It did shown me
Automatic restarts limited: Please try restarting this job later or contact firstname.lastname@example.org. twice, here is the raw log: https://api.travis-ci.com/v3/job/251553646/log.txt
Basically, I just added lines like these:
# Linux for AArch with GCC - os: linux arch: arm64 env: COMPILER_NAME=gcc CXX=g++ CC=gcc CFLAGS="-DR2_ASSERT_STDOUT=1"
The job in a Web interface here: https://travis-ci.com/radareorg/radare2/jobs/251553646
And the pull request is here: https://github.com/radareorg/radare2/pull/15393