [ 634.318236] R10: ffff90db92610000 R11: 0000000000000246 R12: ffff90db906583ec
> [ 634.325368] R13: ffffffffbe87cbc0 R14: 0000000000000000 R15: 0000000000000004
> [ 634.332500] FS: 00007fd37249a740(0000) GS:ffff90dbefa00000(0000)
> knlGS:0000000000000000
> [ 634.340578] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 634.346315] CR2: 0000000000e6d00c CR3: 000000026a4b8004 CR4: 00000000003706f0
> [ 634.353446] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [ 634.360570] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> [ 634.367693] Call Trace:
> [ 634.370139] ? lock_acquire+0xa6/0x390
> [ 634.373892] ? __might_fault+0x34/0x80
> [ 634.377648] ddebug_exec_queries+0x6e/0x140
> [ 634.381831] ddebug_proc_write+0x4b/0xa0
> [ 634.385756] full_proxy_write+0x5f/0x90
> [ 634.389595] vfs_write+0xed/0x240
> [ 634.392915] ksys_write+0xad/0xf0
> [ 634.396233] ? syscall_trace_enter+0x17a/0x240
> [ 634.400670] __x64_sys_write+0x1a/0x20
> [ 634.404416] do_syscall_64+0x37/0x50
> [ 634.407993] entry_SYSCALL_64_after_hwframe+0x44/0xa9
> [ 634.413038] RIP: 0033:0x7fd371b84144
> [ 634.416617] Code: 89 02 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00
> 00 00 00 00 66 90 48 8d 05 c1 e7 2c 00 8b 00 85 c0 75 13 b8 01 00 00
> 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 41 54 49 89 d4 55 48 89
> f5 53
> [ 634.435362] RSP: 002b:00007ffd19447658 EFLAGS: 00000246 ORIG_RAX:
> 0000000000000001
> [ 634.442928] RAX: ffffffffffffffda RBX: 00000000000000bc RCX: 00007fd371b84144
> [ 634.450059] RDX: 00000000000000bc RSI: 0000000000e6cf70 RDI: 0000000000000001
> [ 634.457181] RBP: 0000000000e6cf70 R08: 00000000000000e9 R09: 0000000000000000
> [ 634.464305] R10: 00007ffd19447c48 R11: 0000000000000246 R12: 00007fd371e4e760
> [ 634.471429] R13: 00000000000000bc R14: 00007fd371e49760 R15: 00000000000000bc
> [ 634.478559] Modules linked in: trace_printk sch_fq 8021q
> iptable_filter xt_mark ip_tables cls_bpf sch_ingress veth algif_hash
> x86_pkg_temp_thermal fuse [last unloaded: test_klp_atomic_replace]
> [ 634.495695] ---[ end trace d04d7e11bd1458bf ]---
> [ 634.500333] RIP: 0010:ddebug_exec_query+0x77b/0xb90
> [ 634.505218] Code: 4c 89 ad 70 ff ff ff e9 db fb ff ff b8 03 00 00
> 00 e9 20 fb ff ff b8 02 00 00 00 e9 16 fb ff ff b8 01 00 00 00 e9 0c
> fb ff ff <0f> 0b 31 c0 e9 03 fb ff ff 49 89 f4 48 89 f7 e9 78 f9 ff ff
> 8b 15
> [ 634.523969] RSP: 0018:ffff9f0c80a5bd18 EFLAGS: 00010246
> [ 634.529197] RAX: 000000000000003d RBX: 0000000000000000 RCX: 0000000000000000
> [ 634.536330] RDX: 000000000000003d RSI: 0000000000000000 RDI: ffff90db906583ec
> [ 634.543462] RBP: ffff9f0c80a5bde8 R08: 000000000000000a R09: 000000000000003b
> [ 634.550593] R10: ffff90db92610000 R11: 0000000000000246 R12: ffff90db906583ec
> [ 634.557727] R13: ffffffffbe87cbc0 R14: 0000000000000000 R15: 0000000000000004
> [ 634.564869] FS: 00007fd37249a740(0000) GS:ffff90dbefa00000(0000)
> knlGS:0000000000000000
> [ 634.572953] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 634.578699] CR2: 0000000000e6d00c CR3: 000000026a4b8004 CR4: 00000000003706f0
> [ 634.585829] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [ 634.592964] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>
> full test log,
> https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20200908/testrun/3171064/suite/linux-log-parser/test/check-kernel-bug-1743477/log
>
> --
> Linaro LKFT
> https://lkft.linaro.org
--
Masami Hiramatsu <mhiramat@kernel.org>
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: kernel BUG at /usr/src/kernel/lib/dynamic_debug.c:267!
2020-09-09 5:47 ` Masami Hiramatsu
@ 2020-09-09 8:00 ` Petr Mladek
2020-09-09 12:25 ` Greg Kroah-Hartman
0 siblings, 1 reply; 8+ messages in thread
From: Petr Mladek @ 2020-09-09 8:00 UTC (permalink / raw)
To: Masami Hiramatsu
Cc: Naresh Kamboju, Linux-Next Mailing List, open list, lkft-triage,
jbaron, Steven Rostedt, Ingo Molnar, jim.cromie, Joe Lawrence,
Josh Poimboeuf, Jiri Kosina, Miroslav Benes, Greg Kroah-Hartman
On Wed 2020-09-09 14:47:45, Masami Hiramatsu wrote:
> Hi Naresh,
>
> Thanks for reporting, it seems that you have run the kselftests/livepatch/test-livepatch.sh.
> Then, I think it is better to report to Livepatch maintainers too. (I Cc'd them)
>
> Thank you,
>
> On Wed, 9 Sep 2020 10:24:09 +0530
> Naresh Kamboju <naresh.kamboju@linaro.org> wrote:
>
> > While testing livepatch test cases on x86_64 with Linux next 20200908 tag kernel
> > this kernel BUG noticed several times.
