syzbot

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BUG: KCSAN: data-race in __dentry_kill / d_walk

write to 0xffff888108865900 of 4 bytes by task 20438 on cpu 1:
 d_lru_del fs/dcache.c:437 [inline]
 __dentry_kill+0xa0/0x4b0 fs/dcache.c:598
 dput+0x5c/0xd0 fs/dcache.c:845
 path_put+0x1f/0x40 fs/namei.c:561
 free_fs_struct fs/fs_struct.c:91 [inline]
 exit_fs+0xaf/0xe0 fs/fs_struct.c:108
 do_exit+0x5e6/0x1740 kernel/exit.c:874
 do_group_exit+0x102/0x150 kernel/exit.c:1027
 get_signal+0xf2f/0x1080 kernel/signal.c:2911
 arch_do_signal_or_restart+0x95/0x4b0 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x59/0x130 kernel/entry/common.c:218
 do_syscall_64+0xda/0x1d0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888108865900 of 4 bytes by task 3165 on cpu 0:
 d_walk+0x278/0x4a0 fs/dcache.c:1250
 shrink_dcache_parent+0xce/0x1b0 fs/dcache.c:1498
 vfs_rmdir+0x28d/0x300 fs/namei.c:4210
 do_rmdir+0x194/0x320 fs/namei.c:4265
 __do_sys_unlinkat fs/namei.c:4441 [inline]
 __se_sys_unlinkat fs/namei.c:4435 [inline]
 __x64_sys_unlinkat+0xa4/0xb0 fs/namei.c:4435
 x64_sys_call+0x767/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:264
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00280100 -> 0x00000100

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3165 Comm: syz-fuzzer Tainted: G        W          6.9.0-rc3-syzkaller-00355-g7efd0a74039f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
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