================================================================== BUG: KCSAN: data-race in __lru_cache_add / lru_add_drain_all write to 0xffff88812c1299e0 of 1 bytes by task 13044 on cpu 1: pagevec_add include/linux/pagevec.h:81 [inline] __lru_cache_add+0xbf/0x1d0 mm/swap.c:410 lru_cache_add mm/swap.c:447 [inline] lru_cache_add_active_or_unevictable+0xb6/0x1f0 mm/swap.c:477 wp_page_copy+0x820/0x1040 mm/memory.c:2464 do_wp_page+0x192/0xeb0 mm/memory.c:2724 handle_pte_fault mm/memory.c:3961 [inline] __handle_mm_fault+0x1d16/0x2e00 mm/memory.c:4075 handle_mm_fault+0x21b/0x530 mm/memory.c:4112 do_user_addr_fault arch/x86/mm/fault.c:1441 [inline] __do_page_fault+0x456/0x8d0 arch/x86/mm/fault.c:1506 do_page_fault+0x38/0x194 arch/x86/mm/fault.c:1530 page_fault+0x34/0x40 arch/x86/entry/entry_64.S:1203 read to 0xffff88812c1299e0 of 1 bytes by task 13008 on cpu 0: lru_add_drain_all+0x17e/0x3d0 mm/swap.c:746 invalidate_bdev+0x6e/0x90 fs/block_dev.c:97 __loop_clr_fd+0x250/0x740 drivers/block/loop.c:1140 loop_clr_fd drivers/block/loop.c:1237 [inline] lo_ioctl+0x24c/0xc80 drivers/block/loop.c:1606 __blkdev_driver_ioctl block/ioctl.c:277 [inline] blkdev_ioctl+0xbe5/0x1260 block/ioctl.c:582 block_ioctl+0x95/0xc0 fs/block_dev.c:1983 vfs_ioctl fs/ioctl.c:47 [inline] file_ioctl fs/ioctl.c:545 [inline] do_vfs_ioctl+0x84f/0xcf0 fs/ioctl.c:732 ksys_ioctl+0xbd/0xe0 fs/ioctl.c:749 __do_sys_ioctl fs/ioctl.c:756 [inline] __se_sys_ioctl fs/ioctl.c:754 [inline] __x64_sys_ioctl+0x4c/0x60 fs/ioctl.c:754 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 13008 Comm: syz-executor.2 Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================