syzbot

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BUG: KCSAN: data-race in dentry_lru_isolate / step_into

write to 0xffff88810b322600 of 4 bytes by task 3144 on cpu 1:
 d_lru_shrink_move fs/dcache.c:480 [inline]
 dentry_lru_isolate+0x143/0x210 fs/dcache.c:1257
 __list_lru_walk_one+0x180/0x3b0 mm/list_lru.c:231
 list_lru_walk_one+0x80/0xa0 mm/list_lru.c:276
 list_lru_shrink_walk include/linux/list_lru.h:194 [inline]
 prune_dcache_sb+0x76/0xb0 fs/dcache.c:1280
 super_cache_scan+0x26c/0x310 fs/super.c:104
 do_shrink_slab+0x2a0/0x640 mm/vmscan.c:847
 shrink_slab_memcg mm/vmscan.c:916 [inline]
 shrink_slab+0x2bc/0x520 mm/vmscan.c:995
 shrink_node_memcgs mm/vmscan.c:6147 [inline]
 shrink_node+0xaf5/0x14f0 mm/vmscan.c:6176
 shrink_zones mm/vmscan.c:6414 [inline]
 do_try_to_free_pages+0x40d/0xc80 mm/vmscan.c:6476
 try_to_free_mem_cgroup_pages+0x1e2/0x480 mm/vmscan.c:6791
 reclaim_high+0xca/0x110 mm/memcontrol.c:2393
 mem_cgroup_handle_over_high+0x8c/0x1a0 mm/memcontrol.c:2578
 resume_user_mode_work include/linux/resume_user_mode.h:58 [inline]
 exit_to_user_mode_loop+0x99/0xe0 kernel/entry/common.c:171
 exit_to_user_mode_prepare+0x6a/0xa0 kernel/entry/common.c:203
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x26/0x140 kernel/entry/common.c:296
 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff88810b322600 of 4 bytes by task 20971 on cpu 0:
 __d_entry_type include/linux/dcache.h:385 [inline]
 d_is_symlink include/linux/dcache.h:415 [inline]
 step_into+0x12f/0x800 fs/namei.c:1836
 walk_component+0x164/0x230 fs/namei.c:1999
 lookup_last fs/namei.c:2450 [inline]
 path_lookupat+0x10a/0x2a0 fs/namei.c:2474
 filename_lookup+0x126/0x300 fs/namei.c:2503
 user_path_at_empty+0x42/0x110 fs/namei.c:2876
 user_path_at include/linux/namei.h:57 [inline]
 __do_sys_chdir fs/open.c:514 [inline]
 __se_sys_chdir+0x4f/0x140 fs/open.c:508
 __x64_sys_chdir+0x1f/0x30 fs/open.c:508
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00280000 -> 0x00008000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 20971 Comm: syz-executor.3 Not tainted 6.2.0-rc8-syzkaller-00151-g925cf0457d7e-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023
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