bisecting fixing commit since 56e337f2cf1326323844927a04e9dbce9a244835
building syzkaller on 9e8eaa75a18a5cf8102e862be692c0781759e51b
testing commit 56e337f2cf1326323844927a04e9dbce9a244835
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: e9a363522b7bc2f13771760b9ecff3c933b8d73a9de3d2eef41ecb878c7f92db
all runs: crashed: WARNING in iomap_iter
testing current HEAD 028192fea1de083f4f12bfb1eb7c4d7beb5c8ecd
testing commit 028192fea1de083f4f12bfb1eb7c4d7beb5c8ecd
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2
kernel signature: 8478187ff7bc35236e5310baaaa1fa034860ac61dc613a168e8e1489ecfd3646
all runs: crashed: WARNING in iomap_iter
revisions tested: 2, total time: 18m0.700098606s (build: 11m49.842571285s, test: 5m43.2912087s)
the crash still happens on HEAD
commit msg: Merge tag 'drm-fixes-2022-04-15' of git://anongit.freedesktop.org/drm/drm
crash: WARNING in iomap_iter
------------[ cut here ]------------
WARNING: CPU: 0 PID: 45 at fs/iomap/iter.c:33 iomap_iter_done fs/iomap/iter.c:35 [inline]
WARNING: CPU: 0 PID: 45 at fs/iomap/iter.c:33 iomap_iter+0xa08/0xee0 fs/iomap/iter.c:78
Modules linked in:
CPU: 0 PID: 45 Comm: kworker/u4:2 Not tainted 5.18.0-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+0xa08/0xee0 fs/iomap/iter.c:78
Code: 48 89 44 24 08 48 89 14 24 e8 44 ec d5 ff 48 8b 44 24 08 48 8b 14 24 e9 cb fb ff ff 0f 0b e9 ac fa ff ff 0f 0b e9 0b fa ff ff <0f> 0b e9 d0 f9 ff ff 0f 0b e9 f1 f9 ff ff e8 65 56 b7 06 85 c0 0f
RSP: 0018:ffffc90000d6f6c0 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: ffffc90000d6f858 RCX: 000000000000000c
RDX: 1ffff920001adf0c RSI: 1ffff920001adf12 RDI: ffffc90000d6f888
RBP: ffffc90000d6f890 R08: ffffc90000d6f638 R09: ffff88814c39c0c3
R10: ffffed1029873818 R11: 0000000000000005 R12: ffffc90000d6f880
R13: ffffc90000d6f8c8 R14: 00000fff80000000 R15: ffffffff80000000
FS:  0000000000000000(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd33e93398 CR3: 000000001ab6c000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __iomap_dio_rw+0x5dd/0x1750 fs/iomap/direct-io.c:590
 iomap_dio_rw+0x5/0x20 fs/iomap/direct-io.c:681
 ext4_dio_read_iter fs/ext4/file.c:79 [inline]
 ext4_file_read_iter+0x35d/0x4f0 fs/ext4/file.c:130
 call_read_iter include/linux/fs.h:2044 [inline]
 lo_rw_aio.isra.0+0x854/0xd80 drivers/block/loop.c:453
 do_req_filebacked drivers/block/loop.c:497 [inline]
 loop_handle_cmd drivers/block/loop.c:1870 [inline]
 loop_process_work+0x7d9/0x19c0 drivers/block/loop.c:1910
 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:298
 </TASK>