------------[ cut here ]------------
len == 0
WARNING: block/bio.c:1044 at bio_add_page+0x516/0x700 block/bio.c:1044, CPU#0: udevd/5627
Modules linked in:
CPU: 0 UID: 0 PID: 5627 Comm: udevd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:bio_add_page+0x516/0x700 block/bio.c:1044
Code: 31 ed 44 89 e8 48 83 c4 50 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc e8 86 b2 30 fd 90 0f 0b 90 eb db e8 7b b2 30 fd 90 <0f> 0b 90 eb d0 e8 70 b2 30 fd 90 0f 0b 90 e9 76 fe ff ff e8 62 b2
RSP: 0018:ffffc90004a0f0d8 EFLAGS: 00010293
RAX: ffffffff8495b105 RBX: 0000000000000000 RCX: ffff88816d2c1dc0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 1ffff11020ef5792 R08: ffff8881077abcff R09: 1ffff11020ef579f
R10: dffffc0000000000 R11: ffffed1020ef57a0 R12: ffff8881077abc94
R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000
FS:  00007f1740f39c80(0000) GS:ffff88818dc0e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005641bf6c0b88 CR3: 00000001bbfcc000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 bio_add_folio+0x64/0x90 block/bio.c:1099
 do_mpage_readpage+0xd8c/0x1b40 fs/mpage.c:294
 mpage_readahead+0x3e7/0x800 fs/mpage.c:370
 read_pages+0x193/0x5a0 mm/readahead.c:174
 page_cache_ra_unbounded+0x754/0x9d0 mm/readahead.c:315
 do_page_cache_ra mm/readahead.c:348 [inline]
 force_page_cache_ra+0x26c/0x2e0 mm/readahead.c:378
 filemap_get_pages+0x560/0x21e0 mm/filemap.c:2708
 filemap_read+0x428/0x1730 mm/filemap.c:2841
 blkdev_read_iter+0x2f1/0x420 block/fops.c:830
 new_sync_read fs/read_write.c:493 [inline]
 vfs_read+0x595/0xa80 fs/read_write.c:574
 ksys_read+0x150/0x270 fs/read_write.c:716
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1740b16b6a
Code: 00 3d 00 00 41 00 75 0d 50 48 8d 3d 2d 08 0a 00 e8 ea 7d 01 00 31 c0 e9 07 ff ff ff 64 8b 04 25 18 00 00 00 85 c0 75 1b 0f 05 <48> 3d 00 f0 ff ff 76 6c 48 8b 15 8f a2 0d 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffe51f09b58 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f1740b16b6a
RDX: 0000000000000400 RSI: 00005641bf68db38 RDI: 0000000000000009
RBP: 0000000000000400 R08: 00005641bf68db10 R09: 0000000000000008
R10: 0000000000000051 R11: 0000000000000246 R12: 00005641bf68db10
R13: 00005641bf68db28 R14: 00005641bf690128 R15: 00005641bf6900d0
 </TASK>