BUG: unable to handle kernel paging request in finish_writeback_work
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syzbot
Sep 25, 2019, 1:09:08 AM9/25/19
to syzkaller-upst...@googlegroups.com
Hello,
syzbot found the following crash on:
HEAD commit: b41dae06 Merge tag 'xfs-5.4-merge-7' of git://git.kernel.o..
git tree: bpf-next
console output: https://syzkaller.appspot.com/x/log.txt?x=17e19a7e600000
kernel config: https://syzkaller.appspot.com/x/.config?x=dfcf592db22b9132
dashboard link: https://syzkaller.appspot.com/bug?extid=430eca490e0ed6f90995
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
CC: [linux-...@vger.kernel.org linux-...@vger.kernel.org
vi...@zeniv.linux.org.uk net...@vger.kernel.org]
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+430eca...@syzkaller.appspotmail.com
BUG: unable to handle page fault for address: ffffffff7ef66200
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 8e70067 P4D 8e70067 PUD 0
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 21 Comm: kworker/u4:1 Not tainted 5.3.0+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Workqueue: writeback wb_workfn (flush-8:0)
RIP: 0010:variable_test_bit arch/x86/include/asm/bitops.h:214 [inline]
RIP: 0010:test_bit include/asm-generic/bitops-instrumented.h:238 [inline]
RIP: 0010:__lock_acquire+0x1575/0x4e70 kernel/locking/lockdep.c:3925
Code: 4c 89 9d 40 ff ff ff 49 8d 45 3f 4d 85 ed 4c 89 95 48 ff ff ff 49 0f
49 c5 48 c1 f8 06 48 8d 3c c5 60 89 77 8a e8 8b 3e 54 00 <4c> 0f a3 2d 13
20 1f 09 4c 8b 95 48 ff ff ff 4c 8b 9d 40 ff ff ff
RSP: 0018:ffff8880a9a3f938 EFLAGS: 00010046
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff81586945
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff7ef66208
RBP: ffff8880a9a3fa48 R08: 1fffffffefdecc41 R09: fffffbffefdecc42
R10: fffffbffefdecc41 R11: ffffffff7ef6620f R12: a23c1e8ba3f6c51a
R13: ffffffffa3f6c51a R14: 0000000000000000 R15: 00000000000c051a
FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff7ef66200 CR3: 000000006bafb000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4487
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:159
__wake_up_common_lock+0xc8/0x150 kernel/sched/wait.c:122
__wake_up+0xe/0x10 kernel/sched/wait.c:142
finish_writeback_work.isra.0+0xf6/0x120 fs/fs-writeback.c:168
wb_do_writeback fs/fs-writeback.c:2030 [inline]
wb_workfn+0x34f/0x11e0 fs/fs-writeback.c:2070
process_one_work+0x9af/0x1740 kernel/workqueue.c:2269
worker_thread+0x98/0xe40 kernel/workqueue.c:2415
kthread+0x361/0x430 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Modules linked in:
CR2: ffffffff7ef66200
---[ end trace 311cd2cfbc9dd6fe ]---
RIP: 0010:variable_test_bit arch/x86/include/asm/bitops.h:214 [inline]
RIP: 0010:test_bit include/asm-generic/bitops-instrumented.h:238 [inline]
RIP: 0010:__lock_acquire+0x1575/0x4e70 kernel/locking/lockdep.c:3925
Code: 4c 89 9d 40 ff ff ff 49 8d 45 3f 4d 85 ed 4c 89 95 48 ff ff ff 49 0f
49 c5 48 c1 f8 06 48 8d 3c c5 60 89 77 8a e8 8b 3e 54 00 <4c> 0f a3 2d 13
20 1f 09 4c 8b 95 48 ff ff ff 4c 8b 9d 40 ff ff ff
RSP: 0018:ffff8880a9a3f938 EFLAGS: 00010046
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff81586945
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff7ef66208
RBP: ffff8880a9a3fa48 R08: 1fffffffefdecc41 R09: fffffbffefdecc42
R10: fffffbffefdecc41 R11: ffffffff7ef6620f R12: a23c1e8ba3f6c51a
R13: ffffffffa3f6c51a R14: 0000000000000000 R15: 00000000000c051a
FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff7ef66200 CR3: 000000006bafb000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
---
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 syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot found the following crash on:
HEAD commit: b41dae06 Merge tag 'xfs-5.4-merge-7' of git://git.kernel.o..
