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BUG: KCSAN: data-race in d_make_discardable / dentry_kill

write to 0xffff888119d95840 of 4 bytes by task 12054 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:6074
 filename_renameat2+0x3a4/0x6a0 fs/namei.c:6192
 __do_sys_rename fs/namei.c:6236 [inline]
 __se_sys_rename+0x4a/0x1c0 fs/namei.c:6232
 __x64_sys_rename+0x31/0x40 fs/namei.c:6232
 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 0xffff888119d95840 of 4 bytes by task 13074 on cpu 0:
 dentry_unlist fs/dcache.c:694 [inline]
 dentry_kill+0x2d3/0x500 fs/dcache.c:840
 finish_dput+0x16/0x1d0 fs/dcache.c:1001
 dput+0x48/0x50 fs/dcache.c:1042
 end_renaming fs/namei.c:4122 [inline]
 filename_renameat2+0x478/0x6a0 fs/namei.c:6194
 __do_sys_rename fs/namei.c:6236 [inline]
 __se_sys_rename+0x4a/0x1c0 fs/namei.c:6232
 __x64_sys_rename+0x31/0x40 fs/namei.c:6232
 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

value changed: 0x08200080 -> 0x00200180

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 13074 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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