Debian Bug report logs - #865442
gdb: x86-64: "cannot find thread-local variables

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Package: gdb; Maintainer for gdb is Héctor Orón Martínez <[email protected]>; Source for gdb is src:gdb (PTS, buildd, popcon).

Reported by: [email protected]

Date: Wed, 21 Jun 2017 13:48:01 UTC

Severity: normal

Tags: upstream

Found in version gdb/7.12-6

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Subject: Bug#865442: correction: errno is special, python is not the problem
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Control: retitle -1 gdb: x86-64: "cannot find thread-local variables
on this target"

Further experimentation indicates that this is a problem with
thread-local variables in general and there's something special about
'errno' that makes it appear to work; the Python interface is not the
problem.  For instance:

$ cat test.c
#include <stdio.h>
#include <errno.h>
static _Thread_local int foo;
int main(void)
{
  printf("%d %d\n", errno, foo);
}
$ gcc -g test.c
$ gdb ./a.out
...
(gdb) b main
Breakpoint 1 at 0x749: file test.c, line 6.
(gdb) r
Starting program: /home/zack/a.out

Breakpoint 1, main () at test.c:6
6      printf("%d %d\n", errno, foo);
(gdb) p errno
$1 = 0
(gdb) p foo
Cannot find thread-local storage for process 13090, executable file
/home/zack/a.out:
Cannot find thread-local variables on this target

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