el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 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: 5157 Comm: syz.3.73 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : btrfs_free_tree_block+0x9e4/0xa1c fs/btrfs/extent-tree.c:3299
lr : btrfs_free_tree_block+0x9e4/0xa1c fs/btrfs/extent-tree.c:3299
sp : ffff8000211d7160
x29: ffff8000211d7260 x28: ffff0000c3cb23e0 x27: ffff000000000001
x26: ffff8000211d71c0 x25: 00000000fffffff4 x24: ffff0000c3cb2500
x23: 0000000000000001 x22: 1fffe000187964a0 x21: ffff0000c3cb23e8
x20: dfff800000000000 x19: ffff0000c3cb23e0 x18: ffff800011abbcc0
x17: 0000000000000000 x16: ffff8000082d22e0 x15: 0000000000000000
x14: 00000000ffffffff x13: 0000000000000001 x12: 0000000000ff0100
x11: ff00800009f015c0 x10: 0000000000000000 x9 : ffff800009f015c0
x8 : ffff0000dc1e0000 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff8000211d6838 x4 : 00000000ffffffff x3 : 0000000000000c40
x2 : ffff0000d6cefc80 x1 : 00000000fffffff4 x0 : 0000000000000000
Call trace:
 btrfs_free_tree_block+0x9e4/0xa1c fs/btrfs/extent-tree.c:3299
 btrfs_force_cow_block+0xb20/0x187c fs/btrfs/ctree.c:505
 btrfs_cow_block+0x2d0/0x710 fs/btrfs/ctree.c:623
 commit_cowonly_roots+0x134/0x714 fs/btrfs/transaction.c:1289
 btrfs_commit_transaction+0x10bc/0x29f0 fs/btrfs/transaction.c:2427
 btrfs_sync_fs+0x530/0xa30 fs/btrfs/super.c:1535
 sync_filesystem+0x1a0/0x218 fs/sync.c:66
 btrfs_remount+0x19c/0x1148 fs/btrfs/super.c:2006
 legacy_reconfigure+0xf8/0x110 fs/fs_context.c:655
 reconfigure_super+0x1d4/0x79c fs/super.c:977
 do_remount fs/namespace.c:2732 [inline]
 path_mount+0xbd4/0xe78 fs/namespace.c:3391
 do_mount fs/namespace.c:3412 [inline]
 __do_sys_mount fs/namespace.c:3620 [inline]
 __se_sys_mount fs/namespace.c:3597 [inline]
 __arm64_sys_mount+0x49c/0x584 fs/namespace.c:3597
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 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: 17fffea4 979680b9 d4210000 979680b7 (d4210000) 
---[ end trace 0000000000000000 ]---