On Mon, Feb 09, 2009 at 10:59:38AM +0700, Eugene Grosbein wrote: > Hi! > > I've RELENG_6 system controlling local PBX through RS-232 port, sio(4). > It also runs syslogd, cron, sshd, bsnmpd and sendmail for outgoing reports. > > It locks very often: it answers to pings but PBX controlling software stops > responding, local and remote login attempts hang due to 'login' process > stuck in 'sysctl lock' state. Local consoles do switch with 'Alt-Fn' > and DDB works. It shows that sendmail is in 'sysctl lock' state too. > > This is NanoBSD installation running from IDE flash, it's swapless > but I think I could manage to obtain crashdump if there is an interest of it. > > I've digged commit logs a bit and found this change MFC'd to RELENG_7 > but not RELENG_6: > > http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/kern/kern_sysctl.c#rev1.177.6.2 > > It seems RELENG_6 needs this too, doesn't it? > I'm going to merge the change to RELENG_6 and give it a try.
Yes, please give it a try. In fact, it was quite specific situation that I observed and produced a fix for. You need execing process that needs to grab Giant, e.g. due to image being located on !MPSAFE fs, and simultaneous sysctl issued that inspects this process.
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