syzbot


general protection fault in btrfs_cache_block_group (2)

Status: moderation: reported on 2024/11/29 16:58
Subsystems: btrfs
[Documentation on labels]
Reported-by: syzbot+943c86f35a80e9793a37@syzkaller.appspotmail.com
First crash: 25d, last: 25d
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream general protection fault in btrfs_cache_block_group btrfs 4 179d 211d 0/28 auto-obsoleted due to no activity on 2024/09/22 14:49

Sample crash report:
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: 0 UID: 0 PID: 5948 Comm: syz.2.12 Not tainted 6.12.0-next-20241125-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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 db 17 9f 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 b8 b9 8f 00 48 be 00 00 00 00 00 fc
RSP: 0018:ffffc900055eed30 EFLAGS: 00010002
RAX: 001ffff110035943 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: dffffc0000000000 RDI: 00ffff88801aca18
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000001
R10: dffffc0000000000 R11: fffffbfff20332c7 R12: ffff888020700000
R13: 0000000000000000 R14: 0000000000000000 R15: 00ffff88801aca18
FS:  00007f64c56956c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fad8d308ab8 CR3: 000000002817a000 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 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
 btrfs_cache_block_group+0x540/0x6f0 fs/btrfs/block-group.c:962
 find_free_extent+0x4a1e/0x5850 fs/btrfs/extent-tree.c:4490
 btrfs_reserve_extent+0x422/0x810 fs/btrfs/extent-tree.c:4672
 btrfs_alloc_tree_block+0x202/0x1440 fs/btrfs/extent-tree.c:5127
 btrfs_force_cow_block+0x526/0x1da0 fs/btrfs/ctree.c:573
 btrfs_cow_block+0x35e/0xa40 fs/btrfs/ctree.c:754
 btrfs_search_slot+0xbe3/0x3150 fs/btrfs/ctree.c:2152
 btrfs_update_root+0xf6/0xc70 fs/btrfs/root-tree.c:144
 btrfs_ioctl_subvol_setflags+0x4c3/0x760 fs/btrfs/ioctl.c:1521
 btrfs_ioctl+0x8ea/0xcc0 fs/btrfs/ioctl.c:5184
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:906 [inline]
 __se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892
 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: 0033:0x7f64c497e819
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007f64c5695038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f64c4b35fa0 RCX: 00007f64c497e819
RDX: 0000000020000080 RSI: 000000004008941a RDI: 0000000000000003
RBP: 00007f64c49f175e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f64c4b35fa0 R15: 00007ffdf67ff4a8
 </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 db 17 9f 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 b8 b9 8f 00 48 be 00 00 00 00 00 fc
RSP: 0018:ffffc900055eed30 EFLAGS: 00010002
RAX: 001ffff110035943 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: dffffc0000000000 RDI: 00ffff88801aca18
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000001
R10: dffffc0000000000 R11: fffffbfff20332c7 R12: ffff888020700000
R13: 0000000000000000 R14: 0000000000000000 R15: 00ffff88801aca18
FS:  00007f64c56956c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fad8d308ab8 CR3: 000000002817a000 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 db 17 9f 0e 00 	cmpl   $0x0,0xe9f17db(%rip)        # 0xe9f17f0
  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 b8 b9 8f 00       	call   0x8fb9f0
  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
2024/11/25 16:46 linux-next 85a2dd7d7c81 a84878fc .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in btrfs_cache_block_group
* Struck through repros no longer work on HEAD.