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Old 11-20-2009, 06:48 PM
Dave Anderson
Default crash version 4.1.1 is available

- Fix for a potential session initialization failure when running
against 2.6.30 or later x86_64 kernel dumpfiles whose pages have been
filtered by the the makedumpfile facility. Without the patch, the
session may fail with the error message "crash: page excluded: kernel
virtual address: <address> type: cpu number (per_cpu)", but will
initialize OK if the "--zero_excluded" command line option is used.

- Added "lsmod" as a built-in alias for the "mod" command.

- Added a defensive mechanism to handle corrupt Elf32_Nhdr/Elf64_Nhdr
structures in an ELF vmcore. The fix no longer presumes that all
Elf32_Nhdr/Elf64_Nhdr structure contents are legitimate, and if an
invalid Elf32_Nhdr or Elf64_Nhdr structure is encountered, it will
be ignored and a warning message will be displayed showing the
structure contents, and the crash session will continue on. Without
the patch, it was possible that an invalid n_namesz or n_descsz
value could cause a segmentation violation when attempting to read
the bogus note contents.

- Fix for "mach -c" command option on 2.6.30 and later x86_64 kernels
in which the per-cpu array x8664_pda data structures were replaced
with per-cpu variables. Without the patch, the command displays
just the boot cpu's cpuinfo data structure and then fails with the
error message: "mach: invalid structure name: x8664_pda".

- Fix to properly set the DEBUG exception stack size and stack base
address on 2.6.18 and later x86_64 kernels. Without the patch, the
DEBUG exception stack was presumed to be the same size as all of the
other exception stacks, so in the extremely rare occurrance that a
kernel crash started while running on a per-cpu DEBUG stack, the
backtrace code would not recognize it as such, and would either start
the trace using stale starting stack hooks, typically from "schedule"
while running on the process stack, or the backtrace attempt would
fail with the error message "bt: cannot transition from exception
stack to current process stack".

- Related to the above, when the x86_64 "bt" is displaying a trace
segment from one of the five exception stacks, change the output from
showing just "--- <exception stack> ..." to showing which exception
stack it's working from, for example, "--- <NMI exception stack> ---"
or "--- <DEBUG exception stack> ---", etc.

- Fix for a session initialization failure when running against 2.6.30
or later x86_64 kernels if the number of possible cpus equals the
kernel's configured NR_CPUS. Without the patch, the session fails
with the error message "crash: invalid kernel virtual address: cc08
type: cpu number (per_cpu)".

- Preparations in the top-level source code for the integration of
gbd-7.0. The current embedded version remains gdb-6.1.

Download from: http://people.redhat.com/anderson

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