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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<vbernat> hey! I am trying to run this script (with -x PID):
<vbernat> For some reason, it always halt pretty fast with:
<vbernat> WARNING: Missing unwind data for a module, rerun with 'stap -d (unknown; retry with -DDEBUG_UNWIND)'
<vbernat> WARNING: too many pending (warning) messages
<vbernat> ERROR: too many pending (error) messages
<vbernat> WARNING: Number of errors: 1, skipped probes: 0
<vbernat> --vp 00002 doesn't help much
<vbernat> is the first warning important?
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<fche> hi vbernat
<vbernat> hey!
<fche> that warning means that the user-backtracing related calls your script is making could not be satisfied due to lack of information
<fche> however
<fche> that is a soft sort of problem - just means that a backtrace will be empty or something
<fche> it should not -cause- further failures. if even multiple of them escalate into an error, that's a bug
<vbernat> when the script is able to produce a backtrace, almost all symbols are here, I wouldn't mind if some symbols are missing
<vbernat> with --vp 0002, the warning message is repeated during the run
<vbernat> it's systemtap 3.0, on Ubuntu Xenial, kernel 4.4, libelf 0.165
<fche> can you do a stap ... -d /proc/$PID/exe just for giggles?
<fche> basically to feed it the data it would like
<vbernat> I am already doing -d /usr/bin/theexecfile
<vbernat> I am trying with /proc...
<fche> if you know theexecfile, that should work too -- though something must be wrong since stap ought to have printed that file name instead of 'unknown'
<vbernat> still the same errors
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<fche> ok, we should be able to improve on this
<fche> would you mind filing a bug, with the c program too (or reproduction instructions) ?
<vbernat> I need to find a reproducer then, program is closed source
<fche> hm anything with lots of close / read ought to do :) maybe even /usr/bin/find
<fche> sorry, /me has to step to a meeting awhile
<vbernat> no problem
<lorddoskias1> how come the caller_addr can be different than the address printed by print_backtrace, in the string" returning to"
<fche> from the .return probe, the stacks are a bit messed up by the kernel
<lorddoskias1> i'm seeing : Caller is: seq_read 0xffffffff811fca71
<lorddoskias1> Returning to : 0xffffffff81256730 : show_stat+0x90/0x870 [kernel]
<lorddoskias1> Returning from: 0xffffffff81081f10 : sched_group_get_cpucount+0x0/0x20 [kernel]
<lorddoskias1> so the "caller is" stuff is printed from caller() function
<lorddoskias1> but print_backtrace has the correct functino (show_stat)
<fche> the latter (only) may know how to compensate for the return-probe phenomena
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<fche> at least we should document that, in [man function::caller] if nowhere else
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<lorddoskias1> hm, but backtrace() does return the correct set of addresses
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<lorddoskias1> so does callers(1)
<lorddoskias1> and callers(0)
<lorddoskias1> the latter would do the trick for me
<lorddoskias1> fche: that might have something to do with inlining
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<lorddoskias1> fche: is there a way to cast a string to long, eg: symname(callers(0))
<lorddoskias1> i want this to work?
<fche> strtol()
<lorddoskias1> ah...
<lorddoskias1> i was looking for stringtoxxx etc :d
<lorddoskias1> the obvious thing should always be used...
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<lorddoskias1> fche: is ti a problem if i'm using an older stap version to run a compiled module, than the one used to produce the module?
<fche> conceivable but should not relate to this aspect
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<irker904> systemtap: mcermak systemtap.git:refs/heads/mcermak/variance * release-3.0-199-g61e24c6 / runtime/map.c runtime/stat-common.c runtime/stat.c runtime/stat.h: Implement @variance for PMAPs (maps of stats) too. http://tinyurl.com/glrjejn
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<irker904> systemtap: fche systemtap.git:refs/heads/master * release-3.0-230-g62aeafd / translate.cxx: tweak error message for exhausted-overloaded-functions http://tinyurl.com/zvw32ab
<irker904> systemtap: rth systemtap.git:refs/heads/rth/loc2s * release-3.0-167-gd6e1fb6 / elaborate.cxx elaborate.h staptree.cxx staptree.h translate.cxx: Add target_register expression http://tinyurl.com/gml56u7
<irker904> systemtap: rth systemtap.git:refs/heads/rth/loc2s * release-3.0-168-g217e4eb / elaborate.cxx elaborate.h staptree.cxx staptree.h translate.cxx: Add target_deref expression http://tinyurl.com/hhusbt7
<irker904> systemtap: rth systemtap.git:refs/heads/rth/loc2s * release-3.0-241-g96d8c29 / : Merge branch 'master' into rth/bpf http://tinyurl.com/h8k5bom
<irker904> systemtap: rth systemtap.git:refs/heads/rth/loc2s * release-3.0-242-gc485cff / Makefile.am Makefile.in doc/beginners/Makefile.in dwflpp.cxx dwflpp.h java/Makefile.in loc2stap.cxx loc2stap.h tapsets.cxx: tmp1 http://tinyurl.com/gs728th
<irker904> systemtap: rth systemtap.git:refs/heads/rth/loc2s * release-3.0-243-gf8e5c86 / dwflpp.cxx dwflpp.h loc2stap.cxx loc2stap.h tapsets.cxx testsuite/systemtap.examples/index.html testsuite/systemtap.examples/index.txt testsuite/systemtap.examples/keyword-index.html testsuite/systemtap.examples/keyword-index.txt: tmp2 http://tinyurl.com/jh67j52
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