[rawhide]: s390x: qemu-x86_64-static segfaults

[nikita-dubrovskii]

Describe the bug

qemu-x86_64-static fails with Segmentation fault (core dumped).

The kola test ext.config.binfmt.qemu fails

Reproduction steps

$ qemu-x86_64-static --version

Expected behavior

$ qemu-x86_64-static --version
SOME_VERISON_HERE

Actual behavior

$ qemu-x86_64-static --version
Segmentation fault (core dumped)

System details

• QEMU
• FCOS 42 rawhide

Butane or Ignition config

No response

Additional information

Installed rpm: qemu-user-static-x86-9.2.0-0.1.rc1.fc42.s390x

[iii-i]

Backtrace:

(gdb) bt
#0  0x000003ffaeaa903e in resolve_g_str_is_ascii ()
#1  0x000003ffaeb4c0e6 in _dl_relocate_static_pie ()
#2  0x000003ffaeae2f8c in __libc_start_main_impl ()
#3  0x000003ffae8c610a in _start ()

Disassembly:

Dump of assembler code for function resolve_g_str_is_ascii:
   0x000003ffaeaa9020 <+0>:     stmg    %r14,%r15,112(%r15)
   0x000003ffaeaa9026 <+6>:     ear     %r4,%a0
   0x000003ffaeaa902a <+10>:    lay     %r15,-224(%r15)
   0x000003ffaeaa9030 <+16>:    sllg    %r14,%r4,32
   0x000003ffaeaa9036 <+22>:    ear     %r14,%a1
   0x000003ffaeaa903a <+26>:    la      %r5,168(%r15)
=> 0x000003ffaeaa903e <+30>:    mvc     216(8,%r15),40(%r14)

This is an ifunc resolver, which tries to use thread-local storage. I think thread-local storage is not available this early on s390x. @stliibm may have a more precise explanation for this.

In any case, resolve_g_str_is_ascii() has been removed by https://gitlab.gnome.org/GNOME/glib/-/commit/96205fc7fe938df268735a3c7d78fa85924f8fc7, so as a short-term solution I would suggest adding this patch to glib.

[iii-i]

A bit more info from a private conversation with @stliibm:

If this is an ifunc-resolver, this looks like stack-protector?
In glibc the ifunc-resolvers are marked with: inhibit_stack_protector
https://sourceware.org/git/?p=glibc.git;a=blob;f=include/libc-symbols.h;h=4367aa6740bff6fc6b42b562f5d9a95b6690bc50;hb=HEAD#l365

So an alternative approach would be to add this annotation to glib's resolve_g_str_is_ascii().

[nikita-dubrovskii]

BZ: https://bugzilla.redhat.com/show_bug.cgi?id=2330748