el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
------------[ cut here ]------------
kernel BUG at fs/btrfs/extent-tree.c:3300!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 5762 Comm: syz.7.248 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026
pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : btrfs_free_tree_block+0xa04/0xa38 fs/btrfs/extent-tree.c:3300
lr : btrfs_free_tree_block+0xa04/0xa38 fs/btrfs/extent-tree.c:3300
sp : ffff800021b273c0
x29: ffff800021b274c0 x28: dfff800000000000 x27: ffff700004364e80
x26: ffff000000000001 x25: ffff800021b27420 x24: 00000000fffffff4
x23: 0000000000000001 x22: ffff000000000100 x21: ffff0000d4ad2d98
x20: ffff0000e0a839d8 x19: ffff0000d4ad2d90 x18: 0000000000000000
x17: 0000000000000000 x16: ffff8000082dd284 x15: ffff8000089ffd5c
x14: 0000000000000001 x13: 1ffff00002b84dce x12: 0000000000080000
x11: 000000000001269c x10: ffff800022b5a000 x9 : ffff800009fc86f8
x8 : 000000000001269d x7 : ffff80000805a700 x6 : ffff80000805a910
x5 : ffff0000f5e24de0 x4 : ffff800021b27038 x3 : 0000000000000000
x2 : 0000000000000006 x1 : 00000000fffffff4 x0 : 0000000000000000
dump_backtrace(regs = 00000000ecee5870 tsk = 0000000000000000)
Call trace:
 btrfs_free_tree_block+0xa04/0xa38 fs/btrfs/extent-tree.c:3300
 btrfs_force_cow_block+0xc38/0x18c0 fs/btrfs/ctree.c:505
 btrfs_cow_block+0x2e0/0x71c fs/btrfs/ctree.c:623
 btrfs_search_slot+0xa48/0x2380 fs/btrfs/ctree.c:-1
 btrfs_insert_empty_items+0xa4/0x180 fs/btrfs/ctree.c:4185
 btrfs_insert_empty_item fs/btrfs/ctree.h:3073 [inline]
 insert_balance_item+0x1c8/0x1154 fs/btrfs/volumes.c:3553
 btrfs_balance+0x7f8/0xdd4 fs/btrfs/volumes.c:4458
 btrfs_ioctl_balance+0x3c8/0x600 fs/btrfs/ioctl.c:4537
 btrfs_ioctl+0x95c/0xb38 fs/btrfs/ioctl.c:5594
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
Code: 17fffe9d 9793a99c d4210000 9793a99a (d4210000) 
---[ end trace 0000000000000000 ]---