* upstream boot error: general protection fault in do_mount_root
@ 2019-12-16 7:55 syzbot
2019-12-16 17:21 ` Eric Biggers
0 siblings, 1 reply; 2+ messages in thread
From: syzbot @ 2019-12-16 7:55 UTC (permalink / raw)
To: dhowells, linux-kernel, linux, pc, syzkaller-bugs, viro
Hello,
syzbot found the following crash on:
HEAD commit: d1eef1c6 Linux 5.5-rc2
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=11ff2fb1e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=dcf10bf83926432a
dashboard link: https://syzkaller.appspot.com/bug?extid=958915844b296815c246
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+958915844b296815c246@syzkaller.appspotmail.com
IPI shorthand broadcast: enabled
AVX2 version of gcm_enc/dec engaged.
AES CTR mode by8 optimization enabled
registered taskstats version 1
Loading compiled-in X.509 certificates
Loaded X.509 cert 'Build time autogenerated kernel key:
2a1122198a3e68692ac5775a16203e4f5f9d30c2'
zswap: loaded using pool lzo/zbud
Key type ._fscrypt registered
Key type .fscrypt registered
Btrfs loaded, crc32c=crc32c-intel
Key type big_key registered
Key type encrypted registered
ima: No TPM chip found, activating TPM-bypass!
ima: Allocated hash algorithm: sha256
ima: No architecture policies found
evm: Initialising EVM extended attributes:
evm: security.selinux
evm: security.SMACK64
evm: security.SMACK64EXEC
evm: security.SMACK64TRANSMUTE
evm: security.SMACK64MMAP
evm: security.apparmor
evm: security.ima
evm: security.capability
evm: HMAC attrs: 0x1
PM: Magic number: 15:612:306
usb usb38: hash matches
tty tty35: hash matches
printk: console [netcon0] enabled
netconsole: network logging started
gtp: GTP module loaded (pdp ctx size 104 bytes)
rdma_rxe: loaded
cfg80211: Loading compiled-in X.509 certificates for regulatory database
cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
Unstable clock detected, switching default tracing clock to "global"
If you want to keep using the local clock, then add:
"trace_clock=local"
on the kernel command line
ALSA device list:
#0: Dummy 1
#1: Loopback 1
#2: Virtual MIDI Card 1
#3: HDA Intel at 0xfebf0000 irq 31
md: Waiting for all devices to be available before autodetect
md: If you don't use raid, use raid=noautodetect
md: Autodetecting RAID arrays.
md: autorun ...
md: ... autorun DONE.
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 3 PID: 1 Comm: swapper/0 Not tainted 5.5.0-rc2-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS
rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
RIP: 0010:strncpy+0x35/0xc0 lib/string.c:119
Code: e5 41 56 41 55 4c 8d 34 17 49 bd 00 00 00 00 00 fc ff df 41 54 53 48
89 fb 48 83 ec 10 48 89 f2 48 89 f1 48 c1 ea 03 83 e1 07 <42> 0f b6 14 2a
38 ca 7f 04 84 d2 75 40 48 89 da 48 89 d9 44 0f b6
RSP: 0000:ffffc9000034fca8 EFLAGS: 00010246
RAX: ffff88807331f000 RBX: ffff88807331f000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88807331f000
RBP: ffffc9000034fcd8 R08: ffff88807331f000 R09: ffffed1005a6703d
R10: ffffed1005a6703c R11: ffff88802d3381e3 R12: ffffea0001ccc7c0
R13: dffffc0000000000 R14: ffff88807331ffff R15: ffff88801f1cb000
FS: 0000000000000000(0000) GS:ffff88802d300000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000000986d000 CR4: 0000000000340ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
strncpy include/linux/string.h:281 [inline]
do_mount_root+0x74/0x23b init/do_mounts.c:404
mount_block_root+0x342/0x51a init/do_mounts.c:438
mount_root+0x283/0x2cd init/do_mounts.c:628
prepare_namespace+0x26f/0x2a7 init/do_mounts.c:687
kernel_init_freeable+0x557/0x570 init/main.c:1231
