NILFS (loop2): broken superblock, retrying with spare superblock (blocksize = 2048) NILFS (loop2): mounting unchecked fs NILFS (loop2): recovery complete ================================================================== BUG: KCSAN: data-race in nilfs_attach_log_writer / nilfs_segctor_thread write to 0xffff8880259189e8 of 8 bytes by task 17367 on cpu 1: nilfs_segctor_thread+0x7a/0x700 fs/nilfs2/segment.c:2541 kthread+0x1fd/0x220 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 read to 0xffff8880259189e8 of 8 bytes by task 17358 on cpu 0: nilfs_segctor_start_thread fs/nilfs2/segment.c:2623 [inline] nilfs_attach_log_writer+0x4b3/0x560 fs/nilfs2/segment.c:2785 nilfs_fill_super fs/nilfs2/super.c:1072 [inline] nilfs_mount+0x90b/0xac0 fs/nilfs2/super.c:1316 legacy_get_tree+0x70/0xc0 fs/fs_context.c:592 vfs_get_tree+0x4a/0x190 fs/super.c:1496 do_new_mount fs/namespace.c:2878 [inline] path_mount+0x119d/0x1c10 fs/namespace.c:3208 do_mount fs/namespace.c:3221 [inline] __do_sys_mount fs/namespace.c:3429 [inline] __se_sys_mount+0x23d/0x2e0 fs/namespace.c:3406 __x64_sys_mount+0x63/0x70 fs/namespace.c:3406 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 17358 Comm: syz-executor.2 Not tainted 5.10.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================