Messages in this thread | | | Date | Mon, 01 Aug 2011 18:43:07 +0100 | From | Marc Zyngier <> | Subject | Re: shm updates broke UML |
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On 01/08/11 18:32, Vasiliy Kulikov wrote: > Marc, > > On Mon, Aug 01, 2011 at 21:24 +0400, Vasiliy Kulikov wrote: >> On Mon, Aug 01, 2011 at 19:19 +0200, Marc Zyngier wrote: >>> Here you go (sorry about the line wrapping, damned webmail...): >> >> Thank you! Now I see that the problem is rw_mutex is not initialized: >> >> down_write(&shm_ids(ns).rw_mutex); >> >> void __sched __down_write_nested(struct rw_semaphore *sem, int subclass) >> { >> ... >> if (sem->activity == 0 && list_empty(&sem->wait_list)) { >> ^^^^^^^^^^^^^^^ is NULL >> >> Wtf - ipc namespace should be fully initialized for the moment of >> threads run... > > Does ARM try to run _any_ threads before do_initcalls()? IPC > initialization is initcall, so any thread before do_initcalls() is a > dependency bug.
I don't think it does anything different from other architectures. The crash I'm observing seem to be from kworker, which is created from an early_initcall (kernel/workqueue.c).
This looks very much like a generic problem to me.
M. -- Jazz is not dead. It just smells funny...
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