(dbx) where
>  0 memcpy(0x7ffd79b4, 0x0, 0x1, 0x7ffd6e54, 0x108184, 0x0, 0x7ffd79b5, 0x0) ["/xlv86/patches/7204/work/irix/lib/libc/libc_n32_M4/strings/bcopy.s":357, 0xfa5065c]
   1 _dowrite(0x0, 0x1, 0x7ffd7990, 0x7ffd6e54, 0x108184, 0x0, 0x7ffd79b5, 0x0) ["/xlv86/patches/7204/work/irix/lib/libc/libc_n32_M4/print/doprnt.c":215, 0xfa66edc]
   2 _doprnt(0x10090d60, 0x8000, 0x7ffd7990, 0x7ffd6e54, 0x108184, 0x0, 0x7ffd79b5, 0x0) ["/xlv86/patches/7204/work/irix/lib/libc/libc_n32_M4/print/doprnt.c":1734, 0xfa56dc0]
   3 _vsnprintf(0x7ffd79b4, 0x0, 0x1, 0x7ffd6e54, 0x108184, 0x0, 0x7ffd79b5, 0x0) ["/xlv86/patches/7204/work/irix/lib/libc/libc_n32_M4/print/vsnprintf.c":36, 0xfb0f870]
   4 vasprintf(ret = 0x100af710, format = 0x10090d60 = "%zun", ap = 0x7ffd7a30 = "") ["/root/mandoc-1.14.5/compat_vasprintf.c":44, 0x10066e40]
   5 mandoc_asprintf(dest = 0x100af710, fmt = 0x10090d60 = "%zun", ... = <void>) ["/root/mandoc-1.14.5/mandoc_aux.c":41, 0x10066a80]
   6 rewrite_macro2len(mdoc = 0x100932e8, arg = 0x100af710) ["/root/mandoc-1.14.5/mdoc_validate.c":1651, 0x1006bcac]
   7 post_bl_norm(mdoc = 0x100932e8) ["/root/mandoc-1.14.5/mdoc_validate.c":703, 0x100688e4]
   8 post_bl_head(mdoc = 0x100932e8) ["/root/mandoc-1.14.5/mdoc_validate.c":1661, 0x1006bce8]
   9 post_bl(mdoc = 0x100932e8) ["/root/mandoc-1.14.5/mdoc_validate.c":1732, 0x1006c080]
   10 mdoc_validate(mdoc = 0x100932e8) ["/root/mandoc-1.14.5/mdoc_validate.c":378, 0x10067474]
   11 mdoc_validate(mdoc = 0x100932e8) ["/root/mandoc-1.14.5/mdoc_validate.c":322, 0x100670d8]
   12 mdoc_validate(mdoc = 0x100932e8) ["/root/mandoc-1.14.5/mdoc_validate.c":322, 0x100670d8]
   13 mdoc_validate(mdoc = 0x100932e8) ["/root/mandoc-1.14.5/mdoc_validate.c":322, 0x100670d8]
   14 mdoc_validate(mdoc = 0x100932e8) ["/root/mandoc-1.14.5/mdoc_validate.c":322, 0x100670d8]
   15 mparse_result(curp = 0x10093218) ["/root/mandoc-1.14.5/read.c":696, 0x10049e08]
   16 mpages_merge(dba = 0x100a11d0, mp = 0x10093218) ["/root/mandoc-1.14.5/mandocdb.c":1147, 0x10030fe0]
   17 mandocdb(argc = 0, argv = 0x7ffd7f58) ["/root/mandoc-1.14.5/mandocdb.c":510, 0x1002f48c]
   18 main(argc = 1, argv = 0x7ffd7f54) ["/root/mandoc-1.14.5/main.c":154, 0x1003516c]
   19 __start() ["/xlv55/kudzu-apr12/work/irix/lib/libc/libc_n32_M4/csu/crt1text.s":177, 0x10005dc8]