> >
> > metadata:
> > git branch: master
> > git repo: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
> > git commit: dff9f829e5b0181d4ed9d35aa62d695292399b54
> > git describe: next-20200908
> > kernel-config:
> > http://snapshots.linaro.org/openembedded/lkft/lkft/sumo/intel-corei7-64/lkft/linux-next/853/config
> >
> > kernel BUG log,
> > ----------------------
> > [ 634.063970] % rmmod test_klp_livepatch
> > [ 634.114787] test_klp_atomic_replace: this has been live patched
> > [ 634.121953] % echo 0 > /sys/kernel/livepatch/test_klp_atomic_replace/enabled
> > [ 634.129391] livepatch: 'test_klp_atomic_replace': starting
> > unpatching transition
> > [ 634.143990] livepatch: 'test_klp_atomic_replace': unpatching complete
> > [ 634.156223] % rmmod test_klp_atomic_replace
> > [ 634.235451] ------------[ cut here ]------------
> > [ 634.240314] kernel BUG at /usr/src/kernel/lib/dynamic_debug.c:267!
> > [ 634.246584] invalid opcode: 0000 [#1] SMP PTI
> > [ 634.250955] CPU: 0 PID: 12791 Comm: test-livepatch. Tainted: G
> > W K 5.9.0-rc4-next-20200908 #1
> > [ 634.260615] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS
> > 2.2 05/23/2018
> > [ 634.268007] RIP: 0010:ddebug_exec_query+0x77b/0xb90
> > [ 634.272886] Code: 4c 89 ad 70 ff ff ff e9 db fb ff ff b8 03 00 00
> > 00 e9 20 fb ff ff b8 02 00 00 00 e9 16 fb ff ff b8 01 00 00 00 e9 0c
> > fb ff ff <0f> 0b 31 c0 e9 03 fb ff ff 49 89 f4 48 89 f7 e9 78 f9 ff ff
> > 8b 15
> > [ 634.291630] RSP: 0018:ffff9f0c80a5bd18 EFLAGS: 00010246
> > [ 634.296856] RAX: 000000000000003d RBX: 0000000000000000 RCX: 0000000000000000
> > [ 634.303987] RDX: 000000000000003d RSI: 0000000000000000 RDI: ffff90db906583ec
> > [ 634.311111] RBP: ffff9f0c80a5bde8 R08: 000000000000000a R09: 000000000000003b
> > [ 634.318236] R10: ffff90db92610000 R11: 0000000000000246 R12: ffff90db906583ec
> > [ 634.325368] R13: ffffffffbe87cbc0 R14: 0000000000000000 R15: 0000000000000004
> > [ 634.332500] FS: 00007fd37249a740(0000) GS:ffff90dbefa00000(0000)
> > knlGS:0000000000000000
> > [ 634.340578] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > [ 634.346315] CR2: 0000000000e6d00c CR3: 000000026a4b8004 CR4: 00000000003706f0
> > [ 634.353446] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> > [ 634.360570] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> > [ 634.367693] Call Trace:
> > [ 634.370139] ? lock_acquire+0xa6/0x390
> > [ 634.373892] ? __might_fault+0x34/0x80
> > [ 634.377648] ddebug_exec_queries+0x6e/0x140
> > [ 634.381831] ddebug_proc_write+0x4b/0xa0
> > [ 634.385756] full_proxy_write+0x5f/0x90
> > [ 634.389595] vfs_write+0xed/0x240
> > [ 634.392915] ksys_write+0xad/0xf0
> > [ 634.396233] ? syscall_trace_enter+0x17a/0x240
> > [ 634.400670] __x64_sys_write+0x1a/0x20
> > [ 634.404416] do_syscall_64+0x37/0x50
> > [ 634.407993] entry_SYSCALL_64_after_hwframe+0x44/0xa9
> > [ 634.413038] RIP: 0033:0x7fd371b84144
> > [ 634.416617] Code: 89 02 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00
> > 00 00 00 00 66 90 48 8d 05 c1 e7 2c 00 8b 00 85 c0 75 13 b8 01 00 00
> > 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 41 54 49 89 d4 55 48 89
> > f5 53
> > [ 634.435362] RSP: 002b:00007ffd19447658 EFLAGS: 00000246 ORIG_RAX:
> > 0000000000000001
> > [ 634.442928] RAX: ffffffffffffffda RBX: 00000000000000bc RCX: 00007fd371b84144
> > [ 634.450059] RDX: 00000000000000bc RSI: 0000000000e6cf70 RDI: 0000000000000001
> > [ 634.457181] RBP: 0000000000e6cf70 R08: 00000000000000e9 R09: 0000000000000000
> > [ 634.464305] R10: 00007ffd19447c48 R11: 0000000000000246 R12: 00007fd371e4e760
> > [ 634.471429] R13: 00000000000000bc R14: 00007fd371e49760 R15: 00000000000000bc
> > [ 634.478559] Modules linked in: trace_printk sch_fq 8021q
> > iptable_filter xt_mark ip_tables cls_bpf sch_ingress veth algif_hash
> > x86_pkg_temp_thermal fuse [last unloaded: test_klp_atomic_replace]
> > [ 634.495695] ---[ end trace d04d7e11bd1458bf ]---
> > [ 634.500333] RIP: 0010:ddebug_exec_query+0x77b/0xb90
> > [ 634.505218] Code: 4c 89 ad 70 ff ff ff e9 db fb ff ff b8 03 00 00
> > 00 e9 20 fb ff ff b8 02 00 00 00 e9 16 fb ff ff b8 01 00 00 00 e9 0c
> > fb ff ff <0f> 0b 31 c0 e9 03 fb ff ff 49 89 f4 48 89 f7 e9 78 f9 ff ff
> > 8b 15
> > [ 634.523969] RSP: 0018:ffff9f0c80a5bd18 EFLAGS: 00010246
> > [ 634.529197] RAX: 000000000000003d RBX: 0000000000000000 RCX: 0000000000000000
> > [ 634.536330] RDX: 000000000000003d RSI: 0000000000000000 RDI: ffff90db906583ec
> > [ 634.543462] RBP: ffff9f0c80a5bde8 R08: 000000000000000a R09: 000000000000003b
> > [ 634.550593] R10: ffff90db92610000 R11: 0000000000000246 R12: ffff90db906583ec
> > [ 634.557727] R13: ffffffffbe87cbc0 R14: 0000000000000000 R15: 0000000000000004
> > [ 634.564869] FS: 00007fd37249a740(0000) GS:ffff90dbefa00000(0000)
> > knlGS:0000000000000000
> > [ 634.572953] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > [ 634.578699] CR2: 0000000000e6d00c CR3: 000000026a4b8004 CR4: 00000000003706f0
> > [ 634.585829] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> > [ 634.592964] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
It is caused by the commit 42f07816ac0cc79792811 ("dyndbg:
fix problem parsing format="foo bar"). It modified the condition
when the above BUG() gets triggered.
