------------[ cut here ]------------
WARNING: CPU: 0 PID: 144 at fs/btrfs/block-group.c:3509 do_chunk_alloc fs/btrfs/block-group.c:3509 [inline]
WARNING: CPU: 0 PID: 144 at fs/btrfs/block-group.c:3509 btrfs_chunk_alloc+0xbd8/0x1010 fs/btrfs/block-group.c:3732
Modules linked in:
CPU: 0 PID: 144 Comm: kworker/u4:1 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: events_unbound btrfs_async_reclaim_metadata_space
RIP: 0010:do_chunk_alloc fs/btrfs/block-group.c:3509 [inline]
RIP: 0010:btrfs_chunk_alloc+0xbd8/0x1010 fs/btrfs/block-group.c:3732
Code: 00 e8 2c 9c 13 fe 48 8b 1c 24 0f 1f 44 00 00 e8 1e 9c 13 fe eb 16 e8 17 9c 13 fe 48 c7 c7 40 1b 6d 8a 44 89 ee e8 58 f4 4b 06 <0f> 0b 4c 89 e7 48 c7 c6 40 29 6d 8a ba b5 0d 00 00 eb 76 e8 f0 9b
RSP: 0018:ffffc9000171eb70 EFLAGS: 00010246
RAX: b2f25eaf06fb4a00 RBX: ffff888019b87000 RCX: ffff88801c050000
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000000000004 R08: ffff8880b902795b R09: 1ffff11017204f2b
R10: dffffc0000000000 R11: ffffed1017204f2c R12: ffff888073a98580
R13: ffffffffffffffe4 R14: dffffc0000000000 R15: ffff888073a985cb
FS:  0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b10b2a1010 CR3: 0000000072667000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 find_free_extent_update_loop fs/btrfs/extent-tree.c:4054 [inline]
 find_free_extent+0x2c26/0x3610 fs/btrfs/extent-tree.c:4417
 btrfs_reserve_extent+0x20a/0x530 fs/btrfs/extent-tree.c:4498
 cow_file_range+0x5e5/0xb40 fs/btrfs/inode.c:1181
 btrfs_run_delalloc_range+0x292/0x14b0 fs/btrfs/inode.c:2018
 writepage_delalloc+0x152/0x370 fs/btrfs/extent_io.c:3809
 __extent_writepage+0x52f/0xb10 fs/btrfs/extent_io.c:4115
 extent_write_cache_pages fs/btrfs/extent_io.c:5037 [inline]
 extent_writepages+0xa0e/0x1400 fs/btrfs/extent_io.c:5164
 do_writepages+0x476/0x6e0 mm/page-writeback.c:2386
 filemap_fdatawrite_wbc+0x1eb/0x240 mm/filemap.c:400
 start_delalloc_inodes+0x72b/0xb40 fs/btrfs/inode.c:10142
 btrfs_start_delalloc_roots+0x5a0/0x840 fs/btrfs/inode.c:10221
 shrink_delalloc fs/btrfs/space-info.c:538 [inline]
 flush_space+0x58c/0xc70 fs/btrfs/space-info.c:646
 btrfs_async_reclaim_metadata_space+0x26f/0x330 fs/btrfs/space-info.c:953
 process_one_work+0x85f/0x1010 kernel/workqueue.c:2310
 worker_thread+0xaa6/0x1290 kernel/workqueue.c:2457
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>