[gdal-dev] OGRCoordinateTransformation::Transform with multiple threads

[Песоцкий Максим]

Hi All

 

my question is

starting from gdal-3.x OGRCoordinateTransformation object (::Transform() in particular) is not intended to be used by multiple threads?

With gdal-2.4 it worked fine.

 

details:

 

We have upgraded from using gdal-2.4.3 to gdal-3.1.2 and started to get crashes in multi-threaded code with this stack

 

#3 OGRSpatialReference::GetAxis(char const*, int, OGRAxisOrientation*) const gdal-3.1.2/ogr/ogrspatialreference.cpp:9603
#4 OGRProjCT::Transform(int, double*, double*, double*, double*, int*) gdal-3.1.2/ogr/ogrct.cpp:1686
#5 OGRCoordinateTransformation::Transform(int, double*, double*, double*, int*) gdal-3.1.2/ogr/ogrct.cpp:1487

 

ogrspatialreference.cpp:9603 line is const char * assignment to CPLString

d->m_osAxisName[iAxis] = pszName;

 

all threads are using the same OGRCoordinateTransformation object and here race between multiple threads could produce double-free (#1-#2 part of stack)

 

with gdal-2.4.3 it looked different

OGRProj4CT::Transform was not calling GetAxis

and even GetAxis itself did not use temporary libproj context with axis name, but only it's internal structure

 

Regards

Maxim

 

 

 

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