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Differential D14638

postmortem DTrace frequently broken under vmware
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Authored by sam_samgwydir.com on Mar 10 2018, 7:37 AM.
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gnn
Summary

Here is the bug ticket from illumos:
https://illumos.org/issues/9058

When debugging cores created with postmortem DTrace (http://dtrace.org/guide/chp-post.html) under VMWare fusion, mdb would often crash. It turned out a bug in how libdtrace consumed the tracing data stored inside the core.

Test Plan

Tested on SmartOS/illumos, used to debug the ongoing bhyve/illumos effort.

I need to re-create this problem on FreeBSD. I'll report back when that is done.

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sam_samgwydir.com created this revision.Mar 10 2018, 7:37 AM
Herald added a reviewer: gnn. · View Herald TranscriptMar 10 2018, 7:37 AM
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markj added a subscriber: markj.Mar 10 2018, 4:07 PM

Awesome! I've seen reports of this issue on FreeBSD but haven't reproduced it myself. See https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218452

I'll review this later this weekend.

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cddl/
contrib/
opensolaris/
lib/
libdtrace/
common/
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cddl/contrib/opensolaris/lib/libdtrace/common/dt_consume.c

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