Hi everyone. It looks like the impossible happened. I was attempting to
blindly run valgrind on debian unstable against slic3r-pe (mostly c++,
which itself uses wxWidgets 3.1), both freshly compiled using gcc 8.3
and got the following:

$ valgrind ./src/slic3r-gui
==19253== Memcheck, a memory error detector
==19253== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==19253== Using Valgrind-3.14.0 and LibVEX; rerun with -h for copyright info
==19253== Command: ./src/slic3r-gui
==19253==
VEX temporary storage exhausted.
Pool = TEMP,  start 0x59640548 curr 0x59b04c90 end 0x59b05087 (size 5000000)

vex: the `impossible' happened:
   VEX temporary storage exhausted.
Increase N_{TEMPORARY,PERMANENT}_BYTES and recompile.
vex storage: T total 5219676632 bytes allocated
vex storage: P total 512 bytes allocated

valgrind: the 'impossible' happened:
   LibVEX called failure_exit().

host stacktrace:
==19253==    at 0x580480A4: ??? (in 
/usr/lib/x86_64-linux-gnu/valgrind/memcheck-amd64-linux)
==19253==    by 0x580481B7: ??? (in 
/usr/lib/x86_64-linux-gnu/valgrind/memcheck-amd64-linux)
==19253==    by 0x5804840B: ??? (in 
/usr/lib/x86_64-linux-gnu/valgrind/memcheck-amd64-linux)
==19253==    by 0x5804842A: ??? (in 
/usr/lib/x86_64-linux-gnu/valgrind/memcheck-amd64-linux)
==19253==    by 0x5805EEB4: ??? (in 
/usr/lib/x86_64-linux-gnu/valgrind/memcheck-amd64-linux)
==19253==    by 0x5814153A: ??? (in 
/usr/lib/x86_64-linux-gnu/valgrind/memcheck-amd64-linux)
==19253==    by 0x581415BD: ??? (in 
/usr/lib/x86_64-linux-gnu/valgrind/memcheck-amd64-linux)
==19253==    by 0x581E405C: ??? (in 
/usr/lib/x86_64-linux-gnu/valgrind/memcheck-amd64-linux)
==19253==    by 0x581CE277: ??? (in 
/usr/lib/x86_64-linux-gnu/valgrind/memcheck-amd64-linux)
==19253==    by 0x581CF618: ??? (in 
/usr/lib/x86_64-linux-gnu/valgrind/memcheck-amd64-linux)
==19253==    by 0x5813EB58: ??? (in 
/usr/lib/x86_64-linux-gnu/valgrind/memcheck-amd64-linux)
==19253==    by 0x58061976: ??? (in 
/usr/lib/x86_64-linux-gnu/valgrind/memcheck-amd64-linux)
==19253==    by 0x580A524B: ??? (in 
/usr/lib/x86_64-linux-gnu/valgrind/memcheck-amd64-linux)
==19253==    by 0x580A71EF: ??? (in 
/usr/lib/x86_64-linux-gnu/valgrind/memcheck-amd64-linux)
==19253==    by 0x580F5D80: ??? (in 
/usr/lib/x86_64-linux-gnu/valgrind/memcheck-amd64-linux)

sched status:
  running_tid=1

Thread 1: status = VgTs_Runnable (lwpid 19253)
==19253==    at 0x541A124: (anonymous 
namespace)::wxPNGImageData::DoLoadPNGFile(wxImage*, 
(ab/libwx_gtk3u_core-3.1.so.2.0.0)
...
...

Is that the kind of impossible that I should fix by increasing the
buffer, or it's the kind of impossible you want to know more about? ;)



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