strange crash when scan vector in golang/cgo

[flier]

Hi, I'm maintain a golang binding for hyperscan, there is a strange crash issue was reported, which can be reproduced after thousands of scan vector calls.

This stack trace comes from running this test program.

It seems some memory was corrupt, are there any pointer will be saved in the compile and scan phases? Because golang use a GC to manage all the memory, the GO pointer passed to hyperscan can't be saved after call.

Besides, I also tried to lock the scanning goroutine to its current thread with runtime. LockOSThread , but it seems no effects.

Thanks

[brknstrngz]

The data pointer is stored in the scratch in populateCoreInfo() via hs_scan_stream_internal() via hs_scan_vector() and then used in hwlmExecStreaming().

I have tried working around this by creating new data (in Go) and ensuring it is reachable just before calling into the wrapped hs_scan_vector(), that should not corrupt the pointer (I think).

[flier]

We found it caused by Golang aggressive GC strategy.