BTRFS info (device loop4): balance: start -d -m
BTRFS info (device loop4): relocating block group 6881280 flags data|metadata
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WARNING: CPU: 0 PID: 6475 at fs/btrfs/relocation.c:4044 btrfs_relocate_block_group+0xcff/0xde0 fs/btrfs/relocation.c:4044
Modules linked in:
CPU: 0 UID: 0 PID: 6475 Comm: syz-executor.4 Not tainted 6.16.0-rc6-syzkaller-00002-g155a3c003e55 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:btrfs_relocate_block_group+0xcff/0xde0 fs/btrfs/relocation.c:4044
Code: 8b 2c 24 e9 3d f9 ff ff e8 2e 9f e9 fd 48 8b 2c 24 e9 43 f9 ff ff e8 20 9f e9 fd 90 0f 0b 90 e9 29 ff ff ff e8 12 9f e9 fd 90 <0f> 0b 90 e9 76 ff ff ff e8 04 9f e9 fd 90 0f 0b 90 eb c2 44 89 f9
RSP: 0018:ffffc9000b937a10 EFLAGS: 00010293
RAX: ffffffff83d6933e RBX: ffff8880762dc010 RCX: ffff88804bba0000
RDX: 0000000000000000 RSI: 0000000000190000 RDI: 0000000000000000
RBP: 0000000000190000 R08: ffffc9000b937987 R09: 1ffff92001726f30
R10: dffffc0000000000 R11: fffff52001726f31 R12: 1ffff1100f7ede00
R13: 0000000000000000 R14: ffff8880762dc000 R15: ffff88807bf6f000
FS:  00007fa1bed0e6c0(0000) GS:ffff888125c4f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f574c9da000 CR3: 000000007607c000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 btrfs_relocate_chunk+0x12a/0x3b0 fs/btrfs/volumes.c:3437
 __btrfs_balance+0x1870/0x21d0 fs/btrfs/volumes.c:4212
 btrfs_balance+0xc94/0x11d0 fs/btrfs/volumes.c:4589
 btrfs_ioctl_balance+0x3d3/0x610 fs/btrfs/ioctl.c:3583
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa1be07c959
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa1bed0e0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fa1be19c050 RCX: 00007fa1be07c959
RDX: 00000000200003c0 RSI: 00000000c4009420 RDI: 0000000000000005
RBP: 00007fa1be0d8c88 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007fa1be19c050 R15: 00007ffe41bf3488
 </TASK>