BTRFS error (device loop0): bad tree block start, want 30490624 have 0
==================================================================
BUG: KASAN: use-after-free in copy_page_from_iter_atomic+0xb95/0x1560 lib/iov_iter.c:969
Read of size 4096 at addr ffff88817db41000 by task kworker/u4:0/8

CPU: 1 PID: 8 Comm: kworker/u4:0 Not tainted 5.19.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: loop0 loop_workfn
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x57/0x7d lib/dump_stack.c:106
 print_address_description.constprop.0.cold+0xeb/0x495 mm/kasan/report.c:313
 print_report mm/kasan/report.c:429 [inline]
 kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491
 check_region_inline mm/kasan/generic.c:183 [inline]
 kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189
 memcpy+0x20/0x60 mm/kasan/shadow.c:65
 copy_page_from_iter_atomic+0xb95/0x1560 lib/iov_iter.c:969
 generic_perform_write+0x25f/0x480 mm/filemap.c:3777
 __generic_file_write_iter+0x20e/0x400 mm/filemap.c:3897
 generic_file_write_iter+0xb9/0x1c0 mm/filemap.c:3929
 call_write_iter include/linux/fs.h:2058 [inline]
 do_iter_readv_writev+0x2b4/0x5b0 fs/read_write.c:742
 do_iter_write+0x124/0x620 fs/read_write.c:868
 lo_write_bvec drivers/block/loop.c:249 [inline]
 lo_write_simple drivers/block/loop.c:271 [inline]
 do_req_filebacked drivers/block/loop.c:495 [inline]
 loop_handle_cmd drivers/block/loop.c:1859 [inline]
 loop_process_work+0xb4f/0x1b90 drivers/block/loop.c:1894
 process_one_work+0x865/0x13d0 kernel/workqueue.c:2289
 worker_thread+0x598/0xec0 kernel/workqueue.c:2436
 kthread+0x299/0x340 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302
 </TASK>

The buggy address belongs to the physical page:
page:ffffea0005f6d040 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x17db41
flags: 0x57ff00000000000(node=1|zone=2|lastcpupid=0x7ff)
raw: 057ff00000000000 ffffea0005f6d048 ffffea0005f6d048 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner info is not present (never set?)

Memory state around the buggy address:
 ffff88817db40f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88817db40f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88817db41000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff88817db41080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88817db41100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================