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    SubjectRe: [Feature Request?] Inline compression of process core dumps
    On Thu, 12 Apr 2007 22:22:18 -0400 Christopher S. Aker wrote:

    > Alan Cox wrote:
    > > Indeed. So useful that in current kernels you can set the core dump
    > > path to be
    > >
    > > "|application"
    >
    > Cool stuff! However, it's not working (2.6.20.6):
    >
    > Core dump to |/home/caker/bin/dumper.pl.4442 pipe failed
    >
    > even though...
    >
    > # cat /proc/sys/kernel/core_uses_pid
    > 0
    > # cat /proc/sys/kernel/core_pattern
    > |/home/caker/bin/dumper.pl
    >
    > Looking at the code, it seems to me that format_corename() is appending
    > .pid, regardless if !core_uses_pid and corename[0]=='|', in which case
    > it creates an invalid path for call_usermodehelper_pipe().
    >
    > Bug in the code, or bug in my methods?

    What are you trying to dump? is it a multi-thread group app,
    not a "simple" app? I ask because of this (I'm looking at 2.6.21-rc6)
    <mm_users> reference (not that I know what that is):

    if (!pid_in_pattern
    && (core_uses_pid || atomic_read(&current->mm->mm_users) != 1)) {
    rc = snprintf(out_ptr, out_end - out_ptr,
    ".%d", current->tgid);
    if (rc > out_end - out_ptr)
    goto out;
    out_ptr += rc;
    }

    ---
    ~Randy
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