syzbot


WARNING in bch2_writepage_io_done

Status: upstream: reported on 2024/05/19 03:09
Subsystems: bcachefs
[Documentation on labels]
Reported-by: syzbot+b643774cddb3862d7886@syzkaller.appspotmail.com
First crash: 31d, last: 31d
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [bcachefs?] WARNING in bch2_writepage_io_done 0 (1) 2024/05/19 03:09

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 2 PID: 5296 at fs/bcachefs/fs-io-buffered.c:438 bch2_writepage_io_done+0x8fc/0xe20 fs/bcachefs/fs-io-buffered.c:438
Modules linked in:
CPU: 2 PID: 5296 Comm: syz-executor.1 Not tainted 6.9.0-syzkaller-01893-g6bfd2d442af5 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:bch2_writepage_io_done+0x8fc/0xe20 fs/bcachefs/fs-io-buffered.c:438
Code: ff e8 28 5d 90 fd 8b 84 24 88 00 00 00 48 8b 74 24 08 48 8b 7c 24 10 8d 50 01 89 04 24 e8 cc ec ff ff eb c5 e8 05 5d 90 fd 90 <0f> 0b 90 e8 fc 5c 90 fd 48 8b 44 24 18 48 8d 78 f8 48 b8 00 00 00
RSP: 0018:ffffc90002c173b8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000008 RCX: ffffffff83fe3d29
RDX: ffff88801ec48000 RSI: ffffffff83fe447b RDI: 0000000000000007
RBP: 0000000000000008 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000002 R12: ffffea00019079c0
R13: ffff888060fe5700 R14: dffffc0000000000 R15: 0000000000000008
FS:  0000000000000000(0000) GS:ffff88802c400000(0063) knlGS:00000000f5eedb40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000055680e9c9e18 CR3: 000000005d36e000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 bch2_write_done+0x243/0x400 fs/bcachefs/io_write.c:478
 bch2_write_data_inline fs/bcachefs/io_write.c:1550 [inline]
 bch2_write+0xab2/0x13f0 fs/bcachefs/io_write.c:1616
 bch2_writepages+0x136/0x200 fs/bcachefs/fs-io-buffered.c:660
 do_writepages+0x1a3/0x7f0 mm/page-writeback.c:2613
 filemap_fdatawrite_wbc mm/filemap.c:397 [inline]
 filemap_fdatawrite_wbc+0x148/0x1c0 mm/filemap.c:387
 __filemap_fdatawrite_range+0xba/0x100 mm/filemap.c:430
 file_write_and_wait_range+0xd0/0x140 mm/filemap.c:788
 bch2_fsync+0xa1/0x2a0 fs/bcachefs/fs-io.c:197
 vfs_fsync_range+0x141/0x230 fs/sync.c:188
 generic_write_sync include/linux/fs.h:2811 [inline]
 bch2_buffered_write fs/bcachefs/fs-io-buffered.c:1136 [inline]
 bch2_write_iter+0x756/0x3180 fs/bcachefs/fs-io-buffered.c:1144
 call_write_iter include/linux/fs.h:2120 [inline]
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0x6b6/0x1120 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+0x75/0x120 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: 0023:0xf72fb579
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:00000000f5eed5ac EFLAGS: 00000292 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000020001900
RDX: 000000000000000b RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	10 06                	adc    %al,(%rsi)
   2:	03 74 b4 01          	add    0x1(%rsp,%rsi,4),%esi
   6:	10 07                	adc    %al,(%rdi)
   8:	03 74 b0 01          	add    0x1(%rax,%rsi,4),%esi
   c:	10 08                	adc    %cl,(%rax)
   e:	03 74 d8 01          	add    0x1(%rax,%rbx,8),%esi
  1e:	00 51 52             	add    %dl,0x52(%rcx)
  21:	55                   	push   %rbp
  22:	89 e5                	mov    %esp,%ebp
  24:	0f 34                	sysenter
  26:	cd 80                	int    $0x80
* 28:	5d                   	pop    %rbp <-- trapping instruction
  29:	5a                   	pop    %rdx
  2a:	59                   	pop    %rcx
  2b:	c3                   	ret
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	90                   	nop
  2f:	90                   	nop
  30:	8d b4 26 00 00 00 00 	lea    0x0(%rsi,%riz,1),%esi
  37:	8d b4 26 00 00 00 00 	lea    0x0(%rsi,%riz,1),%esi

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/05/15 03:08 upstream 6bfd2d442af5 fdb4c10c .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in bch2_writepage_io_done
2024/05/15 03:06 upstream 6bfd2d442af5 fdb4c10c .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in bch2_writepage_io_done
* Struck through repros no longer work on HEAD.