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Cisco Bug: CSCur72281 - sessmgr crash at 17.0 - acs_free_dns_session() sp=0xffffcf08

Last Modified

Jan 30, 2017

Products (1)

  • Cisco ASR 5000 Series

Known Affected Releases

17.0.0.57028 17.0.1

Description (partial)

Symptom:
sessmgr crash 


********************* CRASH #01 ***********************
SW Version          : 17.0.0
Similar Crash Count : 1
Time of First Crash : 2014-Nov-13+13:55:41

Assertion failure at acs/acsmgr/acsmgr_buffer.c:138
  Function: acsmgr_release_buffer()
  Expression: cache_info->mem_block_preamble.signature == mem_block->signature
  Proclet: sessmgr (f=87000,i=177)
  Process: card=4 cpu=1 arch=X pid=6687 cpu=~9% argv0=sessmgr
  Crash time: 2014-Nov-13+13:55:41 UTC
  Recent errno: 11 Resource temporarily unavailable
  Stack (6088@0xffffc000):
    [ffffe430/X] __kernel_vsyscall() sp=0xffffcd98
    [0adcdcaf/X] sn_assert() sp=0xffffcdd8
    [084cf0cb/X] acsmgr_release_buffer() sp=0xffffce48
    [08956910/X] acs_free_dns_lists() sp=0xffffce88
    [08959b86/X] acs_free_dns_session() sp=0xffffcf08
    [085ba36c/X] acsmgr_periodic_idle_data_sessions_cleanup() sp=0xffffd0a8
    [087ead78/X] acsmgr_check_50_msec_timer() sp=0xffffd178
    [053cf910/X] tlib_serv() sp=0xffffd1c8
    [053cf550/X] tlib_tmr_tick() sp=0xffffd218
    [04827612/X] snx_timer_service() sp=0xffffd228
    [0482551f/X] snx_fast_service() sp=0xffffd258
    [05ffeeba/X] sessmgr_snx_tick_callback() sp=0xffffd298
    [0ae6ccb9/X] sn_loop_run() sp=0xffffd748
    [0abdf3cd/X] main() sp=0xffffd7b8

Conditions:
Crash seen after upgrade to R17. In 17.x when string buffer cache is released, we do the validation with the metadata. Here metada is corrupt and hence there is an assert.
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