It has even been reported by the kernel test robot, see
https://lore.kernel.org/lkml/20200902074124.GP4299@shao2-debian/
It is triggered when the livepatching selftest is trying to restore the
original setting of dynamic debug messages in the livepatch framework.
It can get reliably reproduced by the following call:
$> echo -n 'file kernel/livepatch/transition.c line 586 =_' > \
/sys/kernel/debug/dynamic_debug/control
Adding people from the problematic patch into CC.
I haven't dived into the dynamic debug code yet. The logic might
be wrong.
Anyway, the BUG_ON() should get replaced by a normal error message.
There is no reason to panic() when a string can't be parsed !!!
Best Regards,
Petr
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: kernel BUG at /usr/src/kernel/lib/dynamic_debug.c:267!
2020-09-09 8:00 ` Petr Mladek
@ 2020-09-09 12:25 ` Greg Kroah-Hartman
2020-09-09 17:44 ` jim.cromie
0 siblings, 1 reply; 8+ messages in thread
From: Greg Kroah-Hartman @ 2020-09-09 12:25 UTC (permalink / raw)
To: Jim Cromie, Petr Mladek
Cc: Masami Hiramatsu, Naresh Kamboju, Linux-Next Mailing List,
open list, lkft-triage, jbaron, Steven Rostedt, Ingo Molnar,
jim.cromie, Joe Lawrence, Josh Poimboeuf, Jiri Kosina,
Miroslav Benes
On Wed, Sep 09, 2020 at 10:00:25AM +0200, Petr Mladek wrote:
> On Wed 2020-09-09 14:47:45, Masami Hiramatsu wrote:
> > Hi Naresh,
> >
> > Thanks for reporting, it seems that you have run the kselftests/livepatch/test-livepatch.sh.
> > Then, I think it is better to report to Livepatch maintainers too. (I Cc'd them)
> >
> > Thank you,
> >
> > On Wed, 9 Sep 2020 10:24:09 +0530
> > Naresh Kamboju <naresh.kamboju@linaro.org> wrote:
> >
> > > While testing livepatch test cases on x86_64 with Linux next 20200908 tag kernel
> > > this kernel BUG noticed several times.
> > >
> > > metadata:
> > > git branch: master
> > > git repo: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
> > > git commit: dff9f829e5b0181d4ed9d35aa62d695292399b54
> > > git describe: next-20200908
> > > kernel-config:
> > > http://snapshots.linaro.org/openembedded/lkft/lkft/sumo/intel-corei7-64/lkft/linux-next/853/config
> > >
> > > kernel BUG log,
> > > ----------------------
> > > [ 634.063970] % rmmod test_klp_livepatch
> > > [ 634.114787] test_klp_atomic_replace: this has been live patched
> > > [ 634.121953] % echo 0 > /sys/kernel/livepatch/test_klp_atomic_replace/enabled
> > > [ 634.129391] livepatch: 'test_klp_atomic_replace': starting
> > > unpatching transition
> > > [ 634.143990] livepatch: 'test_klp_atomic_replace': unpatching complete
> > > [ 634.156223] % rmmod test_klp_atomic_replace
> > > [ 634.235451] ------------[ cut here ]------------
> > > [ 634.240314] kernel BUG at /usr/src/kernel/lib/dynamic_debug.c:267!
> > > [ 634.246584] invalid opcode: 0000 [#1] SMP PTI
> > > [ 634.250955] CPU: 0 PID: 12791 Comm: test-livepatch. Tainted: G
> > > W K 5.9.0-rc4-next-20200908 #1
> > > [ 634.260615] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS
> > > 2.2 05/23/2018
> > > [ 634.268007] RIP: 0010:ddebug_exec_query+0x77b/0xb90
> > > [ 634.272886] Code: 4c 89 ad 70 ff ff ff e9 db fb ff ff b8 03 00 00
> > > 00 e9 20 fb ff ff b8 02 00 00 00 e9 16 fb ff ff b8 01 00 00 00 e9 0c
> > > fb ff ff <0f> 0b 31 c0 e9 03 fb ff ff 49 89 f4 48 89 f7 e9 78 f9 ff ff
> > > 8b 15
> > > [ 634.291630] RSP: 0018:ffff9f0c80a5bd18 EFLAGS: 00010246
> > > [ 634.296856] RAX: 000000000000003d RBX: 0000000000000000 RCX: 0000000000000000
> > > [ 634.303987] RDX: 000000000000003d RSI: 0000000000000000 RDI: ffff90db906583ec
> > > [ 634.311111] RBP: ffff9f0c80a5bde8 R08: 000000000000000a R09: 000000000000003b
> > > [ 634.318236] R10: ffff90db92610000 R11: 0000000000000246 R12: ffff90db906583ec
> > > [ 634.325368] R13: ffffffffbe87cbc0 R14: 0000000000000000 R15: 0000000000000004
> > > [ 634.332500] FS: 00007fd37249a740(0000) GS:ffff90dbefa00000(0000)
> > > knlGS:0000000000000000
> > > [ 634.340578] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > > [ 634.346315] CR2: 0000000000e6d00c CR3: 000000026a4b8004 CR4: 00000000003706f0
> > > [ 634.353446] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> > > [ 634.360570] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> > > [ 634.367693] Call Trace:
> > > [ 634.370139] ? lock_acquire+0xa6/0x390
> > > [ 634.373892] ? __might_fault+0x34/0x80
> > > [ 634.377648] ddebug_exec_queries+0x6e/0x140
> > > [ 634.381831] ddebug_proc_write+0x4b/0xa0
> > > [ 634.385756] full_proxy_write+0x5f/0x90
> > > [ 634.389595] vfs_write+0xed/0x240
