================================================================== BUG: KCSAN: data-race in copy_page_to_iter / fat_set_state write to 0xffff88812ca05025 of 1 bytes by task 1765 on cpu 0: fat_set_state+0x16c/0x1d0 fs/fat/inode.c:704 fat_put_super+0x2a/0x80 fs/fat/inode.c:734 generic_shutdown_super+0xd5/0x220 fs/super.c:464 kill_block_super+0x4a/0x90 fs/super.c:1394 deactivate_locked_super+0x65/0xd0 fs/super.c:335 deactivate_super+0x85/0x90 fs/super.c:366 cleanup_mnt+0x277/0x2e0 fs/namespace.c:1136 __cleanup_mnt+0x15/0x20 fs/namespace.c:1143 task_work_run+0xae/0x130 kernel/task_work.c:140 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x151/0x170 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:301 do_syscall_64+0x40/0x50 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff88812ca05000 of 1377 bytes by task 18853 on cpu 1: instrument_copy_to_user include/linux/instrumented.h:119 [inline] copyout lib/iov_iter.c:145 [inline] copy_page_to_iter_iovec lib/iov_iter.c:217 [inline] copy_page_to_iter+0x31b/0x860 lib/iov_iter.c:912 filemap_read+0xee6/0x1210 mm/filemap.c:2519 generic_file_read_iter+0x84/0x3e0 mm/filemap.c:2615 blkdev_read_iter+0xb3/0xc0 fs/block_dev.c:1727 call_read_iter include/linux/fs.h:1971 [inline] new_sync_read fs/read_write.c:415 [inline] vfs_read+0x565/0x5d0 fs/read_write.c:496 ksys_read+0xce/0x180 fs/read_write.c:634 __do_sys_read fs/read_write.c:644 [inline] __se_sys_read fs/read_write.c:642 [inline] __x64_sys_read+0x3e/0x50 fs/read_write.c:642 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 18853 Comm: systemd-udevd Not tainted 5.12.0-rc8-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================