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Old 01-06-2010, 08:08 PM
Dave Anderson
Default crash version 5.0.0 is available


- Updated embedded gdb version to FSF gdb-7.0.

- Fix for the ppc64 "irq" command where the "irq_desc_t" is no longer
recognized as a typedef for "struct irq_desc". Without the patch,
the command fails with the error message: "irq: invalid structure
size: irqdesc".

- Fix for 2.6.26 and later ppc64 CONFIG_SPARSEMEM_VMEMMAP kernels to
recognize VMEMMAP_REGION virtual addresses. The kernel's memmap page
structure array(s) are mapped in that region, and without the fix,
the vmemmap virtual addresses were being erroneously translated using
the kernel's page tables that map the VMALLOC_REGION. This in turn
led to bogus data being read for all page structure content requests,
resulting in invalid error messages for commands such as "kmem -s",
"kmem -p", "kmem -f", etc. A secondary issue is that there is no
current manner for the crash utility to be able to translate vmemmap
addresses because there is no record of the the mapping stored in the
kernel. That being the case, any command that needs to read the
contents of a page structure will fail. During initialization, the
message "WARNING: cannot translate vmemmap kernel virtual addresses:
commands requiring page structure contents will fail" will alert the
user of the problem. During runtime, an attempt to read the contents
of a vmemmap'd page structure will fail with the error message
"<command>: cannot translate vmemmap address: <vmemmap address>".

- Fix for segmentation violation when running the "ps -r" command
option on 2.6.25 or later kernels.

- Fix for the "mount" command on 2.6.32 and later kernels. Without the
patch, the command would fail immediately with the error message
"mount: invalid structure member offset: super_block_s_dirty". Also,
the "mount -i" option will no longer be supported in 2.6.32 and later
kernels because the super_block.s_dirty linked list no longer exists.

- Fix for the "bt" command on 2.6.29 and later x86_64 kernels to
always recognize and display BUG()-induced exception frames. Without
the patch, the backtrace would potentially not display the exception

- Fix for the "rd" and "kmem" commands to prevent the unnecessary
"WARNING: sparsemem: invalid section number: <number>" message
when testing whether an address is represented by a page structure

- Fix for a 4.0-8.11 regression that introduced a bug in determining
the number of cpus in ppc64 kernels when the cpu_possible_[map/mask]
has more cpus than the cpu_online_[map/mask]. In that case, the
kernel contains per-cpu runqueue data and "swapper" tasks for the
extra cpus. Without the patch, on systems with a possible cpu count
that is larger than its online cpu count:
(1) the "sys" command will reflect the possible cpu count.
(2) the "ps" command will show the existent-but-unused "swapper"
tasks as active on the extra cpus.
(3) the "set" command will allow the current context to be set to
any of the existent-but-unused "swapper" tasks.
(4) the "runq" command will display existent-but-unused runqueue
data for the extra cpus.
(5) the "bt" command on the existent-but-unused "swapper" tasks will
indicate: "bt: cannot determine NT_PRSTATUS ELF note for active
task: <task>" on dumpfiles, and "(active)" on live systems.

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

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