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

syzbot
2024-12-14T15:27:24Z

syzbot has found a reproducer for the following issue on:

HEAD commit: a446e965a188 Merge tag '6.13-rc2-smb3-client-fixes' of git..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=11108344580000
kernel config: https://syzkaller.appspot.com/x/.config?x=c7c9f223bfe8924e
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=15108344580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/44e300b681ee/disk-a446e965.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/3a7c7a152318/vmlinux-a446e965.xz
kernel image: https://storage.googleapis.com/syzbot-assets/97df5473ab29/bzImage-a446e965.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/29ab3e8f6ac5/mount_0.gz

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

bcachefs (da441363-bb6a-4ab9-999b-c1f40db4fee2): shutdown complete
Oops: general protection fault, probably for non-canonical address 0xf11008476f002002: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: maybe wild-memory-access in range [0x8880623b78010010-0x8880623b78010017]
CPU: 1 UID: 0 PID: 6159 Comm: syz.1.34 Not tainted 6.13.0-rc2-syzkaller-00292-ga446e965a188 #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 1b d0 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 88 95 88 00 48 be 00 00 00 00 00 fc
RSP: 0018:ffffc900032b7010 EFLAGS: 00010803
RAX: 11100c476f002002 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: dffffc0000000000 RDI: 8880623b78010017
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000001
R10: dffffc0000000000 R11: fffffbfff203079f R12: ffff88802ea1da00
R13: 0000000000000000 R14: 0000000000000000 R15: 8880623b78010017
FS: 00007f150d2de6c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f82dd601000 CR3: 0000000060034000 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:592 [inline]
bch2_fs_release+0x629/0x7d0 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
bch2_fs_alloc fs/bcachefs/super.c:960 [inline]
bch2_fs_open+0x1ebe/0x2f80 fs/bcachefs/super.c:2065
bch2_fs_get_tree+0x738/0x1710 fs/bcachefs/fs.c:2157
vfs_get_tree+0x90/0x2b0 fs/super.c:1814
do_new_mount+0x2be/0xb40 fs/namespace.c:3507
do_mount fs/namespace.c:3847 [inline]
__do_sys_mount fs/namespace.c:4057 [inline]
__se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4034
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f150c5874ba
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f150d2dde68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f150d2ddef0 RCX: 00007f150c5874ba
RDX: 0000000020000080 RSI: 0000000020000000 RDI: 00007f150d2ddeb0
RBP: 0000000020000080 R08: 00007f150d2ddef0 R09: 0000000000800000
R10: 0000000000800000 R11: 0000000000000246 R12: 0000000020000000
R13: 00007f150d2ddeb0 R14: 000000000000595e R15: 0000000020000480
</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 1b d0 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 88 95 88 00 48 be 00 00 00 00 00 fc
RSP: 0018:ffffc900032b7010 EFLAGS: 00010803
RAX: 11100c476f002002 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: dffffc0000000000 RDI: 8880623b78010017
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000001
R10: dffffc0000000000 R11: fffffbfff203079f R12: ffff88802ea1da00
R13: 0000000000000000 R14: 0000000000000000 R15: 8880623b78010017
FS: 00007f150d2de6c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f82dd601000 CR3: 0000000060034000 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 1b d0 9d 0e 00 cmpl $0x0,0xe9dd01b(%rip) # 0xe9dd030
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 88 95 88 00 call 0x8895c0
38: 48 rex.W
39: be 00 00 00 00 mov $0x0,%esi
3e: 00 fc add %bh,%ah

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