> > > [ 634.392915] ksys_write+0xad/0xf0
> > > [ 634.396233] ? syscall_trace_enter+0x17a/0x240
> > > [ 634.400670] __x64_sys_write+0x1a/0x20
> > > [ 634.404416] do_syscall_64+0x37/0x50
> > > [ 634.407993] entry_SYSCALL_64_after_hwframe+0x44/0xa9
> > > [ 634.413038] RIP: 0033:0x7fd371b84144
> > > [ 634.416617] Code: 89 02 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00
> > > 00 00 00 00 66 90 48 8d 05 c1 e7 2c 00 8b 00 85 c0 75 13 b8 01 00 00
> > > 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 41 54 49 89 d4 55 48 89
> > > f5 53
> > > [ 634.435362] RSP: 002b:00007ffd19447658 EFLAGS: 00000246 ORIG_RAX:
> > > 0000000000000001
> > > [ 634.442928] RAX: ffffffffffffffda RBX: 00000000000000bc RCX: 00007fd371b84144
> > > [ 634.450059] RDX: 00000000000000bc RSI: 0000000000e6cf70 RDI: 0000000000000001
> > > [ 634.457181] RBP: 0000000000e6cf70 R08: 00000000000000e9 R09: 0000000000000000
> > > [ 634.464305] R10: 00007ffd19447c48 R11: 0000000000000246 R12: 00007fd371e4e760
> > > [ 634.471429] R13: 00000000000000bc R14: 00007fd371e49760 R15: 00000000000000bc
> > > [ 634.478559] Modules linked in: trace_printk sch_fq 8021q
> > > iptable_filter xt_mark ip_tables cls_bpf sch_ingress veth algif_hash
> > > x86_pkg_temp_thermal fuse [last unloaded: test_klp_atomic_replace]
> > > [ 634.495695] ---[ end trace d04d7e11bd1458bf ]---
> > > [ 634.500333] RIP: 0010:ddebug_exec_query+0x77b/0xb90
> > > [ 634.505218] Code: 4c 89 ad 70 ff ff ff e9 db fb ff ff b8 03 00 00
> > > 00 e9 20 fb ff ff b8 02 00 00 00 e9 16 fb ff ff b8 01 00 00 00 e9 0c
> > > fb ff ff <0f> 0b 31 c0 e9 03 fb ff ff 49 89 f4 48 89 f7 e9 78 f9 ff ff
> > > 8b 15
> > > [ 634.523969] RSP: 0018:ffff9f0c80a5bd18 EFLAGS: 00010246
> > > [ 634.529197] RAX: 000000000000003d RBX: 0000000000000000 RCX: 0000000000000000
> > > [ 634.536330] RDX: 000000000000003d RSI: 0000000000000000 RDI: ffff90db906583ec
> > > [ 634.543462] RBP: ffff9f0c80a5bde8 R08: 000000000000000a R09: 000000000000003b
> > > [ 634.550593] R10: ffff90db92610000 R11: 0000000000000246 R12: ffff90db906583ec
> > > [ 634.557727] R13: ffffffffbe87cbc0 R14: 0000000000000000 R15: 0000000000000004
> > > [ 634.564869] FS: 00007fd37249a740(0000) GS:ffff90dbefa00000(0000)
> > > knlGS:0000000000000000
> > > [ 634.572953] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > > [ 634.578699] CR2: 0000000000e6d00c CR3: 000000026a4b8004 CR4: 00000000003706f0
> > > [ 634.585829] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> > > [ 634.592964] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>
> It is caused by the commit 42f07816ac0cc79792811 ("dyndbg:
> fix problem parsing format="foo bar"). It modified the condition
> when the above BUG() gets triggered.
>
> It has even been reported by the kernel test robot, see
> https://lore.kernel.org/lkml/20200902074124.GP4299@shao2-debian/
>
>
> It is triggered when the livepatching selftest is trying to restore the
> original setting of dynamic debug messages in the livepatch framework.
>
> It can get reliably reproduced by the following call:
>
> $> echo -n 'file kernel/livepatch/transition.c line 586 =_' > \
> /sys/kernel/debug/dynamic_debug/control
>
>
> Adding people from the problematic patch into CC.
>
> I haven't dived into the dynamic debug code yet. The logic might
> be wrong.
>
> Anyway, the BUG_ON() should get replaced by a normal error message.
> There is no reason to panic() when a string can't be parsed !!!
The above mentioned patch was trying to fix things so that the BUG_ON()
would not be hit, I guess that's not really happening here :(
Jim, can you look into this?
thanks,
greg k-h
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: kernel BUG at /usr/src/kernel/lib/dynamic_debug.c:267!
2020-09-09 12:25 ` Greg Kroah-Hartman
@ 2020-09-09 17:44 ` jim.cromie
2020-09-09 18:12 ` Greg Kroah-Hartman
0 siblings, 1 reply; 8+ messages in thread
From: jim.cromie @ 2020-09-09 17:44 UTC (permalink / raw)
To: Greg Kroah-Hartman
Cc: Petr Mladek, Masami Hiramatsu, Naresh Kamboju,
Linux-Next Mailing List, open list, lkft-triage, Jason Baron,
Steven Rostedt, Ingo Molnar, Joe Lawrence, Josh Poimboeuf,
Jiri Kosina, Miroslav Benes
On Wed, Sep 9, 2020 at 6:24 AM Greg Kroah-Hartman
<gregkh@linuxfoundation.org> wrote:
>
> On Wed, Sep 09, 2020 at 10:00:25AM +0200, Petr Mladek wrote:
> > On Wed 2020-09-09 14:47:45, Masami Hiramatsu wrote:
> > > Hi Naresh,
> > >
> > > Thanks for reporting, it seems that you have run the kselftests/livepatch/test-livepatch.sh.
