Re: [PATCH 06/11] rwsem: wake queued readers when writer blocks onactive read lock

[Tony Luck]

On Fri, Aug 13, 2010 at 9:09 AM, Tony Luck <tony.luck@xxxxxxxxx> wrote:
> Still no reports from other architectures? So this still seems to be an
> ia64 specific problem. Time to start reading rwsem.c

My hung process is "make" (GNU Make 3.81). Stuck forever here:

SYSCALL_DEFINE1(brk, unsigned long, brk)
{
        unsigned long rlim, retval;
        unsigned long newbrk, oldbrk;
        struct mm_struct *mm = current->mm;
        unsigned long min_brk;

        down_write(&mm->mmap_sem);  <<<<<<<<<<<<<<<

Is make multi-threaded these days? If not, I'm confused about how anything
complicated could have happened on mmap_sem.

-Tony
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