BTRFS info (device loop0): balance: start -d -m
BTRFS info (device loop0): relocating block group 6881280 flags data|metadata
BTRFS info (device loop0): relocating block group 5242880 flags data|metadata
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5328 at fs/btrfs/extent-tree.c:3198 __btrfs_free_extent+0x29c1/0x3990 fs/btrfs/extent-tree.c:3198
Modules linked in:
CPU: 0 UID: 0 PID: 5328 Comm: syz.0.0 Not tainted 6.14.0-syzkaller-13183-g06a22366d6a1 #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_free_extent+0x29c1/0x3990 fs/btrfs/extent-tree.c:3198
Code: 8b 44 24 08 8b 10 48 89 df 48 c7 c6 20 9c 8c 8c e8 44 56 39 fd 49 be 00 00 00 00 00 fc ff df bb 8b ff ff ff e9 8b f3 ff ff 90 <0f> 0b 90 48 8b 44 24 20 42 80 3c 20 00 48 8b 1c 24 74 08 48 89 df
RSP: 0018:ffffc9000d19edc0 EFLAGS: 00010246
RAX: 0000000000000002 RBX: 00000000fffffffe RCX: 0000000000100000
RDX: 0000000000000002 RSI: ffffffff8f2c2a50 RDI: 00000000fffffffe
RBP: ffffc9000d19ef90 R08: 0000000000000005 R09: ffffffff83ee4ecc
R10: 0000000000000002 R11: ffff88803eeca440 R12: dffffc0000000000
R13: ffff888053f20bf0 R14: 00000000fffffffe R15: ffff888053f27c60
FS:  00007fbca1c0f6c0(0000) GS:ffff88808c597000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000002480 CR3: 00000000411f6000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 run_delayed_data_ref fs/btrfs/extent-tree.c:1597 [inline]
 run_one_delayed_ref fs/btrfs/extent-tree.c:1777 [inline]
 btrfs_run_delayed_refs_for_head fs/btrfs/extent-tree.c:1970 [inline]
 __btrfs_run_delayed_refs+0xd1e/0x4160 fs/btrfs/extent-tree.c:2040
 btrfs_run_delayed_refs+0xe3/0x2f0 fs/btrfs/extent-tree.c:2152
 btrfs_commit_transaction+0x4ae/0x3650 fs/btrfs/transaction.c:2209
 prepare_to_merge+0x86d/0x15a0 fs/btrfs/relocation.c:1777
 relocate_block_group+0xb01/0xd50 fs/btrfs/relocation.c:3676
 btrfs_relocate_block_group+0x777/0xd80 fs/btrfs/relocation.c:4011
 btrfs_relocate_chunk+0x12c/0x3b0 fs/btrfs/volumes.c:3511
 __btrfs_balance+0x1a93/0x25e0 fs/btrfs/volumes.c:4292
 btrfs_balance+0xbde/0x10c0 fs/btrfs/volumes.c:4669
 btrfs_ioctl_balance+0x3f5/0x660 fs/btrfs/ioctl.c:3586
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:906 [inline]
 __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:892
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbca0d8d169
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:00007fbca1c0f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fbca0fa6080 RCX: 00007fbca0d8d169
RDX: 0000200000000180 RSI: 00000000c4009420 RDI: 0000000000000007
RBP: 00007fbca0e0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fbca0fa6080 R15: 00007ffd7686f078
 </TASK>