From owner-freebsd-hackers  Thu Aug 26 13:22:16 1999
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From: Amit Singh <amitsingh@research.bell-labs.com>
Message-Id: <199908262018.QAA08160@aura.research.bell-labs.com>
Subject: Examining kernel core dump: gd_curpcb
To: hackers@FreeBSD.ORG
Date: Thu, 26 Aug 1999 16:18:33 -0400 (EDT)
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  The kernel (a hacked 3.2-RELEASE) dumps core (courtesy a panic),
  and upon a subsequent boot, the following happens:

  # cd /usr/src/sys/compile/FOOKERNEL
  # gdb -k
  GNU gdb 4.18
  ...
  (kgdb) symbol-file kernel.debug
  Reading symbols from kernel.debug...done.
  (kgdb) exec-file /var/crash/kernel.0
  (kgdb) core-file /var/crash/vmcore.0
  IdlePTD 4294967295
  kernel symbol `gd_curpcb' not found.

  gd_curpcb is (apparently) not referenced in either of the kernel,
  kernel.debug or vmcore files. It is however referenced in
  /usr/libexec/elf/gdb though.

  Next, a "grep gd_curpcb **/*" in the GNU source for gdb-4.18
  yields no match. The file src/gnu/usr.bin/binutils/i386/kvm-fbsd.c
  does contain the following:

  curpcb = kvtophys(cfd, ksym_lookup ("gd_curpcb") + prv_start);

  The question is: where is this symbol defined so that gdb can
  look it up successfully?

  Regards
  Amit Singh


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