F2FS-fs (loop4): Can't find valid F2FS filesystem in 1th superblock F2FS-fs (loop4): Magic Mismatch, valid(0xf2f52010) - read(0x0) F2FS-fs (loop4): Can't find valid F2FS filesystem in 2th superblock ================================================================== BUG: KCSAN: data-race in __pagevec_lru_add / lru_add_drain_all write to 0xffff88813bc27550 of 1 bytes by task 27508 on cpu 0: pagevec_reinit include/linux/pagevec.h:56 [inline] __pagevec_lru_add+0x24b/0x280 mm/swap.c:1017 lru_add_drain_cpu+0x6a/0x260 mm/swap.c:606 lru_add_drain+0x30/0x70 mm/swap.c:710 exit_mmap+0x199/0x400 mm/mmap.c:3213 __mmput+0xa2/0x220 kernel/fork.c:1090 mmput+0x3d/0x50 kernel/fork.c:1111 exit_mm+0x344/0x430 kernel/exit.c:501 do_exit+0x3fc/0x15e0 kernel/exit.c:812 do_group_exit+0xa4/0x180 kernel/exit.c:922 __do_sys_exit_group+0xb/0x10 kernel/exit.c:933 __se_sys_exit_group+0x5/0x10 kernel/exit.c:931 __x64_sys_exit_group+0x16/0x20 kernel/exit.c:931 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff88813bc27550 of 1 bytes by task 27505 on cpu 1: pagevec_count include/linux/pagevec.h:61 [inline] lru_add_drain_all+0x108/0x3c0 mm/swap.c:813 invalidate_bdev+0x50/0x70 fs/block_dev.c:96 __loop_clr_fd+0x2c5/0x630 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:583 block_ioctl+0x6d/0x80 fs/block_dev.c:1667 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+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 27505 Comm: syz-executor.4 Tainted: G W 5.12.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================