FAT-fs (loop3): bogus number of directory entries (541) FAT-fs (loop3): Can't find a valid FAT filesystem ================================================================== BUG: KCSAN: data-race in __lru_cache_add / lru_add_drain_all write to 0xffff88812c029b60 of 1 bytes by task 20935 on cpu 0: pagevec_add include/linux/pagevec.h:81 [inline] __lru_cache_add+0xb8/0x1c0 mm/swap.c:410 lru_cache_add_anon+0x98/0x120 mm/swap.c:423 shmem_getpage_gfp+0x4d4/0x14c0 mm/shmem.c:1885 shmem_fault+0x117/0x480 mm/shmem.c:2067 __do_fault+0xa8/0x1e0 mm/memory.c:3276 do_read_fault mm/memory.c:3673 [inline] do_fault mm/memory.c:3802 [inline] handle_pte_fault mm/memory.c:4033 [inline] __handle_mm_fault+0x2611/0x2cf0 mm/memory.c:4163 handle_mm_fault+0x21c/0x540 mm/memory.c:4200 faultin_page mm/gup.c:659 [inline] __get_user_pages+0x485/0x1140 mm/gup.c:870 populate_vma_page_range+0xdc/0x100 mm/gup.c:1181 __mm_populate+0x168/0x2b0 mm/gup.c:1229 mm_populate include/linux/mm.h:2343 [inline] vm_mmap_pgoff+0x185/0x190 mm/util.c:511 ksys_mmap_pgoff+0x96/0x420 mm/mmap.c:1597 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88812c029b60 of 1 bytes by task 20929 on cpu 1: lru_add_drain_all+0x169/0x3a0 mm/swap.c:746 invalidate_bdev+0x65/0x90 fs/block_dev.c:97 __loop_clr_fd+0x24e/0x710 drivers/block/loop.c:1140 loop_clr_fd drivers/block/loop.c:1237 [inline] lo_ioctl+0x24a/0xc80 drivers/block/loop.c:1606 __blkdev_driver_ioctl block/ioctl.c:321 [inline] blkdev_ioctl+0x1a1/0x420 block/ioctl.c:717 block_ioctl+0x91/0xb0 fs/block_dev.c:1983 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x101/0x150 fs/ioctl.c:763 __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl fs/ioctl.c:770 [inline] __x64_sys_ioctl+0x47/0x60 fs/ioctl.c:770 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 20929 Comm: syz-executor.3 Not tainted 5.6.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================