kernel_init+0x12/0x1bf init/main.c:1110
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Modules linked in:
---[ end trace dc1d12e4189687e7 ]---
RIP: 0010:strncpy+0x35/0xc0 lib/string.c:119
Code: e5 41 56 41 55 4c 8d 34 17 49 bd 00 00 00 00 00 fc ff df 41 54 53 48
89 fb 48 83 ec 10 48 89 f2 48 89 f1 48 c1 ea 03 83 e1 07 <42> 0f b6 14 2a
38 ca 7f 04 84 d2 75 40 48 89 da 48 89 d9 44 0f b6
RSP: 0000:ffffc9000034fca8 EFLAGS: 00010246
RAX: ffff88807331f000 RBX: ffff88807331f000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88807331f000
RBP: ffffc9000034fcd8 R08: ffff88807331f000 R09: ffffed1005a6703d
R10: ffffed1005a6703c R11: ffff88802d3381e3 R12: ffffea0001ccc7c0
R13: dffffc0000000000 R14: ffff88807331ffff R15: ffff88801f1cb000
FS: 0000000000000000(0000) GS:ffff88802d300000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000000986d000 CR4: 0000000000340ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: upstream boot error: general protection fault in do_mount_root
2019-12-16 7:55 upstream boot error: general protection fault in do_mount_root syzbot
@ 2019-12-16 17:21 ` Eric Biggers
0 siblings, 0 replies; 2+ messages in thread
From: Eric Biggers @ 2019-12-16 17:21 UTC (permalink / raw)
To: syzbot; +Cc: dhowells, linux-kernel, linux, pc, syzkaller-bugs, viro
On Sun, Dec 15, 2019 at 11:55:07PM -0800, syzbot wrote:
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit: d1eef1c6 Linux 5.5-rc2
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=11ff2fb1e00000
> kernel config: https://syzkaller.appspot.com/x/.config?x=dcf10bf83926432a
> dashboard link: https://syzkaller.appspot.com/bug?extid=958915844b296815c246
> compiler: gcc (GCC) 9.0.0 20181231 (experimental)
>
> Unfortunately, I don't have any reproducer for this crash yet.
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+958915844b296815c246@syzkaller.appspotmail.com
>
> IPI shorthand broadcast: enabled
> AVX2 version of gcm_enc/dec engaged.
> AES CTR mode by8 optimization enabled
> registered taskstats version 1
> Loading compiled-in X.509 certificates
> Loaded X.509 cert 'Build time autogenerated kernel key:
> 2a1122198a3e68692ac5775a16203e4f5f9d30c2'
> zswap: loaded using pool lzo/zbud
> Key type ._fscrypt registered
> Key type .fscrypt registered
> Btrfs loaded, crc32c=crc32c-intel
> Key type big_key registered
> Key type encrypted registered
> ima: No TPM chip found, activating TPM-bypass!
> ima: Allocated hash algorithm: sha256
> ima: No architecture policies found
> evm: Initialising EVM extended attributes:
> evm: security.selinux
> evm: security.SMACK64
> evm: security.SMACK64EXEC
> evm: security.SMACK64TRANSMUTE
> evm: security.SMACK64MMAP
> evm: security.apparmor
> evm: security.ima
> evm: security.capability
> evm: HMAC attrs: 0x1
> PM: Magic number: 15:612:306
> usb usb38: hash matches
> tty tty35: hash matches
> printk: console [netcon0] enabled
> netconsole: network logging started
> gtp: GTP module loaded (pdp ctx size 104 bytes)
> rdma_rxe: loaded
> cfg80211: Loading compiled-in X.509 certificates for regulatory database
> cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
> Unstable clock detected, switching default tracing clock to "global"
> If you want to keep using the local clock, then add:
> "trace_clock=local"
> on the kernel command line
> ALSA device list:
> #0: Dummy 1
> #1: Loopback 1
> #2: Virtual MIDI Card 1
> #3: HDA Intel at 0xfebf0000 irq 31
> md: Waiting for all devices to be available before autodetect
> md: If you don't use raid, use raid=noautodetect
> md: Autodetecting RAID arrays.
