syzbot

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BUG: KCSAN: data-race in path_openat / shrink_dentry_list

read-write to 0xffff88811b029180 of 4 bytes by task 2679 on cpu 0:
 d_shrink_del fs/dcache.c:516 [inline]
 shrink_dentry_list+0x22d/0x3c0 fs/dcache.c:1156
 prune_dcache_sb+0x80/0xb0 fs/dcache.c:1246
 super_cache_scan+0x2a3/0x360 fs/super.c:222
 do_shrink_slab+0x2ec/0x680 mm/shrinker.c:437
 shrink_slab_memcg mm/shrinker.c:550 [inline]
 shrink_slab+0x4f5/0x840 mm/shrinker.c:628
 shrink_node_memcgs mm/vmscan.c:6022 [inline]
 shrink_node+0x6a9/0x2010 mm/vmscan.c:6061
 shrink_zones mm/vmscan.c:6300 [inline]
 do_try_to_free_pages+0x3f6/0xcd0 mm/vmscan.c:6362
 try_to_free_mem_cgroup_pages+0x1ab/0x410 mm/vmscan.c:6690
 try_charge_memcg+0x383/0xa10 mm/memcontrol.c:2388
 obj_cgroup_charge_pages+0xa6/0x150 mm/memcontrol.c:2823
 __memcg_kmem_charge_page+0x9f/0x170 mm/memcontrol.c:2867
 __alloc_frozen_pages_noprof+0x18f/0x360 mm/page_alloc.c:5227
 alloc_pages_mpol+0xb3/0x260 mm/mempolicy.c:2486
 alloc_frozen_pages_noprof mm/mempolicy.c:2557 [inline]
 alloc_pages_noprof+0x90/0x130 mm/mempolicy.c:2577
 vm_area_alloc_pages mm/vmalloc.c:3718 [inline]
 __vmalloc_area_node mm/vmalloc.c:3863 [inline]
 __vmalloc_node_range_noprof+0xa7b/0x1310 mm/vmalloc.c:4051
 __bpf_map_area_alloc kernel/bpf/syscall.c:401 [inline]
 bpf_map_area_alloc+0xfa/0x150 kernel/bpf/syscall.c:408
 array_map_alloc+0x1d3/0x3c0 kernel/bpf/arraymap.c:142
 array_of_map_alloc+0x3b/0x80 kernel/bpf/arraymap.c:1365
 map_create+0x862/0xda0 kernel/bpf/syscall.c:1514
 __sys_bpf+0x54e/0x7c0 kernel/bpf/syscall.c:6146
 __do_sys_bpf kernel/bpf/syscall.c:6274 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6272 [inline]
 __x64_sys_bpf+0x41/0x50 kernel/bpf/syscall.c:6272
 x64_sys_call+0x28e1/0x3000 arch/x86/include/generated/asm/syscalls_64.h:322
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xca/0x2b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88811b029180 of 4 bytes by task 1956 on cpu 1:
 __d_entry_type include/linux/dcache.h:416 [inline]
 d_is_reg include/linux/dcache.h:451 [inline]
 do_open fs/namei.c:4629 [inline]
 path_openat+0x1cbe/0x23b0 fs/namei.c:4796
 do_filp_open+0x109/0x230 fs/namei.c:4823
 do_sys_openat2+0xa6/0x150 fs/open.c:1430
 do_sys_open fs/open.c:1436 [inline]
 __do_sys_openat fs/open.c:1452 [inline]
 __se_sys_openat fs/open.c:1447 [inline]
 __x64_sys_openat+0xf2/0x120 fs/open.c:1447
 x64_sys_call+0x2b07/0x3000 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xca/0x2b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00240404 -> 0x00200004

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 1956 Comm: syz-executor Tainted: G        W           syzkaller #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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