Luckily I found out that this issue was caused by 1 special .so I had loaded
automatically with LD_PRELOAD.
It was "libusb-driver.so" used by Xilinx Impact tool for communication with
JTAG.
So with this library preloaded this simple test (built with "gcc test.c")
crashes on the second "getc":
=========
#include <stdio.h>
char * filename = "luac.out";
int main (void)
{
FILE* f;
int c;
f = fopen(filename, "r");
if (f == NULL) {
printf("Cannot open file %s\n", filename);
return -1;
}
printf("File %s opened successfully\n", filename);
c = getc(f);
printf("c: %x\n", c);
f = freopen(filename, "rb", f);
if (f == NULL) {
printf("Cannot re-open file %s in binary mode\n", filename);
return -1;
}
printf("File %s re-opened in binary mode successfully\n", filename);
c = getc(f);
printf("c: %x\n", c);
if (filename)
fclose(f);
return 0;
}
=========
If I disable library preload application gets executed without problems.
Moreover if I build this test statically everything will work as well.
So it is definitely not a problem in Lua.
Might be eglibc or dynamic linker.
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https://bugs.launchpad.net/bugs/1136432
Title:
luaL_loadfile segfault in _IO_file_underflow
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