https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124386
Bug ID: 124386
Summary: [15 regression] regex crash on long string
Product: gcc
Version: 15.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: schueller at phimeca dot com
Target Milestone: ---
this crashes at O0 (ok at O1 and greater) with gcc 15.2, 14.x is ok according
to godebolt
#include <regex>
int main()
{
std::string line(22000, 'a');
std::smatch what;
std::regex reg(R"((\w*))");
std::regex_match(line, what, reg);
return 0;
}
https://godbolt.org/#g:!((g:!((g:!((h:codeEditor,i:(filename:'1',fontScale:14,fontUsePx:'0',j:1,lang:c%2B%2B,selection:(endColumn:2,endLineNumber:10,positionColumn:2,positionLineNumber:10,selectionStartColumn:2,selectionStartLineNumber:10,startColumn:2,startLineNumber:10),source:'%23include+%3Cregex%3E%0A%0Aint+main()%0A%7B%0A++++std::string+line(22000,+!'a!')%3B%0A++++std::smatch+what%3B%0A++++std::regex+reg(R%22((%5Cw*))%22)%3B%0A++++std::regex_match(line,+what,+reg)%3B%0A++++return+0%3B%0A%7D'),l:'5',n:'0',o:'C%2B%2B+source+%231',t:'0')),k:50,l:'4',n:'0',o:'',s:0,t:'0'),(g:!((g:!((h:compiler,i:(compiler:g152,filters:(b:'0',binary:'1',binaryObject:'1',commentOnly:'0',debugCalls:'1',demangle:'0',directives:'0',execute:'0',intel:'0',libraryCode:'0',trim:'1',verboseDemangling:'0'),flagsViewOpen:'1',fontScale:14,fontUsePx:'0',j:1,lang:c%2B%2B,libs:!(),options:'-Wall+-Wextra+-Wpedantic+-O0',overrides:!(),selection:(endColumn:1,endLineNumber:1,positionColumn:1,positionLineNumber:1,selectionStartColumn:1,selectionStartLineNumber:1,startColumn:1,startLineNumber:1),source:1),l:'5',n:'0',o:'+x86-64+gcc+15.2+(Editor+%231)',t:'0')),k:50,l:'4',m:50,n:'0',o:'',s:0,t:'0'),(g:!((h:output,i:(compilerName:'MinGW+gcc+13.1.0',editorid:1,fontScale:14,fontUsePx:'0',j:1,wrap:'1'),l:'5',n:'0',o:'Output+of+x86-64+gcc+15.2+(Compiler+%231)',t:'0')),header:(),l:'4',m:50,n:'0',o:'',s:0,t:'0')),k:50,l:'3',n:'0',o:'',t:'0')),l:'2',n:'0',o:'',t:'0')),version:4
