syzbot

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BUG: KCSAN: data-race in drop_nlink / generic_fillattr

write to 0xffff888129d66d50 of 4 bytes by task 3393 on cpu 0:
 drop_nlink+0x3b/0x90 fs/inode.c:332
 shmem_unlink+0x173/0x190 mm/shmem.c:3039
 shmem_rename2+0x199/0x2f0 mm/shmem.c:3113
 vfs_rename+0x811/0xa40 fs/namei.c:4772
 do_renameat2+0x66f/0x9c0 fs/namei.c:4923
 __do_sys_rename fs/namei.c:4969 [inline]
 __se_sys_rename fs/namei.c:4967 [inline]
 __x64_sys_rename+0x5c/0x70 fs/namei.c:4967
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888129d66d50 of 4 bytes by task 3825 on cpu 1:
 generic_fillattr+0xf3/0x1e0 fs/stat.c:54
 shmem_getattr+0x32a/0x3b0 mm/shmem.c:1068
 vfs_getattr_nosec+0x1e3/0x3c0 fs/stat.c:133
 vfs_getattr fs/stat.c:170 [inline]
 vfs_statx+0x156/0x300 fs/stat.c:242
 vfs_fstatat fs/stat.c:276 [inline]
 __do_sys_newfstatat fs/stat.c:446 [inline]
 __se_sys_newfstatat+0x8a/0x2a0 fs/stat.c:440
 __x64_sys_newfstatat+0x55/0x60 fs/stat.c:440
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00000001 -> 0x00000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3825 Comm: udevd Not tainted 6.2.0-syzkaller-12998-gc0927a7a5391-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023
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