* WARNING in __put_task_struct (2)
@ 2018-10-08 16:12 syzbot
2018-10-08 16:15 ` Dmitry Vyukov
2018-10-14 17:12 ` syzbot
0 siblings, 2 replies; 6+ messages in thread
From: syzbot @ 2018-10-08 16:12 UTC (permalink / raw)
To: akpm, ebiederm, guro, keescook, kirill.shutemov, linux-kernel,
luto, marcos.souza.org, mhocko, riel, syzkaller-bugs, wad
Hello,
syzbot found the following crash on:
HEAD commit: ae16eea39a86 Add linux-next specific files for 20181008
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=12e7c6a1400000
kernel config: https://syzkaller.appspot.com/x/.config?x=42525ce985d1a955
dashboard link: https://syzkaller.appspot.com/bug?extid=1ed9dfaa984c88cf0ef8
compiler: gcc (GCC) 8.0.1 20180413 (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+1ed9dfaa984c88cf0ef8@syzkaller.appspotmail.com
WARNING: CPU: 1 PID: 16271 at kernel/fork.c:718
__put_task_struct+0x3ef/0x620 kernel/fork.c:718
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 16271 Comm: syz-executor5 Not tainted 4.19.0-rc7-next-20181008+
#89
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x244/0x3ab lib/dump_stack.c:113
panic+0x238/0x4e7 kernel/panic.c:184
__warn.cold.8+0x163/0x1ba kernel/panic.c:536
report_bug+0x254/0x2d0 lib/bug.c:186
fixup_bug arch/x86/kernel/traps.c:178 [inline]
do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271
do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:290
invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:969
RIP: 0010:__put_task_struct+0x3ef/0x620 kernel/fork.c:718
Code: 4c 89 ee e8 d3 9d 7b 00 e9 a1 fe ff ff e8 89 53 37 00 0f 0b e9 7c fd
ff ff e8 7d 53 37 00 0f 0b e9 87 fd ff ff e8 71 53 37 00 <0f> 0b e9 d0 fc
ff ff e8 65 53 37 00 49 8d 87 90 05 00 00 31 f6 48
RSP: 0018:ffff88018dbcf808 EFLAGS: 00010293
RAX: ffff880187474180 RBX: ffff88018cc7a1c0 RCX: ffffffff8147298d
RDX: 0000000000000000 RSI: ffffffff81472cbf RDI: 0000000000000005
RBP: ffff88018dbcf8e8 R08: ffff880187474180 R09: ffffed003198f43c
R10: ffffed003198f43c R11: ffff88018cc7a1e3 R12: 1ffff10031b79f04
R13: 0000000000000000 R14: ffff88018dbcf8c0 R15: ffff88018daceb40
put_task_struct include/linux/sched/task.h:96 [inline]
rdma_restrack_del+0x2e0/0x3b0 drivers/infiniband/core/restrack.c:243
rdma_destroy_id+0x126/0xcc0 drivers/infiniband/core/cma.c:1820
ucma_close+0x114/0x310 drivers/infiniband/core/ucma.c:1767
__fput+0x3bc/0xa70 fs/file_table.c:279
____fput+0x15/0x20 fs/file_table.c:312
task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:188 [inline]
exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166
prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x411051
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 34 19 00 00 c3 48
83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48
89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007ffd6e8617b0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000411051
RDX: 0000000000000000 RSI: 0000000000731850 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 00007ffd6e8616e0 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000001 R14: 0000000000000156 R15: 0000000000000005
Kernel Offset: disabled
Rebooting in 86400 seconds..