> > > Then, I think it is better to report to Livepatch maintainers too. (I Cc'd them)
> > >
> > > Thank you,
> > >
> > > On Wed, 9 Sep 2020 10:24:09 +0530
> > > Naresh Kamboju <naresh.kamboju@linaro.org> wrote:
> > >
> > > > While testing livepatch test cases on x86_64 with Linux next 20200908 tag kernel
> > > > this kernel BUG noticed several times.
> > > >
> > > > metadata:
> > > > git branch: master
> > > > git repo: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
> > > > git commit: dff9f829e5b0181d4ed9d35aa62d695292399b54
> > > > git describe: next-20200908
> > > > kernel-config:
> > > > http://snapshots.linaro.org/openembedded/lkft/lkft/sumo/intel-corei7-64/lkft/linux-next/853/config
> > > >
> > > > kernel BUG log,
> > > > ----------------------
> > > > [ 634.063970] % rmmod test_klp_livepatch
> > > > [ 634.114787] test_klp_atomic_replace: this has been live patched
> > > > [ 634.121953] % echo 0 > /sys/kernel/livepatch/test_klp_atomic_replace/enabled
> > > > [ 634.129391] livepatch: 'test_klp_atomic_replace': starting
> > > > unpatching transition
> > > > [ 634.143990] livepatch: 'test_klp_atomic_replace': unpatching complete
> > > > [ 634.156223] % rmmod test_klp_atomic_replace
> > > > [ 634.235451] ------------[ cut here ]------------
> > > > [ 634.240314] kernel BUG at /usr/src/kernel/lib/dynamic_debug.c:267!
> > > > [ 634.246584] invalid opcode: 0000 [#1] SMP PTI
> > > > [ 634.250955] CPU: 0 PID: 12791 Comm: test-livepatch. Tainted: G
> > > > W K 5.9.0-rc4-next-20200908 #1
> > > > [ 634.260615] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS
> > > > 2.2 05/23/2018
> > > > [ 634.268007] RIP: 0010:ddebug_exec_query+0x77b/0xb90
> > > > [ 634.272886] Code: 4c 89 ad 70 ff ff ff e9 db fb ff ff b8 03 00 00
> > > > 00 e9 20 fb ff ff b8 02 00 00 00 e9 16 fb ff ff b8 01 00 00 00 e9 0c
> > > > fb ff ff <0f> 0b 31 c0 e9 03 fb ff ff 49 89 f4 48 89 f7 e9 78 f9 ff ff
> > > > 8b 15
> > > > [ 634.291630] RSP: 0018:ffff9f0c80a5bd18 EFLAGS: 00010246
> > > > [ 634.296856] RAX: 000000000000003d RBX: 0000000000000000 RCX: 0000000000000000
> > > > [ 634.303987] RDX: 000000000000003d RSI: 0000000000000000 RDI: ffff90db906583ec
> > > > [ 634.311111] RBP: ffff9f0c80a5bde8 R08: 000000000000000a R09: 000000000000003b
> > > > [ 634.318236] R10: ffff90db92610000 R11: 0000000000000246 R12: ffff90db906583ec
> > > > [ 634.325368] R13: ffffffffbe87cbc0 R14: 0000000000000000 R15: 0000000000000004
> > > > [ 634.332500] FS: 00007fd37249a740(0000) GS:ffff90dbefa00000(0000)
> > > > knlGS:0000000000000000
> > > > [ 634.340578] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > > > [ 634.346315] CR2: 0000000000e6d00c CR3: 000000026a4b8004 CR4: 00000000003706f0
> > > > [ 634.353446] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> > > > [ 634.360570] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> > > > [ 634.367693] Call Trace:
> > > > [ 634.370139] ? lock_acquire+0xa6/0x390
> > > > [ 634.373892] ? __might_fault+0x34/0x80
> > > > [ 634.377648] ddebug_exec_queries+0x6e/0x140
> > > > [ 634.381831] ddebug_proc_write+0x4b/0xa0
> > > > [ 634.385756] full_proxy_write+0x5f/0x90
> > > > [ 634.389595] vfs_write+0xed/0x240
> > > > [ 634.392915] ksys_write+0xad/0xf0
> > > > [ 634.396233] ? syscall_trace_enter+0x17a/0x240
> > > > [ 634.400670] __x64_sys_write+0x1a/0x20
> > > > [ 634.404416] do_syscall_64+0x37/0x50
> > > > [ 634.407993] entry_SYSCALL_64_after_hwframe+0x44/0xa9
> > > > [ 634.413038] RIP: 0033:0x7fd371b84144
> > > > [ 634.416617] Code: 89 02 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00
> > > > 00 00 00 00 66 90 48 8d 05 c1 e7 2c 00 8b 00 85 c0 75 13 b8 01 00 00
> > > > 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 41 54 49 89 d4 55 48 89
> > > > f5 53
> > > > [ 634.435362] RSP: 002b:00007ffd19447658 EFLAGS: 00000246 ORIG_RAX:
> > > > 0000000000000001
> > > > [ 634.442928] RAX: ffffffffffffffda RBX: 00000000000000bc RCX: 00007fd371b84144
> > > > [ 634.450059] RDX: 00000000000000bc RSI: 0000000000e6cf70 RDI: 0000000000000001
> > > > [ 634.457181] RBP: 0000000000e6cf70 R08: 00000000000000e9 R09: 0000000000000000
> > > > [ 634.464305] R10: 00007ffd19447c48 R11: 0000000000000246 R12: 00007fd371e4e760
> > > > [ 634.471429] R13: 00000000000000bc R14: 00007fd371e49760 R15: 00000000000000bc
> > > > [ 634.478559] Modules linked in: trace_printk sch_fq 8021q
> > > > iptable_filter xt_mark ip_tables cls_bpf sch_ingress veth algif_hash
