==================================================================
BUG: KCSAN: data-race in __bio_queue_enter / blk_mq_unfreeze_queue

read-write to 0xffff888102639e2c of 4 bytes by task 24300 on cpu 0:
 __blk_mq_unfreeze_queue block/blk-mq.c:224 [inline]
 blk_mq_unfreeze_queue+0x34/0xb0 block/blk-mq.c:235
 __loop_clr_fd+0x4b6/0x640 drivers/block/loop.c:1154
 loop_clr_fd drivers/block/loop.c:1230 [inline]
 lo_ioctl+0xa12/0x11b0 drivers/block/loop.c:1556
 blkdev_ioctl+0x20e/0x440 block/ioctl.c:588
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:856
 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888102639e2c of 4 bytes by task 5775 on cpu 1:
 __bio_queue_enter+0x1ea/0x500 block/blk-core.c:399
 bio_queue_enter block/blk.h:81 [inline]
 blk_mq_get_new_requests block/blk-mq.c:2744 [inline]
 blk_mq_submit_bio+0x476/0xe40 block/blk-mq.c:2831
 __submit_bio+0x130/0x330 block/blk-core.c:666
 __submit_bio_noacct_mq block/blk-core.c:743 [inline]
 submit_bio_noacct_nocheck+0x3cb/0x480 block/blk-core.c:760
 submit_bio_noacct+0x6c4/0x820 block/blk-core.c:867
 submit_bio+0x139/0x150
 mpage_bio_submit fs/mpage.c:64 [inline]
 mpage_readahead+0x3ab/0x3f0 fs/mpage.c:360
 blkdev_readahead+0x18/0x20 block/fops.c:397
 read_pages+0xa0/0x7c0 mm/readahead.c:157
 page_cache_ra_unbounded+0x2a8/0x2e0 mm/readahead.c:261
 do_page_cache_ra mm/readahead.c:291 [inline]
 force_page_cache_ra+0x1c6/0x200 mm/readahead.c:322
 page_cache_sync_ra+0x190/0x1b0 mm/readahead.c:688
 page_cache_sync_readahead include/linux/pagemap.h:1185 [inline]
 filemap_get_pages mm/filemap.c:2592 [inline]
 filemap_read+0x3e5/0x1400 mm/filemap.c:2679
 blkdev_read_iter+0x2c6/0x370 block/fops.c:611
 call_read_iter include/linux/fs.h:2044 [inline]
 new_sync_read fs/read_write.c:401 [inline]
 vfs_read+0x5a5/0x6a0 fs/read_write.c:482
 ksys_read+0xe8/0x1a0 fs/read_write.c:620
 __do_sys_read fs/read_write.c:630 [inline]
 __se_sys_read fs/read_write.c:628 [inline]
 __x64_sys_read+0x3e/0x50 fs/read_write.c:628
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000001 -> 0x00000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 5775 Comm: udevd Not tainted 5.18.0-rc3-syzkaller-00080-gd569e86915b7-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================
I/O error, dev loop0, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
I/O error, dev loop0, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev loop0, logical block 0, async page read
I/O error, dev loop0, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
I/O error, dev loop0, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
I/O error, dev loop0, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
blk_print_req_error: 28 callbacks suppressed
I/O error, dev loop0, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
I/O error, dev loop0, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev loop0, logical block 0, async page read
I/O error, dev loop0, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
I/O error, dev loop0, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev loop0, logical block 0, async page read
I/O error, dev loop0, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
I/O error, dev loop0, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
I/O error, dev loop1, sector 147584 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
blk_print_req_error: 15 callbacks suppressed
I/O error, dev loop1, sector 147584 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
I/O error, dev loop1, sector 147584 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev loop1, logical block 18448, async page read