==================================================================
BUG: KCSAN: data-race in kobject_uevent_env / loop_configure
read to 0xffff8881027b0784 of 1 bytes by task 16032 on cpu 0:
kobject_uevent_env+0xaf/0x580 lib/kobject_uevent.c:496
disk_event_uevent block/disk-events.c:181 [inline]
disk_force_media_change+0xe3/0x180 block/disk-events.c:305
loop_configure+0x730/0xc20 drivers/block/loop.c:1065
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-write to 0xffff8881027b0784 of 1 bytes by task 16030 on cpu 1:
dev_set_uevent_suppress include/linux/device.h:781 [inline]
loop_configure+0x128/0xc20 drivers/block/loop.c:1009
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
value changed: 0x17 -> 0x07
Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 16030 Comm: syz-executor.4 Not tainted 5.19.0-rc2-syzkaller-00205-g462abc9de7a1-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================
I/O error, dev loop4, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
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
I/O error, dev loop4, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
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