> > > > x86_pkg_temp_thermal fuse [last unloaded: test_klp_atomic_replace]
> > > > [ 634.495695] ---[ end trace d04d7e11bd1458bf ]---
> > > > [ 634.500333] RIP: 0010:ddebug_exec_query+0x77b/0xb90
> > > > [ 634.505218] Code: 4c 89 ad 70 ff ff ff e9 db fb ff ff b8 03 00 00
> > > > 00 e9 20 fb ff ff b8 02 00 00 00 e9 16 fb ff ff b8 01 00 00 00 e9 0c
> > > > fb ff ff <0f> 0b 31 c0 e9 03 fb ff ff 49 89 f4 48 89 f7 e9 78 f9 ff ff
> > > > 8b 15
> > > > [ 634.523969] RSP: 0018:ffff9f0c80a5bd18 EFLAGS: 00010246
> > > > [ 634.529197] RAX: 000000000000003d RBX: 0000000000000000 RCX: 0000000000000000
> > > > [ 634.536330] RDX: 000000000000003d RSI: 0000000000000000 RDI: ffff90db906583ec
> > > > [ 634.543462] RBP: ffff9f0c80a5bde8 R08: 000000000000000a R09: 000000000000003b
> > > > [ 634.550593] R10: ffff90db92610000 R11: 0000000000000246 R12: ffff90db906583ec
> > > > [ 634.557727] R13: ffffffffbe87cbc0 R14: 0000000000000000 R15: 0000000000000004
> > > > [ 634.564869] FS: 00007fd37249a740(0000) GS:ffff90dbefa00000(0000)
> > > > knlGS:0000000000000000
> > > > [ 634.572953] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > > > [ 634.578699] CR2: 0000000000e6d00c CR3: 000000026a4b8004 CR4: 00000000003706f0
> > > > [ 634.585829] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> > > > [ 634.592964] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> >
> > It is caused by the commit 42f07816ac0cc79792811 ("dyndbg:
> > fix problem parsing format="foo bar"). It modified the condition
> > when the above BUG() gets triggered.
> >
> > It has even been reported by the kernel test robot, see
> > https://lore.kernel.org/lkml/20200902074124.GP4299@shao2-debian/
> >
> >
> > It is triggered when the livepatching selftest is trying to restore the
> > original setting of dynamic debug messages in the livepatch framework.
> >
> > It can get reliably reproduced by the following call:
> >
> > $> echo -n 'file kernel/livepatch/transition.c line 586 =_' > \
> > /sys/kernel/debug/dynamic_debug/control
> >
> >
> > Adding people from the problematic patch into CC.
> >
> > I haven't dived into the dynamic debug code yet. The logic might
> > be wrong.
> >
> > Anyway, the BUG_ON() should get replaced by a normal error message.
> > There is no reason to panic() when a string can't be parsed !!!
>
> The above mentioned patch was trying to fix things so that the BUG_ON()
> would not be hit, I guess that's not really happening here :(
>
> Jim, can you look into this?
>
> thanks,
>
> greg k-h
Ive been down with a stomach bug for past week,
Im feeling normal-ish now, but playing catchup, and taking some NMIs.
commit 42f07816ac0cc79792811 ("dyndbg: fix problem parsing format="foo bar").
I'm miffed and embarrassed that the quick fix also broke.
Im not experienced enough to know what "normal" handling looks like
for reactive breakages like this...
If you want to revert the 2 commits (original feature + fixup),
Id find some stress relief in that, and would take a clean run at it later.
I hope to steal a few hrs from the catchup tasks to investigate this RSN.
thanks and apologies
Jim
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: kernel BUG at /usr/src/kernel/lib/dynamic_debug.c:267!
2020-09-09 17:44 ` jim.cromie
@ 2020-09-09 18:12 ` Greg Kroah-Hartman
2020-09-09 22:23 ` Stephen Rothwell
0 siblings, 1 reply; 8+ messages in thread
From: Greg Kroah-Hartman @ 2020-09-09 18:12 UTC (permalink / raw)
To: jim.cromie
Cc: Petr Mladek, Masami Hiramatsu, Naresh Kamboju,
Linux-Next Mailing List, open list, lkft-triage, Jason Baron,
Steven Rostedt, Ingo Molnar, Joe Lawrence, Josh Poimboeuf,
Jiri Kosina, Miroslav Benes
On Wed, Sep 09, 2020 at 11:44:44AM -0600, jim.cromie@gmail.com wrote:
> On Wed, Sep 9, 2020 at 6:24 AM Greg Kroah-Hartman
> <gregkh@linuxfoundation.org> wrote:
> >
> > On Wed, Sep 09, 2020 at 10:00:25AM +0200, Petr Mladek wrote:
> > > On Wed 2020-09-09 14:47:45, Masami Hiramatsu wrote:
> > > > Hi Naresh,
> > > >
> > > > Thanks for reporting, it seems that you have run the kselftests/livepatch/test-livepatch.sh.
> > > > Then, I think it is better to report to Livepatch maintainers too. (I Cc'd them)
> > > >
> > > > Thank you,
> > > >
> > > > On Wed, 9 Sep 2020 10:24:09 +0530
> > > > Naresh Kamboju <naresh.kamboju@linaro.org> wrote:
> > > >
> > > > > While testing livepatch test cases on x86_64 with Linux next 20200908 tag kernel
> > > > > this kernel BUG noticed several times.
