syzbot

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BUG: KCSAN: data-race in generic_fillattr / shmem_unlink

read-write to 0xffff8881049a8d58 of 8 bytes by task 3156 on cpu 1:
 shmem_unlink+0x102/0x190 mm/shmem.c:3048
 shmem_rename2+0x199/0x2f0 mm/shmem.c:3125
 vfs_rename+0x811/0xa40 fs/namei.c:4849
 do_renameat2+0x682/0xa90 fs/namei.c:5002
 __do_sys_rename fs/namei.c:5048 [inline]
 __se_sys_rename fs/namei.c:5046 [inline]
 __x64_sys_rename+0x5c/0x70 fs/namei.c:5046
 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 0xffff8881049a8d58 of 8 bytes by task 3573 on cpu 0:
 i_size_read include/linux/fs.h:883 [inline]
 generic_fillattr+0x13f/0x1e0 fs/stat.c:58
 shmem_getattr+0x32a/0x3b0 mm/shmem.c:1076
 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: 0x00000000000016a8 -> 0x0000000000001694

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3573 Comm: udevd Not tainted 6.4.0-rc4-syzkaller-00031-g8b817fded42d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
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