[Bug runtime/16278] New: orphaned stapsh goes to 100% CPU after stap closing

jlebon at redhat dot com sourceware-bugzilla@sourceware.org
Sat Nov 30 18:33:00 GMT 2013


https://sourceware.org/bugzilla/show_bug.cgi?id=16278

            Bug ID: 16278
           Summary: orphaned stapsh goes to 100% CPU after stap closing
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
          Assignee: systemtap at sourceware dot org
          Reporter: jlebon at redhat dot com

When using --remote <ssh-remote>, if for some reason stap hangs during passes
1-4 and must be killed with SIGINT, the orphaned stapsh on the remote keeps
running. Not only that, it starts using up 100% CPU.

One way to get stap to hang is (prior to the fix from PR16276) to run the
following to get the server to fail (this is prior to the fix from PR16276):

stap -L 'kernel.trace("kfree_skb")' --remote <ssh-remote> --use-server <server>

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