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Cisco Bug: CSCuo46609 - Crash due to I/O corruption with SSL VPN

Last Modified

Oct 31, 2019

Products (98)

  • Cisco IOS
  • Cisco C897VA Integrated Services Router
  • Cisco 886VA-CUBE Integrated Services Router
  • Cisco 888W Integrated Services Router
  • Cisco 2951 Integrated Services Router
  • Cisco VG204XM Analog Voice Gateway
  • Cisco 812 CiFi Integrated Services Router
  • Cisco 892W Integrated Services Router
  • Cisco 886VAG 3G Integrated Services Router
  • Cisco 819 Hardened Integrated Services Router
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Known Affected Releases

15.2(4)M2 15.3(3)M2

Description (partial)

A router configured as an SSL VPN hub may experience a crash due to memory corruption in the I/O pool. The following may be observed in the crashinfo file:

<i>validblock_diagnose, code = 1

current memory block, bp = 0xC020750,
memorypool type is I/O
data check, ptr = 0xC020780

next memory block, bp = 0xC020890,
memorypool type is I/O
data check, ptr = 0xC0208C0

previous memory block, bp = 0xC020610,
memorypool type is I/O
data check, ptr = 0xC020640

<memory dump omitted>

Apr 24 13:32:27.860: %SYS-3-OVERRUN: Block overrun at C020750 (red zone 75F405A7)
-Traceback= 60213FD4z 60217688z 649D8D98z 649D54A0z 63C66204z 63C661E8z
Apr 24 13:32:27.860: %SYS-6-MTRACE: mallocfree: addr, pc
 52E00584,63462AA0 52E00584,63462670 52E00584,30000012 5266D34C,62E3E0B8
 52670418,62E3E0B8 53A44BE0,60000284 53A444CC,626CF044 50B6BC0C,62E63294
Apr 24 13:32:27.860: %SYS-6-MTRACE: mallocfree: addr, pc
 5310B904,62E23040 50B6BC0C,62E58E78 50B6BC0C,3000002E 53A45014,6000006A
 53A44BE0,64C7A348 53A44BE0,64C79E10 53A44BE0,40000202 53929890,60000266
Apr 24 13:32:27.860: %SYS-6-BLKINFO: Corrupted redzone blk C020750, words 136, alloc 602191F4, InUse, dealloc A2A4170, rfcnt 1
-Traceback= 64049030z 60213FD4z 60217688z 649D8D98z 649D54A0z 63C66204z 63C661E8z
Apr 24 13:32:27.864: %SYS-6-MEMDUMP: 0xC020750: 0xAB1234CD 0xFFFE0000 0x0 0x6500240C
Apr 24 13:32:27.864: %SYS-6-MEMDUMP: 0xC020760: 0x602191F4 0xC020890 0xC020624 0x80000088
Apr 24 13:32:27.864: %SYS-6-MEMDUMP: 0xC020770: 0x1 0x0 0x1000001 0x682757A8

%Software-forced reload

 14:32:27 SUMMER Thu Apr 24 2014: Breakpoint exception, CPU signal 23, PC = 0x6064C738</i>

This has been observed on the following conditions:
1. 7200 router running Cisco IOS Release 15.2(4)M2 and 15.3(3)M2.
2. Router is configured as an SSL VPN host.
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