syzbot

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BUG: KCSAN: data-race in shmem_unlink / vfs_getattr_nosec

write to 0xffff888103136cc8 of 8 bytes by task 2131 on cpu 1:
 shmem_unlink+0x117/0x1a0 mm/shmem.c:2932
 shmem_rename2+0x199/0x2d0 mm/shmem.c:3008
 vfs_rename+0x9d9/0xe00 fs/namei.c:4626
 do_renameat2+0x6d7/0xa20 fs/namei.c:4777
 __do_sys_rename fs/namei.c:4823 [inline]
 __se_sys_rename fs/namei.c:4821 [inline]
 __x64_sys_rename+0x58/0x60 fs/namei.c:4821
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888103136cc8 of 8 bytes by task 1910 on cpu 0:
 i_size_read include/linux/fs.h:891 [inline]
 generic_fillattr fs/stat.c:53 [inline]
 vfs_getattr_nosec+0x242/0x2f0 fs/stat.c:126
 vfs_getattr fs/stat.c:160 [inline]
 vfs_statx+0x138/0x2a0 fs/stat.c:225
 vfs_fstatat fs/stat.c:243 [inline]
 __do_sys_newfstatat fs/stat.c:412 [inline]
 __se_sys_newfstatat+0x63/0x260 fs/stat.c:406
 __x64_sys_newfstatat+0x51/0x60 fs/stat.c:406
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000000001ba8 -> 0x0000000000001b94

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1910 Comm: udevd Not tainted 5.16.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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