---
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#bug-status-tracking for how to communicate with
syzbot.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: WARNING in __put_task_struct (2)
2018-10-08 16:12 WARNING in __put_task_struct (2) syzbot
@ 2018-10-08 16:15 ` Dmitry Vyukov
2018-10-08 19:45 ` Jason Gunthorpe
2018-10-14 17:12 ` syzbot
1 sibling, 1 reply; 6+ messages in thread
From: Dmitry Vyukov @ 2018-10-08 16:15 UTC (permalink / raw)
To: syzbot, dledford, Jason Gunthorpe, Leon Romanovsky, swise, markb,
linux-rdma
Cc: Andrew Morton, Eric W. Biederman, guro, Kees Cook,
Kirill A. Shutemov, LKML, Andy Lutomirski, marcos.souza.org,
Michal Hocko, Rik van Riel, syzkaller-bugs, Will Drewry
On Mon, Oct 8, 2018 at 6:12 PM, syzbot
<syzbot+1ed9dfaa984c88cf0ef8@syzkaller.appspotmail.com> wrote:
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit: ae16eea39a86 Add linux-next specific files for 20181008
> git tree: linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=12e7c6a1400000
> kernel config: https://syzkaller.appspot.com/x/.config?x=42525ce985d1a955
> dashboard link: https://syzkaller.appspot.com/bug?extid=1ed9dfaa984c88cf0ef8
> compiler: gcc (GCC) 8.0.1 20180413 (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+1ed9dfaa984c88cf0ef8@syzkaller.appspotmail.com
This was triggered by the following program, all is rdma-related, so
+rdma maintainers.
10:27:26 executing program 5:
r0 = openat$rdma_cm(0xffffffffffffff9c,
&(0x7f0000000380)='/dev/infiniband/rdma_cm\x00', 0x2, 0x0)
write$RDMA_USER_CM_CMD_CREATE_ID(r0, &(0x7f0000000080)={0x0, 0x18,
0xfa00, {0x0, &(0x7f0000000040)={<r1=>0xffffffffffffffff}, 0x13f}},
0x12d)
write$RDMA_USER_CM_CMD_RESOLVE_IP(r0, &(0x7f0000000200)={0x3, 0x40,
0xfa00, {{0xa, 0x4e21}, {0xa, 0x0, 0x0, @mcast1}, r1}}, 0x48)
write$RDMA_USER_CM_CMD_CREATE_ID(r0, &(0x7f0000000340)={0x0, 0x18,
0xfa00, {0x0, &(0x7f0000000300)={<r2=>0xffffffffffffffff}, 0x13f}},
0x20)
write$RDMA_USER_CM_CMD_SET_OPTION(r0, &(0x7f00000002c0)={0xe, 0x18,
0xfa00, @id_afonly={&(0x7f0000000000)=0x1, r1, 0x0, 0x2, 0x4}}, 0x20)
write$RDMA_USER_CM_CMD_RESOLVE_IP(r0, &(0x7f0000000100)={0x3, 0x40,
0xfa00, {{0x2, 0x4e21}, {0xa, 0x0, 0x0, @local}, r2}}, 0x1ff)
write$RDMA_USER_CM_CMD_DESTROY_ID(r0, &(0x7f0000000180)={0x1, 0x10,
0xfa00, {&(0x7f00000000c0), r2}}, 0x18)
> WARNING: CPU: 1 PID: 16271 at kernel/fork.c:718
> __put_task_struct+0x3ef/0x620 kernel/fork.c:718
> Kernel panic - not syncing: panic_on_warn set ...
