Re: For snapshot builds: armv7 chroot on aarch64 has kyua test -k /usr/tests/Kyuafile sys/kern/kern_copyin hung up [in getpid?], unkillable, prevents reboot

From: Mike Karels <mike_at_karels.net>
Date: Fri, 07 Jul 2023 00:42:05 UTC 
On 6 Jul 2023, at 18:53, John F Carr wrote:

> The hang is caused by the sysctl call in tests/sys/kern/kern_copyin.c.  The function below hangs when called in a 32 bit ARM process running in a chroot environment on a 64 bit ARM system.  I will write up a bug report.
>
> static int
> get_vm_layout(struct kinfo_vm_layout *kvm)
> {
> 	size_t len;
> 	int mib[4];
>
> 	mib[0] = CTL_KERN;
> 	mib[1] = KERN_PROC;
> 	mib[2] = KERN_PROC_VM_LAYOUT;
> 	mib[3] = getpid();
> 	len = sizeof(*kvm);
>
> 	return (sysctl(mib, nitems(mib), kvm, &len, NULL, 0));
> }

Thanks for isolating this.  Let me know when you have the bug number.
I just tested a fix (the compat code drops the reference on the current
address space an extra time, probably freeing it).

		Mike