On Sat, Sep 05, 2015 at 04:34:39PM +0100, Richard W.M. Jones wrote:
> [ 52.259269] BUG: unable to handle kernel NULL pointer dereference at
> 00000000000009c8
> [ 52.259269] IP: [<ffffffff813f8b10>] __blkg_lookup+0x40/0xe0
And also:
$ addr2line -e
/usr/lib/debug/lib/modules/4.3.0-0.rc0.git7.1.rwmj3.fc24.x86_64/vmlinux
ffffffff813f8b10
/usr/src/debug/kernel-4.2.fc24/linux-4.3.0-0.rc0.git7.1.rwmj3.fc24.x86_64/block/blk-cgroup.c:158
152 /*
153 * Hint didn't match. Look up from the radix tree. Note that
the
154 * hint can only be updated under queue_lock as otherwise @blkg
155 * could have already been removed from blkg_tree. The caller
is
156 * responsible for grabbing queue_lock if @update_hint.
157 */
158 blkg = radix_tree_lookup(&blkcg->blkg_tree, q->id);
159 if (blkg && blkg->q == q) {
160 if (update_hint) {
161 lockdep_assert_held(q->queue_lock);
162 rcu_assign_pointer(blkcg->blkg_hint, blkg);
163 }
164 return blkg;
165 }
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
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