>
> CPU: 1 PID: 16271 Comm: syz-executor5 Not tainted 4.19.0-rc7-next-20181008+
> #89
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Call Trace:
> __dump_stack lib/dump_stack.c:77 [inline]
> dump_stack+0x244/0x3ab lib/dump_stack.c:113
> panic+0x238/0x4e7 kernel/panic.c:184
> __warn.cold.8+0x163/0x1ba kernel/panic.c:536
> report_bug+0x254/0x2d0 lib/bug.c:186
> fixup_bug arch/x86/kernel/traps.c:178 [inline]
> do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271
> do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:290
> invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:969
> RIP: 0010:__put_task_struct+0x3ef/0x620 kernel/fork.c:718
> Code: 4c 89 ee e8 d3 9d 7b 00 e9 a1 fe ff ff e8 89 53 37 00 0f 0b e9 7c fd
> ff ff e8 7d 53 37 00 0f 0b e9 87 fd ff ff e8 71 53 37 00 <0f> 0b e9 d0 fc ff
> ff e8 65 53 37 00 49 8d 87 90 05 00 00 31 f6 48
> RSP: 0018:ffff88018dbcf808 EFLAGS: 00010293
> RAX: ffff880187474180 RBX: ffff88018cc7a1c0 RCX: ffffffff8147298d
> RDX: 0000000000000000 RSI: ffffffff81472cbf RDI: 0000000000000005
> RBP: ffff88018dbcf8e8 R08: ffff880187474180 R09: ffffed003198f43c
> R10: ffffed003198f43c R11: ffff88018cc7a1e3 R12: 1ffff10031b79f04
> R13: 0000000000000000 R14: ffff88018dbcf8c0 R15: ffff88018daceb40
> put_task_struct include/linux/sched/task.h:96 [inline]
> rdma_restrack_del+0x2e0/0x3b0 drivers/infiniband/core/restrack.c:243
> rdma_destroy_id+0x126/0xcc0 drivers/infiniband/core/cma.c:1820
> ucma_close+0x114/0x310 drivers/infiniband/core/ucma.c:1767
> __fput+0x3bc/0xa70 fs/file_table.c:279
> ____fput+0x15/0x20 fs/file_table.c:312
> task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
> tracehook_notify_resume include/linux/tracehook.h:188 [inline]
> exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166
> prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
> syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
> do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
> entry_SYSCALL_64_after_hwframe+0x49/0xbe
> RIP: 0033:0x411051
> Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 34 19 00 00 c3 48
> 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89
> c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
> RSP: 002b:00007ffd6e8617b0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
> RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000411051
> RDX: 0000000000000000 RSI: 0000000000731850 RDI: 0000000000000004
> RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
> R10: 00007ffd6e8616e0 R11: 0000000000000293 R12: 0000000000000000
> R13: 0000000000000001 R14: 0000000000000156 R15: 0000000000000005
> Kernel Offset: disabled
> Rebooting in 86400 seconds..
>
>
> ---
> 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#bug-status-tracking for how to communicate with
> syzbot.
>
> --
> You received this message because you are subscribed to the Google Groups
> "syzkaller-bugs" group.
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> For more options, visit https://groups.google.com/d/optout.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: WARNING in __put_task_struct (2)
2018-10-08 16:15 ` Dmitry Vyukov
@ 2018-10-08 19:45 ` Jason Gunthorpe
2018-10-09 11:30 ` Leon Romanovsky
0 siblings, 1 reply; 6+ messages in thread
From: Jason Gunthorpe @ 2018-10-08 19:45 UTC (permalink / raw)
To: Dmitry Vyukov
Cc: syzbot, dledford, Leon Romanovsky, swise, markb, linux-rdma,
Andrew Morton, Eric W. Biederman, guro, Kees Cook,
Kirill A. Shutemov, LKML, Andy Lutomirski, marcos.souza.org,
Michal Hocko, Rik van Riel, syzkaller-bugs, Will Drewry
On Mon, Oct 08, 2018 at 06:15:22PM +0200, Dmitry Vyukov wrote:
> On Mon, Oct 8, 2018 at 6:12 PM, syzbot
> <syzbot+1ed9dfaa984c88cf0ef8@syzkaller.appspotmail.com> wrote:
> > Hello,
> >
> > syzbot found the following crash on:
> >
> > HEAD commit: ae16eea39a86 Add linux-next specific files for 20181008
> > git tree: linux-next
> > console output: https://syzkaller.appspot.com/x/log.txt?x=12e7c6a1400000
> > kernel config: https://syzkaller.appspot.com/x/.config?x=42525ce985d1a955
> > dashboard link: https://syzkaller.appspot.com/bug?extid=1ed9dfaa984c88cf0ef8
> > compiler: gcc (GCC) 8.0.1 20180413 (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+1ed9dfaa984c88cf0ef8@syzkaller.appspotmail.com
>
>
> This was triggered by the following program, all is rdma-related, so
> +rdma maintainers.
