syzbot


general protection fault in __bch2_btree_node_write

Status: moderation: reported on 2024/05/27 08:14
Subsystems: bcachefs
[Documentation on labels]
Reported-by: syzbot+fc94f8f2007fe097c9a4@syzkaller.appspotmail.com
First crash: 21d, last: 20d

Sample crash report:
bcachefs (loop0): alloc_read... done
bcachefs (loop0): stripes_read... done
bcachefs (loop0): snapshots_read... done
bcachefs (loop0): going read-write
bcachefs (loop0): journal_replay...
Oops: general protection fault, probably for non-canonical address 0xe01ffbf11005867e: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: maybe wild-memory-access in range [0x00ffff88802c33f0-0x00ffff88802c33f7]
CPU: 3 PID: 6039 Comm: syz-executor.0 Not tainted 6.9.0-syzkaller-11952-gc760b3725e52 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:__lock_acquire+0xe3e/0x3b30 kernel/locking/lockdep.c:5005
Code: 11 00 00 39 05 a3 ff 1f 12 0f 82 be 05 00 00 ba 01 00 00 00 e9 e4 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f 85 82 1f 00 00 49 81 3c 24 a0 6d e3 92 0f 84 98 f2
RSP: 0018:ffffc90003c56be0 EFLAGS: 00010007
RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 001ffff11005867e RSI: ffff888020248000 RDI: 00ffff88802c33f7
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff8fe2b0d7 R11: 0000000000000004 R12: 00ffff88802c33f7
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff88802c300000(0063) knlGS:00000000f5ea9b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00005574da18aef8 CR3: 000000005c4d2000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 lock_acquire kernel/locking/lockdep.c:5754 [inline]
 lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
 __queue_work+0x39e/0x1020 kernel/workqueue.c:2319
 queue_work_on+0x11a/0x140 kernel/workqueue.c:2410
 queue_work include/linux/workqueue.h:621 [inline]
 __bch2_btree_node_write+0x1ec6/0x2ca0 fs/bcachefs/btree_io.c:2227
 bch2_btree_node_write+0xaa/0x2f0 fs/bcachefs/btree_io.c:2302
 btree_node_write_if_need fs/bcachefs/btree_io.h:151 [inline]
 __btree_node_flush+0x2fb/0x3c0 fs/bcachefs/btree_trans_commit.c:250
 journal_flush_pins.constprop.0+0x4b6/0xa50 fs/bcachefs/journal_reclaim.c:553
 journal_flush_done+0x253/0x2c0 fs/bcachefs/journal_reclaim.c:809
 bch2_journal_flush_pins+0x131/0x240 fs/bcachefs/journal_reclaim.c:839
 bch2_journal_flush_all_pins fs/bcachefs/journal_reclaim.h:76 [inline]
 bch2_journal_replay+0x1094/0x1390 fs/bcachefs/recovery.c:301
 bch2_run_recovery_pass+0x8e/0x1a0 fs/bcachefs/recovery_passes.c:182
 bch2_run_recovery_passes+0x33b/0x710 fs/bcachefs/recovery_passes.c:225
 bch2_fs_recovery+0x259f/0x3b60 fs/bcachefs/recovery.c:804
 bch2_fs_start+0x2e9/0x600 fs/bcachefs/super.c:1031
 bch2_fs_open+0xde0/0x10f0 fs/bcachefs/super.c:2123
 bch2_mount+0xd41/0x1090 fs/bcachefs/fs.c:1917
 legacy_get_tree+0x109/0x220 fs/fs_context.c:662
 vfs_get_tree+0x8f/0x380 fs/super.c:1780
 do_new_mount fs/namespace.c:3352 [inline]
 path_mount+0x6e1/0x1f10 fs/namespace.c:3679
 do_mount fs/namespace.c:3692 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount fs/namespace.c:3875 [inline]
 __ia32_sys_mount+0x295/0x320 fs/namespace.c:3875
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf72b7579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f5ea9400 EFLAGS: 00000292 ORIG_RAX: 0000000000000015
RAX: ffffffffffffffda RBX: 00000000f5ea9460 RCX: 0000000020000040
RDX: 0000000020000340 RSI: 0000000000000000 RDI: 00000000f5ea94a0
RBP: 00000000f5ea9460 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__lock_acquire+0xe3e/0x3b30 kernel/locking/lockdep.c:5005
Code: 11 00 00 39 05 a3 ff 1f 12 0f 82 be 05 00 00 ba 01 00 00 00 e9 e4 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f 85 82 1f 00 00 49 81 3c 24 a0 6d e3 92 0f 84 98 f2
RSP: 0018:ffffc90003c56be0 EFLAGS: 00010007
RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 001ffff11005867e RSI: ffff888020248000 RDI: 00ffff88802c33f7
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff8fe2b0d7 R11: 0000000000000004 R12: 00ffff88802c33f7
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff88802c300000(0063) knlGS:00000000f5ea9b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00005574da18aef8 CR3: 000000005c4d2000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	11 00                	adc    %eax,(%rax)
   2:	00 39                	add    %bh,(%rcx)
   4:	05 a3 ff 1f 12       	add    $0x121fffa3,%eax
   9:	0f 82 be 05 00 00    	jb     0x5cd
   f:	ba 01 00 00 00       	mov    $0x1,%edx
  14:	e9 e4 00 00 00       	jmp    0xfd
  19:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  20:	fc ff df
  23:	4c 89 e2             	mov    %r12,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2e:	0f 85 82 1f 00 00    	jne    0x1fb6
  34:	49 81 3c 24 a0 6d e3 	cmpq   $0xffffffff92e36da0,(%r12)
  3b:	92
  3c:	0f                   	.byte 0xf
  3d:	84                   	.byte 0x84
  3e:	98                   	cwtl
  3f:	f2                   	repnz

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/05/23 22:22 upstream c760b3725e52 c2e07261 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 general protection fault in __bch2_btree_node_write
2024/05/23 08:05 upstream 5f16eb0549ab c2e07261 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 general protection fault in __bch2_btree_node_write
* Struck through repros no longer work on HEAD.