Assertion 'count_tnt(tnt_cache_state) == 0' failed

[mudongliang]

Processor: Intel(R) Core(TM) i7-6700HQ CPU @ 2.60GHz.

Fuzzing Cmd : python bin/ptfuzzer.py "-i test_xmllint/xmllint_in -o test_xmllint/xmllint_out" "test_progs/libxml2/xmllint -o /tmp/null @@", python bin/ptfuzzer.py "-i test_libpng/libpng_in -o test_libpng/libpng_out" test_progs/libpng-1.6.31/readpng, and python bin/ptfuzzer.py "-i test_jpeg/jpeg_in/ -o test_jpeg/jpeg_out/" "test_progs/jpeg-9b/djpeg -gif"

Kernel: Linux Precision-3510 4.10.0-28-generic #32~16.04.2-Ubuntu SMP Thu Jul 20 10:19:48 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

When fuzzing about 30min, all three programs reported one assertion in the following screenshot:

[zhanggenex]

Several people reported the same problem.
This is possibly due to unpredicted behavior of PT packet.
Disable this assertion could help.
The technical detail of this problem is to be discussed.

[mudongliang]

I found this assertion only occurs when several programs are fuzzed concurrently. When I only fuzz one program, it could successfully run without assertion for more than five hours.

[zhanggenex]

Thanks for this information
We will look into this problem if we have enough manpower resource later

[vanhauser-thc]

why is the issue closed when it is still unclear?

its better to leave it open even if there is currently no one to look at it.
Also add a "help wanted" label.

I would have assumed it is only possible to trace one process with intelpt not several in parallel. good to know it seems to be possible