* WARNING: locking bug in copy_process
@ 2019-05-10 1:07 syzbot
2019-05-10 5:09 ` Christian Brauner
0 siblings, 1 reply; 2+ messages in thread
From: syzbot @ 2019-05-10 1:07 UTC (permalink / raw)
To: akpm, arnd, arunks, christian, cyphar, dhowells, ebiederm,
elena.reshetova, guro, jannh, keescook, linux-kernel, luto, luto,
mhocko, mingo, mtk.manpages, namit, oleg, peterz, riel, shakeelb,
syzkaller-bugs, tglx, torvalds, viro, wad
Hello,
syzbot found the following crash on:
HEAD commit: a2d635de Merge tag 'drm-next-2019-05-09' of git://anongit...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12b36dd0a00000
kernel config: https://syzkaller.appspot.com/x/.config?x=2ef407aed78c3758
dashboard link: https://syzkaller.appspot.com/bug?extid=3286e58549edc479faae
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
userspace arch: i386
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12d85ec8a00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11df8778a00000
The bug was bisected to:
commit b3e5838252665ee4cfa76b82bdf1198dca81e5be
Author: Christian Brauner <christian@brauner.io>
Date: Wed Mar 27 12:04:15 2019 +0000
clone: add CLONE_PIDFD
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=14fe77b4a00000
final crash: https://syzkaller.appspot.com/x/report.txt?x=16fe77b4a00000
console output: https://syzkaller.appspot.com/x/log.txt?x=12fe77b4a00000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+3286e58549edc479faae@syzkaller.appspotmail.com
Fixes: b3e583825266 ("clone: add CLONE_PIDFD")
entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7fec849
Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 14 24 c3 8b 3c 24 c3 90 90
90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90
90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000ffed5a8c EFLAGS: 00000246 ORIG_RAX: 0000000000000078
RAX: ffffffffffffffda RBX: 0000000000003ffc RCX: 0000000000000000
RDX: 00000000200005c0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000012 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(depth <= 0)
WARNING: CPU: 1 PID: 7744 at kernel/locking/lockdep.c:4052 __lock_release
kernel/locking/lockdep.c:4052 [inline]
WARNING: CPU: 1 PID: 7744 at kernel/locking/lockdep.c:4052
lock_release+0x667/0xa00 kernel/locking/lockdep.c:4321
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 7744 Comm: syz-executor007 Not tainted 5.1.0+ #4
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+0x172/0x1f0 lib/dump_stack.c:113
panic+0x2cb/0x65c kernel/panic.c:214
__warn.cold+0x20/0x45 kernel/panic.c:566
report_bug+0x263/0x2b0 lib/bug.c:186
fixup_bug arch/x86/kernel/traps.c:179 [inline]
fixup_bug arch/x86/kernel/traps.c:174 [inline]
do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:272
do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:291
invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:972
RIP: 0010:__lock_release kernel/locking/lockdep.c:4052 [inline]
RIP: 0010:lock_release+0x667/0xa00 kernel/locking/lockdep.c:4321
Code: 0f 85 a0 03 00 00 8b 35 77 66 08 08 85 f6 75 23 48 c7 c6 a0 55 6b 87
48 c7 c7 40 25 6b 87 4c 89 85 70 ff ff ff e8 b7 a9 eb ff <0f> 0b 4c 8b 85
70 ff ff ff 4c 89 ea 4c 89 e6 4c 89 c7 e8 52 63 ff
RSP: 0018:ffff888094117b48 EFLAGS: 00010086
RAX: 0000000000000000 RBX: 1ffff11012822f6f RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815af236 RDI: ffffed1012822f5b
RBP: ffff888094117c00 R08: ffff888092bfc400 R09: fffffbfff113301d
R10: fffffbfff113301c R11: ffffffff889980e3 R12: ffffffff8a451df8
R13: ffffffff8142e71f R14: ffffffff8a44cc80 R15: ffff888094117bd8
percpu_up_read.constprop.0+0xcb/0x110 include/linux/percpu-rwsem.h:92
cgroup_threadgroup_change_end include/linux/cgroup-defs.h:712 [inline]
copy_process.part.0+0x47ff/0x6710 kernel/fork.c:2222
copy_process kernel/fork.c:1772 [inline]
_do_fork+0x25d/0xfd0 kernel/fork.c:2338
