Segmentation fault on shaka::Period::GetAdaptationSets()

[murillo128]

System info

Ubunto 22.04
Shaka Packager Version: d5ca6e8

Issue and steps to reproduce the problem

This happened on a production server, not sure what have been the exact conditions for reproducing the problem.

This is the back trace of the segmentation fault:

Thread 1 (Thread 0x7fb207d7f7c0 (LWP 1825)):
#0  0x00007fb1ee344894 in shaka::Period::GetAdaptationSets[abi:cxx11]() const () from /opt/millicast/bin/medooze/node_modules/medooze-shaka-packager/build/Release/medooze-shaka-packager.node
#1  0x00007fb1ee1d4e36 in shaka::MpdBuilder::GetEarliestTimestamp(double*) () from /opt/millicast/bin/medooze/node_modules/medooze-shaka-packager/build/Release/medooze-shaka-packager.node
#2  0x00007fb1ee1d60ad in shaka::MpdBuilder::AddDynamicMpdInfo(shaka::xml::XmlNode*) () from /opt/millicast/bin/medooze/node_modules/medooze-shaka-packager/build/Release/medooze-shaka-packager.node
#3  0x00007fb1ee1d7145 in shaka::MpdBuilder::GenerateMpd() () from /opt/millicast/bin/medooze/node_modules/medooze-shaka-packager/build/Release/medooze-shaka-packager.node
#4  0x00007fb1ee1d7466 in shaka::MpdBuilder::ToString(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*) () from /opt/millicast/bin/medooze/node_modules/medooze-shaka-packager/build/Release/medooze-shaka-packager.node
#5  0x00007fb1ee1d455e in shaka::WriteMpdToFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, shaka::MpdBuilder*) () from /opt/millicast/bin/medooze/node_modules/medooze-shaka-packager/build/Release/medooze-shaka-packager.node
#6  0x00007fb1ee1cb00d in shaka::SimpleMpdNotifier::Flush() () from /opt/millicast/bin/medooze/node_modules/medooze-shaka-packager/build/Release/medooze-shaka-packager.node

shaka-packager/packager/mpd/base/mpd_builder.cc

Line 351 in 576889e

for (const auto* adaptation_set : periods_.front()->GetAdaptationSets()) {

Somehow the periods are empty, causing the crash. There is a DCHECK in place, but that doesn't prevent the code from crashing.

[joeyparrish]

It would be best to figure out why periods are empty. This may be an issue with the calls you make into the library. Are you using Packager as a library or via the command-line frontend?