Bug 164637
| Summary: | [libc] Problem with vsnprintf in libc.so when compiled with clang | ||||||
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| Product: | Base System | Reporter: | Pierre-Luc Drouin <pldrouin> | ||||
| Component: | kern | Assignee: | freebsd-bugs (Nobody) <bugs> | ||||
| Status: | Closed Works As Intended | ||||||
| Severity: | Affects Only Me | CC: | theraven | ||||
| Priority: | Normal | ||||||
| Version: | 9.0-STABLE | ||||||
| Hardware: | Any | ||||||
| OS: | Any | ||||||
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The string0 argument is not a valid va_list, so this test case appears to be invalid. Please reopen if you have a test case that does not rely on undefined behaviour. |
When FreeBSD world (and kernel) is built using clang, the resulting code generated for vsnprintf in the library libc.so does not work properly, causing a segmentation fault. The problem was discovered when attempting to use java on FreeBSD. How-To-Repeat: Compile and run the following C code on FreeBSD 9.0-STABLE built with clang: #include <stdio.h> #include <string.h> int main(int nargrs, const char* args[]) { const char* msg="Hello World!"; int length=strlen(msg); printf("length is %i\n",length); char string0[256]; char string[256]; memset(string0,1,256); strcpy(string0,msg); vsnprintf(string+1,length,"%s",string0); printf("%s\n",string); return 0; } Alternatively, try launching java or javac from jdk16, diablo-jdk16 or openjdk6