debugging frequent kernel panics on 8.2-RELEASE

[Steven Hartland]

----- Original Message ----- 
From: "Andriy Gapon" <avg at FreeBSD.org>
To: "Steven Hartland" <killing at multiplay.co.uk>
Cc: <freebsd-stable at FreeBSD.org>
Sent: Tuesday, August 16, 2011 9:30 PM
Subject: Re: debugging frequent kernel panics on 8.2-RELEASE


> on 15/08/2011 17:56 Steven Hartland said the following:
>> (kgdb) x/512a 0xffffff8d8f357210
> [snip]
> 
> Can you please also provide the following for this core?
> list *vm_map_growstack+93
> list *lim_cur+17
> list *lim_rlimit+18
> 
> Also, it would be interesting to get panic output with DDB option.

Here's the info:-

(kgdb) list *vm_map_growstack+93
0xffffffff80543ffd is in vm_map_growstack (/usr/src/sys/vm/vm_map.c:3305).
3300            struct uidinfo *uip;
3301
3302    Retry:
3303            PROC_LOCK(p);
3304            stacklim = lim_cur(p, RLIMIT_STACK);
3305            vmemlim = lim_cur(p, RLIMIT_VMEM);
3306            PROC_UNLOCK(p);
3307
3308            vm_map_lock_read(map);
3309
(kgdb) list *lim_cur+17
0xffffffff80384681 is in lim_cur (/usr/src/sys/kern/kern_resource.c:1150).
1145    rlim_t
1146    lim_cur(struct proc *p, int which)
1147    {
1148            struct rlimit rl;
1149
1150            lim_rlimit(p, which, &rl);
1151            return (rl.rlim_cur);
1152    }
1153
1154    /*
(kgdb) list *lim_rlimit+18
0xffffffff80384632 is in lim_rlimit (/usr/src/sys/kern/kern_resource.c:1165).
1160    {
1161
1162            PROC_LOCK_ASSERT(p, MA_OWNED);
1163            KASSERT(which >= 0 && which < RLIM_NLIMITS,
1164                ("request for invalid resource limit"));
1165            *rlp = p->p_limit->pl_rlimit[which];
1166            if (p->p_sysent->sv_fixlimit != NULL)
1167                    p->p_sysent->sv_fixlimit(rlp, which);
1168    }
1169

I've yet to have the machine with DDB + expanded stack panic.

I plan to leave it a day or so more then try a reboot to see if that
triggers it. If not I'll drop the stack back down to 4 and see if that
enables us to get another panic.

    Regards
    Steve

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