> md: autorun ...
> md: ... autorun DONE.
> kasan: CONFIG_KASAN_INLINE enabled
> kasan: GPF could be caused by NULL-ptr deref or user memory access
> general protection fault: 0000 [#1] PREEMPT SMP KASAN
> CPU: 3 PID: 1 Comm: swapper/0 Not tainted 5.5.0-rc2-syzkaller #0
> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS
> rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
> RIP: 0010:strncpy+0x35/0xc0 lib/string.c:119
> Code: e5 41 56 41 55 4c 8d 34 17 49 bd 00 00 00 00 00 fc ff df 41 54 53 48
> 89 fb 48 83 ec 10 48 89 f2 48 89 f1 48 c1 ea 03 83 e1 07 <42> 0f b6 14 2a 38
> ca 7f 04 84 d2 75 40 48 89 da 48 89 d9 44 0f b6
> RSP: 0000:ffffc9000034fca8 EFLAGS: 00010246
> RAX: ffff88807331f000 RBX: ffff88807331f000 RCX: 0000000000000000
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88807331f000
> RBP: ffffc9000034fcd8 R08: ffff88807331f000 R09: ffffed1005a6703d
> R10: ffffed1005a6703c R11: ffff88802d3381e3 R12: ffffea0001ccc7c0
> R13: dffffc0000000000 R14: ffff88807331ffff R15: ffff88801f1cb000
> FS: 0000000000000000(0000) GS:ffff88802d300000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000000000000 CR3: 000000000986d000 CR4: 0000000000340ee0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
> strncpy include/linux/string.h:281 [inline]
> do_mount_root+0x74/0x23b init/do_mounts.c:404
> mount_block_root+0x342/0x51a init/do_mounts.c:438
> mount_root+0x283/0x2cd init/do_mounts.c:628
> prepare_namespace+0x26f/0x2a7 init/do_mounts.c:687
> kernel_init_freeable+0x557/0x570 init/main.c:1231
> kernel_init+0x12/0x1bf init/main.c:1110
> ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
> Modules linked in:
> ---[ end trace dc1d12e4189687e7 ]---
> RIP: 0010:strncpy+0x35/0xc0 lib/string.c:119
> Code: e5 41 56 41 55 4c 8d 34 17 49 bd 00 00 00 00 00 fc ff df 41 54 53 48
> 89 fb 48 83 ec 10 48 89 f2 48 89 f1 48 c1 ea 03 83 e1 07 <42> 0f b6 14 2a 38
> ca 7f 04 84 d2 75 40 48 89 da 48 89 d9 44 0f b6
> RSP: 0000:ffffc9000034fca8 EFLAGS: 00010246
> RAX: ffff88807331f000 RBX: ffff88807331f000 RCX: 0000000000000000
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88807331f000
> RBP: ffffc9000034fcd8 R08: ffff88807331f000 R09: ffffed1005a6703d
> R10: ffffed1005a6703c R11: ffff88802d3381e3 R12: ffffea0001ccc7c0
> R13: dffffc0000000000 R14: ffff88807331ffff R15: ffff88801f1cb000
> FS: 0000000000000000(0000) GS:ffff88802d300000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000000000000 CR3: 000000000986d000 CR4: 0000000000340ee0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>
>
Fixed in mainline by commit 7de7de7ca0ae0
#syz fix: Fix root mounting with no mount options
- Eric
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2019-12-16 7:55 upstream boot error: general protection fault in do_mount_root syzbot
2019-12-16 17:21 ` Eric Biggers
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