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Cisco Bug: CSCsy88640 - nested crash in crashinfo collection.

Last Modified

Feb 15, 2018

Products (1)

  • Cisco IOS

Known Affected Releases

12.2SXH 12.2SXI 12.4(24.6)PI11h 12.4(24.6)T4

Description (partial)

Symptoms:
There are two unrelated problems fixed by this bug:

Problem 1:
 A core dump may fail to write, with the following errors seen on the
console: 
 
 current memory block, bp = 0x4B5400A0,

 memorypool type is Exception

 data check, ptr = 0x4B5400D0

 bp->next(0x00000000) not in any mempool

 bp_prev(0x00000000) not in any mempool
 
 writing compressed ftp://10.0.0.1/testuncached_iomem_region.Z

  [Failed]

 writing compressed ftp://10.0.0.1/testiomem.Z

  [Failed]

 writing compressed ftp://10.0.0.1/test.Z

  [Failed]

 %No memory available
 
Problem 2:
A nested crash might occur while generating a crashinfo.  That means that this bug only helps the crashinfo to write properly.  It does not fix the cause of the original crash, but will aid investigation.

Conditions:
Problem 1:
 This is only seen for memory corruption crashes when "exception
region-size" is configured to a value that is not divisible by 4.
 
Problem 2:
BFD must be configured and sending hellos.
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