On Sat, Jan 02, 2016 at 01:50:49PM -0800, Jeremiah Mahler wrote: > Serge, > > On Sat, Jan 02, 2016 at 12:24:16PM -0600, Serge E. Hallyn wrote: > [...] > > > > Tried to reproduce with setting CONFIG_CFQ_GROUP_IOSCHED=y, but did not > > succeed. Could you send me the .config? Also, if someone could send > > the objdump -d output that might help. Though really, it seems clear > > that current->nsproxy must be NULL. Hm, that's right - we used to have > > that issue in pidns (or was it netns) during process exit. I don't know > > that I'll get time this afternoon, but I'll look into it asap. > > > > thanks. > > Attached is the .config I used. I can send an objdump, but do you want > a dump of the kernel, where the cgroup code is? > > -- > - Jeremiah Mahler Thanks - Shoulda looked at the exit path before - exit_io_context is called after exit_task_namespaces(). I'll have to figure out the best way to handle this. In the past we've restructured exit code to ensure that anything wanting to dereference nsproxy happened before exit_task_namespaces(). However, this is only happening in a debug stmt at blkg_path() in http://lxr.free-electrons.com/source/include/linux/blk-cgroup.h#L344 so simply returning the init_cgroup_namespace is actually the right thing to do. I'm tempted to add a init_cgroup_path() which ignores namespaces, for use in debugging statements. -- To unsubscribe from this list: send the line "unsubscribe cgroups" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