__do_compat_sys_x86_clone arch/x86/ia32/sys_ia32.c:240 [inline]
__se_compat_sys_x86_clone arch/x86/ia32/sys_ia32.c:236 [inline]
__ia32_compat_sys_x86_clone+0xbc/0x140 arch/x86/ia32/sys_ia32.c:236
do_syscall_32_irqs_on arch/x86/entry/common.c:334 [inline]
do_fast_syscall_32+0x281/0xd54 arch/x86/entry/common.c:405
entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7fec849
Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 14 24 c3 8b 3c 24 c3 90 90
90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90
90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000ffed5a8c EFLAGS: 00000246 ORIG_RAX: 0000000000000078
RAX: ffffffffffffffda RBX: 0000000000003ffc RCX: 0000000000000000
RDX: 00000000200005c0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000012 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
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#status for how to communicate with syzbot.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: WARNING: locking bug in copy_process
2019-05-10 1:07 WARNING: locking bug in copy_process syzbot
@ 2019-05-10 5:09 ` Christian Brauner
0 siblings, 0 replies; 2+ messages in thread
From: Christian Brauner @ 2019-05-10 5:09 UTC (permalink / raw)
To: syzbot, akpm, arnd, arunks, cyphar, dhowells, ebiederm,
elena.reshetova, guro, jannh, keescook, linux-kernel, luto, luto,
mhocko, mingo, mtk.manpages, namit, oleg, peterz, riel, shakeelb,
syzkaller-bugs, tglx, torvalds, viro, wad
On May 10, 2019 3:07:05 AM GMT+02:00, syzbot <syzbot+3286e58549edc479faae@syzkaller.appspotmail.com> wrote:
>Hello,
>
>syzbot found the following crash on:
>
>HEAD commit: a2d635de Merge tag 'drm-next-2019-05-09' of
>git://anongit...
>git tree: upstream
>console output:
>https://syzkaller.appspot.com/x/log.txt?x=12b36dd0a00000
>kernel config:
>https://syzkaller.appspot.com/x/.config?x=2ef407aed78c3758
>dashboard link:
>https://syzkaller.appspot.com/bug?extid=3286e58549edc479faae
>compiler: gcc (GCC) 9.0.0 20181231 (experimental)
>userspace arch: i386
>syz repro:
>https://syzkaller.appspot.com/x/repro.syz?x=12d85ec8a00000
>C reproducer:
>https://syzkaller.appspot.com/x/repro.c?x=11df8778a00000
>
>The bug was bisected to:
>
>commit b3e5838252665ee4cfa76b82bdf1198dca81e5be
>Author: Christian Brauner <christian@brauner.io>
>Date: Wed Mar 27 12:04:15 2019 +0000
>
> clone: add CLONE_PIDFD
>
>bisection log:
>https://syzkaller.appspot.com/x/bisect.txt?x=14fe77b4a00000
>final crash:
>https://syzkaller.appspot.com/x/report.txt?x=16fe77b4a00000
>console output:
>https://syzkaller.appspot.com/x/log.txt?x=12fe77b4a00000
>
>IMPORTANT: if you fix the bug, please add the following tag to the
>commit:
>Reported-by: syzbot+3286e58549edc479faae@syzkaller.appspotmail.com
>Fixes: b3e583825266 ("clone: add CLONE_PIDFD")
>
> entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
>RIP: 0023:0xf7fec849
>Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 14 24 c3 8b 3c 24 c3 90
>90
>90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3
>90
>90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90
>RSP: 002b:00000000ffed5a8c EFLAGS: 00000246 ORIG_RAX: 0000000000000078
>RAX: ffffffffffffffda RBX: 0000000000003ffc RCX: 0000000000000000
>RDX: 00000000200005c0 RSI: 0000000000000000 RDI: 0000000000000000
>RBP: 0000000000000012 R08: 0000000000000000 R09: 0000000000000000
>R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
>R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
>------------[ cut here ]------------
>DEBUG_LOCKS_WARN_ON(depth <= 0)
>WARNING: CPU: 1 PID: 7744 at kernel/locking/lockdep.c:4052
>__lock_release
>kernel/locking/lockdep.c:4052 [inline]
>WARNING: CPU: 1 PID: 7744 at kernel/locking/lockdep.c:4052
>lock_release+0x667/0xa00 kernel/locking/lockdep.c:4321
>Kernel panic - not syncing: panic_on_warn set ...