git tree: bpf-next
console output: https://syzkaller.appspot.com/x/log.txt?x=17e19a7e600000
kernel config: https://syzkaller.appspot.com/x/.config?x=dfcf592db22b9132
dashboard link: https://syzkaller.appspot.com/bug?extid=430eca490e0ed6f90995
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
CC: [linux-...@vger.kernel.org linux-...@vger.kernel.org
vi...@zeniv.linux.org.uk net...@vger.kernel.org]
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+430eca...@syzkaller.appspotmail.com
BUG: unable to handle page fault for address: ffffffff7ef66200
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 8e70067 P4D 8e70067 PUD 0
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 21 Comm: kworker/u4:1 Not tainted 5.3.0+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Workqueue: writeback wb_workfn (flush-8:0)
RIP: 0010:variable_test_bit arch/x86/include/asm/bitops.h:214 [inline]
RIP: 0010:test_bit include/asm-generic/bitops-instrumented.h:238 [inline]
RIP: 0010:__lock_acquire+0x1575/0x4e70 kernel/locking/lockdep.c:3925
Code: 4c 89 9d 40 ff ff ff 49 8d 45 3f 4d 85 ed 4c 89 95 48 ff ff ff 49 0f
49 c5 48 c1 f8 06 48 8d 3c c5 60 89 77 8a e8 8b 3e 54 00 <4c> 0f a3 2d 13
20 1f 09 4c 8b 95 48 ff ff ff 4c 8b 9d 40 ff ff ff
RSP: 0018:ffff8880a9a3f938 EFLAGS: 00010046
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff81586945
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff7ef66208
RBP: ffff8880a9a3fa48 R08: 1fffffffefdecc41 R09: fffffbffefdecc42
R10: fffffbffefdecc41 R11: ffffffff7ef6620f R12: a23c1e8ba3f6c51a
R13: ffffffffa3f6c51a R14: 0000000000000000 R15: 00000000000c051a
FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff7ef66200 CR3: 000000006bafb000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4487
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:159
__wake_up_common_lock+0xc8/0x150 kernel/sched/wait.c:122
__wake_up+0xe/0x10 kernel/sched/wait.c:142
finish_writeback_work.isra.0+0xf6/0x120 fs/fs-writeback.c:168
wb_do_writeback fs/fs-writeback.c:2030 [inline]
wb_workfn+0x34f/0x11e0 fs/fs-writeback.c:2070
process_one_work+0x9af/0x1740 kernel/workqueue.c:2269
worker_thread+0x98/0xe40 kernel/workqueue.c:2415
kthread+0x361/0x430 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Modules linked in:
CR2: ffffffff7ef66200
---[ end trace 311cd2cfbc9dd6fe ]---
RIP: 0010:variable_test_bit arch/x86/include/asm/bitops.h:214 [inline]
RIP: 0010:test_bit include/asm-generic/bitops-instrumented.h:238 [inline]
RIP: 0010:__lock_acquire+0x1575/0x4e70 kernel/locking/lockdep.c:3925
Code: 4c 89 9d 40 ff ff ff 49 8d 45 3f 4d 85 ed 4c 89 95 48 ff ff ff 49 0f
49 c5 48 c1 f8 06 48 8d 3c c5 60 89 77 8a e8 8b 3e 54 00 <4c> 0f a3 2d 13
20 1f 09 4c 8b 95 48 ff ff ff 4c 8b 9d 40 ff ff ff
RSP: 0018:ffff8880a9a3f938 EFLAGS: 00010046
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff81586945
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff7ef66208
RBP: ffff8880a9a3fa48 R08: 1fffffffefdecc41 R09: fffffbffefdecc42
R10: fffffbffefdecc41 R11: ffffffff7ef6620f R12: a23c1e8ba3f6c51a
R13: ffffffffa3f6c51a R14: 0000000000000000 R15: 00000000000c051a
FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff7ef66200 CR3: 000000006bafb000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
---
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 syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot
Sep 25, 2019, 6:08:52 AM9/25/19
to Tetsuo Handa, penguin...@i-love.sakura.ne.jp, syzkaller-upst...@googlegroups.com
> finish_writeback_work.isra.0+0xf6/0x120 fs/fs-writeback.c:168
> #syz dup: general protection fault in finish_writeback_work
Your 'dup:' command is accepted, but please keep
syzkaller-upst...@googlegroups.com mailing list in CC next
time. It serves as a history of what happened with each bug report. Thank
you.
> #syz dup: general protection fault in finish_writeback_work
Your 'dup:' command is accepted, but please keep
syzkaller-upst...@googlegroups.com mailing list in CC next
time. It serves as a history of what happened with each bug report. Thank
you.
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