kworker/u4:6: attempt to access beyond end of device
loop0: rw=67112961, sector=10480, nr_sectors = 8 limit=64
BTRFS error (device loop0): bdev /dev/loop0 errs: wr 1, rd 0, flush 0, corrupt 0, gen 0
kworker/u4:6: attempt to access beyond end of device
loop0: rw=67112961, sector=10488, nr_sectors = 8 limit=64
BTRFS error (device loop0): bdev /dev/loop0 errs: wr 3, rd 0, flush 0, corrupt 0, gen 0
kworker/u4:6: attempt to access beyond end of device
loop0: rw=67112961, sector=10496, nr_sectors = 8 limit=64
BTRFS error (device loop0): bdev /dev/loop0 errs: wr 4, rd 0, flush 0, corrupt 0, gen 0
assertion failed: block_start != EXTENT_MAP_HOLE, in fs/btrfs/extent_io.c:1721
------------[ cut here ]------------
kernel BUG at fs/btrfs/extent_io.c:1721!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 161 Comm: kworker/u4:6 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Workqueue: writeback wb_workfn (flush-btrfs-1)
RIP: 0010:submit_one_sector fs/btrfs/extent_io.c:1721 [inline]
RIP: 0010:extent_writepage_io+0x1070/0x11a0 fs/btrfs/extent_io.c:1826
Code: 27 fd 90 0f 0b e8 d0 6f c6 fd 48 c7 c7 20 c6 17 8c 48 c7 c6 40 dd 17 8c 48 c7 c2 a0 c6 17 8c b9 b9 06 00 00 e8 a1 ad 27 fd 90 <0f> 0b e8 a9 6f c6 fd 48 89 ef 48 c7 c6 00 ce 17 8c e8 aa 0c 28 fd
RSP: 0000:ffffc900016eed40 EFLAGS: 00010246
RAX: 000000000000004e RBX: ffffea00014ea808 RCX: 682b31df1f43f500
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffea00014ea800 R08: ffffc900016eeac7 R09: 1ffff920002ddd58
R10: dffffc0000000000 R11: fffff520002ddd59 R12: 0000000000001000
R13: dffffc0000000000 R14: ffff88801f706398 R15: fffffffffffffffd
FS:  0000000000000000(0000) GS:ffff88808c815000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f347c85a000 CR3: 000000001bfeb000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 extent_writepage fs/btrfs/extent_io.c:1936 [inline]
 extent_write_cache_pages fs/btrfs/extent_io.c:2593 [inline]
 btrfs_writepages+0x17a1/0x28b0 fs/btrfs/extent_io.c:2725
 do_writepages+0x338/0x560 mm/page-writeback.c:2571
 __writeback_single_inode+0x12e/0xf90 fs/fs-writeback.c:1787
 writeback_sb_inodes+0x9de/0x1b00 fs/fs-writeback.c:2079
 __writeback_inodes_wb+0x114/0x240 fs/fs-writeback.c:2155
 wb_writeback+0x42f/0xad0 fs/fs-writeback.c:2266
 wb_check_start_all fs/fs-writeback.c:2392 [inline]
 wb_do_writeback fs/fs-writeback.c:2439 [inline]
 wb_workfn+0x980/0x10f0 fs/fs-writeback.c:2477
 process_one_work kernel/workqueue.c:3322 [inline]
 process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:submit_one_sector fs/btrfs/extent_io.c:1721 [inline]
RIP: 0010:extent_writepage_io+0x1070/0x11a0 fs/btrfs/extent_io.c:1826
Code: 27 fd 90 0f 0b e8 d0 6f c6 fd 48 c7 c7 20 c6 17 8c 48 c7 c6 40 dd 17 8c 48 c7 c2 a0 c6 17 8c b9 b9 06 00 00 e8 a1 ad 27 fd 90 <0f> 0b e8 a9 6f c6 fd 48 89 ef 48 c7 c6 00 ce 17 8c e8 aa 0c 28 fd
RSP: 0000:ffffc900016eed40 EFLAGS: 00010246
RAX: 000000000000004e RBX: ffffea00014ea808 RCX: 682b31df1f43f500
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffea00014ea800 R08: ffffc900016eeac7 R09: 1ffff920002ddd58
R10: dffffc0000000000 R11: fffff520002ddd59 R12: 0000000000001000
R13: dffffc0000000000 R14: ffff88801f706398 R15: fffffffffffffffd
FS:  0000000000000000(0000) GS:ffff88808c815000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7ef055efb3 CR3: 000000001bfeb000 CR4: 0000000000352ef0