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9 Commits

Author SHA1 Message Date
Dave Anderson
045c00ac34 Added recognition of the new DUMP_DH_COMPRESSED_INCOMPLETE flag in
the header of compressed kdumps, and the new DUMP_ELF_INCOMPLETE flag
in the header of ELF kdumps.  If the makedumpfile(8) facility fails
to complete the creation of compressed or ELF kdump vmcore files
due to ENOSPC or other error, it will mark the vmcore as incomplete.
If either flag is set, the crash utility will issue a warning that
the dumpfile is known to be incomplete during initialization, just
prior to the system banner display.  When reads are attempted on
missing data, a read error will be returned.  As an alternative,
zero-filled data will be returned if the "--zero_excluded" command
line flag is used, or the "zero_excluded" runtime variable is set
to "on".  In either case, the read errors or zero-filled memory
may cause the crash session to fail entirely, cause commands to
fail, or may result in other unpredictable runtime behavior.
(anderson@redhat.com, zhouwj-fnst@cn.fujitsu.com)
2014-10-30 10:42:38 -04:00
Dave Anderson
d5b362edf7 Implement a new "offline" internal crash variable that can be set to
either "show" (the default) or "hide".  When set to "hide", certain
command output associated with offline cpus will be hidden from view,
and the output will indicate that the cpu is "[OFFLINE]".  The new
variable can be set during invocation on the crash command line via
the option "--offline [show|hide]".  During runtime, or in a .crashrc
or other crash input file, the variable can be set by entering
"set offline [show|hide]".  The commands or options that are affected
when the variable is set to "hide" are as follows:

  o  On X86_64 machines, the "bt -E" option will not search exception
     stacks associated with offline cpus.
  o  On X86_64 machines, the "mach" command will append "[OFFLINE]"
     to the addresses of IRQ and exception stacks associated with
     offline cpus.
  o  On X86_64 machines, the "mach -c" command will not display the
     cpuinfo_x86 data structure associated with offline cpus.
  o  The "help -r" option has been fixed so as to not attempt to
     display register sets of offline cpus from ELF kdump vmcores,
     compressed kdump vmcores, and ELF kdump clones created by
     "virsh dump --memory-only".
  o  The "bt -c" option will not accept an offline cpu number.
  o  The "set -c" option will not accept an offline cpu number.
  o  The "irq -s" option will not display statistics associated with
     offline cpus.
  o  The "timer" command will not display hrtimer data associated
     with offline cpus.
  o  The "timer -r" option will not display hrtimer data associated
     with offline cpus.
  o  The "ptov" command will append "[OFFLINE]" when translating a
     per-cpu address offset to a virtal address of an offline cpu.
  o  The "kmem -o" option will append "[OFFLINE]" to the base per-cpu
     virtual address of an offline cpu.
  o  The "kmem -S" option in CONFIG_SLUB kernels will not display
     per-cpu data associated with offline cpus.
  o  When a per-cpu address reference is passed to the "struct"
     command, the data structure will not be displayed for offline
     cpus.
  o  When a per-cpu symbol and cpu reference is passed to the "p"
     command, the data will not be displayed for offline cpus.
  o  When the "ps -[l|m]" option is passed the optional "-C [cpus]"
     option, the tasks queued on offline cpus are not shown.
  o  The "runq" command and the "runq [-t/-m/-g/-d]" options will not
     display runqueue data for offline cpus.
  o  The "ps" command will replace the ">" active task indicator to
     a "-" for offline cpus.

The initial system information banner and the "sys" command will
display the total number of cpus as before, but will append the count
of offline cpus.  Lastly, a fix has been made for the initialization
time determination of the maximum number of per-cpu objects queued
in a CONFIG_SLAB kmem_cache so as to continue checking all cpus
higher than the first offline cpu.  These changes in behavior are not
dependent upon the setting of the crash "offline" variable.
(qiaonuohan@cn.fujitsu.com)
2014-10-06 15:32:37 -04:00
Dave Anderson
25b61f4a2e Implement support for ARM and ARM64 raw RAM dumpfiles. One or
more "ramdump" files may be entered on the crash command line
in an ordered pair format consisting of the RAM dump filename
and the starting physical address expressed in hexadecimal,
connected with an ampersand:

  $ crash vmlinux ramdump@address [ramdump@address]

A temporary ELF header will be created in /var/tmp, and the
combination of the header and the ramdump file(s) will be handled
like a normal ELF vmcore.  The ELF header will only exist during
the crash session.  If desired, an optional "-o <filename>"
may be entered to create a permanent ELF vmcore file from the
ramdump file(s).
(vinayakm.list@gmail.com, paawan1982@yahoo.com, anderson@redhat.com)
2014-07-31 14:58:26 -04:00
Dave Anderson
f9b816565d Document the "--machdep phys_offset=<physical-address>" command
line option for the ARM64 architecture in the crash.8 man page and
the "crash -h" output.
(anderson@redhat.com)
2014-03-28 14:05:22 -04:00
Dave Anderson
2bb552bed2 Correction for the "crash -h" and crash.8 man page documentation of
the "--machdep phys_base=<physical-address>" command line option.
In both places the parameter mistakenly indicated "physbase".
(ptesarik@suse.cz)
2014-03-20 14:00:51 -04:00
Dave Anderson
5645af9598 Increase the internal hash queue head count from 128 to 32768.
The hash queue is used for gathering and verifying lists, and the
original count of 128 may be overwhelmed if a list is extremely
large.  For example, on a 256GB system with 192GB of free pages,
the "kmem -f" command takes hours to complete; with this patch,
the time is reduced to a few minutes.  In addition, a new command
line option "--hash <count>" has been added to allow a user to
override the default hash queue head count of 32768.
(anderson@redhat.com)
2014-03-13 11:56:30 -04:00
Dave Anderson
b8db9a76e9 Added a new "--kaslr=auto" command line option for X86_64 kernels
that that are configured with CONFIG_RANDOMIZE_BASE.  When set to
"auto", the KASLR relocation value will be determined automatically
by comparing the "_stext" symbol value compiled into the vmlinux file
with the _stext symbol value stored in kdump vmcoreinfo data; on live
systems the comparison will be made with the "_stext" symbol value
that is found in /proc/kallsyms.
(ahonig@google.com, anderson@redhat.com)
2014-02-25 15:28:47 -05:00
Dave Anderson
648d0f62c5 Added a new "--kaslr <offset>" command line option for X86 or
X86_64 kernels that are configured with CONFIG_RANDOMIZE_BASE.
The offset value must be equal to the difference between the
symbol values compiled into the vmlinux file and their relocated
value.
(ahonig@google.com, anderson@redhat.com)
2014-02-21 10:32:04 -05:00
Dave Anderson
03e3937ec7 Initial commit: crash-7.0.4 2014-01-28 16:46:11 -05:00