Re: [Valgrind-users] Valgrind Internal Error: Valgrind received a signal 11 (SIGSEGV) - exiting

[John R. <jr...@bi...>]

> 3. How much physical RAM? How much swap space? (The string "out_of_memory" appears in the output.)
> 
> JK - [    0.000000] Memory: 495376K/507904K available (5078K kernel code, 420K rwdata, 1704K rodata, 208K init, 328K bss, 12528K reserved, 0K highmem)
> 
> Not sure how to get swap space.

Run /usr/bin/top, which gives other useful statistics about resources, too.
On a 32-bit ARM RaspberryPi model 2 with 1GB RAM the output might begin like this
for an "idle" machine:
=====
Tasks:  84 total,   1 running,  83 sleeping,   0 stopped,   0 zombie
%Cpu(s):  0.1 us,  0.1 sy,  0.0 ni, 99.8 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
MiB Mem :    924.1 total,    582.1 free,     66.0 used,    276.0 buff/cache
MiB Swap:      0.0 total,      0.0 free,      0.0 used.    830.5 avail Mem
=====

> 
> 
> 4. Was valgrind essentially the only process running?
> 
> JK – Definitely not.  The TR069 consists of a whole family of CCSP processes that communicate to each other via DBUS.  The TR069PA was however the only process running via valgrind
> 
> 5. How many threads?
> 
> JK – 4 threads per CCSP process, including the one running valgrind.

So there are many CCSP processes, plus other processes, running on a box with
512 megaBytes of RAM and no swap space.  Remember that a process running valgrind
(memcheck) requires about 2 to 3 times the memory of a non-checked process.

You have exhausted the available RAM.  The "out of memory" string was a clue.

Reduce the number and size of simultaneous CCSP processes.  Reduce the number
and size non-CCSP processes.  Run valgrind (memcheck) only on the one CCSP
process that really interests you.  Do not use --trace-children=yes.  Instead,
make CcspTr069PaSsp into an executable "wrapper" shell script which identifies
the correct instance (perhaps by count of invocations), then runs valgrind
on a saved copy of the original CcspTr069PaSsp; else just runs the
saved copy without valgrind.