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Re: libpager deadlock

From: Samuel Thibault
Subject: Re: libpager deadlock
Date: Thu, 8 Apr 2010 13:55:33 +0200
User-agent: Mutt/1.5.12-2006-07-14

Sergio Lopez, le Thu 08 Apr 2010 13:15:20 +0200, a écrit :
> > So it's really hung in the kernel. And indeed, even if from
> > the interface it would seem like it could be asynchronous,
> > the memory_object_lock_completed() call is done from the
> > memory_object_lock_request function itself...
> > 
> But even if m_o_lock_completed is called from m_o_lock_request, that
> answer should come in another message,

Right, but it still means that m_o_lock_request doesn't return before
having completed its job...

> If a thread is stalled in mach_msg_trap(), that means the kernel can't
> enqueue the message for some reason (and this is very, very bad). Is
> possible that ext2fs had a huge number of threads at that moment?

No, just a few dozens.


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