syzbot

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BUG: KCSAN: data-race in dentry_unlink_inode / step_into_slowpath

write to 0xffff88811b23cab0 of 8 bytes by task 2164 on cpu 0:
 __d_clear_type_and_inode fs/dcache.c:420 [inline]
 dentry_unlink_inode+0x6a/0x290 fs/dcache.c:457
 d_delete+0xc8/0xe0 fs/dcache.c:2597
 d_delete_notify+0x32/0x100 include/linux/fsnotify.h:375
 vfs_unlink+0x289/0x490 fs/namei.c:5523
 filename_unlinkat+0x1e2/0x410 fs/namei.c:5578
 __do_sys_unlink fs/namei.c:5613 [inline]
 __se_sys_unlink+0x2b/0xe0 fs/namei.c:5610
 __x64_sys_unlink+0x1f/0x30 fs/namei.c:5610
 x64_sys_call+0x2eb6/0x3020 arch/x86/include/generated/asm/syscalls_64.h:88
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88811b23cab0 of 8 bytes by task 2981 on cpu 1:
 step_into_slowpath+0x12c/0x4c0 fs/namei.c:2103
 step_into fs/namei.c:2148 [inline]
 walk_component fs/namei.c:2284 [inline]
 lookup_last fs/namei.c:2785 [inline]
 path_lookupat+0x330/0x500 fs/namei.c:2809
 filename_lookup+0x190/0x390 fs/namei.c:2838
 do_readlinkat+0x74/0x2f0 fs/stat.c:571
 __do_sys_readlink fs/stat.c:605 [inline]
 __se_sys_readlink fs/stat.c:602 [inline]
 __x64_sys_readlink+0x47/0x60 fs/stat.c:602
 x64_sys_call+0x2b51/0x3020 arch/x86/include/generated/asm/syscalls_64.h:90
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0xffff8881a3a07638 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 2981 Comm: udevd Tainted: G        W           syzkaller #0 PREEMPT(lazy) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
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