Obtained 23 stack frames.
/usr/games/crawl-git-e618eeaa78(_Z17write_stack_traceP8_IO_FILE+0x3f) [0x556d47b9514f]: write_stack_trace(_IO_FILE*)
/usr/games/crawl-git-e618eeaa78(_Z20crash_signal_handleri+0x18f) [0x556d47b9556f]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x46210) [0x7fc6d4eb2210]: 
/lib/x86_64-linux-gnu/libpthread.so.0(raise+0xcb) [0x7fc6d507324b]: 
/usr/games/crawl-git-e618eeaa78(+0x452aad) [0x556d47b9eaad]: 
/usr/games/crawl-git-e618eeaa78(+0x452f49) [0x556d47b9ef49]: 
/usr/games/crawl-git-e618eeaa78(_Z20crash_signal_handleri+0x291) [0x556d47b95671]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x46210) [0x7fc6d4eb2210]: 
/usr/games/crawl-git-e618eeaa78(_ZNK6player23get_base_mutation_levelE13mutation_typebbb+0) [0x556d47f7fcd0]: player::get_base_mutation_level(mutation_type, bool, bool, bool) const
/usr/games/crawl-git-e618eeaa78(_ZNK6player12has_mutationE13mutation_typeb+0x10) [0x556d47f82ee0]: player::has_mutation(mutation_type, bool) const
/usr/games/crawl-git-e618eeaa78(_Z21get_crosstrain_skills10skill_type+0x37) [0x556d48071937]: get_crosstrain_skills(skill_type)
/usr/games/crawl-git-e618eeaa78(_Z21get_crosstrain_points10skill_type+0x24) [0x556d48071a84]: get_crosstrain_points(skill_type)
/usr/games/crawl-git-e618eeaa78(_ZNK6player5skillE10skill_typeibb+0xb2) [0x556d47fe4412]: player::skill(skill_type, int, bool, bool) const
/usr/games/crawl-git-e618eeaa78(_Z10target_met10skill_type+0x2c) [0x556d480755bc]: target_met(skill_type)
/usr/games/crawl-git-e618eeaa78(_Z21check_training_target10skill_type+0x5b) [0x556d4807562b]: check_training_target(skill_type)
/usr/games/crawl-git-e618eeaa78(_Z22check_training_targetsv+0x1a) [0x556d4807577a]: check_training_targets()
/usr/games/crawl-git-e618eeaa78(_Z12train_skillsb+0x2fe) [0x556d48076afe]: train_skills(bool)
/usr/games/crawl-git-e618eeaa78(_Z9apply_expv+0x2e4) [0x556d47ffcff4]: apply_exp()
/usr/games/crawl-git-e618eeaa78(+0xacc1ee) [0x556d482181ee]: 
/usr/games/crawl-git-e618eeaa78(+0xacd52d) [0x556d4821952d]: 
/usr/games/crawl-git-e618eeaa78(main+0x1a8) [0x556d47aeaac8]: 
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf3) [0x7fc6d4e930b3]: 
/usr/games/crawl-git-e618eeaa78(_start+0x2e) [0x556d47aeb63e]: