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vi/gist:808077

Created February 2, 2011 17:55
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vi@vi-notebook:~/_$ git clone -b valgrind-failure git://github.com/vi/tcplim.git
Cloning into tcplim...
...
vi@vi-notebook:~/_$ cd tcplim/
vi@vi-notebook:~/_/tcplim$ make
gcc -O2 tcplim.c -o tcplim
vi@vi-notebook:~/_/tcplim$ socat tcp-l:9998,reuseaddr,fork file:/dev/zero&
[1] 11525
vi@vi-notebook:~/_/tcplim$ valgrind ./tcplim 127.0.0.1 9999 127.0.0.1 9998 10000000 10000000 1000000000 1000000000 50 2> log&
[2] 11550
vi@vi-notebook:~/_/tcplim$ nc 127.0.0.1 9999 | pv > /dev/null
48kB 0:00:00 [1.01MB/s] [ <=> ]
vi@vi-notebook:~/_/tcplim$ grep impossible log
Memcheck: the 'impossible' happened:
[1]+ Stopped socat tcp-l:9998,reuseaddr,fork file:/dev/zero
[2]- Exit 1 valgrind ./tcplim 127.0.0.1 9999 127.0.0.1 9998 10000000 10000000 1000000000 1000000000 50 2> log
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vi commented Feb 2, 2011

Considering "impossible happened" like "internal compiler error" - the bug present not matter whether the code being checked is valid or invalid.

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