Obtained 24 stack frames.
/usr/games/crawl-js_fixup_vaults(_Z17write_stack_traceP8_IO_FILEi+0x2d) [0xa54c18]: write_stack_trace(_IO_FILE*, int)
/usr/games/crawl-js_fixup_vaults(_Z20crash_signal_handleri+0x23a) [0xa549db]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x364c0) [0x7fa3d727e4c0]: 
/usr/games/crawl-js_fixup_vaults(_ZNKSt10unique_ptrI15vault_placementSt14default_deleteIS0_EE3getEv+0x18) [0x99c6a2]: std::unique_ptr<vault_placement, std::default_delete<vault_placement> >::get() const
/usr/games/crawl-js_fixup_vaults(_ZNKSt10unique_ptrI15vault_placementSt14default_deleteIS0_EEptEv+0x18) [0xa64062]: std::unique_ptr<vault_placement, std::default_delete<vault_placement> >::operator->() const
/usr/games/crawl-js_fixup_vaults(_Z23raw_feature_descriptionRK9coord_def+0x5f) [0xb1e796]: raw_feature_description(coord_def const&)
/usr/games/crawl-js_fixup_vaults() [0xa5d5dd]
/usr/games/crawl-js_fixup_vaults(_Z13do_crash_dumpv+0x5a9) [0xa5fa46]: do_crash_dump()
/usr/games/crawl-js_fixup_vaults(_Z20crash_signal_handleri+0x2c1) [0xa54a62]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x364c0) [0x7fa3d727e4c0]: 
/lib/x86_64-linux-gnu/libpthread.so.0(raise+0x2b) [0x7fa3d7614b7b]: 
/usr/games/crawl-js_fixup_vaults() [0xa5fe30]
/usr/games/crawl-js_fixup_vaults(_Z12AssertFailedPKcS0_iS0_z+0x1f4) [0xa60029]: AssertFailed(char const*, char const*, int, char const*, ...)
/usr/games/crawl-js_fixup_vaults() [0x10abaa6]
/usr/games/crawl-js_fixup_vaults(_Z8tag_readR6reader8tag_type+0x102) [0x10a4918]: tag_read(reader&, tag_type)
/usr/games/crawl-js_fixup_vaults() [0xb9dcf0]
/usr/games/crawl-js_fixup_vaults() [0xb9c4c4]
/usr/games/crawl-js_fixup_vaults(_Z12restore_gameRKSs+0x19) [0xb9d07c]: restore_game(std::string const&)
/usr/games/crawl-js_fixup_vaults(_Z12startup_stepv+0x19c) [0x10764d6]: startup_step()
/usr/games/crawl-js_fixup_vaults() [0xd63d94]
/usr/games/crawl-js_fixup_vaults() [0xd63c5d]
/usr/games/crawl-js_fixup_vaults(main+0x172) [0xd63a87]: 
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xed) [0x7fa3d726976d]: 
/usr/games/crawl-js_fixup_vaults() [0x972469]