go - Panic during panic -

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when running http server in go (go1.2.1 linux/amd64) rare error.

unexpected fault address 0xb84004 fatal error: fault [signal 0x7 code=0x2 addr=0xb84004 pc=0x421d62]  goroutine 1 [running]: unexpected fault address 0xacb59c panic during panic

this happened once, far, after week of running , not reproducible. however, still know means , how happen. unfortunately cannot provide code sample, since don't know might occur , code not open source (yet), i'm looking more general answer. anyone?


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