Hi, On Sat, May 17, 2008 at 01:26:53PM +0300, Kostik Belousov wrote: > On Sat, May 17, 2008 at 11:17:40AM +0200, Jeremie Le Hen wrote: > > 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. > > I usually add the CFLAGS+=-g to the rtld-elf/Makefile. Also, you do not > need to bring down the whole host by the broken ld.so.1. Do not install > it at all, and specify the path to the rtld by the --dynamic-linker switch, > see into ld.
Thank you for this tip. However the backtrace is still unusable. I've recompiled libc_pic.a with -g, then rtld-elf with -g and finally /bin/ls with you tip and -g. I'm really brought to a standstill here. Thank you. Best regards, -- Jeremie Le Hen < jeremie at le-hen dot org >< ttz at chchile dot org > _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
