================================================================== BUG: KCSAN: data-race in __mark_inode_dirty / other_inode_match write to 0xffff8880b6d66180 of 8 bytes by task 556 on cpu 0: other_inode_match fs/ext4/inode.c:4884 [inline] other_inode_match+0x13f/0x570 fs/ext4/inode.c:4868 find_inode_nowait+0x12f/0x160 fs/inode.c:1446 ext4_update_other_inodes_time fs/ext4/inode.c:4923 [inline] ext4_do_update_inode fs/ext4/inode.c:5049 [inline] ext4_mark_iloc_dirty+0x12ad/0x1580 fs/ext4/inode.c:5603 ext4_mark_inode_dirty+0xe6/0x420 fs/ext4/inode.c:5796 ext4_dirty_inode+0xad/0xd0 fs/ext4/inode.c:5827 __mark_inode_dirty+0x5b7/0x940 fs/fs-writeback.c:2258 mark_inode_dirty include/linux/fs.h:2189 [inline] generic_write_end+0x24c/0x290 fs/buffer.c:2193 ext4_da_write_end+0x162/0x690 fs/ext4/inode.c:3090 generic_perform_write+0x1d7/0x320 mm/filemap.c:3313 ext4_buffered_write_iter+0x14e/0x280 fs/ext4/file.c:270 ext4_file_write_iter+0xf4/0xd30 fs/ext4/file.c:642 call_write_iter include/linux/fs.h:1907 [inline] new_sync_write+0x303/0x400 fs/read_write.c:484 __vfs_write+0x9e/0xb0 fs/read_write.c:497 vfs_write fs/read_write.c:559 [inline] vfs_write+0x189/0x380 fs/read_write.c:543 ksys_write+0xc5/0x1a0 fs/read_write.c:612 __do_sys_write fs/read_write.c:624 [inline] __se_sys_write fs/read_write.c:621 [inline] __x64_sys_write+0x49/0x60 fs/read_write.c:621 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff8880b6d66180 of 8 bytes by task 9135 on cpu 1: __mark_inode_dirty+0x4c8/0x940 fs/fs-writeback.c:2329 generic_update_time+0x184/0x270 fs/inode.c:1682 update_time+0x7d/0x90 fs/inode.c:1695 touch_atime+0x13f/0x150 fs/inode.c:1766 pick_link fs/namei.c:1624 [inline] step_into+0xab5/0x1090 fs/namei.c:1702 walk_component+0xde/0x390 fs/namei.c:1852 lookup_last fs/namei.c:2295 [inline] path_lookupat.isra.0+0x119/0x350 fs/namei.c:2319 filename_lookup+0x145/0x2c0 fs/namei.c:2352 user_path_at_empty+0x47/0x60 fs/namei.c:2632 user_path_at include/linux/namei.h:59 [inline] ksys_umount+0xee/0xaf0 fs/namespace.c:1683 __do_sys_umount fs/namespace.c:1709 [inline] __se_sys_umount fs/namespace.c:1707 [inline] __x64_sys_umount+0x35/0x50 fs/namespace.c:1707 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 9135 Comm: syz-executor.2 Not tainted 5.7.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================