>
> 10:27:26 executing program 5:
> r0 = openat$rdma_cm(0xffffffffffffff9c,
> &(0x7f0000000380)='/dev/infiniband/rdma_cm\x00', 0x2, 0x0)
> write$RDMA_USER_CM_CMD_CREATE_ID(r0, &(0x7f0000000080)={0x0, 0x18,
> 0xfa00, {0x0, &(0x7f0000000040)={<r1=>0xffffffffffffffff}, 0x13f}},
> 0x12d)
> write$RDMA_USER_CM_CMD_RESOLVE_IP(r0, &(0x7f0000000200)={0x3, 0x40,
> 0xfa00, {{0xa, 0x4e21}, {0xa, 0x0, 0x0, @mcast1}, r1}}, 0x48)
> write$RDMA_USER_CM_CMD_CREATE_ID(r0, &(0x7f0000000340)={0x0, 0x18,
> 0xfa00, {0x0, &(0x7f0000000300)={<r2=>0xffffffffffffffff}, 0x13f}},
> 0x20)
> write$RDMA_USER_CM_CMD_SET_OPTION(r0, &(0x7f00000002c0)={0xe, 0x18,
> 0xfa00, @id_afonly={&(0x7f0000000000)=0x1, r1, 0x0, 0x2, 0x4}}, 0x20)
> write$RDMA_USER_CM_CMD_RESOLVE_IP(r0, &(0x7f0000000100)={0x3, 0x40,
> 0xfa00, {{0x2, 0x4e21}, {0xa, 0x0, 0x0, @local}, r2}}, 0x1ff)
> write$RDMA_USER_CM_CMD_DESTROY_ID(r0, &(0x7f0000000180)={0x1, 0x10,
> 0xfa00, {&(0x7f00000000c0), r2}}, 0x18)
This might be fixed in Linux-next now by this commit:
Author: Leon Romanovsky <leonro@mellanox.com>
Date: Tue Oct 2 11:48:03 2018 +0300
RDMA/restrack: Release task struct which was hold by CM_ID object
Jason
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: WARNING in __put_task_struct (2)
2018-10-08 19:45 ` Jason Gunthorpe
@ 2018-10-09 11:30 ` Leon Romanovsky
2018-10-10 13:01 ` Dmitry Vyukov
0 siblings, 1 reply; 6+ messages in thread
From: Leon Romanovsky @ 2018-10-09 11:30 UTC (permalink / raw)
To: Jason Gunthorpe
Cc: Dmitry Vyukov, syzbot, dledford, swise, markb, linux-rdma,
Andrew Morton, Eric W. Biederman, guro, Kees Cook,
Kirill A. Shutemov, LKML, Andy Lutomirski, marcos.souza.org,
Michal Hocko, Rik van Riel, syzkaller-bugs, Will Drewry
[-- Attachment #1: Type: text/plain, Size: 2911 bytes --]
On Mon, Oct 08, 2018 at 01:45:13PM -0600, Jason Gunthorpe wrote:
> On Mon, Oct 08, 2018 at 06:15:22PM +0200, Dmitry Vyukov wrote:
> > On Mon, Oct 8, 2018 at 6:12 PM, syzbot
> > <syzbot+1ed9dfaa984c88cf0ef8@syzkaller.appspotmail.com> wrote:
> > > Hello,
> > >
> > > syzbot found the following crash on:
> > >
> > > HEAD commit: ae16eea39a86 Add linux-next specific files for 20181008
> > > git tree: linux-next
> > > console output: https://syzkaller.appspot.com/x/log.txt?x=12e7c6a1400000
> > > kernel config: https://syzkaller.appspot.com/x/.config?x=42525ce985d1a955
> > > dashboard link: https://syzkaller.appspot.com/bug?extid=1ed9dfaa984c88cf0ef8
> > > compiler: gcc (GCC) 8.0.1 20180413 (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+1ed9dfaa984c88cf0ef8@syzkaller.appspotmail.com
> >
> >
> > This was triggered by the following program, all is rdma-related, so
> > +rdma maintainers.
