Re: [syzbot] [bcachefs?] general protection fault in put_pwq_unlocked (2)

syzbot
2024-12-19T04:39:26Z

syzbot has found a reproducer for the following issue on:

HEAD commit: eabcdba3ad40 Merge tag 'for-6.13-rc3-tag' of git://git.ker..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15adb730580000
kernel config: https://syzkaller.appspot.com/x/.config?x=1234f097ee657d8b
dashboard link: https://syzkaller.appspot.com/bug?extid=aa930d41d2f32904c5da
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16dc4cf8580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12faef44580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/7a4dff87674a/disk-eabcdba3.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/266bc2b7ced3/vmlinux-eabcdba3.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ee4bcd9be832/bzImage-eabcdba3.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/90ce8b925e79/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+aa930d41d2f32904c5da@syzkaller.appspotmail.com

Oops: general protection fault, probably for non-canonical address 0xf11024afb8802002: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: maybe wild-memory-access in range [0x8881457dc4010010-0x8881457dc4010017]
CPU: 1 UID: 0 PID: 5817 Comm: syz-executor163 Not tainted 6.13.0-rc3-syzkaller-00073-geabcdba3ad40 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024
RIP: 0010:__lock_acquire+0x6a/0x2100 kernel/locking/lockdep.c:5089
Code: b6 04 30 84 c0 0f 85 f8 16 00 00 45 31 f6 83 3d cb ce 9d 0e 00 0f 84 c8 13 00 00 89 54 24 60 89 5c 24 38 4c 89 f8 48 c1 e8 03 <80> 3c 30 00 74 12 4c 89 ff e8 38 93 88 00 48 be 00 00 00 00 00 fc
RSP: 0018:ffffc90003a87950 EFLAGS: 00010803
RAX: 111028afb8802002 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: dffffc0000000000 RDI: 8881457dc4010017
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000001
R10: dffffc0000000000 R11: fffffbfff2030a27 R12: ffff888030045a00
R13: 0000000000000000 R14: 0000000000000000 R15: 8881457dc4010017
FS: 00005555749e8480(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f624dfff000 CR3: 000000007761c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
_raw_spin_lock_irq+0xd3/0x120 kernel/locking/spinlock.c:170
put_pwq_unlocked+0x42/0x190 kernel/workqueue.c:1662
destroy_workqueue+0x99d/0xc40 kernel/workqueue.c:5897
__bch2_fs_free fs/bcachefs/super.c:596 [inline]
bch2_fs_release+0x69d/0x7d0 fs/bcachefs/super.c:611
kobject_cleanup lib/kobject.c:689 [inline]
kobject_release lib/kobject.c:720 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x22f/0x480 lib/kobject.c:737
deactivate_locked_super+0xc4/0x130 fs/super.c:473
cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1373
task_work_run+0x24f/0x310 kernel/task_work.c:239
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x13f/0x340 kernel/entry/common.c:218
do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f62555f9517
Code: 00 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 b0 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffe0e922dc8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f62555f9517
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffe0e922e80
RBP: 00007ffe0e922e80 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000202 R12: 00007ffe0e923f40
R13: 00005555749e97c0 R14: 00007ffe0e923f80 R15: 0000000000000008
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__lock_acquire+0x6a/0x2100 kernel/locking/lockdep.c:5089
Code: b6 04 30 84 c0 0f 85 f8 16 00 00 45 31 f6 83 3d cb ce 9d 0e 00 0f 84 c8 13 00 00 89 54 24 60 89 5c 24 38 4c 89 f8 48 c1 e8 03 <80> 3c 30 00 74 12 4c 89 ff e8 38 93 88 00 48 be 00 00 00 00 00 fc
RSP: 0018:ffffc90003a87950 EFLAGS: 00010803
RAX: 111028afb8802002 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: dffffc0000000000 RDI: 8881457dc4010017
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000001
R10: dffffc0000000000 R11: fffffbfff2030a27 R12: ffff888030045a00
R13: 0000000000000000 R14: 0000000000000000 R15: 8881457dc4010017
FS: 00005555749e8480(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f624dfff000 CR3: 000000007761c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: b6 04 mov $0x4,%dh
2: 30 84 c0 0f 85 f8 16 xor %al,0x16f8850f(%rax,%rax,8)
9: 00 00 add %al,(%rax)
b: 45 31 f6 xor %r14d,%r14d
e: 83 3d cb ce 9d 0e 00 cmpl $0x0,0xe9dcecb(%rip) # 0xe9dcee0
15: 0f 84 c8 13 00 00 je 0x13e3
1b: 89 54 24 60 mov %edx,0x60(%rsp)
1f: 89 5c 24 38 mov %ebx,0x38(%rsp)
23: 4c 89 f8 mov %r15,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 80 3c 30 00 cmpb $0x0,(%rax,%rsi,1) <-- trapping instruction
2e: 74 12 je 0x42
30: 4c 89 ff mov %r15,%rdi
33: e8 38 93 88 00 call 0x889370
38: 48 rex.W
39: be 00 00 00 00 mov $0x0,%esi
3e: 00 fc add %bh,%ah

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