Date: Sat, 17 May 2008 11:17:40 +0200 From: Jeremie Le Hen <jeremie@le-hen.org> To: freebsd-hackers@FreeBSD.org Subject: Debugging rtld Message-ID: <20080517091740.GI70896@obiwan.tataz.chchile.org>
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Hi there, I tried to compile my source tree with -fstack-protector-all, and it happens that rtld breaks with this: once the new rtld is installed every single problem coredumps. I tried to compile rtld-elf without SSP, but it didn't solve the problem. Then I had to compile libc_pic.a without SSP and it worked, but I don't understand the root of the problem. So I want to use the generated coredump for post-mortem analysis with gdb. I compiled world with DEBUG_FLAGS=-g. But GDB gives me a backtrace so long that it can't be real. Moreoever it doesn't seem to bring in the required symbols. I'm a GDB novice, so I'd like some help. chroot> ===> libexec/rtld-elf (install) chroot> chflags noschg /usr/libexec/ld-elf.so.1 chroot> install -s -o root -g wheel -m 555 -C -b -fschg -S ld-elf.so.1 /libexec chroot> install -o root -g wheel -m 444 rtld.1.gz /usr/share/man/man1 chroot> *** Signal 11 chroot> chroot> jarjarbinks# cd /root; ls chroot> Segmentation fault host> jarjarbinks:145# ls -l /space/chroot/root/ls.core host> -rw------- 1 root wheel 184320 May 17 10:19 /space/chroot/root/ls.core host> jarjarbinks:149# gdb -c /space/chroot/root/ls.core -e /space/chroot/bin/ls host> GNU gdb 6.1.1 [FreeBSD] host> [...] host> This GDB was configured as "i386-marcel-freebsd". host> Core was generated by `ls'. host> Program terminated with signal 11, Segmentation fault. host> #0 0x280583e4 in ?? () host> (gdb) bt host> #0 0x280583e4 in ?? () host> #1 0x00000000 in ?? () host> #2 0x00000000 in ?? () host> #3 0x00000000 in ?? () host> #4 0x00000000 in ?? () host> #5 0x00000000 in ?? () host> #6 0x00000000 in ?? () host> #7 0x00000000 in ?? () host> #8 0x00000000 in ?? () host> #9 0x00000000 in ?? () host> #10 0x00000000 in ?? () host> #11 0xffffffff in ?? () host> #12 0x00001000 in ?? () host> [...] host> #359 0x73763a68 in ?? () host> #360 0x5b455c3d in ?? () host> [...] host> #855 0x00000000 in ?? () host> [...] Any hint on how to proceed would be welcome. Thank you. Regards, -- Jeremie Le Hen < jeremie at le-hen dot org >< ttz at chchile dot org >
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