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BUG: KCSAN: data-race in __fsnotify_parent / d_make_discardable

write to 0xffff8881110ee480 of 4 bytes by task 3281 on cpu 0:
 d_make_discardable+0x4f/0x90 fs/dcache.c:1050
 simple_unlink+0x68/0x80 fs/libfs.c:808
 shmem_unlink+0x12d/0x140 mm/shmem.c:3932
 shmem_rename2+0x185/0x310 mm/shmem.c:4013
 vfs_rename+0x963/0xac0 fs/namei.c:6208
 filename_renameat2+0x3a4/0x6a0 fs/namei.c:6326
 __do_sys_rename fs/namei.c:6370 [inline]
 __se_sys_rename+0x4a/0x1c0 fs/namei.c:6366
 __x64_sys_rename+0x31/0x40 fs/namei.c:6366
 x64_sys_call+0x20fe/0x2550 arch/x86/include/generated/asm/syscalls_64.h:83
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff8881110ee480 of 4 bytes by task 3755 on cpu 1:
 __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_access include/linux/fsnotify.h:429 [inline]
 vfs_read+0x470/0x7c0 fs/read_write.c:578
 ksys_read+0xdc/0x1a0 fs/read_write.c:716
 __do_sys_read fs/read_write.c:725 [inline]
 __se_sys_read fs/read_write.c:723 [inline]
 __x64_sys_read+0x40/0x50 fs/read_write.c:723
 x64_sys_call+0x2135/0x2550 arch/x86/include/generated/asm/syscalls_64.h:1
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x08200080 -> 0x00200180

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3755 Comm: udevd Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
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