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

read-write to 0xffff888102668bec of 4 bytes by task 14712 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+0x63/0xcd

read to 0xffff888102668bec of 4 bytes by task 14728 on cpu 1:
 __bio_queue_enter+0x1ea/0x500 block/blk-core.c:382
 bio_queue_enter block/blk.h:81 [inline]
 blk_mq_get_new_requests block/blk-mq.c:2727 [inline]
 blk_mq_submit_bio+0x421/0xe50 block/blk-mq.c:2819
 __submit_bio block/blk-core.c:648 [inline]
 __submit_bio_noacct_mq block/blk-core.c:725 [inline]
 submit_bio_noacct_nocheck+0x83d/0xaa0 block/blk-core.c:742
 submit_bio_noacct+0x690/0x7f0 block/blk-core.c:849
 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:3524
 do_read_cache_page mm/filemap.c:3602 [inline]
 read_cache_page+0x37/0x170 mm/filemap.c:3611
 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
 blkdev_open+0xac/0x140 block/fops.c:481
 do_dentry_open+0x521/0x850 fs/open.c:848
 vfs_open+0x43/0x50 fs/open.c:981
 do_open fs/namei.c:3520 [inline]
 path_openat+0x16cf/0x1b30 fs/namei.c:3653
 do_filp_open+0x105/0x220 fs/namei.c:3680
 do_sys_openat2+0xb5/0x2a0 fs/open.c:1278
 do_sys_open fs/open.c:1294 [inline]
 __do_sys_openat fs/open.c:1310 [inline]
 __se_sys_openat fs/open.c:1305 [inline]
 __x64_sys_openat+0xef/0x110 fs/open.c:1305
 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+0x63/0xcd

value changed: 0x00000001 -> 0x00000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 14728 Comm: syz-executor.4 Not tainted 5.19.0-rc6-syzkaller-00269-g9bd572ec7a66-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022
==================================================================
I/O error, dev loop4, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
buffer_io_error: 50 callbacks suppressed
Buffer I/O error on dev loop4, logical block 0, async page read
 loop4: unable to read partition table
loop4: partition table beyond EOD, 
truncated
ext3: Bad value for 'barrier'
syz-executor.4 (14728) used greatest stack depth: 10224 bytes left