================================================================== BUG: KCSAN: data-race in bdev_disk_changed / set_capacity_and_notify write to 0xffff88810279e6c8 of 8 bytes by task 12154 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 0xffff88810279e6c8 of 8 bytes by task 25363 on cpu 1: bdev_nr_sectors include/linux/blkdev.h:794 [inline] get_capacity include/linux/blkdev.h:804 [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: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+0x46/0xb0 value changed: 0x0000000000000000 -> 0x000000000000010d Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 25363 Comm: udevd Not tainted 5.19.0-rc4-syzkaller-00208-g69cb6c6556ad-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 ================================================================== I/O error, dev loop3, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0 Buffer I/O error on dev loop3, logical block 0, async page read