syzbot


general protection fault in put_pwq_unlocked (2)

Status: moderation: reported on 2024/09/30 14:25
Subsystems: btrfs
[Documentation on labels]
Reported-by: syzbot+b0ef300d60e2c985ae11@syzkaller.appspotmail.com
First crash: 16d, last: 16d
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream general protection fault in put_pwq_unlocked btrfs 7 130d 144d 26/28 fixed on 2024/07/31 03:12

Sample crash report:
BTRFS info (device loop1): last unmount of filesystem ed167579-eb65-4e76-9a50-61ac97e9b59d
Oops: general protection fault, probably for non-canonical address 0xe01ffbf110035943: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: maybe wild-memory-access in range [0x00ffff88801aca18-0x00ffff88801aca1f]
CPU: 1 UID: 0 PID: 5395 Comm: syz-executor Not tainted 6.11.0-syzkaller-10669-g11a299a7933e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:__lock_acquire+0x69/0x2050 kernel/locking/lockdep.c:5062
Code: b6 04 30 84 c0 0f 85 9b 16 00 00 45 31 f6 83 3d b8 cf ab 0e 00 0f 84 b6 13 00 00 89 54 24 54 89 5c 24 68 4c 89 f8 48 c1 e8 03 <80> 3c 30 00 74 12 4c 89 ff e8 b9 22 8b 00 48 be 00 00 00 00 00 fc
RSP: 0000:ffffc90002e7f5f0 EFLAGS: 00010002
RAX: 001ffff110035943 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: dffffc0000000000 RDI: 00ffff88801aca18
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: dffffc0000000000 R11: fffffbfff203772e R12: ffff88802c853c00
R13: 0000000000000001 R14: 0000000000000000 R15: 00ffff88801aca18
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f19d9480000 CR3: 00000000582a6000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5822
 __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:5883
 btrfs_destroy_workqueue+0x45/0x260 fs/btrfs/async-thread.c:360
 btrfs_stop_all_workers+0x218/0x2a0 fs/btrfs/disk-io.c:1793
 close_ctree+0x67d/0xd20 fs/btrfs/disk-io.c:4351
 generic_shutdown_super+0x139/0x2d0 fs/super.c:642
 kill_anon_super+0x3b/0x70 fs/super.c:1237
 btrfs_kill_super+0x41/0x50 fs/btrfs/super.c:2121
 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:228
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0xa2f/0x28e0 kernel/exit.c:939
 do_group_exit+0x207/0x2c0 kernel/exit.c:1088
 __do_sys_exit_group kernel/exit.c:1099 [inline]
 __se_sys_exit_group kernel/exit.c:1097 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1097
 x64_sys_call+0x2634/0x2640 arch/x86/include/generated/asm/syscalls_64.h:232
 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: 0033:0x7f83cd77df39
Code: Unable to access opcode bytes at 0x7f83cd77df0f.
RSP: 002b:00007ffd6ba00688 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f83cd7f0114 RCX: 00007f83cd77df39
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 000000000000000d R08: 00007ffd6b9fe426 R09: 00007ffd6ba01940
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd6ba01940
R13: 00007f83cd7f00b4 R14: 000055558ffe44a8 R15: 00007ffd6ba03af0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__lock_acquire+0x69/0x2050 kernel/locking/lockdep.c:5062
Code: b6 04 30 84 c0 0f 85 9b 16 00 00 45 31 f6 83 3d b8 cf ab 0e 00 0f 84 b6 13 00 00 89 54 24 54 89 5c 24 68 4c 89 f8 48 c1 e8 03 <80> 3c 30 00 74 12 4c 89 ff e8 b9 22 8b 00 48 be 00 00 00 00 00 fc
RSP: 0000:ffffc90002e7f5f0 EFLAGS: 00010002
RAX: 001ffff110035943 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: dffffc0000000000 RDI: 00ffff88801aca18
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: dffffc0000000000 R11: fffffbfff203772e R12: ffff88802c853c00
R13: 0000000000000001 R14: 0000000000000000 R15: 00ffff88801aca18
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f19d9480000 CR3: 00000000582a6000 CR4: 00000000003506f0
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 9b 16 	xor    %al,0x169b850f(%rax,%rax,8)
   9:	00 00                	add    %al,(%rax)
   b:	45 31 f6             	xor    %r14d,%r14d
   e:	83 3d b8 cf ab 0e 00 	cmpl   $0x0,0xeabcfb8(%rip)        # 0xeabcfcd
  15:	0f 84 b6 13 00 00    	je     0x13d1
  1b:	89 54 24 54          	mov    %edx,0x54(%rsp)
  1f:	89 5c 24 68          	mov    %ebx,0x68(%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 b9 22 8b 00       	call   0x8b22f1
  38:	48                   	rex.W
  39:	be 00 00 00 00       	mov    $0x0,%esi
  3e:	00 fc                	add    %bh,%ah

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/09/26 14:16 upstream 11a299a7933e 0d19f247 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs general protection fault in put_pwq_unlocked
* Struck through repros no longer work on HEAD.