Comment 0 for bug 1821677

With following testcase:

~/work/glibc$ cat foo.c

#include <dlfcn.h>
#include <stdio.h>

int main(int argc, char **argv) {
  if (argc < 1) return 1;
  printf("Trying to open %s\n", argv[1]);
  void *liball = dlopen(argv[1], RTLD_NOW);
  if(liball == NULL) {
    printf("\nERROR: %s", dlerror());
    return -1;
  }
  if(dlclose(liball)==0) {printf("\n all ok\n");}
  return 0;
}

compile with
~/work/glibc$ gcc -O0 -g foo.c -ldl

then get segment fault:

~/work/glibc$ ./a.out intel64_lin/libsvml.so
Trying to open intel64_lin/libsvml.so
Segmentation fault (core dumped)

coredump as:

(gdb) bt
#0 __GI___libc_free (mem=0x7ffff7d49010) at malloc.c:3085
#1 0x00007ffff7fdb6b6 in open_verify (
    name=0x555555559670 "/home/lilicui/intel64_lin/libsvml.so",
    fbp=fbp@entry=0x7fffffffd530, loader=<optimized out>,
    mode=mode@entry=-1879048190,
    found_other_class=found_other_class@entry=0x7fffffffd51f, free_name=true,
    whatcode=0, fd=3) at dl-load.c:1977
#2 0x00007ffff7fdc926 in _dl_map_object (loader=loader@entry=0x7ffff7ffe190,
    name=name@entry=0x7fffffffe1b7 "/home/lilicui/intel64_lin/libsvml.so",
    type=type@entry=2, trace_mode=trace_mode@entry=0,
    mode=mode@entry=-1879048190, nsid=<optimized out>) at dl-load.c:2401
#3 0x00007ffff7fe79c4 in dl_open_worker (a=a@entry=0x7fffffffdaa0)
    at dl-open.c:228
#4 0x00007ffff7f1b48f in __GI__dl_catch_exception (exception=<optimized out>,
    operate=<optimized out>, args=<optimized out>) at dl-error-skeleton.c:196
#5 0x00007ffff7fe72c6 in _dl_open (
    file=0x7fffffffe1b7 "/home/lilicui/intel64_lin/libsvml.so",
    mode=-2147483646, caller_dlopen=0x5555555551cb <main+86>,
    nsid=<optimized out>, argc=2, argv=0x7fffffffde08, env=0x7fffffffde20)
    at dl-open.c:599
#6 0x00007ffff7faa256 in dlopen_doit (a=a@entry=0x7fffffffdcc0) at dlopen.c:66
#7 0x00007ffff7f1b48f in __GI__dl_catch_exception (
    exception=exception@entry=0x7fffffffdc60, operate=<optimized out>,
--Type <RET> for more, q to quit, c to continue without paging--
    args=<optimized out>) at dl-error-skeleton.c:196
#8 0x00007ffff7f1b51f in __GI__dl_catch_error (
    objname=0x7ffff7fae0f0 <last_result+16>,
    errstring=0x7ffff7fae0f8 <last_result+24>,
    mallocedp=0x7ffff7fae0e8 <last_result+8>, operate=<optimized out>,
    args=<optimized out>) at dl-error-skeleton.c:215
#9 0x00007ffff7faaa25 in _dlerror_run (
    operate=operate@entry=0x7ffff7faa200 <dlopen_doit>,
    args=args@entry=0x7fffffffdcc0) at dlerror.c:163
#10 0x00007ffff7faa2e6 in __dlopen (file=<optimized out>, mode=<optimized out>)
    at dlopen.c:87
#11 0x00005555555551cb in main (argc=2, argv=0x7fffffffde08) at foo.c:7

intel64_lin/libsvml.so is icc19.0(aleady released) runtime library, refer to attachment.

Ubuntu version:

~/work/glibc$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 18.10
Release: 18.10
Codename: cosmic

Glibc version:

~/work/glibc$ ldd --version
ldd (Ubuntu GLIBC 2.28-0ubuntu1) 2.28
Copyright (C) 2018 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Written by Roland McGrath and Ulrich Drepper.

It works fine with Glibc_2.28 upstream, and Glibc_2.28 on Fedora 29, but failed with Glibc 2.28 in Ubuntu 18.10

I found ubuntu18.10 was backporting its own patches, would that affect such testcase?