WARNING in iomap

WARNING in iomap_iter
Status: upstream: reported on 2021/11/08 23:46
Reported-by: syzbot+a8e049cd3abd342936b6@syzkaller.appspotmail.com
First crash: 32d, last: 8d22h

Sample crash report:

------------[ cut here ]------------
WARNING: CPU: 0 PID: 3471 at fs/iomap/iter.c:33 iomap_iter_done fs/iomap/iter.c:33 [inline]
WARNING: CPU: 0 PID: 3471 at fs/iomap/iter.c:33 iomap_iter+0xdcf/0x11b0 fs/iomap/iter.c:78
Modules linked in:
CPU: 1 PID: 3471 Comm: kworker/u4:15 Not tainted 5.16.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: loop0 loop_rootcg_workfn
RIP: 0010:iomap_iter_done fs/iomap/iter.c:33 [inline]
RIP: 0010:iomap_iter+0xdcf/0x11b0 fs/iomap/iter.c:78
Code: fd ff ff e8 d3 99 d1 ff e9 f9 f9 ff ff e8 c9 dc 8a ff 0f 0b e9 85 f8 ff ff e8 bd dc 8a ff 0f 0b e9 96 f7 ff ff e8 b1 dc 8a ff <0f> 0b e9 f8 f6 ff ff e8 a5 dc 8a ff 0f 0b 48 b8 00 00 00 00 00 fc
RSP: 0018:ffffc90015a17680 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffffc90015a17818 RCX: 0000000000000000
RDX: ffff88809bed0000 RSI: ffffffff81ecbcaf RDI: 0000000000000003
RBP: ffffc90015a17848 R08: 00000fff80000000 R09: 000000000000000c
R10: ffffffff81ecb3a0 R11: 000000000000003f R12: ffffc90015a17820
R13: ffffffff80000000 R14: ffffc90015a17840 R15: ffffc90015a17888
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000032092000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __iomap_dio_rw+0x6b2/0x1a10 fs/iomap/direct-io.c:588
 iomap_dio_rw+0x38/0x90 fs/iomap/direct-io.c:679
 ext4_dio_read_iter fs/ext4/file.c:77 [inline]
 ext4_file_read_iter+0x41c/0x5d0 fs/ext4/file.c:128
 call_read_iter include/linux/fs.h:2156 [inline]
 lo_rw_aio.isra.0+0xa99/0xc90 drivers/block/loop.c:453
 do_req_filebacked drivers/block/loop.c:497 [inline]
 loop_handle_cmd drivers/block/loop.c:1857 [inline]
 loop_process_work+0x92f/0x1db0 drivers/block/loop.c:1897
 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>

Crashes (4):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci-upstream-kasan-gce	2021/11/24 17:40	upstream	5d9f4cf36721	545ab074	.config	log	report	info	WARNING in iomap_iter
ci-qemu-upstream-386	2021/11/12 13:45	upstream	5833291ab6de	75b04091	.config	log	report	info	WARNING in iomap_iter
ci-upstream-kasan-gce-386	2021/11/04 23:43	upstream	7ddb58cb0eca	4c1be0be	.config	log	report	info	WARNING in iomap_iter
ci-upstream-linux-next-kasan-gce-root	2021/11/28 05:40	linux-next	f81e94e91878	63eeac02	.config	log	report	info	WARNING in iomap_iter