[Bug 2085548] Re: [UBUNTU 24.10] bash printf of floating point value fails on Ubuntu 24.10

[Julian Andres Klode]

We'd like to mark this a duplicate of
https://bugs.launchpad.net/ubuntu/+source/bash/+bug/2083131 but it's not
clear what happens to the bug proxy then, let us know if that's
agreeable.

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Title:
  [UBUNTU 24.10] bash printf of floating point value fails on Ubuntu
  24.10

Status in Ubuntu on IBM z Systems:
  Confirmed
Status in bash package in Ubuntu:
  Confirmed

Bug description:
  == Comment: #1 - Boris Barth <Boris.mail at de.ibm.com> - 2024-10-24 09:55:01 ==
  ---Problem Description---
  bash printf of floating point value fails on Ubuntu 24.10
   
  ---uname output---
  Linux tuxmaker 6.11.0-8-generic #8-Ubuntu SMP Mon Sep 16 12:49:35 UTC 2024 s390x s390x s390x GNU/Linux
   
  Machine Type = IBM z16 Model A01 
   
  ---Steps to Reproduce---
  Ubuntu 24.10 on s390x:

  $ bash -c "printf '%f\n' 1.1"
  [1]    3372599 segmentation fault  bash -c "printf '%f\n' 1.1"

  
  Ubuntu 24.10 on x86-64:

  $ docker run -it --rm public.ecr.aws/docker/library/ubuntu:24.10
  root at 99a22af7f0f4:/# bash -c "printf '%f\n' 1.1"
  nan

  
  It used to work on Ubuntu 24.04 on x86-64 (and s390x):

  $ docker run -it --rm public.ecr.aws/docker/library/ubuntu:24.04
  root at 61fbb357246c:/# bash -c "printf '%f\n' 1.1"
  1.100000

  
  In GDB on Ubuntu 24.10 on s390x:

  ...
  Program received signal SIGSEGV, Segmentation fault.
  Download failed: Invalid argument.  Continuing without source file ./stdio-common/vfprintf-internal.c.
  0x000003fff7d716fc in __printf_buffer (buf=buf at entry=0x3ffffff9240, format=format at entry=0x2aa001ad000 "%.3Lf", ap=ap at entry=0x3ffffff9398, mode_flags=mode_flags at entry=2) at
  vfprintf-internal.c:996
  warning: 996    vfprintf-internal.c: No such file or directory
  (gdb) x/i $pc

  => 0x3fff7d716fc <__printf_buffer+1308>:        ld      %f1,0(%r7)
  (gdb) p/x $r7
  $1 = 0x2
  (gdb) disassm __printf_buffer
  ...
     0x000003fff7d716f6 <+1302>:  lg      %r7,0(%r1)
  => 0x000003fff7d716fc <+1308>:  ld      %f1,0(%r7)
  ...
  (gdb) p/x $r1
  $2 = 0x3ffffff93e0
  (gdb) p/x *(uint64_t *)$r1
  $3 = 0x2

  Userspace tool obtained from project website:  na 
   
  Userspace tool common name: bash 

  Userspace package version: 5.2.32-1ubuntu1 
   
  The userspace tool has the following bit modes: 64-bit

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