================================================================== BUG: KCSAN: data-race in __ext4_unlink / __ext4_update_other_inode_time write to 0xffff888042129c80 of 8 bytes by task 19164 on cpu 1: __ext4_unlink+0x5ed/0x7d0 fs/ext4/namei.c:3256 ext4_unlink+0xc8/0x2a0 fs/ext4/namei.c:3285 vfs_unlink+0x232/0x3b0 fs/namei.c:3832 do_unlinkat+0x28a/0x4d0 fs/namei.c:3896 __do_sys_unlink fs/namei.c:3942 [inline] __se_sys_unlink fs/namei.c:3940 [inline] __x64_sys_unlink+0x2c/0x30 fs/namei.c:3940 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff888042129c80 of 8 bytes by task 23848 on cpu 0: ext4_encode_extra_time fs/ext4/ext4.h:881 [inline] __ext4_update_other_inode_time+0x14f/0x550 fs/ext4/inode.c:4967 ext4_update_other_inodes_time fs/ext4/inode.c:4999 [inline] ext4_do_update_inode fs/ext4/inode.c:5128 [inline] ext4_mark_iloc_dirty+0x1286/0x1650 fs/ext4/inode.c:5709 __ext4_mark_inode_dirty+0x450/0x610 fs/ext4/inode.c:5903 add_dirent_to_buf+0x465/0x5e0 fs/ext4/namei.c:2040 ext4_add_entry+0x665/0x2180 fs/ext4/namei.c:2252 ext4_add_nondir+0x50/0x190 fs/ext4/namei.c:2586 ext4_symlink+0x532/0x770 fs/ext4/namei.c:3415 vfs_symlink+0x216/0x2d0 fs/namei.c:3959 do_symlinkat+0xee/0x280 fs/namei.c:3986 __do_sys_symlink fs/namei.c:4005 [inline] __se_sys_symlink fs/namei.c:4003 [inline] __x64_sys_symlink+0x32/0x40 fs/namei.c:4003 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: 0 PID: 23848 Comm: syz-executor.3 Not tainted 5.9.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================