================================================================== BUG: KCSAN: data-race in has_bh_in_lru / invalidate_bh_lrus_cpu write to 0xffff888237d28398 of 8 bytes by task 19 on cpu 1: __invalidate_bh_lrus fs/buffer.c:1393 [inline] invalidate_bh_lrus_cpu+0xad/0xe0 fs/buffer.c:1438 lru_add_and_bh_lrus_drain mm/swap.c:732 [inline] lru_add_drain_per_cpu+0x4e/0x60 mm/swap.c:749 process_one_work+0x3f6/0x960 kernel/workqueue.c:2307 worker_thread+0x616/0xa70 kernel/workqueue.c:2454 kthread+0x1bf/0x1e0 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 read to 0xffff888237d28398 of 8 bytes by task 9294 on cpu 0: has_bh_in_lru+0x31/0x1c0 fs/buffer.c:1415 smp_call_function_many_cond+0x29b/0x6c0 kernel/smp.c:917 on_each_cpu_cond_mask+0x3b/0x80 kernel/smp.c:1135 on_each_cpu_cond include/linux/smp.h:105 [inline] invalidate_bh_lrus+0x26/0x30 fs/buffer.c:1424 invalidate_bdev+0x51/0x80 block/bdev.c:86 invalidate_disk+0x25/0xb0 block/genhd.c:651 __loop_clr_fd+0x3d1/0x5d0 drivers/block/loop.c:1142 loop_clr_fd drivers/block/loop.c:1231 [inline] lo_ioctl+0xa33/0x1280 drivers/block/loop.c:1558 blkdev_ioctl+0x20e/0x440 block/ioctl.c:588 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:860 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0xffff8881341ba208 -> 0x0000000000000000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 9294 Comm: syz-executor.2 Not tainted 5.17.0-rc2-syzkaller-00064-gc36c04c2e132 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================