The only other thing going on at the time (before 23:18:40 and between 23:18:40 and 23:24:40) was some registrations (I have kamailio set up as a registrar), so I eliminated the log messages associated with those for brevity. The local patch that I've applied to log the message and keep things going is:
--- a/modules/uac/uac_reg.c 2015-07-13 10:55:13.596283423 -0400 +++ b/modules/uac/uac_reg.c 2015-07-13 10:57:09.301555783 -0400 @@ -929,7 +929,10 @@ if(reg->expires==0) return 1; if(reg->flags&UAC_REG_ONGOING) - return 2; + if (reg->timer_expires > tn - reg_retry_interval) + return 2; + else + LM_ERR("ONGOING flag still set"); if(reg->flags&UAC_REG_DISABLED) return 4; if(reg->timer_expires > tn + reg_timer_interval + 3) @@ -942,7 +945,7 @@ } reg->timer_expires = tn; reg->flags |= UAC_REG_ONGOING; - reg->flags &= ~UAC_REG_ONLINE; + reg->flags &= ~(UAC_REG_ONLINE|UAC_REG_AUTHSENT); counter_add(regactive, -1); /* Take it out of the active pool while re-registering */ memcpy(uuid, reg->l_uuid.s, reg->l_uuid.len); uuid[reg->l_uuid.len] = '\0';
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