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BUG: KCSAN: data-race in __fsnotify_parent / d_make_discardable

write to 0xffff88811ad726c0 of 4 bytes by task 5266 on cpu 1:
 d_make_discardable+0x4f/0x90 fs/dcache.c:1050
 simple_unlink+0x68/0x80 fs/libfs.c:808
 shmem_unlink+0x12d/0x140 mm/shmem.c:3917
 shmem_rename2+0x185/0x310 mm/shmem.c:3998
 vfs_rename+0x963/0xac0 fs/namei.c:6070
 filename_renameat2+0x3a4/0x6a0 fs/namei.c:6188
 __do_sys_rename fs/namei.c:6232 [inline]
 __se_sys_rename+0x4a/0x1c0 fs/namei.c:6228
 __x64_sys_rename+0x31/0x40 fs/namei.c:6228
 x64_sys_call+0x2b3/0x3020 arch/x86/include/generated/asm/syscalls_64.h:83
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88811ad726c0 of 4 bytes by task 7603 on cpu 0:
 __fsnotify_parent+0xbc/0x3a0 fs/notify/fsnotify.c:192
 fsnotify_parent include/linux/fsnotify.h:96 [inline]
 fsnotify_path include/linux/fsnotify.h:113 [inline]
 fsnotify_file include/linux/fsnotify.h:127 [inline]
 fsnotify_open include/linux/fsnotify.h:450 [inline]
 vfs_open+0x19c/0x1e0 fs/open.c:1059
 do_open fs/namei.c:4700 [inline]
 path_openat+0x1b39/0x2000 fs/namei.c:4859
 do_file_open+0x16c/0x290 fs/namei.c:4888
 do_sys_openat2+0xa0/0x130 fs/open.c:1368
 do_sys_open fs/open.c:1374 [inline]
 __do_sys_openat fs/open.c:1390 [inline]
 __se_sys_openat fs/open.c:1385 [inline]
 __x64_sys_openat+0xf2/0x120 fs/open.c:1385
 x64_sys_call+0x1e39/0x3020 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x08200080 -> 0x00200180

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 7603 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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