On Thu, Jan 22, 2009 at 3:35 PM, Paul Menage <menage@xxxxxxxxxx> wrote: > On Thu, Jan 22, 2009 at 3:07 PM, Paul Menage <menage@xxxxxxxxxx> wrote: >>> mount -t cgroup -o freezer,ns none /cgroup >> >> This command should have failed with EBUSY, since freezer is already >> part of an existing hierarchy. So I think it's a red herring in this >> problem. > > But in fact taking out this line does stop the crash. So it's a bug in > the error handling when you try to mount a hierarchy with a subsystem > that's already busy elsewhere. It's due to root_count getting out of sync with reality. It gets incremented in cgroup_get_sb() after we've done all error checking, but decremented in cgroup_kill_sb, which can be called on a superblock that we tried to create but then gave up on. I guess the fix is to increment root_count as soon as we have the superblock. Paul _______________________________________________ Containers mailing list Containers@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/containers
