#armlinux on 2022-05-16 — irc logs at libera.irclog.whitequark.org

2021-05-27 16:22 ChanServ changed the topic of #armlinux to: ARM kernel talk [Upstream kernel, find your vendor forums for questions about their kernels] | https://libera.irclog.whitequark.org/armlinux

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19:40 <Xogium> probably a bit OT but, has anyone ever ran into difficulties using uprobes and ftrace to track a process ?

19:41 <Xogium> if I run this in the /sys/kernel/tracing directory, the first 2 commands execute without a problem. If I run the third command however, it kills my ssh access.. Go figure why that is

19:42 <Xogium> echo "r:uprobes/malloc_ret /usr/lib/libc.so.6:0x00085dc8 ret=\$retval" > uprobe_events

19:42 <Xogium> echo "common_pid == $(pidof irssi)" > events/uprobes/filter

19:42 <Xogium> echo 1 > events/uprobes/enable

19:42 <Xogium> that explodes my ssh access

19:53 <Xogium> trying to find a bloody memory leak and ftrace was kinda my last resort

20:03 <ukleinek> Xogium: in irssi?

20:04 * ukleinek would expect strace or valgrind to be more useful debug tools for that

20:06 <Xogium> mmh strace can't really track malloc, can it ?

20:07 <Xogium> as for valgrind, I don't think it could run effectively with a machine like this

20:07 <Xogium> but who knows ? It only has 512 MB of ram and a 650 mhz cpu

20:08 <Xogium> and yeah, the damned leak is in irssi and so subtle. It leaks about 3 MB per week

20:09 <Xogium> but its randomly doing it, and has been driving me up the wall

20:10 <Xogium> I even tried dmalloc but that didn't actually work, as I couldn't manage to link irssi against it in the first place

20:11 <Xogium> still.. why would setting uprobes on irssi.. kill my ssh that didn't ask for any trouble ? :p

20:11 * ukleinek checks if libc malloc has some debugging builtin

20:13 * ukleinek would try attaching gdb to irssi, register a break at malloc() and let it log the backtrace and continue immediately

20:13 <Xogium> hmm

20:14 <Xogium> could be an idea

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20:14 * ukleinek doesn't know how to do that offhand, but he thinks that should be possible

20:16 <Xogium> what about tracking all those free() ?

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21:16 <bencoh> ukleinek: to remain offtopic, I'd check plugins/scripts first when it comes to irssi leaks

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21:19 <Xogium> bencoh: already tried :/ I disabled even the loading of otr and perl modules, and hence of any script

21:19 <bencoh> ah, well ...

21:19 <Xogium> I've been trying to track this down for a few weeks, maybe a month and not having much success :D

21:19 <Xogium> and for some reason gdb doesn't seem to even break on malloc

21:20 <bencoh> maybe they use a different allocator

21:20 <Xogium> that's possible

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21:22 <Xogium> I'm still unsure what happened earlier and why ssh was killed. Maybe it doesn't like when you toy about in libc with ftrace

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22:38 <marex> Xogium: did you look at lsan ?

22:38 <marex> Xogium: https://github.com/google/sanitizers/wiki/AddressSanitizerLeakSanitizer leek sanitizer

22:39 <marex> Xogium: MALLOC_CHECK_ (man 3 mallopt) might be useful too

22:39 <marex> Xogium: and pmap(1)

22:43 <Xogium> marex: I wasn,t aware of all of these

22:43 <Xogium> thanks for pointing out to them :)

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