BTRFS info (device loop0): balance: start -d -m
BTRFS info (device loop0): relocating block group 6881280 flags data|metadata
------------[ cut here ]------------
BTRFS: Transaction aborted (error -28)
WARNING: CPU: 0 PID: 5324 at fs/btrfs/volumes.c:3365 btrfs_remove_chunk+0x17a5/0x2070 fs/btrfs/volumes.c:3365
Modules linked in:
CPU: 0 UID: 0 PID: 5324 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:btrfs_remove_chunk+0x17a5/0x2070 fs/btrfs/volumes.c:3365
Code: 00 e8 bf fc cc fd 84 c0 74 2e e8 76 c2 e6 fd e9 05 01 00 00 e8 6c c2 e6 fd 90 48 c7 c7 40 23 af 8b 44 89 ee e8 6c cf a9 fd 90 <0f> 0b 90 90 e9 1f f9 ff ff e8 bd ff 74 07 e8 a8 07 75 07 41 89 c6
RSP: 0018:ffffc9000d3ef8c0 EFLAGS: 00010246
RAX: be68363840dda900 RBX: 0000000000000000 RCX: 0000000000100000
RDX: ffffc9000eaeb000 RSI: 000000000001adee RDI: 000000000001adef
RBP: ffffc9000d3efab0 R08: ffff88801fc24293 R09: 1ffff11003f84852
R10: dffffc0000000000 R11: ffffed1003f84853 R12: dffffc0000000000
R13: ffffffffffffffe4 R14: ffff88800dc6c001 R15: ffff888042cee940
FS:  00007fe35ad9d6c0(0000) GS:ffff88808d302000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000c1000 CR3: 00000000430d2000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 btrfs_relocate_chunk+0x29b/0x5c0 fs/btrfs/volumes.c:3496
 __btrfs_balance+0x1860/0x23f0 fs/btrfs/volumes.c:4227
 btrfs_balance+0xac2/0x11b0 fs/btrfs/volumes.c:4604
 btrfs_ioctl_balance+0x3d3/0x610 fs/btrfs/ioctl.c:3577
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe359f8efc9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe35ad9d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fe35a1e6090 RCX: 00007fe359f8efc9
RDX: 0000200000000180 RSI: 00000000c4009420 RDI: 0000000000000004
RBP: 00007fe35a011f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe35a1e6128 R14: 00007fe35a1e6090 R15: 00007ffcb23b4308
 </TASK>