Date: Thu, 06 Jul 2023 19:42:05 -0500 From: Mike Karels <mike@karels.net> To: John F Carr <jfc@mit.edu> Cc: Mark Millard <marklmi@yahoo.com>, Current FreeBSD <freebsd-current@freebsd.org>, freebsd-arm <freebsd-arm@freebsd.org> Subject: 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 Message-ID: <3404EA26-BFDD-4B87-830B-62CB6E91C0BD@karels.net> In-Reply-To: <C0D78776-E8DF-4141-B636-658116E94DBC@mit.edu> References: <7A41DED4-876F-4270-A980-549A4832B39A.ref@yahoo.com> <7A41DED4-876F-4270-A980-549A4832B39A@yahoo.com> <C0D78776-E8DF-4141-B636-658116E94DBC@mit.edu>
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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
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