> >
> > 10:27:26 executing program 5:
> > r0 = openat$rdma_cm(0xffffffffffffff9c,
> > &(0x7f0000000380)='/dev/infiniband/rdma_cm\x00', 0x2, 0x0)
> > write$RDMA_USER_CM_CMD_CREATE_ID(r0, &(0x7f0000000080)={0x0, 0x18,
> > 0xfa00, {0x0, &(0x7f0000000040)={<r1=>0xffffffffffffffff}, 0x13f}},
> > 0x12d)
> > write$RDMA_USER_CM_CMD_RESOLVE_IP(r0, &(0x7f0000000200)={0x3, 0x40,
> > 0xfa00, {{0xa, 0x4e21}, {0xa, 0x0, 0x0, @mcast1}, r1}}, 0x48)
> > write$RDMA_USER_CM_CMD_CREATE_ID(r0, &(0x7f0000000340)={0x0, 0x18,
> > 0xfa00, {0x0, &(0x7f0000000300)={<r2=>0xffffffffffffffff}, 0x13f}},
> > 0x20)
> > write$RDMA_USER_CM_CMD_SET_OPTION(r0, &(0x7f00000002c0)={0xe, 0x18,
> > 0xfa00, @id_afonly={&(0x7f0000000000)=0x1, r1, 0x0, 0x2, 0x4}}, 0x20)
> > write$RDMA_USER_CM_CMD_RESOLVE_IP(r0, &(0x7f0000000100)={0x3, 0x40,
> > 0xfa00, {{0x2, 0x4e21}, {0xa, 0x0, 0x0, @local}, r2}}, 0x1ff)
> > write$RDMA_USER_CM_CMD_DESTROY_ID(r0, &(0x7f0000000180)={0x1, 0x10,
> > 0xfa00, {&(0x7f00000000c0), r2}}, 0x18)
>
> This might be fixed in Linux-next now by this commit:
>
> Author: Leon Romanovsky <leonro@mellanox.com>
> Date: Tue Oct 2 11:48:03 2018 +0300
>
> RDMA/restrack: Release task struct which was hold by CM_ID object
Jason,
I afraid that the opposite it more accurate.
This issue was introduced by that commit and According to linux-next
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next-history.git/tag/?h=next-20181008
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next-history.git/commit/?h=next-20181008&id=ae16eea39a86735f4ed0b5a6e9fe43c6cedb13b3
The RDMA tree has commit ed7a01fd3fd77f40b4ef2562b966a5decd8928d2,
which is exactly the one you cited above.
https://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma.git/commit/?h=for-next&id=ed7a01fd3fd77f40b4ef2562b966a5decd8928d2
Any ideas how?
Thanks
>
>
> Jason
[-- Attachment #2: signature.asc --]
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: WARNING in __put_task_struct (2)
2018-10-09 11:30 ` Leon Romanovsky
@ 2018-10-10 13:01 ` Dmitry Vyukov
0 siblings, 0 replies; 6+ messages in thread
From: Dmitry Vyukov @ 2018-10-10 13:01 UTC (permalink / raw)
To: Leon Romanovsky
Cc: Jason Gunthorpe, syzbot, dledford, swise, markb, linux-rdma,
Andrew Morton, Eric W. Biederman, guro, Kees Cook,
Kirill A. Shutemov, LKML, Andy Lutomirski, Marcos Souza,
Michal Hocko, Rik van Riel, syzkaller-bugs, Will Drewry
On Tue, Oct 9, 2018 at 1:30 PM, Leon Romanovsky <leon@kernel.org> wrote:
> On Mon, Oct 08, 2018 at 01:45:13PM -0600, Jason Gunthorpe wrote:
>> On Mon, Oct 08, 2018 at 06:15:22PM +0200, Dmitry Vyukov wrote:
>> > On Mon, Oct 8, 2018 at 6:12 PM, syzbot
>> > <syzbot+1ed9dfaa984c88cf0ef8@syzkaller.appspotmail.com> wrote:
>> > > Hello,
>> > >
>> > > syzbot found the following crash on:
>> > >
>> > > HEAD commit: ae16eea39a86 Add linux-next specific files for 20181008
>> > > git tree: linux-next
>> > > console output: https://syzkaller.appspot.com/x/log.txt?x=12e7c6a1400000
>> > > kernel config: https://syzkaller.appspot.com/x/.config?x=42525ce985d1a955
>> > > dashboard link: https://syzkaller.appspot.com/bug?extid=1ed9dfaa984c88cf0ef8
>> > > compiler: gcc (GCC) 8.0.1 20180413 (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+1ed9dfaa984c88cf0ef8@syzkaller.appspotmail.com
>> >
>> >
>> > This was triggered by the following program, all is rdma-related, so
>> > +rdma maintainers.
