Public bug reported:
== Comment: #1 - Boris Barth <[email protected]> - 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@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@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@entry=0x3ffffff9240,
format=format@entry=0x2aa001ad000 "%.3Lf", ap=ap@entry=0x3ffffff9398,
mode_flags=mode_flags@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
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage)
Status: New
** Tags: architecture-all bugnameltc-210353 severity-medium
targetmilestone-inin---
** Tags added: architecture-all bugnameltc-210353 severity-medium
targetmilestone-inin---
** Changed in: ubuntu
Assignee: (unassigned) => Ubuntu on IBM Power Systems Bug Triage
(ubuntu-power-triage)
** Package changed: ubuntu => linux (Ubuntu)
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https://bugs.launchpad.net/bugs/2085548
Title:
[UBUNTU 24.10] bash printf of floating point value fails on Ubuntu
24.10
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