KCSAN: data-race in loop_configure / loop

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in loop_configure / loop_configure (2) block				3	556d	593d	0/26	auto-obsoleted due to no activity on 2022/11/21 10:52

loop3: detected capacity change from 0 to 1 loop3: detected capacity change from 0 to 1 ================================================================== BUG: KCSAN: data-race in loop_configure / loop_configure read-write to 0xffff8881027bf144 of 1 bytes by task 22934 on cpu 1: dev_set_uevent_suppress include/linux/device.h:781 [inline] loop_configure+0x25b/0xc20 drivers/block/loop.c:1116 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+0x63/0xcd read-write to 0xffff8881027bf144 of 1 bytes by task 22929 on cpu 0: dev_set_uevent_suppress include/linux/device.h:781 [inline] loop_configure+0x25b/0xc20 drivers/block/loop.c:1116 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+0x63/0xcd value changed: 0x17 -> 0x07 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 22929 Comm: syz-executor.3 Not tainted 5.19.0-rc6-syzkaller-00364-g9b59ec8d50a1-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 ==================================================================