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Date: Wed, 15 Apr 2009 11:14:38 +0200
To: "Oleg V. Nauman" <oleg@opentransfer.com>, freebsd-stable@freebsd.org
From: "Ronald Klop" <ronald-freebsd8@klop.yi.org>
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Subject: Re: 7.2-PRERELEASE: make process waiting indefinitely
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On Tue, 14 Apr 2009 15:04:11 +0200, Oleg V. Nauman <oleg@opentransfer.com>  
wrote:

>
>   Have experienced today strange issue with my fresh RELENG_7 ( sources  
> from yesterday April 13, userland and kernel in sync ) - sometimes some  
> processes stop running without any visible reason. Have seen it twice  
> today during KDE compilation - make process just waiting for something  
> while nothing else compiles or some other way prevents this process from  
> running ( no SIGSTOP performed, no Ctrl-S performed on console). Well it  
> possible related to ( or triggered by ) new ports compilation feature  
> for SMP machines ( most of KDE port marked as MAKE_JOBS_SAFE=yes ) but  
> anyway this stuck process behavior is strange. kill -SIGCONT not helps,  
> but it killable ( Ctrl-C helps at least )
> Well some info related to this process:
> procstat -t 63472 output:
>
>    PID    TID COMM             TDNAME           CPU  PRI STATE   WCHAN
> 63472 100059 make             -                  1   92 sleep   wait
>
> procstat -kk 63472 output:
>
>    PID    TID COMM             TDNAME           KSTACK
> 63472 100059 make             -                mi_switch+0x2c8  
> sleepq_switch+0xd9 sleepq_catch_signals+0x239 sleepq_wait_sig+0x14  
> _sleep+0x307 kern_wait+0xa36 wait4+0x3b syscall+0x2b3  
> Xint0x80_syscall+0x20
>
> Some related sysctls output:
>
> kern.smp.cpus: 2
> kern.smp.disabled: 0
> kern.smp.active: 1
>
> uname -msr output:
> FreeBSD 7.2-PRERELEASE i386

It sounds like  
http://www.mail-archive.com/freebsd-stable@freebsd.org/msg102628.html .
There are some tips in that mailthread about debugging it.

Ronald.