gumkowsk@nadc.arpa (D. Gumkowski) (11/10/89)
Hopefully someone who has experienced a like problem or someone who is wizardly in the networking arena can shed some light on a situation that is occurring at our site. Virtually each time our PSN is reloaded our VAX 11/780 running an almost vanilla Berkeley UNIX 4.3 (definitely vanilla in the network area) crashes with a "panic: Segmentation fault". Some basic history: The problem started occurring in the timeframe that our IMP was changed to a PSN. Near the same time we also incorporated the bug fixes that were available from Berkeley. The "netimp" directory in the bug fixes directory was applied to our system. Some observations: (1) We no longer get messages telling us that our IMP (PSN) is going down in 30 seconds or messages telling us that our IMP (PSN) has been marked down. We do get the "interface reset" message. (2) If we take the PSN down with "/etc/config" before the reload occurs and bring it back up after the reload occurs, the system does not crash. This is not feasible since we are usually not notified when the network control center reloads our PSN. (3) The crash appears to occur (though not absolutely positive) in the module _impstart which is in "if_imp.c". We are currently running Berkeley version 7.5 dated 5/6/88. The previous version before upgrading "netimp" was Berkeley version 7.1 dated 6/4/86. (4) All other network operations seem to be working fine. Questions: (1) Are we running software that is known to be bad? (2) Is the network control center we are tied to not appropriately telling our system that the node is going to go down? Thank-you in advance for any help anyone can give. David A. Gumkowski, Naval Air Development Center <gumkowsk@nadc.arpa>