#systemtap on 2020-06-13 — irc logs at freenode.irclog.whitequark.org

2015-11-12 23:18 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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21:55 <agentzh> fche: i've noted a memory leak in runtime/vma.c.

21:56 <agentzh> the patch seems to fix the most obvious one: https://gist.github.com/agentzh/96b9c2c1d8fded2bd0f940cf331d757e

21:56 <agentzh> is it good to merge?

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21:57 <agentzh> stap's DEBUG_MEM reports a lot of "SYSTEMTAP ERROR: Memory ffff8cbb75523820 len=112 allocation type: kmalloc. Not freed." for even the simplest stap script using vma tracker.

21:58 <agentzh> with this patch, it reports nothing for simple scripts and some complex ones.

21:59 <agentzh> this bug seems to date back to 2011.

21:59 <agentzh> CONFIG_UTRACE is the old red hat utrace kernel patch, iirc.

22:12 <agentzh> we saw this leak accumlated several giga bytes of Slab size which cannot be released until reboot the system.

22:25 <agentzh> fche: also, i think this patch is also needed to avoid any leaks after we have commit 04d221c16b: https://gist.github.com/agentzh/24b1e2370f5bf7a4415105dc6bd16f0e

22:26 <agentzh> since commit 04d221c16b, we also run task finder callbacks when it is in STAP_SESSION_STARTING.

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