================================================================== BUG: KCSAN: data-race in exit_signals / kthread_unpark write to 0xffff888129f3402c of 4 bytes by task 11353 on cpu 1: exit_signals+0xe1/0x4a0 kernel/signal.c:2873 do_exit+0x194/0x1560 kernel/exit.c:781 kthread+0x1d8/0x1f0 kernel/kthread.c:294 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 read to 0xffff888129f3402c of 4 bytes by task 1805 on cpu 0: to_kthread kernel/kthread.c:83 [inline] kthread_unpark+0x1f/0x150 kernel/kthread.c:536 kthread_stop+0xa6/0x250 kernel/kthread.c:619 loop_unprepare_queue drivers/block/loop.c:926 [inline] __loop_clr_fd+0x4d1/0x650 drivers/block/loop.c:1257 loop_clr_fd drivers/block/loop.c:1336 [inline] lo_ioctl+0x9eb/0x11f0 drivers/block/loop.c:1694 blkdev_ioctl+0x1d0/0x3c0 block/ioctl.c:583 block_ioctl+0x6d/0x80 fs/block_dev.c:1671 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:739 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:739 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 1805 Comm: syz-executor.4 Not tainted 5.12.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================