Hi all, I'm trying to run Firefox under gdb on NetBSD 7.0/amd64, but I'm not having much luck.
I found a set of instructions at https://wiki.netbsd.org/tutorials/pkgsrc/debugging_firefox/ but when I follow them, gdb behaves stranegly, like being unable to set a breakpoint in main(), and getting SIGTRAPs seemingly at random: $ /usr/pkgsrc/www/firefox/work/build/dist/bin $ ./run-mozilla.sh -g ./firefox [...] (gdb) break main Breakpoint 1 at 0x11be0: file /usr/pkgsrc/www/firefox/work/firefox-45.0.1/browser/app/nsBrowserApp.cpp, line 287. (gdb) run Starting program: /usr/pkgsrc/www/firefox/work/build/dist/bin/firefox Error in re-setting breakpoint 1: Cannot access memory at address 0x11be0 Error in re-setting breakpoint 1: Cannot access memory at address 0x11be0 Program received signal SIGTRAP, Trace/breakpoint trap. 0x00007f7ff683c3ea in ?? () (gdb) where #0 0x00007f7ff683c3ea in ?? () #1 0x00007f7ff78070f7 in ?? () #2 0x0000000100000246 in ?? () #3 0x00007f7ff7b8c400 in ?? () #4 0x00007f7fdebfec70 in ?? () #5 0x00007f7fee031a32 in ?? () #6 0x00000001ffffffff in ?? () #7 0x00007f7ff7b4a400 in ?? () #8 0x0001000100000012 in ?? () #9 0x0000000000000000 in ?? () And if I try to attach gdb to a running Firefox process, gdb seems to think I'm trying to debug ld.elf_so: (gdb) attach 25976 Attaching to program: /usr/pkg/bin/firefox, process 25976 Reading symbols from /usr/libexec/ld.elf_so...(no debugging symbols found)...done. Loaded symbols for /usr/libexec/ld.elf_so 0x00007f7ff689f65a in .rtld_start () from /usr/libexec/ld.elf_so (gdb) where #0 0x00007f7ff689f65a in .rtld_start () from /usr/libexec/ld.elf_so #1 0x00007f7ff7808f2b in ?? () #2 0x00007f7fc76ffb60 in ?? () #3 0x00007f7fcd847a48 in ?? () #4 0x00007f7fc76ffb40 in ?? () #5 0x00007f7ff1d9a324 in ?? () #6 0x0000000200000000 in ?? () #7 0x00007f7ff5f8b4d8 in ?? () #8 0x00000000c76ffbf0 in ?? () #9 0x00007f7fcbd09360 in ?? () #10 0x00007f7fc76ffba0 in ?? () #11 0x00007f7fcc4bf7a0 in ?? () #12 0x00007f7ffffeb118 in ?? () #13 0x0000000000000000 in ?? () Any hints? -- Andreas Gustafsson, g...@gson.org