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Cisco Bug: CSCuw41977 - msg_send() wrongly returns ETIMEDOUT under certain race condition

Last Modified

Jul 21, 2018

Products (3)

  • Cisco Network Convergence System 6000 Series Routers
  • Cisco NCS 6008 - 8-Slot Chassis
  • Cisco IOS XR Software

Known Affected Releases

5.2.4.BASE

Description (partial)

Symptom:
The show process blocked shows that tcp/udp/ping is blocked on lpts_pa process:

RP/0/RP0/CPU0:NCS6k#sh process bloc
Thu Feb 25 13:05:55.586 UTC
PID    TID    ProcessName      State        TimeInState  MiscInfo
 
   9141   9423         mpls_ldp Reply        630:52:59.445 9174   lspv_server
   9109   9448       te_control Reply        630:52:55.245 9174   lspv_server
   5380   6209        l2vpn_mgr Reply        630:53:00.303 9174   lspv_server 
   4315   5057              tcp Reply        410:02:11.901 3225   lpts_pa
   4316   5464              udp Reply        352:01:55.658 3225   lpts_pa
   4316   5237              udp Mutex        351:51:38.634 0x7f819800bdc0 5464 udp so_lock_with_trace:590
   4316   5216              udp Mutex        352:01:54.354 0x7f819800bdc0 5464 udp so_lock_with_trace:590
   4316   5212              udp Mutex        352:01:55.238 0x7f819800bdc0 5464 udp so_lock_with_trace:590
  4316   5215              udp Mutex        352:01:54.359 0x7f819800bdc0 5464 udp so_lock_with_trace:590
   4316   5214              udp Mutex        352:01:51.869 0x7f819800bdc0 5464 udp so_lock_with_trace:590
   4316   5213              udp Mutex        352:01:53.763 0x7f819800bdc0 5464 udp so_lock_with_trace:590
   4316   5210              udp Mutex        352:01:53.752 0x7f819800bdc0 5464 udp so_lock_with_trace:590
   4316   5211              udp Mutex        352:01:55.299 0x7f819800bdc0 5464 udp so_lock_with_trace:590
   4316   5209              udp Mutex        352:01:53.797 0x7f819800bdc0 5464 udp so_lock_with_trace:590
   4316   4316              udp Mutex        352:01:55.505 0x7f819800bdc0 5464 udp so_lock_with_trace:590
   4360   4535          lpts_fm Reply        410:02:10.904 3225   lpts_pa

Conditions:
The router reports below lpts timeout error like below after which the ssh/telnet/ping/sftp stops working on the router:
RP/0/RP0/CPU0:Sep 19 03:14:44.000 UTC: lpts_pa[283]: %OS-PA-4-FM_MSG_TIMEOUT : 'pa_fm_handle_dl_timeouts: IFIB update of slice BGP6_FM to node 1000 timed out.'

RP/0/RP0/CPU0:Feb  8 11:04:14.001 : lpts_pa[129]:
%OS-PA-4-FM_MSG_TIMEOUT : 'pa_fm_handle_dl_timeouts: IFIB update of slice TCP4_FM to node
1000 timed out.'
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