> > > > >
> > > > > metadata:
> > > > > git branch: master
> > > > > git repo: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
> > > > > git commit: dff9f829e5b0181d4ed9d35aa62d695292399b54
> > > > > git describe: next-20200908
> > > > > kernel-config:
> > > > > http://snapshots.linaro.org/openembedded/lkft/lkft/sumo/intel-corei7-64/lkft/linux-next/853/config
> > > > >
> > > > > kernel BUG log,
> > > > > ----------------------
> > > > > [ 634.063970] % rmmod test_klp_livepatch
> > > > > [ 634.114787] test_klp_atomic_replace: this has been live patched
> > > > > [ 634.121953] % echo 0 > /sys/kernel/livepatch/test_klp_atomic_replace/enabled
> > > > > [ 634.129391] livepatch: 'test_klp_atomic_replace': starting
> > > > > unpatching transition
> > > > > [ 634.143990] livepatch: 'test_klp_atomic_replace': unpatching complete
> > > > > [ 634.156223] % rmmod test_klp_atomic_replace
> > > > > [ 634.235451] ------------[ cut here ]------------
> > > > > [ 634.240314] kernel BUG at /usr/src/kernel/lib/dynamic_debug.c:267!
> > > > > [ 634.246584] invalid opcode: 0000 [#1] SMP PTI
> > > > > [ 634.250955] CPU: 0 PID: 12791 Comm: test-livepatch. Tainted: G
> > > > > W K 5.9.0-rc4-next-20200908 #1
> > > > > [ 634.260615] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS
> > > > > 2.2 05/23/2018
> > > > > [ 634.268007] RIP: 0010:ddebug_exec_query+0x77b/0xb90
> > > > > [ 634.272886] Code: 4c 89 ad 70 ff ff ff e9 db fb ff ff b8 03 00 00
> > > > > 00 e9 20 fb ff ff b8 02 00 00 00 e9 16 fb ff ff b8 01 00 00 00 e9 0c
> > > > > fb ff ff <0f> 0b 31 c0 e9 03 fb ff ff 49 89 f4 48 89 f7 e9 78 f9 ff ff
> > > > > 8b 15
> > > > > [ 634.291630] RSP: 0018:ffff9f0c80a5bd18 EFLAGS: 00010246
> > > > > [ 634.296856] RAX: 000000000000003d RBX: 0000000000000000 RCX: 0000000000000000
> > > > > [ 634.303987] RDX: 000000000000003d RSI: 0000000000000000 RDI: ffff90db906583ec
> > > > > [ 634.311111] RBP: ffff9f0c80a5bde8 R08: 000000000000000a R09: 000000000000003b
> > > > > [ 634.318236] R10: ffff90db92610000 R11: 0000000000000246 R12: ffff90db906583ec
> > > > > [ 634.325368] R13: ffffffffbe87cbc0 R14: 0000000000000000 R15: 0000000000000004
> > > > > [ 634.332500] FS: 00007fd37249a740(0000) GS:ffff90dbefa00000(0000)
> > > > > knlGS:0000000000000000
> > > > > [ 634.340578] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > > > > [ 634.346315] CR2: 0000000000e6d00c CR3: 000000026a4b8004 CR4: 00000000003706f0
> > > > > [ 634.353446] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> > > > > [ 634.360570] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> > > > > [ 634.367693] Call Trace:
> > > > > [ 634.370139] ? lock_acquire+0xa6/0x390
> > > > > [ 634.373892] ? __might_fault+0x34/0x80
> > > > > [ 634.377648] ddebug_exec_queries+0x6e/0x140
> > > > > [ 634.381831] ddebug_proc_write+0x4b/0xa0
> > > > > [ 634.385756] full_proxy_write+0x5f/0x90
> > > > > [ 634.389595] vfs_write+0xed/0x240
> > > > > [ 634.392915] ksys_write+0xad/0xf0
> > > > > [ 634.396233] ? syscall_trace_enter+0x17a/0x240
> > > > > [ 634.400670] __x64_sys_write+0x1a/0x20
> > > > > [ 634.404416] do_syscall_64+0x37/0x50
> > > > > [ 634.407993] entry_SYSCALL_64_after_hwframe+0x44/0xa9
> > > > > [ 634.413038] RIP: 0033:0x7fd371b84144
> > > > > [ 634.416617] Code: 89 02 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00
> > > > > 00 00 00 00 66 90 48 8d 05 c1 e7 2c 00 8b 00 85 c0 75 13 b8 01 00 00
> > > > > 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 41 54 49 89 d4 55 48 89
> > > > > f5 53
> > > > > [ 634.435362] RSP: 002b:00007ffd19447658 EFLAGS: 00000246 ORIG_RAX:
> > > > > 0000000000000001
> > > > > [ 634.442928] RAX: ffffffffffffffda RBX: 00000000000000bc RCX: 00007fd371b84144
> > > > > [ 634.450059] RDX: 00000000000000bc RSI: 0000000000e6cf70 RDI: 0000000000000001
> > > > > [ 634.457181] RBP: 0000000000e6cf70 R08: 00000000000000e9 R09: 0000000000000000
> > > > > [ 634.464305] R10: 00007ffd19447c48 R11: 0000000000000246 R12: 00007fd371e4e760
> > > > > [ 634.471429] R13: 00000000000000bc R14: 00007fd371e49760 R15: 00000000000000bc
> > > > > [ 634.478559] Modules linked in: trace_printk sch_fq 8021q
> > > > > iptable_filter xt_mark ip_tables cls_bpf sch_ingress veth algif_hash
> > > > > x86_pkg_temp_thermal fuse [last unloaded: test_klp_atomic_replace]
> > > > > [ 634.495695] ---[ end trace d04d7e11bd1458bf ]---
> > > > > [ 634.500333] RIP: 0010:ddebug_exec_query+0x77b/0xb90
> > > > > [ 634.505218] Code: 4c 89 ad 70 ff ff ff e9 db fb ff ff b8 03 00 00
> > > > > 00 e9 20 fb ff ff b8 02 00 00 00 e9 16 fb ff ff b8 01 00 00 00 e9 0c
> > > > > fb ff ff <0f> 0b 31 c0 e9 03 fb ff ff 49 89 f4 48 89 f7 e9 78 f9 ff ff
> > > > > 8b 15
> > > > > [ 634.523969] RSP: 0018:ffff9f0c80a5bd18 EFLAGS: 00010246
> > > > > [ 634.529197] RAX: 000000000000003d RBX: 0000000000000000 RCX: 0000000000000000
> > > > > [ 634.536330] RDX: 000000000000003d RSI: 0000000000000000 RDI: ffff90db906583ec
> > > > > [ 634.543462] RBP: ffff9f0c80a5bde8 R08: 000000000000000a R09: 000000000000003b
> > > > > [ 634.550593] R10: ffff90db92610000 R11: 0000000000000246 R12: ffff90db906583ec
> > > > > [ 634.557727] R13: ffffffffbe87cbc0 R14: 0000000000000000 R15: 0000000000000004
> > > > > [ 634.564869] FS: 00007fd37249a740(0000) GS:ffff90dbefa00000(0000)
> > > > > knlGS:0000000000000000
> > > > > [ 634.572953] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > > > > [ 634.578699] CR2: 0000000000e6d00c CR3: 000000026a4b8004 CR4: 00000000003706f0
> > > > > [ 634.585829] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> > > > > [ 634.592964] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> > >
> > > It is caused by the commit 42f07816ac0cc79792811 ("dyndbg:
> > > fix problem parsing format="foo bar"). It modified the condition
> > > when the above BUG() gets triggered.
