Date: Wed, 7 Oct 2015 23:05:11 +0200 (CEST) From: Christian Kratzer <ck-lists@cksoft.de> To: John Baldwin <jhb@freebsd.org> Cc: Rick Macklem <rmacklem@uoguelph.ca>, freebsd-stable@freebsd.org Subject: Re: smbfs crashes since approx. 10.1-RELEASE Message-ID: <alpine.BSF.2.20.1510072256360.71292@noc1.cksoft.de> In-Reply-To: <3563189.eDHDcCgW5L@ralph.baldwin.cx> References: <alpine.BSF.2.20.1510051157450.16263@noc1.cksoft.de> <2148690.gx9M0ZzrG1@ralph.baldwin.cx> <alpine.BSF.2.20.1510070844030.16263@noc1.cksoft.de> <3563189.eDHDcCgW5L@ralph.baldwin.cx>
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Hi John,
On Wed, 7 Oct 2015, John Baldwin wrote:
>> mtx_lock = 1444181401}
>
> Ok, so that is a destroyed mutex. This means it is probably not Giant, and
> it might be some mutex in smb_iod_main() that shows up in smb_iod_thread() due
> to inlining.
>
> Actually, we know this from your earlier mail:
>
> if (evp->ev_type & SMBIOD_EV_SYNC) {
> SMB_IOD_EVLOCK(iod);
> wakeup(evp);
> SMB_IOD_EVUNLOCK(iod);
>
> Line 624 is that SMB_IOD_EVUNLOCK().
>
> Hmm, does 'p *evp' work at frame 10? If not, can you try building the
> devel/gdb port from a recent ports tree with the 'KGDB' option enabled and
> use 'kgdb710' instead of 'kgdb' to see if you can print out '*evp'?
kgdb hangs when chaning to frame10. I will build the port later (svn ports checkout in progress)
I have cloned the VM so that I have this isolated from my production network.
>> (kgdb)
>> --snipp--
>>
>> I can build a GENERIC kernel with INVARIANTS enabled on the box to see if we get a better assertions next time this happens.
>
> That would be great, but please keep the existing core and kernel. We might
> be able to figure this out from that still.
>
> Also, go ahead and put this patch in and let me know if you ever see the
> printf logged. If you do, that could explain this panic (and we might need
> a more involved fix to avoid memory leaks).
>
> Index: smb_iod.c
> ===================================================================
> --- smb_iod.c (revision 288952)
> +++ smb_iod.c (working copy)
> @@ -624,6 +624,13 @@
> SMB_IOD_EVUNLOCK(iod);
> } else
> free(evp, M_SMBIOD);
> + if (iod->iod_flags & SMBIOD_SHUTDOWN) {
> + if (!STAILQ_EMPTY(&iod->iod_evlist))
> + printf("%s: shutdown with pending events\n",
> + __func__);
> + }
> + return;
> + }
> }
> #if 0
> if (iod->iod_state == SMBIOD_ST_VCACTIVE) {
The vm is now runnning lates 10-stable kernel with above patch and invariants enabled.
Give it about 2 days to produce the next crash.
Greetings
Christian
--
Christian Kratzer CK Software GmbH
Email: ck@cksoft.de Wildberger Weg 24/2
Phone: +49 7032 893 997 - 0 D-71126 Gaeufelden
Fax: +49 7032 893 997 - 9 HRB 245288, Amtsgericht Stuttgart
Mobile: +49 171 1947 843 Geschaeftsfuehrer: Christian Kratzer
Web: http://www.cksoft.de/
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