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Date:      Tue, 14 Apr 2009 16:04:11 +0300
From:      "Oleg V. Nauman" <oleg@opentransfer.com>
To:        freebsd-stable@freebsd.org
Subject:   7.2-PRERELEASE: make process waiting indefinitely
Message-ID:  <20090414160411.042472seockg0css@webmail.opentransfer.com>

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  Have experienced today strange issue with my fresh RELENG_7 ( =20
sources from yesterday April 13, userland and kernel in sync ) - =20
sometimes some processes stop running without any visible reason. Have =20
seen it twice today during KDE compilation - make process just waiting =20
for something while nothing else compiles or some other way prevents =20
this process from running ( no SIGSTOP performed, no Ctrl-S performed =20
on console). Well it possible related to ( or triggered by ) new ports =20
compilation feature for SMP machines ( most of KDE port marked as =20
MAKE_JOBS_SAFE=3Dyes ) but anyway this stuck process behavior is =20
strange. kill -SIGCONT not helps, but it killable ( Ctrl-C helps at =20
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 =20
sleepq_switch+0xd9 sleepq_catch_signals+0x239 sleepq_wait_sig+0x14 =20
_sleep+0x307 kern_wait+0xa36 wait4+0x3b syscall+0x2b3 =20
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





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