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BUG: KCSAN: data-race in do_writev / do_writev

write to 0xffff888104322b68 of 8 bytes by task 2581 on cpu 1:
 do_writev+0x35d/0x4d0 fs/read_write.c:969
 __do_sys_writev fs/read_write.c:1040 [inline]
 __se_sys_writev fs/read_write.c:1037 [inline]
 __x64_sys_writev+0x41/0x50 fs/read_write.c:1037
 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

write to 0xffff888104322b68 of 8 bytes by task 2580 on cpu 0:
 do_writev+0x35d/0x4d0 fs/read_write.c:969
 __do_sys_writev fs/read_write.c:1040 [inline]
 __se_sys_writev fs/read_write.c:1037 [inline]
 __x64_sys_writev+0x41/0x50 fs/read_write.c:1037
 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: 0x0000000000000ff0 -> 0x0000000000002fae

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 2580 Comm: syz-executor.0 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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