KCSAN: data-race in ext4_write_end / mpage_submit

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in ext4_write_end / mpage_submit_page (2) ext4				5	1432d	1574d	0/26	closed as invalid on 2020/06/18 14:24
upstream	KCSAN: data-race in ext4_write_end / mpage_submit_page (3) ext4				1	1401d	1401d	0/26	auto-closed as invalid on 2020/07/28 15:53

================================================================== BUG: KCSAN: data-race in ext4_write_end / mpage_submit_page read to 0xffff8880b59f8628 of 8 bytes by task 8145 on cpu 1: mpage_submit_page+0x81/0x170 fs/ext4/inode.c:2216 mpage_map_and_submit_buffers+0x331/0x520 fs/ext4/inode.c:2422 mpage_map_and_submit_extent fs/ext4/inode.c:2556 [inline] ext4_writepages+0x1458/0x2300 fs/ext4/inode.c:2869 do_writepages+0x6b/0x170 mm/page-writeback.c:2344 __writeback_single_inode+0xaf/0x8e0 fs/fs-writeback.c:1449 writeback_sb_inodes+0x4ba/0xa50 fs/fs-writeback.c:1713 wb_writeback+0x1f9/0x6a0 fs/fs-writeback.c:1889 wb_do_writeback fs/fs-writeback.c:2034 [inline] wb_workfn+0x22e/0x970 fs/fs-writeback.c:2075 process_one_work+0x3d4/0x890 kernel/workqueue.c:2269 worker_thread+0xa0/0x800 kernel/workqueue.c:2415 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352 write to 0xffff8880b59f8628 of 8 bytes by task 26545 on cpu 0: i_size_write include/linux/fs.h:888 [inline] ext4_update_inode_size fs/ext4/ext4.h:2979 [inline] ext4_write_end+0x5ae/0x760 fs/ext4/inode.c:1435 ext4_da_write_end+0x2e4/0x620 fs/ext4/inode.c:3158 generic_perform_write+0x1d3/0x320 mm/filemap.c:3316 __generic_file_write_iter+0x251/0x380 mm/filemap.c:3434 ext4_file_write_iter+0x1bd/0xa00 fs/ext4/file.c:268 call_write_iter include/linux/fs.h:1895 [inline] new_sync_write+0x388/0x4a0 fs/read_write.c:483 __vfs_write+0xb1/0xc0 fs/read_write.c:496 vfs_write fs/read_write.c:558 [inline] vfs_write+0x18a/0x390 fs/read_write.c:542 ksys_write+0xd5/0x1b0 fs/read_write.c:611 __do_sys_write fs/read_write.c:623 [inline] __se_sys_write fs/read_write.c:620 [inline] __x64_sys_write+0x4c/0x60 fs/read_write.c:620 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 26545 Comm: syz-executor.4 Not tainted 5.4.0-rc6+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================