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Date:      Sat, 13 Sep 2014 02:38:39 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-bugs@FreeBSD.org
Subject:   [Bug 193593] New: [dtrace] root@test3:/home/adrian/git/norse/dsniff # dtrace -n 'pid$target:libc*:flockfile:entry { @[execname, ustack()] = count(); } END { trunc(@, 10); }' -p 44592 dtrace: description 'pid$target:libc*:flockfile:entry ' matched 2 probes Segmentation faul
Message-ID:  <bug-193593-8@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193593

            Bug ID: 193593
           Summary: [dtrace] root@test3:/home/adrian/git/norse/dsniff #
                    dtrace -n 'pid$target:libc*:flockfile:entry {
                    @[execname, ustack()] = count(); } END { trunc(@, 10);
                    }' -p 44592 dtrace: description
                    'pid$target:libc*:flockfile:entry ' matched 2 probes
                    Segmentation faul
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs@FreeBSD.org
          Reporter: adrian@freebsd.org

When dtrac'ing a process that does a lot of fprintf()s:

root@test3:/home/adrian/git/norse/dsniff # dtrace -n
'pid$target:libc*:flockfile:entry { @[execname, ustack()] = count(); } END {
trunc(@, 10); }' -p 44592
dtrace: description 'pid$target:libc*:flockfile:entry ' matched 2 probes
Segmentation fault (core dumped)

.. and the original process just vanishes.

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