Thomas Bushnell BSG, le Sun 09 Mar 2008 22:17:05 -0400, a écrit : > On Mon, 2008-03-10 at 01:19 +0000, Samuel Thibault wrote: > > This thread is syncing everything, i.e. asking a lot of writes, which > > triggers the creation of a lot of threads. Unfortunately the superblock > > was paged out, so they all block on reading it. Unfortunately, since in > > Debian there is a patch which limits the number of created threads, > > the read of the superblock doesn't actually create a new thread, that is > > delayed. But since none of the existing threads can progress (since > > they are all waiting for the super block), things are just dead > > locked... > > As a general rule, the Hurd always assumes that an RPC can be handled; > this is quite emebedded in the way diskfs works. > > A patch which limits the number of threads is inherently buggy in the > Hurd, and that patch MUST be disabled for anything to work properly.
Well, there is still a limit in the number of threads in the kernel itself: THREAD_MAX... Yes, that should too be dynamically expandable... > > I'm currently using a quite ugly patch (on top of the >2GB patch) to > > avoid this by just always keeping a copy of the superblock, attached. > > I'll commit it in the Debian package. > > This is not a fix. This just postpones the problem. It makes it much less frequent, which is good for the Debian buildd for instance. Samuel
