Bug 606414

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Hat Enterprise Linux major release.  Product Management has requested further
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CCing Ryan for the release notes, and Jarek, who may end up handling the kdump documentation in the DG (bug 451059). Assigning to Jarek for now for that reason.

-- Silas

Ryan,

Should I add Neil's description (and others I come across such as this one) to the Technical Notes field, as Tom did with bug 606993? This will make it into the 6_1 (not 6_0) Deployment guide.

Thanks,

Silas

Fixed in Red_Hat_Enterprise_Linux-Deployment_Guide-6-en-US-0.5-36.

http://documentation-stage.bne.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Deployment_Guide/ch-kdump.html#s2-kdump-configuration-gui

The "Displaying a Backtrace" page in the document is really strange:

http://documentation-stage.bne.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Deployment_Guide/s2-kdump-crash-backtrace.html

It shows this:

crash> bt
PID: 5108   TASK: ee939980  CPU: 0   COMMAND: "bash"
 #0 [eeabfde8] ia32_sysenter_target at c0465b5c
 #1 [eeabfe3c] oops_end at c077209b
 #2 [eeabfe50] ia32_sysenter_target at c04206ac
    EAX: 00000000  EBX: c08833f3  ECX: 00000000  EDX: 00000046
    DS:  fffffed8      ESI: 00000002  ES:  fffffe8c      EDI: c076ee9d
    SS:  0001      ESP: c04207f4  EBP: ee939980  GS:  0002
    CS:  ffff8210      EIP: 00000000  ERR: eeabfed8  EFLAGS: eeabfea4

I thought this might be a crash bug because it's missing several
frames, the exception frame, etc.

So I create another x86 dumpfile from a 2.6.32-69.el6 kernel, with
kexec-tools-2.0.0-143.el6 to see if I could reproduce the above
with a "echo c > /proc/sysrq-trigger".  But when I do it, the
backtrace is correct:

crash> bt
PID: 5591   TASK: f196d560  CPU: 2   COMMAND: "bash"
 #0 [ef4dbdcc] crash_kexec at c0494922
 #1 [ef4dbe20] oops_end at c080e402
 #2 [ef4dbe34] no_context at c043089d
 #3 [ef4dbe58] bad_area at c0430b26
 #4 [ef4dbe6c] do_page_fault at c080fb9b
 #5 [ef4dbee4] error_code (via page_fault) at c080d809
    EAX: 00000063  EBX: 00000063  ECX: c09e1c8c  EDX: 00000000  EBP: 00000000 
    DS:  007b      ESI: c0a09ca0  ES:  007b      EDI: 00000286  GS:  00e0
    CS:  0060      EIP: c068124f  ERR: ffffffff  EFLAGS: 00010096 
 #6 [ef4dbf18] sysrq_handle_crash at c068124f
 #7 [ef4dbf24] __handle_sysrq at c0681469
 #8 [ef4dbf48] write_sysrq_trigger at c068150a
 #9 [ef4dbf54] proc_reg_write at c0569ec2
#10 [ef4dbf74] vfs_write at c051de4e
#11 [ef4dbf94] sys_write at c051e8cc
#12 [ef4dbfb0] system_call at c0409ad5
    EAX: ffffffda  EBX: 00000001  ECX: b7776000  EDX: 00000002 
    DS:  007b      ESI: 00000002  ES:  007b      EDI: b7776000
    SS:  007b      ESP: bfcb2088  EBP: bfcb20b4  GS:  0033
    CS:  0073      EIP: 00edc416  ERR: 00000004  EFLAGS: 00000246 
crash>

If the dumpfile which was used for the document example is still
around, I would like to see it.

In any case, the document's backtrace is really misleading.

I can re-create each of the crash-utility output segments 
that are shown in the document, and attach them to this BZ.

Would that be helpful?

Created attachment 440935 [details]
crash documentation update

Updated output for these examples:

Example 30.3. Running the crash utility
Example 30.4. Displaying the kernel message buffer
Example 30.5. Displaying the kernel stack trace
Example 30.6. Displaying status of processes in the system
Example 30.7. Displaying virtual memory information of the current context
Example 30.8. Displaying information about open files of the current context

Red Hat Enterprise Linux 6.0 is now available and should resolve
the problem described in this bug report. This report is therefore being closed
with a resolution of CURRENTRELEASE. You may reopen this bug report if the
solution does not work for you.