>> >
>> > 10:27:26 executing program 5:
>> > r0 = openat$rdma_cm(0xffffffffffffff9c,
>> > &(0x7f0000000380)='/dev/infiniband/rdma_cm\x00', 0x2, 0x0)
>> > write$RDMA_USER_CM_CMD_CREATE_ID(r0, &(0x7f0000000080)={0x0, 0x18,
>> > 0xfa00, {0x0, &(0x7f0000000040)={<r1=>0xffffffffffffffff}, 0x13f}},
>> > 0x12d)
>> > write$RDMA_USER_CM_CMD_RESOLVE_IP(r0, &(0x7f0000000200)={0x3, 0x40,
>> > 0xfa00, {{0xa, 0x4e21}, {0xa, 0x0, 0x0, @mcast1}, r1}}, 0x48)
>> > write$RDMA_USER_CM_CMD_CREATE_ID(r0, &(0x7f0000000340)={0x0, 0x18,
>> > 0xfa00, {0x0, &(0x7f0000000300)={<r2=>0xffffffffffffffff}, 0x13f}},
>> > 0x20)
>> > write$RDMA_USER_CM_CMD_SET_OPTION(r0, &(0x7f00000002c0)={0xe, 0x18,
>> > 0xfa00, @id_afonly={&(0x7f0000000000)=0x1, r1, 0x0, 0x2, 0x4}}, 0x20)
>> > write$RDMA_USER_CM_CMD_RESOLVE_IP(r0, &(0x7f0000000100)={0x3, 0x40,
>> > 0xfa00, {{0x2, 0x4e21}, {0xa, 0x0, 0x0, @local}, r2}}, 0x1ff)
>> > write$RDMA_USER_CM_CMD_DESTROY_ID(r0, &(0x7f0000000180)={0x1, 0x10,
>> > 0xfa00, {&(0x7f00000000c0), r2}}, 0x18)
>>
>> This might be fixed in Linux-next now by this commit:
>>
>> Author: Leon Romanovsky <leonro@mellanox.com>
>> Date: Tue Oct 2 11:48:03 2018 +0300
>>
>> RDMA/restrack: Release task struct which was hold by CM_ID object
>
> Jason,
>
> I afraid that the opposite it more accurate.
>
> This issue was introduced by that commit and According to linux-next
> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next-history.git/tag/?h=next-20181008
> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next-history.git/commit/?h=next-20181008&id=ae16eea39a86735f4ed0b5a6e9fe43c6cedb13b3
> The RDMA tree has commit ed7a01fd3fd77f40b4ef2562b966a5decd8928d2,
> which is exactly the one you cited above.
> https://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma.git/commit/?h=for-next&id=ed7a01fd3fd77f40b4ef2562b966a5decd8928d2
>
> Any ideas how?
