loop3: detected capacity change from 0 to 32760 FAT-fs (loop3): bogus sectors per cluster 7 FAT-fs (loop3): Can't find a valid FAT filesystem ================================================================== BUG: KCSAN: data-race in lru_add_drain_all / lru_cache_add_inactive_or_unevictable write to 0xffff888237d264a8 of 1 bytes by task 25274 on cpu 1: pagevec_add include/linux/pagevec.h:74 [inline] lru_cache_add mm/swap.c:461 [inline] lru_cache_add_inactive_or_unevictable+0xa9/0x250 mm/swap.c:493 wp_page_copy+0x7f8/0x10c0 mm/memory.c:2953 do_wp_page+0x5a8/0xba0 include/linux/spinlock_api_smp.h:152 handle_pte_fault mm/memory.c:4385 [inline] __handle_mm_fault mm/memory.c:4502 [inline] handle_mm_fault+0xb31/0x1a70 mm/memory.c:4600 do_user_addr_fault+0x60c/0xc00 arch/x86/mm/fault.c:1390 handle_page_fault arch/x86/mm/fault.c:1475 [inline] exc_page_fault+0x94/0x230 arch/x86/mm/fault.c:1531 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:577 read to 0xffff888237d264a8 of 1 bytes by task 25257 on cpu 0: pagevec_count include/linux/pagevec.h:61 [inline] lru_add_drain_all+0x108/0x3b0 mm/swap.c:813 invalidate_bdev+0x50/0x70 fs/block_dev.c:96 __loop_clr_fd+0x2e2/0x650 drivers/block/loop.c:1241 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:585 block_ioctl+0x6d/0x80 fs/block_dev.c:1664 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:1069 [inline] __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:1055 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:1055 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 25257 Comm: syz-executor.3 Not tainted 5.12.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================