Date: Sat, 20 Aug 2011 21:50:51 +0100 From: "Steven Hartland" <killing@multiplay.co.uk> To: "Andriy Gapon" <avg@FreeBSD.org> Cc: freebsd-jail@FreeBSD.org, freebsd-stable@FreeBSD.org Subject: Re: debugging frequent kernel panics on 8.2-RELEASE Message-ID: <7585E1DAE11E47488CD5A7F038957F4D@multiplay.co.uk> References: eBSD.org><82E865FBA30747078AF6EE3C1701F973@multiplay.co.uk><4E4FE55A.9000101@FreeBSD.org> <B367F6CE151B4B6A8B0E048022D7F8AB@multiplay.co.uk><D34B2BC140E14E8A8D450474CCC39CB8@multiplay.co.uk> <4E501A6A.3030801@FreeBSD.org>
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----- Original Message -----
From: "Andriy Gapon" <avg@FreeBSD.org>
>> diff -u sys/kern/kern_jail.c.orig sys/kern/kern_jail.c
>> --- sys/kern/kern_jail.c.orig 2011-08-20 21:17:14.856618854 +0100
>> +++ sys/kern/kern_jail.c 2011-08-20 21:18:35.307201425 +0100
>> @@ -2455,7 +2455,8 @@
>> if (--tpr->pr_uref > 0)
>> break;
>> KASSERT(tpr != &prison0, ("prison0 pr_uref=0"));
>> - mtx_unlock(&tpr->pr_mtx);
>> + if (tpr != pr)
>> + mtx_unlock(&tpr->pr_mtx);
>> }
>> /* Done if there were only user references to remove. */
>> if (!(flags & PD_DEREF)) {
>
> Not sure if this would fly as is - please double check the later block where
> pr->pr_mtx is re-locked.
Will do, I'm now 99.9% sure this is the problem and even better I now have a
reproducible scenario :)
Something else you many be more interested in Andriy:-
I added in debugging options DDB & INVARIANTS to see if I can get a more
useful info and the panic results in a looping panic constantly scrolling up
the console. Not sure if this is a side effect of the patches we've been
trying.
Going to see if I can confirm that, lmk if there's something you want me
to try?
Regards
Steve
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