Here's the backtrace by running 'XFT_DEBUG=16 emacs -Q -xrm "emacs.synchronous: true':
fish> bash -c 'XFT_DEBUG=16 emacs -Q -xrm "emacs.synchronous: true"'
XFT_DEBUG=16
FontFile /usr/share/fonts/TTF/Hack-Regular.ttf/0 matches new
Loading file /usr/share/fonts/TTF/Hack-Regular.ttf/0
FontFile /usr/share/fonts/TTF/Hack-Italic.ttf/0 matches new
Loading file /usr/share/fonts/TTF/Hack-Italic.ttf/0
FontFile /usr/share/fonts/TTF/Hack-Regular.ttf/0 matches existing (2)
FontFile /usr/share/fonts/TTF/Hack-Bold.ttf/0 matches new
Loading file /usr/share/fonts/TTF/Hack-Bold.ttf/0
FontFile /usr/share/fonts/TTF/DroidSansDevanagari-Regular.ttf/0 matches new
Loading file /usr/share/fonts/TTF/DroidSansDevanagari-Regular.ttf/0
FontFile /usr/share/fonts/TTF/Hack-Regular.ttf/0 matches existing (2)
FontFile /usr/share/fonts/noto/NotoSansBengaliUI-Regular.ttf/0 matches new
Loading file /usr/share/fonts/noto/NotoSansBengaliUI-Regular.ttf/0
Fatal error 11: Segmentation fault
Backtrace:
emacs[0x50f73f]
emacs[0x4f4a72]
emacs[0x50db6f]
emacs[0x50dd99]
emacs[0x50de1a]
/usr/lib/libpthread.so.0(+0x123c0)[0x7fa340bec3c0]
emacs[0x5da6cb]
emacs[0x5de15f]
emacs[0x57dc08]
emacs[0x56cced]
emacs[0x5a8fe1]
emacs[0x56f654]
emacs[0x56cc6b]
emacs[0x56c003]
emacs[0x42c646]
emacs[0x438fac]
emacs[0x5ca81f]
emacs[0x5ce90b]
emacs[0x445195]
emacs[0x443205]
emacs[0x44b028]
emacs[0x44fe7b]
emacs[0x463783]
emacs[0x46668b]
emacs[0x56bec7]
emacs[0x42fe73]
emacs[0x45369d]
emacs[0x4fec31]
emacs[0x502778]
emacs[0x503e94]
emacs[0x56be2f]
emacs[0x4f4e55]
emacs[0x56bd9e]
emacs[0x4f4ded]
emacs[0x4f9fe8]
emacs[0x4fa328]
emacs[0x4157eb]
/usr/lib/libc.so.6(__libc_start_main+0xf3)[0x7fa34052f223]
emacs[0x41658a]
fish: “bash -c 'XFT_DEBUG=16 emacs -Q…” terminated by signal SIGSEGV (Address boundary error)