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WARNING in btrfs_relocate_block_group

Status: upstream: reported C repro on 2023/05/20 14:55
Subsystems: btrfs
[Documentation on labels]
Reported-by: syzbot+07a7e6273e07bda9ef8b@syzkaller.appspotmail.com
First crash: 339d, last: 36d
Cause bisection: failed (error log, bisect log)
  
Fix bisection: the issue occurs on the latest tested release (bisect log)
  
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [btrfs?] WARNING in btrfs_relocate_block_group 0 (2) 2023/06/23 20:18
▶ ▼ Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 WARNING in btrfs_relocate_block_group origin:upstream C 1 4d04h 308d 0/3 upstream: reported C repro on 2023/06/16 22:29
linux-6.1 WARNING in btrfs_relocate_block_group origin:upstream C error 1 133d 306d 0/3 upstream: reported C repro on 2023/06/19 01:45
▶ ▼ Last patch testing requests (2)
Created Duration User Patch Repo Result
2023/10/17 23:31 23m retest repro upstream OK log
2023/08/22 21:54 56m retest repro upstream report log
▶ ▼ Fix bisection attempts (8)
Created Duration User Patch Repo Result
2024/04/17 08:22 3h18m bisect fix upstream job log (0)
2024/03/14 15:45 2h24m bisect fix upstream job log (0) log
2024/02/10 18:41 1h59m bisect fix upstream job log (0) log
2024/01/04 06:37 1h52m bisect fix upstream job log (0) log
2023/12/04 09:10 1h52m bisect fix upstream job log (0) log
2023/11/03 04:07 2h51m bisect fix upstream job log (0) log
2023/10/03 20:57 1h56m bisect fix upstream job log (0) log
2023/07/28 12:17 2h46m bisect fix upstream job log (0) log

Sample crash report:
BTRFS info (device loop0): relocating block group 6881280 flags data|metadata
------------[ cut here ]------------
WARNING: CPU: 1 PID: 5901 at fs/btrfs/relocation.c:4123 btrfs_relocate_block_group+0xcda/0xd70
Modules linked in:
CPU: 1 PID: 5901 Comm: syz-executor.0 Not tainted 6.4.0-rc2-syzkaller-00015-g1b66c114d161 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
RIP: 0010:btrfs_relocate_block_group+0xcda/0xd70 fs/btrfs/relocation.c:4123
Code: fe 48 c7 c7 80 2e 2b 8b 48 c7 c6 20 2e 2b 8b ba b1 0f 00 00 e8 b7 c4 10 07 e8 e2 e2 ee fd 0f 0b e9 62 fd ff ff e8 d6 e2 ee fd <0f> 0b e9 b5 fd ff ff e8 ca e2 ee fd 0f 0b e9 08 fe ff ff 44 89 e1
RSP: 0018:ffffc9000ae1fa28 EFLAGS: 00010293
RAX: ffffffff839c99ca RBX: 0000000000190000 RCX: ffff88806f4d0000
RDX: 0000000000000000 RSI: 0000000000190000 RDI: 0000000000000000
RBP: ffff88806d673068 R08: ffffffff839c9778 R09: fffff520015c3f35
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88806e4e2000
R13: 0000000000000000 R14: ffff88806e750000 R15: ffff88806e750010
FS:  00007fdf35b02700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe4fb4e6000 CR3: 000000002079a000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 btrfs_relocate_chunk+0x12c/0x3b0 fs/btrfs/volumes.c:3276
 __btrfs_balance+0x1b06/0x2690 fs/btrfs/volumes.c:4011
 btrfs_balance+0xbdb/0x1120 fs/btrfs/volumes.c:4395
 btrfs_ioctl_balance+0x493/0x7c0 fs/btrfs/ioctl.c:3599
 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+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fdf34e8c169
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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:00007fdf35b02168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fdf34fac050 RCX: 00007fdf34e8c169
RDX: 00000000200003c0 RSI: 00000000c4009420 RDI: 0000000000000005
RBP: 00007fdf34ee7ca1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff060f715f R14: 00007fdf35b02300 R15: 0000000000022000
 </TASK>

Crashes (6):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/05/18 08:26 upstream 1b66c114d161 3bb7af1d .config console log report syz [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs WARNING in btrfs_relocate_block_group
2023/06/23 20:17 upstream 8a28a0b6f1a1 09ffe269 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kasan-gce-root WARNING in btrfs_relocate_block_group
2023/06/23 05:37 upstream 8a28a0b6f1a1 79782afc .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_relocate_block_group
2023/06/15 13:07 upstream b6dad5178cea 90d4044e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_relocate_block_group
2023/05/18 07:08 upstream 1b66c114d161 3bb7af1d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_relocate_block_group
2023/05/16 14:51 upstream f1fcbaa18b28 71b00cfb .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in btrfs_relocate_block_group
* Struck through repros no longer work on HEAD.