KCSAN: data-race in __ext4_update_other_inode_time / writeback_sb

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in __ext4_update_other_inode_time / writeback_sb_inodes (3) ext4				1	1046d	1046d	0/26	auto-closed as invalid on 2021/07/09 20:34
upstream	KCSAN: data-race in __ext4_update_other_inode_time / writeback_sb_inodes (2) ext4				1	1172d	1172d	0/26	auto-closed as invalid on 2021/03/05 19:46

================================================================== BUG: KCSAN: data-race in __ext4_update_other_inode_time / writeback_sb_inodes write to 0xffff888060375280 of 8 bytes by task 1312 on cpu 1: writeback_sb_inodes+0x3a7/0xe40 fs/fs-writeback.c:1705 wb_writeback+0x2b8/0x730 fs/fs-writeback.c:1892 wb_do_writeback+0x108/0x610 fs/fs-writeback.c:2037 wb_workfn+0xc8/0x460 fs/fs-writeback.c:2078 process_one_work+0x3e1/0x9a0 kernel/workqueue.c:2269 worker_thread+0x665/0xbe0 kernel/workqueue.c:2415 kthread+0x20d/0x230 kernel/kthread.c:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 read to 0xffff888060375280 of 8 bytes by task 27079 on cpu 0: __ext4_update_other_inode_time+0x45/0x570 fs/ext4/inode.c:4893 ext4_update_other_inodes_time fs/ext4/inode.c:4940 [inline] ext4_do_update_inode fs/ext4/inode.c:5068 [inline] ext4_mark_iloc_dirty+0x1296/0x1660 fs/ext4/inode.c:5624 __ext4_mark_inode_dirty+0x448/0x630 fs/ext4/inode.c:5818 __ext4_ext_dirty fs/ext4/extents.c:169 [inline] ext4_convert_unwritten_extents_endio fs/ext4/extents.c:3729 [inline] ext4_ext_handle_unwritten_extents+0x6e1/0xaa0 fs/ext4/extents.c:3854 ext4_ext_map_blocks+0x758/0x20c0 fs/ext4/extents.c:4124 ext4_map_blocks+0x6d3/0xf60 fs/ext4/inode.c:626 ext4_convert_unwritten_extents+0x16a/0x2d0 fs/ext4/extents.c:4755 ext4_convert_unwritten_io_end_vec+0xa4/0x130 fs/ext4/extents.c:4794 ext4_end_io_end fs/ext4/page-io.c:187 [inline] ext4_do_flush_completed_IO fs/ext4/page-io.c:260 [inline] ext4_end_io_rsv_work+0x198/0x360 fs/ext4/page-io.c:274 process_one_work+0x3e1/0x9a0 kernel/workqueue.c:2269 worker_thread+0x665/0xbe0 kernel/workqueue.c:2415 kthread+0x20d/0x230 kernel/kthread.c:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 27079 Comm: kworker/u4:6 Not tainted 5.8.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: ext4-rsv-conversion ext4_end_io_rsv_work ==================================================================