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    SubjectRe: [PATCH 06/11] rwsem: wake queued readers when writer blocks on active read lock
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    On Fri, Aug 13, 2010 at 9:09 AM, Tony Luck <tony.luck@intel.com> 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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