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BUG: KCSAN: data-race in d_make_discardable / dentry_kill

write to 0xffff88810737b3c0 of 4 bytes by task 3652 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:3951
 vfs_unlink+0x1c3/0x490 fs/namei.c:5649
 filename_unlinkat+0x1dc/0x410 fs/namei.c:5719
 __do_sys_unlink fs/namei.c:5754 [inline]
 __se_sys_unlink+0x2b/0xe0 fs/namei.c:5751
 __x64_sys_unlink+0x1f/0x30 fs/namei.c:5751
 x64_sys_call+0x18ee/0x2550 arch/x86/include/generated/asm/syscalls_64.h:88
 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 0xffff88810737b3c0 of 4 bytes by task 3651 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_dirop fs/namei.c:2956 [inline]
 filename_unlinkat+0x217/0x410 fs/namei.c:5722
 __do_sys_unlink fs/namei.c:5754 [inline]
 __se_sys_unlink+0x2b/0xe0 fs/namei.c:5751
 __x64_sys_unlink+0x1f/0x30 fs/namei.c:5751
 x64_sys_call+0x18ee/0x2550 arch/x86/include/generated/asm/syscalls_64.h:88
 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 -> 0x00000080

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3651 Comm: syz-executor220 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
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