KCSAN: data-race in __writeback_single_inode / move_expired

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in __writeback_single_inode / move_expired_inodes (2) ext4				2	1308d	1332d	0/28	auto-closed as invalid on 2021/05/28 07:57

================================================================== BUG: KCSAN: data-race in __writeback_single_inode / move_expired_inodes read-write to 0xffff88810d5f4778 of 8 bytes by task 27961 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 0xffff88810d5f4778 of 8 bytes by task 5352 on cpu 1: __writeback_single_inode+0x45/0x560 fs/fs-writeback.c:1457 writeback_single_inode+0x126/0x580 fs/fs-writeback.c:1570 sync_inode fs/fs-writeback.c:2606 [inline] sync_inode_metadata+0x52/0x70 fs/fs-writeback.c:2626 ext4_fsync_nojournal fs/ext4/fsync.c:92 [inline] ext4_sync_file+0x359/0x6c0 fs/ext4/fsync.c:170 vfs_fsync_range+0x107/0x120 fs/sync.c:200 generic_write_sync include/linux/fs.h:2739 [inline] ext4_buffered_write_iter+0x384/0x3d0 fs/ext4/file.c:278 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:1318 [inline] __se_sys_sendfile64 fs/read_write.c:1304 [inline] __x64_sys_sendfile64+0xf2/0x130 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: 5352 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 ==================================================================