On Fri, Apr 04, 2014 at 05:15:23PM -0400, Sasha Levin wrote: > On 03/26/2014 01:01 PM, Jeff Mahoney wrote: > > On 3/17/14, 9:05 AM, David Sterba wrote: > >>> On Fri, Mar 14, 2014 at 08:12:16PM -0400, Sasha Levin wrote: > >>>>> While fuzzing with trinity inside a KVM tools guest running the latest -next kernel I've stumbled on the following: > >>>>> > >>>>> [ 788.458756] CPU0 CPU1 [ 788.459188] ---- ---- [ 788.459625] lock(&found->groups_sem); [ 788.460041] local_irq_disable(); [ 788.460041] lock(&delayed_node->mutex); [ 788.460041] lock(&found->groups_sem); [ 788.460041] <Interrupt> [ 788.460041] lock(&delayed_node->mutex); [ 788.460041] [ 788.460041] *** DEADLOCK *** [ 788.460041] [ 788.460041] 2 locks held by kswapd3/4199: > >>> > >>> I've once (3.14-rc5) seen the same warning also caused by xfstests/generic/224 > > I think this is from my sysfs patches. We call kobject_add while holding the group_sem. kobject_add ultimately allocates with GFP_KERNEL, so it can enter reclaim. This particular case isn't dangerous, but it could hit while hot-adding a device. The fix should be pretty simple. > > Is that fix available anywhere? I'm still seeing the issue in -next. It is: https://patchwork.kernel.org/patch/3894781/ , will probably hit -rc2 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
