el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x130 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
------------[ cut here ]------------
kernel BUG at fs/btrfs/extent-tree.c:3299!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 5103 Comm: syz.1.190 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/26/2026
pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : btrfs_free_tree_block+0xa50/0xa84 fs/btrfs/extent-tree.c:3299
lr : btrfs_free_tree_block+0xa50/0xa84 fs/btrfs/extent-tree.c:3299
sp : ffff800021117380
x29: ffff800021117480 x28: ffff700004222e78 x27: ffff000000000001
x26: ffff8000211173e0 x25: 00000000fffffff4 x24: ffff0000f6d2ead0
x23: 0000000000000001 x22: ffff000000000100 x21: ffff0000f6d2e9b8
x20: dfff800000000000 x19: ffff0000f6d2e9b0 x18: ffff800011b9bf60
x17: 0000000000000000 x16: ffff8000082d92bc x15: 0000000000000000
x14: 0000000000000001 x13: 1ffff00002a9af86 x12: 0000000000ff0100
x11: ff00800009f390f8 x10: 0000000000000000 x9 : ffff800009f390f8
x8 : ffff0000cf759bc0 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff800021116a58 x4 : 00000000ffffffff x3 : 0000000000000c40
x2 : ffff0000ccbd8f00 x1 : 00000000fffffff4 x0 : 0000000000000000
Call trace:
 btrfs_free_tree_block+0xa50/0xa84 fs/btrfs/extent-tree.c:3299
 btrfs_force_cow_block+0xb30/0x188c fs/btrfs/ctree.c:505
 btrfs_cow_block+0x2d0/0x708 fs/btrfs/ctree.c:623
 btrfs_search_slot+0xa50/0x237c fs/btrfs/ctree.c:-1
 btrfs_insert_empty_items+0xa4/0x178 fs/btrfs/ctree.c:4185
 btrfs_insert_empty_item fs/btrfs/ctree.h:3073 [inline]
 insert_balance_item+0x1c4/0x11c4 fs/btrfs/volumes.c:3553
 btrfs_balance+0x83c/0xe18 fs/btrfs/volumes.c:4458
 btrfs_ioctl_balance+0x3c0/0x5f8 fs/btrfs/ioctl.c:4529
 btrfs_ioctl+0x95c/0xb38 fs/btrfs/ioctl.c:5586
 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+0x98/0x2b4 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x130 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: 17fffe90 9795c92b d4210000 9795c929 (d4210000) 
---[ end trace 0000000000000000 ]---