syzbot


general protection fault in end_bbio_data_write

Status: moderation: reported on 2025/02/24 09:04
Subsystems: btrfs
[Documentation on labels]
Reported-by: syzbot+2cd2d38c1f2052afbb48@syzkaller.appspotmail.com
First crash: 7d13h, last: 7d13h

Sample crash report:
Oops: general protection fault, probably for non-canonical address 0xef5ba9001ffff113: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: maybe wild-memory-access in range [0x7add6800ffff8898-0x7add6800ffff889f]
CPU: 1 UID: 0 PID: 24 Comm: ksoftirqd/1 Not tainted 6.14.0-rc3-syzkaller-00079-g87a132e73910 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
RIP: 0010:__lock_acquire+0x6a/0x2100 kernel/locking/lockdep.c:5091
Code: b6 04 30 84 c0 0f 85 f8 16 00 00 45 31 f6 83 3d 0b 66 a0 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 78 43 8c 00 48 be 00 00 00 00 00 fc
RSP: 0018:ffffc900001e7530 EFLAGS: 00010012
RAX: 0f5bad001ffff113 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: dffffc0000000000 RDI: 7add6800ffff8898
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000001
R10: dffffc0000000000 R11: fffffbfff2079cef R12: ffff88801da88000
R13: 0000000000000000 R14: 0000000000000000 R15: 7add6800ffff8898
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f31df812f98 CR3: 0000000030da0000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
 __queue_work+0x759/0xf50
 queue_work_on+0x1c2/0x380 kernel/workqueue.c:2390
 end_bbio_data_write+0x3c3/0x670 fs/btrfs/extent_io.c:478
 __btrfs_bio_end_io fs/btrfs/bio.c:113 [inline]
 btrfs_bio_end_io+0x385/0x430 fs/btrfs/bio.c:141
 blk_update_request+0x5e5/0x1160 block/blk-mq.c:983
 blk_mq_end_request+0x3e/0x70 block/blk-mq.c:1145
 blk_complete_reqs block/blk-mq.c:1220 [inline]
 blk_done_softirq+0x102/0x150 block/blk-mq.c:1225
 handle_softirqs+0x2d6/0x9b0 kernel/softirq.c:561
 run_ksoftirqd+0xca/0x130 kernel/softirq.c:950
 smpboot_thread_fn+0x546/0xa30 kernel/smpboot.c:164
 kthread+0x7ab/0x920 kernel/kthread.c:464
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__lock_acquire+0x6a/0x2100 kernel/locking/lockdep.c:5091
Code: b6 04 30 84 c0 0f 85 f8 16 00 00 45 31 f6 83 3d 0b 66 a0 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 78 43 8c 00 48 be 00 00 00 00 00 fc
RSP: 0018:ffffc900001e7530 EFLAGS: 00010012
RAX: 0f5bad001ffff113 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: dffffc0000000000 RDI: 7add6800ffff8898
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000001
R10: dffffc0000000000 R11: fffffbfff2079cef R12: ffff88801da88000
R13: 0000000000000000 R14: 0000000000000000 R15: 7add6800ffff8898
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f31df812f98 CR3: 0000000030da0000 CR4: 0000000000350ef0
----------------
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 0b 66 a0 0e 00 	cmpl   $0x0,0xea0660b(%rip)        # 0xea06620
  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 78 43 8c 00       	call   0x8c43b0
  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
2025/02/20 08:53 upstream 87a132e73910 50668798 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in end_bbio_data_write
* Struck through repros no longer work on HEAD.