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

read-write to 0xffff88810172151c of 4 bytes by task 22532 on cpu 0:
 __blk_mq_unfreeze_queue block/blk-mq.c:225 [inline]
 blk_mq_unfreeze_queue+0x34/0xb0 block/blk-mq.c:236
 __loop_clr_fd+0x244/0x3c0 drivers/block/loop.c:1167
 loop_clr_fd drivers/block/loop.c:1252 [inline]
 lo_ioctl+0xd8c/0x1290 drivers/block/loop.c:1558
 blkdev_ioctl+0x20e/0x440 block/ioctl.c:614
 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+0x46/0xb0

read to 0xffff88810172151c of 4 bytes by task 1445 on cpu 1:
 __bio_queue_enter+0x1ea/0x500 block/blk-core.c:395
 bio_queue_enter block/blk.h:81 [inline]
 blk_mq_get_new_requests block/blk-mq.c:2739 [inline]
 blk_mq_submit_bio+0x476/0xe40 block/blk-mq.c:2826
 __submit_bio block/blk-core.c:661 [inline]
 __submit_bio_noacct_mq block/blk-core.c:738 [inline]
 submit_bio_noacct_nocheck+0x83d/0xaa0 block/blk-core.c:755
 submit_bio_noacct+0x690/0x7f0 block/blk-core.c:862
 submit_bio+0xfb/0x110
 submit_bh_wbc+0x2a8/0x2f0 fs/buffer.c:3039
 submit_bh fs/buffer.c:3045 [inline]
 block_read_full_folio+0x4d6/0x560 fs/buffer.c:2337
 blkdev_read_folio+0x18/0x20 block/fops.c:377
 do_read_cache_folio+0x20f/0x3a0 mm/filemap.c:3514
 do_read_cache_page mm/filemap.c:3592 [inline]
 read_cache_page+0x37/0x170 mm/filemap.c:3601
 read_mapping_page include/linux/pagemap.h:759 [inline]
 read_part_sector+0x78/0x2f0 block/partitions/core.c:715
 read_lba block/partitions/efi.c:248 [inline]
 find_valid_gpt+0x1e7/0xcb0 block/partitions/efi.c:603
 efi_partition+0xba/0x6e0 block/partitions/efi.c:720
 check_partition block/partitions/core.c:147 [inline]
 blk_add_partitions block/partitions/core.c:600 [inline]
 bdev_disk_changed+0x3c5/0xc30 block/partitions/core.c:686
 blkdev_get_whole block/bdev.c:686 [inline]
 blkdev_get_by_dev+0x3c0/0x9c0 block/bdev.c:823
 disk_scan_partitions+0xc0/0xf0 block/genhd.c:394
 blkdev_common_ioctl+0xd88/0x12e0 block/ioctl.c:530
 blkdev_ioctl+0x1a7/0x440 block/ioctl.c:608
 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+0x46/0xb0

value changed: 0x00000001 -> 0x00000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 1445 Comm: udevd Not tainted 5.18.0-syzkaller-13842-g952923ddc011-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================
I/O error, dev loop2, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev loop2, logical block 0, async page read
 loop2: unable to read partition table
loop2: partition table beyond EOD, truncated
I/O error, dev loop2, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev loop2, logical block 0, async page read
 loop2: unable to read partition table
loop2: partition table beyond EOD, truncated
I/O error, dev loop2, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev loop2, logical block 0, async page read
 loop2: unable to read partition table
loop2: partition table beyond EOD, truncated
I/O error, dev loop2, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev loop2, logical block 0, async page read
 loop2: unable to read partition table
loop2: partition table beyond EOD, truncated
I/O error, dev loop2, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev loop2, logical block 0, async page read
 loop2: unable to read partition table
loop2: partition table beyond EOD, truncated
I/O error, dev loop2, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev loop2, logical block 0, async page read
 loop2: unable to read partition table
loop2: partition table beyond EOD, truncated
I/O error, dev loop2, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev loop2, logical block 0, async page read
 loop2: unable to read partition table
loop2: partition table beyond EOD, truncated
I/O error, dev loop2, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev loop2, logical block 0, async page read
 loop2: unable to read partition table
loop2: partition table beyond EOD, truncated
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
 loop0: unable to read partition table
loop0: partition table beyond EOD, truncated