Bug#918023: valgrind: helgrind+drd false positives with glibc 2.28

[Adam Borowski]

Package: valgrind
Version: 1:3.14.0-2
Severity: normal

Hi!
It looks like helgrind and drd find a lot of false positives in glibc code,
even on a threaded hello world:

.--====
#include <stdio.h>
#include <stdint.h>
#include <pthread.h>

#define NTHREADS 2

static void *
worker(void *arg)
{
        printf("Thread %ld\n", (intptr_t)arg);

        return NULL;
}

int main()
{
        pthread_t th[NTHREADS];

        for (int i = 0; i < NTHREADS; i++)
                pthread_create(&th[i], NULL, worker, (void *)(intptr_t)i);

        for (int i = 0; i < NTHREADS; i++)
                pthread_join(th[i], NULL);

        return 0;
}
`----


-- System Information:
Debian Release: buster/sid
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'unstable'), (500, 'testing'), 
(150, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.20.0-debug-02988-gdc7ccfbd7309 (SMP w/6 CPU cores)
Locale: LANG=C.UTF-8, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE=C.UTF-8 
(charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: sysvinit (via /sbin/init)

Versions of packages valgrind depends on:
ii  libc6      2.28-4
ii  libc6-dbg  2.28-4

Versions of packages valgrind recommends:
ii  gdb           8.2-1
ii  valgrind-dbg  1:3.14.0-2

Versions of packages valgrind suggests:
pn  alleyoop      <none>
pn  kcachegrind   <none>
pn  valgrind-mpi  <none>
pn  valkyrie      <none>

-- no debconf information