syzbot

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BUG: KCSAN: data-race in __dentry_kill / dont_mount

read-write to 0xffff88810654cd80 of 4 bytes by task 707 on cpu 0:
 dont_mount+0x2a/0x40 include/linux/dcache.h:381
 vfs_unlink+0x298/0x430 fs/namei.c:4546
 do_unlinkat+0x21b/0x4b0 fs/namei.c:4608
 __do_sys_unlink fs/namei.c:4654 [inline]
 __se_sys_unlink fs/namei.c:4652 [inline]
 __x64_sys_unlink+0x2e/0x40 fs/namei.c:4652
 x64_sys_call+0x2358/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:88
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88810654cd80 of 4 bytes by task 3003 on cpu 1:
 dentry_unlist fs/dcache.c:630 [inline]
 __dentry_kill+0x2af/0x4c0 fs/dcache.c:674
 dput+0x5c/0xd0 fs/dcache.c:902
 handle_mounts fs/namei.c:1640 [inline]
 step_into+0x226/0x860 fs/namei.c:1966
 walk_component+0x178/0x240 fs/namei.c:2134
 lookup_last fs/namei.c:2626 [inline]
 path_lookupat+0x103/0x2a0 fs/namei.c:2650
 filename_lookup+0x14b/0x340 fs/namei.c:2679
 do_readlinkat+0x8b/0x210 fs/stat.c:564
 __do_sys_readlink fs/stat.c:601 [inline]
 __se_sys_readlink fs/stat.c:598 [inline]
 __x64_sys_readlink+0x47/0x60 fs/stat.c:598
 x64_sys_call+0x2a81/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:90
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00300008 -> 0x00000008

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3003 Comm: udevd Not tainted 6.14.0-syzkaller-13423-ga8662bcd2ff1 #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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