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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<tonyj> fche:
<tonyj> fche: hi, you around
<fche> round indeed
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<tonyj> lol
<tonyj> so how can I tell if there is useful info at the DW_AT_location
<tonyj> -vvL on the function doesn't report anything about the parameters it can't detect
<fche> that is a sign that stap didn't find the location list satisfactory in some way
<fche> the list may just not cover the PC address in question
<tonyj> understood but is there any way of debugging what "some way" means
<fche> that's one common bit
<fche> hm, wonder if stap -vvvvvv helps this aspect
* tonyj cannot tell if fche is joking
<fche> wel, pass-2 verbosity is where I'd look for more info
<tonyj> ol
<tonyj> saveargs: finding location for local 'filename' (dieoffset: 0x154842a)
<tonyj> saveargs: local 'filename' (dieoffset: 0x154842a) is not available at this address (0xc0000000004a4e88)
<fche> there you go
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<kerneltoast> fche, bonjour
<kerneltoast> php in fedora 32+ has its executable section at a non-zero offset
<fche> hello bread fren
<fche> have a stap test scenario where I can see this in action?
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<kerneltoast> you on fedora 33?
<fche> yes
<kerneltoast> kool
<kerneltoast> you need php-cli installed
<kerneltoast> the stap script should print out zend_std_get_debug_info
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<fche> don't see much weird about /usr/bin/php as compared bin /bin/ls
<kerneltoast> this was just noticed with php
<kerneltoast> i didn't make the reproducer
<kerneltoast> i'm just the bugfix monkey
<fche> aha
<kerneltoast> what happens in _stp_vma_mmap_cb() is that the sections with a non-zero offset are attempted to be extended
<kerneltoast> but that don't work
<kerneltoast> _stp_vma_mmap_cb:230: extended '/usr/bin/php' for 931892 (res:-3) [562a1cb51000-562a1cdb5000]
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<fche> intelesting
<fche> we get the offset value way down in the _mmap_cb but don't save it and use it imperfectly
<fche> would be happier if a comment explained what this offset represents in practice - the offset between what and what
<fche> I wonder if this visibly affects only those programs using usymname() kind of thing
<kerneltoast> i would love to add more comments but i understand very little of this
<kerneltoast> and i too am unsure if anything else is affected
<kerneltoast> this is where the almighty fche steps in
<fche> is it really
<fche> well simple q -- how does the testsuite look before/after your change?
<kerneltoast> guess i should run that
<fche> it looks plausible, but I'd have to trace through in more detail
<kerneltoast> feel free to do so
<kerneltoast> it'd make me feel more comfortable
<fche> yeah will look into it later on tonight
<fche> din din time tho
<kerneltoast> 5pm dinner, u cray
<fche> normal 'round here
<kerneltoast> won't you get hungry at 2am
<kerneltoast> when you're fixing bugs
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