================================================================== BUG: KCSAN: data-race in lru_add_drain_all / lru_cache_add write to 0xffff888237d26468 of 1 bytes by task 25559 on cpu 1: pagevec_add include/linux/pagevec.h:74 [inline] lru_cache_add+0x74/0x130 mm/swap.c:461 shmem_getpage_gfp+0xcf8/0x1410 mm/shmem.c:1934 shmem_getpage mm/shmem.c:155 [inline] shmem_file_read_iter+0x1a2/0x5c0 mm/shmem.c:2607 call_read_iter include/linux/fs.h:1971 [inline] do_iter_readv_writev+0x2e8/0x360 fs/read_write.c:738 do_iter_read+0x109/0x4b0 fs/read_write.c:801 vfs_iter_read+0x4c/0x70 fs/read_write.c:843 lo_read_simple drivers/block/loop.c:360 [inline] do_req_filebacked drivers/block/loop.c:636 [inline] loop_handle_cmd drivers/block/loop.c:2045 [inline] loop_queue_work+0xdfb/0x1330 drivers/block/loop.c:2063 kthread_worker_fn+0x280/0x4d0 kernel/kthread.c:735 loop_kthread_worker_fn+0x3e/0x50 drivers/block/loop.c:932 kthread+0x1d0/0x1f0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 read to 0xffff888237d26468 of 1 bytes by task 1773 on cpu 0: 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 ext4_put_super+0x5d0/0x8e0 fs/ext4/super.c:1229 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 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 1773 Comm: syz-executor.4 Not tainted 5.12.0-rc8-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================