KCSAN: data-race in dentry_lru_isolate / iterate

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in dentry_lru_isolate / iterate_dir fs				1	1295d	1295d	0/26	auto-closed as invalid on 2020/11/11 19:55

================================================================== BUG: KCSAN: data-race in dentry_lru_isolate / iterate_dir write to 0xffff8880112fca80 of 4 bytes by task 2121 on cpu 0: d_lru_isolate fs/dcache.c:442 [inline] dentry_lru_isolate+0x9f/0x200 fs/dcache.c:1199 __list_lru_walk_one+0xfb/0x320 mm/list_lru.c:222 list_lru_walk_one+0x75/0x90 mm/list_lru.c:266 list_lru_shrink_walk include/linux/list_lru.h:195 [inline] prune_dcache_sb+0x67/0xa0 fs/dcache.c:1253 super_cache_scan+0x23e/0x2e0 fs/super.c:105 do_shrink_slab+0x28b/0x550 mm/vmscan.c:512 shrink_slab+0xea/0x1c0 mm/vmscan.c:673 shrink_node_memcgs+0x28a/0x420 mm/vmscan.c:2655 shrink_node+0x9fa/0x1220 mm/vmscan.c:2770 kswapd_shrink_node mm/vmscan.c:3513 [inline] balance_pgdat+0x6a5/0xc50 mm/vmscan.c:3671 kswapd+0x1f3/0x340 mm/vmscan.c:3928 kthread+0x20b/0x230 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 read to 0xffff8880112fca80 of 4 bytes by task 4832 on cpu 1: fsnotify_parent include/linux/fsnotify.h:60 [inline] fsnotify_file include/linux/fsnotify.h:90 [inline] fsnotify_access include/linux/fsnotify.h:247 [inline] iterate_dir+0x24f/0x370 fs/readdir.c:69 __do_sys_getdents fs/readdir.c:283 [inline] __se_sys_getdents+0x7f/0x190 fs/readdir.c:268 __x64_sys_getdents+0x3f/0x50 fs/readdir.c:268 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 4832 Comm: systemd-udevd Tainted: G W 5.12.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================