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kernel BUG at fs/btrfs/extent-tree.c:3299!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 5316 Comm: syz.4.172 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 : ffff8000210567c0
x29: ffff8000210568c0 x28: ffff70000420ad00 x27: ffff000000000002
x26: ffff800021056820 x25: 00000000fffffff4 x24: ffff0000de5648e0
x23: 0000000000000001 x22: ffff000000000100 x21: ffff0000de5647c8
x20: dfff800000000000 x19: ffff0000de5647c0 x18: 0000000000000000
x17: ffff80001835b000 x16: ffff8000082d92bc x15: ffff8000089a8504
x14: 0000000000000001 x13: 1ffff00002b4e872 x12: 0000000000ff0100
x11: ff00800009f39adc x10: 0000000000000000 x9 : ffff800009f39adc
x8 : ffff0000d14e1bc0 x7 : ffff80000805983c x6 : ffff800008059a4c
x5 : ffff0000cc32b730 x4 : ffff800021056478 x3 : 0000000000000000
x2 : 0000000000000006 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
 lookup_inline_extent_backref+0x28c/0xe74 fs/btrfs/extent-tree.c:847
 lookup_extent_backref fs/btrfs/extent-tree.c:1074 [inline]
 __btrfs_free_extent+0x228/0x22ac fs/btrfs/extent-tree.c:2984
 run_delayed_tree_ref fs/btrfs/extent-tree.c:1696 [inline]
 run_one_delayed_ref fs/btrfs/extent-tree.c:1720 [inline]
 btrfs_run_delayed_refs_for_head fs/btrfs/extent-tree.c:1969 [inline]
 __btrfs_run_delayed_refs+0xbb4/0x32f4 fs/btrfs/extent-tree.c:2032
 btrfs_run_delayed_refs+0x124/0x46c fs/btrfs/extent-tree.c:2163
 btrfs_commit_transaction+0x1f8/0x2884 fs/btrfs/transaction.c:2191
 try_flush_qgroup+0x238/0x314 fs/btrfs/qgroup.c:3783
 btrfs_qgroup_reserve_data+0x98/0xec fs/btrfs/qgroup.c:3864
 btrfs_check_data_free_space+0x12c/0x208 fs/btrfs/delalloc-space.c:152
 btrfs_buffered_write+0x3b0/0xe04 fs/btrfs/file.c:1240
 btrfs_do_write_iter+0x354/0x10ac fs/btrfs/file.c:1684
 btrfs_file_write_iter+0x2c/0x3c fs/btrfs/file.c:1705
 call_write_iter include/linux/fs.h:2265 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x3ec/0x7f0 fs/read_write.c:584
 ksys_write+0x12c/0x224 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __arm64_sys_write+0x7c/0x90 fs/read_write.c:646
 __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 9795c6d2 d4210000 9795c6d0 (d4210000) 
---[ end trace 0000000000000000 ]---