>CPU: 1 PID: 7744 Comm: syz-executor007 Not tainted 5.1.0+ #4
>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+0x172/0x1f0 lib/dump_stack.c:113
> panic+0x2cb/0x65c kernel/panic.c:214
> __warn.cold+0x20/0x45 kernel/panic.c:566
> report_bug+0x263/0x2b0 lib/bug.c:186
> fixup_bug arch/x86/kernel/traps.c:179 [inline]
> fixup_bug arch/x86/kernel/traps.c:174 [inline]
> do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:272
> do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:291
> invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:972
>RIP: 0010:__lock_release kernel/locking/lockdep.c:4052 [inline]
>RIP: 0010:lock_release+0x667/0xa00 kernel/locking/lockdep.c:4321
>Code: 0f 85 a0 03 00 00 8b 35 77 66 08 08 85 f6 75 23 48 c7 c6 a0 55 6b
>87
>48 c7 c7 40 25 6b 87 4c 89 85 70 ff ff ff e8 b7 a9 eb ff <0f> 0b 4c 8b
>85
>70 ff ff ff 4c 89 ea 4c 89 e6 4c 89 c7 e8 52 63 ff
>RSP: 0018:ffff888094117b48 EFLAGS: 00010086
>RAX: 0000000000000000 RBX: 1ffff11012822f6f RCX: 0000000000000000
>RDX: 0000000000000000 RSI: ffffffff815af236 RDI: ffffed1012822f5b
>RBP: ffff888094117c00 R08: ffff888092bfc400 R09: fffffbfff113301d
>R10: fffffbfff113301c R11: ffffffff889980e3 R12: ffffffff8a451df8
>R13: ffffffff8142e71f R14: ffffffff8a44cc80 R15: ffff888094117bd8
> percpu_up_read.constprop.0+0xcb/0x110 include/linux/percpu-rwsem.h:92
> cgroup_threadgroup_change_end include/linux/cgroup-defs.h:712 [inline]
> copy_process.part.0+0x47ff/0x6710 kernel/fork.c:2222
> copy_process kernel/fork.c:1772 [inline]
> _do_fork+0x25d/0xfd0 kernel/fork.c:2338
> __do_compat_sys_x86_clone arch/x86/ia32/sys_ia32.c:240 [inline]
> __se_compat_sys_x86_clone arch/x86/ia32/sys_ia32.c:236 [inline]
> __ia32_compat_sys_x86_clone+0xbc/0x140 arch/x86/ia32/sys_ia32.c:236
> do_syscall_32_irqs_on arch/x86/entry/common.c:334 [inline]
> do_fast_syscall_32+0x281/0xd54 arch/x86/entry/common.c:405
> entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
>RIP: 0023:0xf7fec849
>Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 14 24 c3 8b 3c 24 c3 90
>90
>90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3
>90
>90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90
>RSP: 002b:00000000ffed5a8c EFLAGS: 00000246 ORIG_RAX: 0000000000000078
>RAX: ffffffffffffffda RBX: 0000000000003ffc RCX: 0000000000000000
>RDX: 00000000200005c0 RSI: 0000000000000000 RDI: 0000000000000000
>RBP: 0000000000000012 R08: 0000000000000000 R09: 0000000000000000
>R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
>R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
>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#status for how to communicate with syzbot.
>For information about bisection process see:
>https://goo.gl/tpsmEJ#bisection
>syzbot can test patches for this bug, for details see:
>https://goo.gl/tpsmEJ#testing-patches
I think I know how this comes about.
I'll send a patch later today.
Christian
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2019-05-10 5:09 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-05-10 1:07 WARNING: locking bug in copy_process syzbot
2019-05-10 5:09 ` Christian Brauner
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.