Date: Thu, 26 Aug 1999 16:18:33 -0400 (EDT) From: Amit Singh <amitsingh@research.bell-labs.com> To: hackers@FreeBSD.ORG Subject: Examining kernel core dump: gd_curpcb Message-ID: <199908262018.QAA08160@aura.research.bell-labs.com>
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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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