================================================================== BUG: KCSAN: data-race in __mark_inode_dirty / move_expired_inodes read-write to 0xffff88811db1e358 of 8 bytes by task 8 on cpu 0: move_expired_inodes+0x1bf/0x490 fs/fs-writeback.c:1257 queue_io+0xe1/0x2b0 fs/fs-writeback.c:1304 wb_writeback+0x255/0x660 fs/fs-writeback.c:1892 wb_do_writeback+0x101/0x5d0 fs/fs-writeback.c:2039 wb_workfn+0xb8/0x410 fs/fs-writeback.c:2080 process_one_work+0x3e1/0x950 kernel/workqueue.c:2272 worker_thread+0x635/0xb90 kernel/workqueue.c:2418 kthread+0x1fd/0x220 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 read to 0xffff88811db1e358 of 8 bytes by task 4266 on cpu 1: __mark_inode_dirty+0xb7/0x740 fs/fs-writeback.c:2274 generic_update_time fs/inode.c:1764 [inline] update_time fs/inode.c:1777 [inline] file_update_time+0x3b0/0x3f0 fs/inode.c:1992 file_modified+0x62/0x80 fs/inode.c:2015 ext4_write_checks fs/ext4/file.c:248 [inline] ext4_buffered_write_iter+0x1f9/0x3d0 fs/ext4/file.c:265 ext4_file_write_iter+0x45e/0x1090 fs/ext4/file.c:503 call_write_iter include/linux/fs.h:1903 [inline] do_iter_readv_writev+0x2cb/0x360 fs/read_write.c:740 do_iter_write+0x112/0x4b0 fs/read_write.c:866 vfs_iter_write+0x4c/0x70 fs/read_write.c:907 iter_file_splice_write+0x42a/0x780 fs/splice.c:686 do_splice_from fs/splice.c:764 [inline] direct_splice_actor+0x80/0xa0 fs/splice.c:933 splice_direct_to_actor+0x345/0x650 fs/splice.c:888 do_splice_direct+0xf5/0x170 fs/splice.c:976 do_sendfile+0x5db/0xca0 fs/read_write.c:1257 __do_sys_sendfile64 fs/read_write.c:1312 [inline] __se_sys_sendfile64 fs/read_write.c:1304 [inline] __x64_sys_sendfile64+0xa9/0x130 fs/read_write.c:1304 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: 1 PID: 4266 Comm: syz-executor.0 Not tainted 5.10.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================