syzbot

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BUG: KCSAN: data-race in pid_revalidate / proc_evict_inode

write to 0xffff8881301833b0 of 8 bytes by task 3134 on cpu 0:
 proc_evict_inode+0x4b/0xe0 fs/proc/inode.c:43
 evict+0x1aa/0x410 fs/inode.c:664
 iput_final fs/inode.c:1747 [inline]
 iput+0x3f9/0x580 fs/inode.c:1773
 dentry_unlink_inode+0x22a/0x240 fs/dcache.c:401
 __dentry_kill+0x28b/0x450 fs/dcache.c:607
 shrink_dentry_list+0x20f/0x380 fs/dcache.c:1201
 prune_dcache_sb+0x72/0xa0 fs/dcache.c:1282
 super_cache_scan+0x24e/0x300 fs/super.c:104
 do_shrink_slab+0x2ad/0x600 mm/vmscan.c:843
 shrink_slab_memcg+0x1c2/0x3e0 mm/vmscan.c:912
 shrink_slab+0x5c/0x1c0 mm/vmscan.c:991
 shrink_node_memcgs+0x277/0x450 mm/vmscan.c:6140
 shrink_node+0x1d7/0x930 mm/vmscan.c:6169
 shrink_zones+0x2c1/0x5d0 mm/vmscan.c:6407
 do_try_to_free_pages+0x195/0x760 mm/vmscan.c:6469
 try_to_free_mem_cgroup_pages+0x1d0/0x420 mm/vmscan.c:6786
 reclaim_high+0xd0/0x120 mm/memcontrol.c:2394
 mem_cgroup_handle_over_high+0x75/0x120 mm/memcontrol.c:2580
 resume_user_mode_work include/linux/resume_user_mode.h:58 [inline]
 exit_to_user_mode_loop+0xa5/0x130 kernel/entry/common.c:171
 exit_to_user_mode_prepare+0x69/0x90 kernel/entry/common.c:203
 irqentry_exit_to_user_mode+0x5/0x10 kernel/entry/common.c:309
 irqentry_exit+0xe/0x40 kernel/entry/common.c:412
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:570

read to 0xffff8881301833b0 of 8 bytes by task 1953 on cpu 1:
 proc_pid fs/proc/internal.h:125 [inline]
 pid_revalidate+0x2c/0xa0 fs/proc/base.c:2018
 d_revalidate fs/namei.c:856 [inline]
 lookup_fast+0x1a3/0x270 fs/namei.c:1634
 walk_component+0x3f/0x230 fs/namei.c:1989
 link_path_walk+0x511/0x8a0 fs/namei.c:2317
 path_openat+0x19d/0x1b60 fs/namei.c:3710
 do_filp_open+0x105/0x220 fs/namei.c:3741
 do_sys_openat2+0xb5/0x2a0 fs/open.c:1310
 do_sys_open fs/open.c:1326 [inline]
 __do_sys_openat fs/open.c:1342 [inline]
 __se_sys_openat fs/open.c:1337 [inline]
 __x64_sys_openat+0xef/0x110 fs/open.c:1337
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0xffff88812c8bd800 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 1953 Comm: syz-executor.3 Not tainted 6.2.0-rc2-syzkaller-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
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