Meaning of "Assertion `!response->fail()' failed"

[asa...@ncsu.edu]

I'm running a program that I've heavily instrumented with custom magic instructions to communicate info with SNIPER.

On most runs it seems fine. However on very large inputs I get this kind of error (attached below) as soon as it enters the ROI.

I'm assuming it means an issue with the magic instructions, but what could be causing it, and why would it be intermittent with only large inputs?

```

[SNIPER] Setting instrumentation mode to DETAILED

[SIFT_RECORDER] sift_writer.cc:747: uint64_t Sift::Writer::Magic(uint64_t, uint64_t, uint64_t): Assertion `!response->fail()' failed.
[SNIPER] End
```

[Trevor E. Carlson]

Hello,

In this case, it is difficult to know the exact root cause of the problem, but we can derive what is happening here by looking at where the error is coming from. In this case, we can see that the Sift::Writer is having issues communicating with the backend (Sniper binary) because the pipe has been closed. But, this isn’t necessarily a problem. If the Sniper backend closed because the application has ended, having a front-end that disconnects here isn’t necessarily an issue. You could look into why the backend is ending (cleanly or not) to debug this issue further.

Trevor

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