I marked another bug as dup of this because it looks like the same root cause:
https://syzkaller.appspot.com/bug?id=e1854417677586ce3d00f498f19816cb4fd15676
And that dup bug has a C reproducer.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: WARNING in __put_task_struct (2)
2018-10-08 16:12 WARNING in __put_task_struct (2) syzbot
2018-10-08 16:15 ` Dmitry Vyukov
@ 2018-10-14 17:12 ` syzbot
1 sibling, 0 replies; 6+ messages in thread
From: syzbot @ 2018-10-14 17:12 UTC (permalink / raw)
To: akpm, dledford, dvyukov, ebiederm, guro, jgg, keescook,
kirill.shutemov, leon, linux-kernel, linux-rdma, luto,
marcos.souza.org, markb, mhocko, riel, swise, syzkaller-bugs,
wad
syzbot has found a reproducer for the following crash on:
HEAD commit: 774ea0551a29 Add linux-next specific files for 20181012
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=17f71735400000
kernel config: https://syzkaller.appspot.com/x/.config?x=273e86a7f336b114
dashboard link: https://syzkaller.appspot.com/bug?extid=1ed9dfaa984c88cf0ef8
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1735d391400000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1296a3a1400000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+1ed9dfaa984c88cf0ef8@syzkaller.appspotmail.com
audit: type=1800 audit(1539536806.030:30): pid=5454 uid=0 auid=4294967295
ses=4294967295 subj==unconfined op=collect_data cause=failed(directio)
comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0
IPVS: ftp: loaded support on port[0] = 21
WARNING: CPU: 1 PID: 5614 at kernel/fork.c:718
__put_task_struct+0x3ef/0x620 kernel/fork.c:718
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 5614 Comm: syz-executor338 Not tainted
4.19.0-rc7-next-20181012+ #93
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x244/0x3ab lib/dump_stack.c:113
panic+0x238/0x4e7 kernel/panic.c:184
__warn.cold.8+0x163/0x1ba kernel/panic.c:536
report_bug+0x254/0x2d0 lib/bug.c:186
fixup_bug arch/x86/kernel/traps.c:178 [inline]
do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271
do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:290
invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:969
RIP: 0010:__put_task_struct+0x3ef/0x620 kernel/fork.c:718
Code: 4c 89 ee e8 c3 a3 7b 00 e9 a1 fe ff ff e8 69 55 37 00 0f 0b e9 7c fd
ff ff e8 5d 55 37 00 0f 0b e9 87 fd ff ff e8 51 55 37 00 <0f> 0b e9 d0 fc
ff ff e8 45 55 37 00 49 8d 87 90 05 00 00 31 f6 48
RSP: 0018:ffff8801d7fcee48 EFLAGS: 00010293
RAX: ffff8801d7ffe5c0 RBX: ffff8801d82be540 RCX: ffffffff814711cd
RDX: 0000000000000000 RSI: ffffffff814714ff RDI: 0000000000000005
RBP: ffff8801d7fcef28 R08: ffff8801d7ffe5c0 R09: ffffed003b057cac
R10: ffffed003b057cac R11: ffff8801d82be563 R12: 1ffff1003aff9dcc
R13: 0000000000000000 R14: ffff8801d7fcef00 R15: ffff8801d7f7a9c0
put_task_struct include/linux/sched/task.h:96 [inline]
rdma_restrack_del+0x2e0/0x3b0 drivers/infiniband/core/restrack.c:243
rdma_destroy_id+0x126/0xcc0 drivers/infiniband/core/cma.c:1820
ucma_close+0x114/0x310 drivers/infiniband/core/ucma.c:1767
__fput+0x3bc/0xa70 fs/file_table.c:279
____fput+0x15/0x20 fs/file_table.c:312
task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0x1ad2/0x2610 kernel/exit.c:867
do_group_exit+0x177/0x440 kernel/exit.c:970
get_signal+0x8a8/0x1970 kernel/signal.c:2517
do_signal+0x9c/0x21c0 arch/x86/kernel/signal.c:816
exit_to_usermode_loop+0x2e5/0x380 arch/x86/entry/common.c:162
prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4460a9
Code: Bad RIP value.
RSP: 002b:00007f0e9c1a9da8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00000000006dbc48 RCX: 00000000004460a9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dbc48
RBP: 00000000006dbc40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc4c
R13: 666e692f7665642f R14: 0100000000000000 R15: 0000000000000003
Kernel Offset: disabled
Rebooting in 86400 seconds..
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2018-10-14 17:12 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-10-08 16:12 WARNING in __put_task_struct (2) syzbot
2018-10-08 16:15 ` Dmitry Vyukov
2018-10-08 19:45 ` Jason Gunthorpe
2018-10-09 11:30 ` Leon Romanovsky
2018-10-10 13:01 ` Dmitry Vyukov
2018-10-14 17:12 ` syzbot
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