fche changed the topic of #systemtap to: http://sourceware.org/systemtap; email systemtap@sourceware.org if answers here not timely, conversations may be logged
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<agentzh> it can reproduce the NULL .path in _stp_module_N in the stap_symbols.c file generated in the tmp dir.
<agentzh> though it's not easy to reproduce panic with this simple script.
<fche> that looks pretty vanilla eh
<fche> so what would trigger the panic? heavy process activity during the timer.profile timeframe or such?
<fche> hmmmm
<fche> a sprint_ubacktrace() hitting during a vdso execution? weird.
<agentzh> a sec, i'll paste the panic backtrace
<agentzh> this is the dmesg part for the panic.
<agentzh> i've noted that on fedora, there is no such "kernel" _stp_module_N struct at all.
<agentzh> only on centos 6.
<fche> ok, still worth fixing
<fche> line 29 is where things go bad
<agentzh> yep
<agentzh> it's the m->path[0] deferencing.
<agentzh> i've checked the assembly and register.
<agentzh> *dereferencing
<fche> yeah
<agentzh> will commit my patch.
<fche> thanks dude, nice find
<agentzh> sure thing.
<fche> the code dates from 2010
<fche> surprised not have hit this earlier
<agentzh> my script triggering the panic is really complex :)
<fche> more curious about the workload -- your simplified .stp script was scary simple
<agentzh> it worked fine on fed 28/30/31/32, ubuntu 16/18/20, centos 7/8, rhel 7/8, amazon 1/2, ane etc. but just crashed on centos 6.
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<agentzh> not much workload, just a process hanging on sleep.
<agentzh> an nginx process.
<agentzh> for the real thing.
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<irker915> systemtap: yichun systemtap.git:master * release-4.2-70-g6ec3b7c02 / runtime/vma.c: Runtime: _stp_vma_match_vdso: fixed a NULL pointer dereference bug in m->path[0].
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<irker812> systemtap: fche systemtap.git:master * release-4.2-72-g54df6ebd7 / NEWS elaborate.h man/stapprobes.3stap staptree.cxx tapsets.cxx testsuite/buildok/contextfuns.stp: PR25841: support context vars in functions called from process.mark probes
<irker812> systemtap: fche systemtap.git:master * release-4.2-71-g999a6a9be / man/stappaths.7.in: stappaths: add debuginfod commentary
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<irker812> systemtap: fche systemtap.git:master * release-4.2-73-g4d0885661 / tapsets.cxx: PR25841: c++11 dumb down iteration
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