el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
------------[ cut here ]------------
kernel BUG at fs/btrfs/extent-tree.c:3310!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 4977 Comm: syz.0.16 Not tainted 5.15.188-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : btrfs_free_tree_block+0xac8/0xc5c fs/btrfs/extent-tree.c:3310
lr : btrfs_free_tree_block+0xac8/0xc5c fs/btrfs/extent-tree.c:3310
sp : ffff80001f9d7420
x29: ffff80001f9d7520 x28: ffff0000ca9c4ba0 x27: ffff0000dea02420
x26: 00000000fffffff4 x25: 0000000000000001 x24: ffff0000ca9c4cc0
x23: 0000000000000001 x22: ffff0000ca9c4ba8 x21: 1fffe00019538998
x20: 1ffff0000276e080 x19: dfff800000000000 x18: 0000000000000001
x17: 0000000000000000 x16: ffff8000111d162c x15: ffff8000089327e4
x14: ffff800009f2518c x13: ffff8000089327e4 x12: 0000000000ff0100
x11: 0000000000000000 x10: 0000000000000000 x9 : ffff800009e314f0
x8 : ffff0000ce4d1b40 x7 : 0000000000000000 x6 : ffff80000805b444
x5 : ffff0000e5bf5fe0 x4 : 0000000000000000 x3 : ffff80001170b680
x2 : 0000000000000006 x1 : 00000000fffffff4 x0 : 0000000000000000
Call trace:
 btrfs_free_tree_block+0xac8/0xc5c fs/btrfs/extent-tree.c:3310
 btrfs_force_cow_block+0xc3c/0x1700 fs/btrfs/ctree.c:480
 btrfs_cow_block+0x2d8/0x66c fs/btrfs/ctree.c:598
 btrfs_search_slot+0xa10/0x1f4c fs/btrfs/ctree.c:1858
 btrfs_insert_empty_items+0x1e0/0x2a8 fs/btrfs/ctree.c:4012
 btrfs_insert_empty_item fs/btrfs/ctree.h:2957 [inline]
 insert_balance_item+0x14c/0x1118 fs/btrfs/volumes.c:3534
 btrfs_balance+0x8e4/0x1138 fs/btrfs/volumes.c:4447
 btrfs_ioctl_balance+0x4cc/0x658 fs/btrfs/ioctl.c:4152
 btrfs_ioctl+0x8d0/0xb38 fs/btrfs/ioctl.c:5012
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl fs/ioctl.c:860 [inline]
 __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:860
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
Code: c80a7e69 35ffffaa 17ffffa5 9799235f (d4210000) 
---[ end trace 742f99f047f2d1c3 ]---