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kernel BUG at fs/btrfs/extent-tree.c:3300!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 4408 Comm: syz.1.2 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026
pstate: 62400005 (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 : ffff800020f173c0
x29: ffff800020f174c0 x28: dfff800000000000 x27: ffff7000041e2e80
x26: ffff000000000001 x25: ffff800020f17420 x24: 00000000fffffff4
x23: 0000000000000001 x22: ffff000000000100 x21: ffff0000dd2bed98
x20: ffff0000dfe1d2a0 x19: ffff0000dd2bed90 x18: 1fffe00033e6db7e
x17: 0000000000000000 x16: ffff800011bb65f8 x15: 0000000000000002
x14: 0000000000000001 x13: 1ffff00002acf01a x12: 0000000000080000
x11: 000000000007ffff x10: ffff8000247e9000 x9 : ffff800009fc86f8
x8 : 0000000000080000 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff800020f16a98 x4 : 00000000ffffffff x3 : 0000000000000c40
x2 : ffff0000cbc5c180 x1 : 00000000fffffff4 x0 : 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) 
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