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From: John Baldwin <jhb@freebsd.org>
To: rank1seeker@gmail.com
Subject: Re: UFS related panic (daily <-> find)
Date: Fri, 26 Jul 2013 11:16:58 -0400
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On Friday, July 26, 2013 9:04:42 am rank1seeker@gmail.com wrote:
> > > I had 2 panics: (Both occured at 3 AM, so had to be daily task)
> > > 
> > > First (Jul  2 03:06:50 2013):
> > > --
> > > Fatal trap 12: page fault while in kernel mode
> > > fault virtual address   = 0x19
> > > fault code              = supervisor read, page not present
> > > instruction pointer     = 0x20:0xc06caf34
> > > stack pointer           = 0x28:0xe76248fc
> > > frame pointer           = 0x28:0xe7624930
> > > code segment            = base 0x0, limit 0xfffff, type 0x1b
> > >                         = DPL 0, pres 1, def32 1, gran 1
> > > processor eflags        = interrupt enabled, resume, IOPL = 0
> > > current process         = 76562 (find)
> > > trap number             = 12
> > > panic: page fault
> > > Uptime: 23h0m41s
> > > Physical memory: 1014 MB
> > > Dumping 186 MB: 171 155 139 123 107 91 75 59 43 27 11
> > > 
> > > #7  0xc06caf34 in cache_lookup_times (dvp=0xc784a990, vpp=0xe7624ae8,
> > >     cnp=0xe7624afc, tsp=0x0, ticksp=0x0) at 
> > /usr/src/sys/kern/vfs_cache.c:547
> > 
> > Can you go up to this frame and do 'l'?
> > 
> > -- 
> > John Baldwin
> 
> 
> Sure,
> 
> ---------
> (kgdb) up 7
> #7  0xc06caf34 in cache_lookup_times (dvp=0xc784a990, vpp=0xe7624ae8, cnp=0xe7624afc, tsp=0x0, ticksp=0x0) at /usr/src/sys/kern/vfs_cache.c:547
> 547                     numchecks++;
> ---------
> (kgdb) l
> 542             }
> 543
> 544             hash = fnv_32_buf(cnp->cn_nameptr, cnp->cn_namelen, FNV1_32_INIT);
> 545             hash = fnv_32_buf(&dvp, sizeof(dvp), hash);
> 546             LIST_FOREACH(ncp, (NCHHASH(hash)), nc_hash) {
> 547                     numchecks++;
> 548                     if (ncp->nc_dvp == dvp && ncp->nc_nlen == cnp->cn_namelen &&
> 549                         !bcmp(nc_get_name(ncp), cnp->cn_nameptr, ncp->nc_nlen))
> 550                             break;
> 551             }
> ---------

Hmm, 'p ncp' and 'p *ncp' at that frame perhaps?

-- 
John Baldwin