Crashes when releasing a persistent license

[nakamura-work]

Overview

Releasing a persistent license causes a crash due to an assertion inside the widevine cdm plugin.

Build environment

• macOS Big Sur (11.5.1)
• shaka-player-embedded/master
  • Xcode 11.7
  • commit 180462a1bb6ea0642f0681486cb41448c167b54f
• shaka-player-embedded/master/sample_xcode_project
  • Xcode 13.2.1
  • commit 180462a1bb6ea0642f0681486cb41448c167b54f with patches
• Widevine CDM 15.2.4
  • commit/df86ca975b8c03da33771736fa81078b22d0507b

Execution environment

iPhone 13 mini (iOS 15.5)

Steps to reproduce

1. build "ShakaPlayerEmbedded"
2. place both of .framework on //sample_xcode_project
3. add widevine_cdm_secured_ios.framework to project
4. apply the attached patches
5. run the app
6. long press "shaka-proxy / angel-one" and select "Download"
7. wait for download completion
8. long press "shaka-proxy / angel-one" and select "Remove"

As a result, the app crashes with a failed assertion as follows:

Assertion failed: (got_server_certificate_), function Update, file /<cdm_dir>/shaka_plugin/widevine_implementation.cc, line 357.

Supplements

• Explicitly specifying 'serverCertificate' before instantiating Storage (via Player) escapes the crash.
• I commented out the assertion as a test, and then the deletion process completed.

crash-on-remove-license.txt