BUG: KCSAN: data-race in bdev_disk_changed / set_capacity_and_notify

write to 0xffff8881027a86c8 of 8 bytes by task 671 on cpu 0:
 set_capacity block/genhd.c:64 [inline]
 set_capacity_and_notify+0xab/0x1d0 block/genhd.c:78
 loop_set_size+0x2e/0x70 drivers/block/loop.c:237
 loop_configure+0xb1b/0xc20 drivers/block/loop.c:1095
 lo_ioctl+0x641/0x1290
 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 0xffff8881027a86c8 of 8 bytes by task 13594 on cpu 1:
 bdev_nr_sectors include/linux/blkdev.h:793 [inline]
 get_capacity include/linux/blkdev.h:803 [inline]
 bdev_disk_changed+0x1b9/0xc30 block/partitions/core.c:685
 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:3527 [inline]
 path_openat+0x16cf/0x1b30 fs/namei.c:3660
 do_filp_open+0x105/0x220 fs/namei.c:3687
 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+0x46/0xb0

value changed: 0x0000000000000000 -> 0x0000000000040800

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 13594 Comm: udevd Not tainted 5.18.0-syzkaller-13760-g032dcf09e2bf-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 loop1, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev loop1, logical block 0, async page read
 loop1: unable to read partition table
loop1: partition table beyond EOD, truncated
I/O error, dev loop1, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev loop1, logical block 0, async page read
 loop1: unable to read partition table
loop1: partition table beyond EOD, truncated
I/O error, dev loop1, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev loop1, logical block 0, async page read
 loop1: unable to read partition table
loop1: partition table beyond EOD, truncated