syzbot


general protection fault in bch2_journal_do_writes

Status: moderation: reported on 2024/05/22 19:40
Subsystems: bcachefs
[Documentation on labels]
Reported-by: syzbot+ed5efc01523cf96f60e2@syzkaller.appspotmail.com
First crash: 27d, last: 21d

Sample crash report:
bcachefs (loop0): resume_logged_ops... done
bcachefs (loop0): going read-write
bcachefs (loop0): done starting filesystem
Oops: general protection fault, probably for non-canonical address 0xe7001bfff110033a: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: maybe wild-memory-access in range [0x3800ffff888019d0-0x3800ffff888019d7]
CPU: 2 PID: 5294 Comm: syz-executor.0 Not tainted 6.9.0-syzkaller-12124-g6d69b6c12fce #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 f3 56 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 e0 bd e2 92 0f 84 98 f2
RSP: 0018:ffffc90002eef2f0 EFLAGS: 00010007
RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 07001ffff110033a RSI: ffff88801e9e4880 RDI: 3800ffff888019d4
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff8fe2ad97 R11: 0000000000000003 R12: 3800ffff888019d4
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff88802c200000(0063) knlGS:00000000f5e76b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000058240f4c CR3: 00000000281bc000 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]
 closure_queue include/linux/closure.h:267 [inline]
 closure_call include/linux/closure.h:402 [inline]
 bch2_journal_do_writes+0x3ea/0x4f0 fs/bcachefs/journal.c:201
 __bch2_journal_buf_put fs/bcachefs/journal.h:276 [inline]
 __journal_entry_close+0x846/0xb40 fs/bcachefs/journal.c:301
 journal_entry_want_write+0xda/0x2f0 fs/bcachefs/journal.c:321
 bch2_journal_flush_seq_async.part.0+0x804/0xa20 fs/bcachefs/journal.c:743
 bch2_journal_flush_seq_async fs/bcachefs/journal.c:765 [inline]
 bch2_journal_flush_seq+0x1b6/0x360 fs/bcachefs/journal.c:760
 bch2_flush_inode.part.0+0x242/0x300 fs/bcachefs/fs-io.c:185
 bch2_flush_inode fs/bcachefs/bcachefs.h:1164 [inline]
 bch2_fsync+0x223/0x2c0 fs/bcachefs/fs-io.c:203
 vfs_fsync_range+0x141/0x230 fs/sync.c:188
 generic_write_sync include/linux/fs.h:2794 [inline]
 bch2_buffered_write fs/bcachefs/fs-io-buffered.c:1128 [inline]
 bch2_write_iter+0x756/0x3180 fs/bcachefs/fs-io-buffered.c:1136
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0x6b6/0x1140 fs/read_write.c:590
 ksys_write+0x12f/0x260 fs/read_write.c:643
 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: 0023:0xf7284579
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:00000000f5e765ac EFLAGS: 00000292 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000020000180
RDX: 0000000000002000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000292 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 f3 56 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 e0 bd e2 92 0f 84 98 f2
RSP: 0018:ffffc90002eef2f0 EFLAGS: 00010007
RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 07001ffff110033a RSI: ffff88801e9e4880 RDI: 3800ffff888019d4
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff8fe2ad97 R11: 0000000000000003 R12: 3800ffff888019d4
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff88802c200000(0063) knlGS:00000000f5e76b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000058240f4c CR3: 00000000281bc000 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 f3 56 1f 12       	add    $0x121f56f3,%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 e0 bd e2 	cmpq   $0xffffffff92e2bde0,(%r12)
  3b:	92
  3c:	0f                   	.byte 0xf
  3d:	84                   	.byte 0x84
  3e:	98                   	cwtl
  3f:	f2                   	repnz

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/05/24 14:13 upstream 6d69b6c12fce c2e07261 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 general protection fault in bch2_journal_do_writes
2024/05/21 14:40 upstream 8f6a15f095a6 c2e07261 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 general protection fault in bch2_journal_do_writes
2024/05/18 19:35 upstream 4b377b4868ef c2e07261 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 general protection fault in bch2_journal_do_writes
* Struck through repros no longer work on HEAD.