Date: Tue, 25 Sep 2012 14:37:30 -0400 From: John Baldwin <jhb@freebsd.org> To: freebsd-ia64@freebsd.org, Paul Procacci <pprocacci@gmail.com> Cc: geom@freebsd.org Subject: Re: ia64/171814: [panic] bioq_init or bioq_remove (unsure which) Message-ID: <201209251437.30766.jhb@freebsd.org> In-Reply-To: <201209251720.q8PHKE7T072562@freefall.freebsd.org> References: <201209251720.q8PHKE7T072562@freefall.freebsd.org>
next in thread | previous in thread | raw e-mail | index | archive | help
On Tuesday, September 25, 2012 1:20:14 pm Paul Procacci wrote: > The following reply was made to PR ia64/171814; it has been noted by GNATS. > > From: Paul Procacci <pprocacci@gmail.com> > To: John Baldwin <jhb@freebsd.org> > Cc: freebsd-ia64@freebsd.org, freebsd-gnats-submit@freebsd.org > Subject: Re: ia64/171814: [panic] bioq_init or bioq_remove (unsure which) > Date: Tue, 25 Sep 2012 12:11:17 -0500 > > --047d7b66f839532c0a04ca89cbf7 > Content-Type: text/plain; charset=ISO-8859-1 > > Thanks John for your response. > > Here is the output provided what you had explained to do: > > > 0xffffffff80865023 is in devstat_remove_entry > (/usr/src/sys/kern/subr_devstat.c:193). > 188 > 189 /* Remove this entry from the devstat queue */ > 190 atomic_add_acq_int(&ds->sequence1, 1); > 191 if (ds->id == NULL) { > 192 devstat_num_devs--; > 193 STAILQ_REMOVE(devstat_head, ds, devstat, dev_links); > 194 } > 195 devstat_free(ds); > 196 devstat_generation++; > 197 mtx_unlock(&devstat_mutex); I think the devstat entry must have been destroyed twice somehow. Earlier in geom_subr.c the devstat entry is created with a unit of -1: struct g_consumer * g_new_consumer(struct g_geom *gp) { ... cp->stat = devstat_new_entry(cp, -1, 0, DEVSTAT_ALL_SUPPORTED, DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX); } That should result in devstat_new_entry() setting ds->id to 'cp' (which is clearly not NULL), so it shouldn't even attempt the STAILQ_REMOVE(), but that is where it appears to have faulted. -- John Baldwin
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201209251437.30766.jhb>