Hello, I was able to do a build of texlive-amscls with `export MALLOC_CHECK_=2`, and a core dump was generated. I managed to get a guix environment with debuginfo for texlive-bin, but for some reason it still doesn’t have debug info for glibc available. FYI, this was the command line I used: $ guix environment texlive-amscls --with-debug-info=texlive-bin \ --ad-hoc valgrind gdb glibc:debug Valgrind isn’t working because of the lack of glibc debug info, but I was able to get the backtrace below from the core file, using GDB. I am yet to analyse it and see if it provides any clue: Core was generated by `luatex amsclass.ins'. Program terminated with signal SIGABRT, Aborted. #0 0x00007f50ad3d5a7a in raise () from /gnu/store/vp1q2ymbfzr52zxqs5z3r3nd0yprbg7h-glibc-2.33/lib/libc.so.6 (gdb) backtrace #0 0x00007f50ad3d5a7a in raise () from /gnu/store/vp1q2ymbfzr52zxqs5z3r3nd0yprbg7h-glibc-2.33/lib/libc.so.6 #1 0x00007f50ad3c0523 in abort () from /gnu/store/vp1q2ymbfzr52zxqs5z3r3nd0yprbg7h-glibc-2.33/lib/libc.so.6 #2 0x00007f50ad415d28 in ?? () from /gnu/store/vp1q2ymbfzr52zxqs5z3r3nd0yprbg7h-glibc-2.33/lib/libc.so.6 #3 0x00007f50ad41d54a in ?? () from /gnu/store/vp1q2ymbfzr52zxqs5z3r3nd0yprbg7h-glibc-2.33/lib/libc.so.6 #4 0x00007f50ad421bd7 in ?? () from /gnu/store/vp1q2ymbfzr52zxqs5z3r3nd0yprbg7h-glibc-2.33/lib/libc.so.6 #5 0x0000000000486c7e in my_luaalloc (ud=, ptr=, osize=1104, nsize=) at ../../../texlive-20190410-source/texk/web2c/luatexdir/lua/luastuff.c:115 #6 0x00007f50ad754b81 in luaM_realloc_ (L=L@entry=0x12212a8, block=block@entry=0x1316cc0, osize=osize@entry=1104, nsize=nsize@entry=2208) at ../../../texlive-20190410-source/libs/lua53/lua53-src/src/lmem.c:86 #7 0x00007f50ad74d8b3 in luaD_reallocstack (L=0x12212a8, newsize=138) at ../../../texlive-20190410-source/libs/lua53/lua53-src/src/ldo.c:182 #8 0x00007f50ad74e121 in luaD_precall (L=L@entry=0x12212a8, func=, nresults=0) at ../../../texlive-20190410-source/libs/lua53/lua53-src/src/ldo.c:424 #9 0x00007f50ad74e393 in luaD_precall (nresults=, func=, L=0x12212a8) at ../../../texlive-20190410-source/libs/lua53/lua53-src/src/ldo.c:413 #10 luaD_call (L=L@entry=0x12212a8, func=, nResults=) at ../../../texlive-20190410-source/libs/lua53/lua53-src/src/ldo.c:498 #11 0x00007f50ad74e3f1 in luaD_callnoyield (L=0x12212a8, func=, nResults=) at ../../../texlive-20190410-source/libs/lua53/lua53-src/src/ldo.c:509 #12 0x00007f50ad74d83f in luaD_rawrunprotected (L=L@entry=0x12212a8, f=f@entry=0x7f50ad74f6d0 , ud=ud@entry=0x0) at ../../../texlive-20190410-source/libs/lua53/lua53-src/src/ldo.c:142 #13 0x00007f50ad74e6fb in luaD_pcall (L=L@entry=0x12212a8, func=func@entry=0x7f50ad74f6d0 , u=u@entry=0x0, old_top=1200, ef=ef@entry=0) at ../../../texlive-20190410-source/libs/lua53/lua53-src/src/ldo.c:729 #14 0x00007f50ad74f5dd in GCTM (L=L@entry=0x12212a8, propagateerrors=propagateerrors@entry=0) at ../../../texlive-20190410-source/libs/lua53/lua53-src/src/lgc.c:823 #15 0x00007f50ad750eca in callallpendingfinalizers (L=) --Type for more, q to quit, c to continue without paging-- at ../../../texlive-20190410-source/libs/lua53/lua53-src/src/lgc.c:862 #16 luaC_freeallobjects (L=L@entry=0x12212a8) at ../../../texlive-20190410-source/libs/lua53/lua53-src/src/lgc.c:971 #17 0x00007f50ad75a93e in close_state (L=0x12212a8) at ../../../texlive-20190410-source/libs/lua53/lua53-src/src/lstate.c:245 #18 0x00007f50ad75ae20 in lua_close (L=) at ../../../texlive-20190410-source/libs/lua53/lua53-src/src/lstate.c:344 #19 0x00000000004999a6 in do_final_end () at ../../../texlive-20190410-source/texk/web2c/luatexdir/tex/errors.c:257 #20 0x000000000044ea9e in main (ac=, av=) at ../../../texlive-20190410-source/texk/web2c/luatexdir/luatex.c:609 (gdb) -- Thanks, Thiago