syzbot

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BUG: KCSAN: data-race in drop_nlink / generic_fillattr

write to 0xffff8881043246a8 of 4 bytes by task 3281 on cpu 0:
 drop_nlink+0x3b/0x90 fs/inode.c:332
 shmem_unlink+0x169/0x180 mm/shmem.c:3370
 shmem_rename2+0x1dc/0x2c0 mm/shmem.c:3449
 vfs_rename+0x867/0x9c0 fs/namei.c:4879
 do_renameat2+0x732/0xa50 fs/namei.c:5036
 __do_sys_rename fs/namei.c:5083 [inline]
 __se_sys_rename fs/namei.c:5081 [inline]
 __x64_sys_rename+0x5c/0x70 fs/namei.c:5081
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x59/0x120 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff8881043246a8 of 4 bytes by task 3485 on cpu 1:
 generic_fillattr+0xf8/0x2f0 fs/stat.c:55
 shmem_getattr+0x17b/0x200 mm/shmem.c:1139
 vfs_getattr_nosec fs/stat.c:135 [inline]
 vfs_getattr fs/stat.c:176 [inline]
 vfs_fstat+0x1b5/0x460 fs/stat.c:198
 vfs_fstatat+0x85/0x100 fs/stat.c:300
 __do_sys_newfstatat fs/stat.c:468 [inline]
 __se_sys_newfstatat+0x58/0x260 fs/stat.c:462
 __x64_sys_newfstatat+0x55/0x60 fs/stat.c:462
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x59/0x120 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x00000001 -> 0x00000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3485 Comm: udevd Not tainted 6.8.0-rc1-syzkaller-00169-gecb1b8288dc7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
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