==================================================================
BUG: KCSAN: data-race in loop_configure / loop_queue_rq

write to 0xffff88813cc97878 of 4 bytes by task 17618 on cpu 0:
 loop_configure+0xb08/0xc20
 lo_ioctl+0x688/0x12f0
 blkdev_ioctl+0x3a4/0x490
 __se_sys_ioctl+0xc9/0x140
 __x64_sys_ioctl+0x43/0x50
 do_syscall_64+0x41/0xc0
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff88813cc97878 of 4 bytes by task 6384 on cpu 1:
 loop_queue_rq+0x4f/0x650
 __blk_mq_try_issue_directly+0x2ba/0x420
 blk_mq_plug_issue_direct+0x14e/0x610
 blk_mq_flush_plug_list+0x2f1/0x670
 __blk_flush_plug+0x223/0x280
 blk_finish_plug+0x47/0x60
 read_pages+0x4e5/0x560
 page_cache_ra_unbounded+0x2a9/0x2e0
 page_cache_sync_ra+0x251/0x2a0
 filemap_read+0x416/0x1530
 blkdev_read_iter+0x2ca/0x370
 vfs_read+0x39a/0x560
 ksys_read+0xeb/0x1a0
 __x64_sys_read+0x42/0x50
 do_syscall_64+0x41/0xc0
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00000000 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 6384 Comm: udevd Tainted: G        W          6.2.0-rc7-syzkaller-00013-g513c1a3d3f19-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
==================================================================
I/O error, dev loop4, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 2
udevd[6384]: inotify_add_watch(7, /dev/loop0, 10) failed: No such file or directory
I/O error, dev loop4, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 2
I/O error, dev loop4, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 2
I/O error, dev loop4, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 2