Malformed flame graph when importing delta heap profile from Go

[kolesnikovae]

It has been reported that importing a delta heap profile from Go in the ad-hoc view results in a malformed flame graph. It’s worth noting that the pprof tool does not handle this properly either. Apparently, samples with negative values are not sanitized.

A delta profile can be collected using the standard Go pprof HTTP endpoint:

curl http://127.0.0.1:12345/debug/pprof/heap?seconds=30 > heap.pprof

The issue affects inuse_* samples the most.