syzbot


WARNING in btrfs_relocate_block_group

Status: upstream: reported C repro on 2023/06/19 01:45
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+b82f2cfdd0c9121adf2b@syzkaller.appspotmail.com
First crash: 371d, last: 199d
Fix bisection: failed (error log, bisect log)
  
Bug presence (1)
Date Name Commit Repro Result
2023/06/19 upstream (ToT) dbad9ce9397e C [report] WARNING in btrfs_relocate_block_group
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in btrfs_relocate_block_group btrfs C error inconclusive 6 102d 401d 0/27 upstream: reported C repro on 2023/05/20 14:55
linux-5.15 WARNING in btrfs_relocate_block_group origin:upstream C 1 36d 374d 0/3 upstream: reported C repro on 2023/06/16 22:29
Fix bisection attempts (5)
Created Duration User Patch Repo Result
2024/01/07 16:02 1h08m bisect fix linux-6.1.y error job log (0)
2023/12/08 13:04 2h11m bisect fix linux-6.1.y job log (0) log
2023/11/07 15:47 2h46m bisect fix linux-6.1.y job log (0) log
2023/10/05 12:38 2h52m bisect fix linux-6.1.y job log (0) log
2023/08/08 02:03 5h04m bisect fix linux-6.1.y job log (0) log

Sample crash report:
BTRFS info (device loop4): balance: start -d -m
BTRFS info (device loop4): relocating block group 6881280 flags data|metadata
------------[ cut here ]------------
WARNING: CPU: 1 PID: 5090 at fs/btrfs/relocation.c:4095 btrfs_relocate_block_group+0xcd8/0xd70
Modules linked in:
CPU: 1 PID: 5090 Comm: syz-executor169 Not tainted 6.1.34-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
RIP: 0010:btrfs_relocate_block_group+0xcd8/0xd70 fs/btrfs/relocation.c:4095
Code: fe 48 c7 c7 a0 a4 2e 8b 48 c7 c6 40 a4 2e 8b ba 95 0f 00 00 e8 44 99 e7 06 e8 14 a5 ef fd 0f 0b e9 62 fd ff ff e8 08 a5 ef fd <0f> 0b e9 b5 fd ff ff e8 fc a4 ef fd 0f 0b e9 08 fe ff ff 44 89 e1
RSP: 0018:ffffc9000bb4fa28 EFLAGS: 00010293
RAX: ffffffff839a3048 RBX: 0000000000190000 RCX: ffff888020545940
RDX: 0000000000000000 RSI: 0000000000190000 RDI: 0000000000000000
RBP: ffff888017732068 R08: ffffffff839a2df6 R09: fffff52001769f35
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff888028379000
R13: 0000000000000000 R14: ffff888079140000 R15: ffff888079140010
FS:  00007fde7761a700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000200025c0 CR3: 00000000214bb000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 btrfs_relocate_chunk+0x128/0x3b0 fs/btrfs/volumes.c:3296
 __btrfs_balance+0x1c16/0x27d0 fs/btrfs/volumes.c:4033
 btrfs_balance+0xbd7/0x1110 fs/btrfs/volumes.c:4416
 btrfs_ioctl_balance+0x493/0x7c0 fs/btrfs/ioctl.c:4488
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fde7ea90089
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 15 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fde7761a2f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fde7eb1a7f0 RCX: 00007fde7ea90089
RDX: 00000000200003c0 RSI: 00000000c4009420 RDI: 0000000000000005
RBP: 00007fde7eae74ac R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e
R13: 61635f7261656c63 R14: 0100000000008001 R15: 00007fde7eb1a7f8
 </TASK>

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/06/19 01:44 linux-6.1.y ca87e77a2ef8 f3921d4d .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan WARNING in btrfs_relocate_block_group
* Struck through repros no longer work on HEAD.