> > >
> > > It has even been reported by the kernel test robot, see
> > > https://lore.kernel.org/lkml/20200902074124.GP4299@shao2-debian/
> > >
> > >
> > > It is triggered when the livepatching selftest is trying to restore the
> > > original setting of dynamic debug messages in the livepatch framework.
> > >
> > > It can get reliably reproduced by the following call:
> > >
> > > $> echo -n 'file kernel/livepatch/transition.c line 586 =_' > \
> > > /sys/kernel/debug/dynamic_debug/control
> > >
> > >
> > > Adding people from the problematic patch into CC.
> > >
> > > I haven't dived into the dynamic debug code yet. The logic might
> > > be wrong.
> > >
> > > Anyway, the BUG_ON() should get replaced by a normal error message.
> > > There is no reason to panic() when a string can't be parsed !!!
> >
> > The above mentioned patch was trying to fix things so that the BUG_ON()
> > would not be hit, I guess that's not really happening here :(
> >
> > Jim, can you look into this?
> >
> > thanks,
> >
> > greg k-h
>
> Ive been down with a stomach bug for past week,
> Im feeling normal-ish now, but playing catchup, and taking some NMIs.
>
>
> commit 42f07816ac0cc79792811 ("dyndbg: fix problem parsing format="foo bar").
>
> I'm miffed and embarrassed that the quick fix also broke.
> Im not experienced enough to know what "normal" handling looks like
> for reactive breakages like this...
>
> If you want to revert the 2 commits (original feature + fixup),
> Id find some stress relief in that, and would take a clean run at it later.
>
> I hope to steal a few hrs from the catchup tasks to investigate this RSN.
>
> thanks and apologies
No worries, go rest and get better, that's more important than this
little stuff.
I'll go revert both patches from my tree in the morning, which should
clear these issues up.
thanks,
greg k-h
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: kernel BUG at /usr/src/kernel/lib/dynamic_debug.c:267!
2020-09-09 18:12 ` Greg Kroah-Hartman
@ 2020-09-09 22:23 ` Stephen Rothwell
2020-09-10 16:46 ` Greg Kroah-Hartman
0 siblings, 1 reply; 8+ messages in thread
From: Stephen Rothwell @ 2020-09-09 22:23 UTC (permalink / raw)
To: Greg Kroah-Hartman
Cc: jim.cromie, Petr Mladek, Masami Hiramatsu, Naresh Kamboju,
Linux-Next Mailing List, open list, lkft-triage, Jason Baron,
Steven Rostedt, Ingo Molnar, Joe Lawrence, Josh Poimboeuf,
Jiri Kosina, Miroslav Benes
[-- Attachment #1: Type: text/plain, Size: 285 bytes --]
Hi Greg,
On Wed, 9 Sep 2020 20:12:51 +0200 Greg Kroah-Hartman <gregkh@linuxfoundation.org> wrote:
>
> I'll go revert both patches from my tree in the morning, which should
> clear these issues up.
I have reverted them from linux-next today.
--
Cheers,
Stephen Rothwell
[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 488 bytes --]
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: kernel BUG at /usr/src/kernel/lib/dynamic_debug.c:267!
2020-09-09 22:23 ` Stephen Rothwell
@ 2020-09-10 16:46 ` Greg Kroah-Hartman
0 siblings, 0 replies; 8+ messages in thread
From: Greg Kroah-Hartman @ 2020-09-10 16:46 UTC (permalink / raw)
To: Stephen Rothwell
Cc: jim.cromie, Petr Mladek, Masami Hiramatsu, Naresh Kamboju,
Linux-Next Mailing List, open list, lkft-triage, Jason Baron,
Steven Rostedt, Ingo Molnar, Joe Lawrence, Josh Poimboeuf,
Jiri Kosina, Miroslav Benes
On Thu, Sep 10, 2020 at 08:23:23AM +1000, Stephen Rothwell wrote:
> Hi Greg,
>
> On Wed, 9 Sep 2020 20:12:51 +0200 Greg Kroah-Hartman <gregkh@linuxfoundation.org> wrote:
> >
> > I'll go revert both patches from my tree in the morning, which should
> > clear these issues up.
>
> I have reverted them from linux-next today.
>
Dropped in my tree now too, thanks.
greg k-h
^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2020-09-10 16:56 UTC | newest]
Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-09-09 4:54 kernel BUG at /usr/src/kernel/lib/dynamic_debug.c:267! Naresh Kamboju
2020-09-09 5:47 ` Masami Hiramatsu
2020-09-09 8:00 ` Petr Mladek
2020-09-09 12:25 ` Greg Kroah-Hartman
2020-09-09 17:44 ` jim.cromie
2020-09-09 18:12 ` Greg Kroah-Hartman
2020-09-09 22:23 ` Stephen Rothwell
2020-09-10 16:46 ` Greg Kroah-Hartman
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