[Bug 2146427] [NEW] stty -F reports bogus baud rate

[Daniel van Vugt]

Public bug reported:

In rust-coreutils on ppc64, I am suddenly getting "speed 15 baud":

$ stty -F /dev/tty
speed 15 baud; line = 0;
-brkint ixon -imaxbel iutf8

where previously it was reporting the same as:

$ gnustty -F /dev/tty
speed 38400 baud; line = 0;
-brkint -imaxbel iutf8

ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: rust-coreutils 0.7.0-0ubuntu1
ProcVersionSignature: Ubuntu 7.0.0-10.10-generic 7.0.0-rc4
Uname: Linux 7.0.0-10-generic ppc64le
.var.log.platform: Error: [Errno 13] Permission denied: '/var/log/platform'
ApportVersion: 2.33.1-0ubuntu5
Architecture: ppc64el
CasperMD5CheckResult: pass
Date: Thu Mar 26 08:50:13 2026
InstallationDate: Installed on 2026-03-26 (0 days ago)
InstallationMedia: Ubuntu-Server 26.04 LTS "Resolute Raccoon" - Daily ppc64el (20260129)
ProcLoadAvg: 1.00 0.62 0.92 1/236 36976
ProcLocks:
 1: FLOCK  ADVISORY  WRITE 36091 00:1a:1844 0 EOF
 2: FLOCK  ADVISORY  WRITE 36856 fc:00:265783 0 EOF
 3: POSIX  ADVISORY  WRITE 36100 00:1a:4874 0 EOF
ProcSwaps:
 Filename				Type		Size		Used		Priority
 /swap.img                               file		4194240		0		-1
ProcVersion: Linux version 7.0.0-10-generic (buildd at bos03-ppc64el-012) (powerpc64le-linux-gnu-gcc (Ubuntu 15.2.0-15ubuntu2) 15.2.0, GNU ld (GNU Binutils for Ubuntu) 2.46) #10-Ubuntu SMP PREEMPT_DYNAMIC Thu Mar 19 10:26:50 UTC 2026
RebootRequiredPkgs: Error: path contained symlinks.
SourcePackage: rust-coreutils
UpgradeStatus: No upgrade log present (probably fresh install)
cpu_cores: Number of cores present = 8
cpu_coreson: Number of cores online = 8
cpu_smt: Error: command ['ppc64_cpu', '--smt'] failed with exit code 255: Machine is not SMT capable

** Affects: rust-coreutils (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug ppc64el regression resolute

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https://bugs.launchpad.net/bugs/2146427

Title:
  stty -F reports bogus baud rate

Status in rust-coreutils package in Ubuntu:
  New

Bug description:
  In rust-coreutils on ppc64, I am suddenly getting "speed 15 baud":

  $ stty -F /dev/tty
  speed 15 baud; line = 0;
  -brkint ixon -imaxbel iutf8

  where previously it was reporting the same as:

  $ gnustty -F /dev/tty
  speed 38400 baud; line = 0;
  -brkint -imaxbel iutf8

  ProblemType: Bug
  DistroRelease: Ubuntu 26.04
  Package: rust-coreutils 0.7.0-0ubuntu1
  ProcVersionSignature: Ubuntu 7.0.0-10.10-generic 7.0.0-rc4
  Uname: Linux 7.0.0-10-generic ppc64le
  .var.log.platform: Error: [Errno 13] Permission denied: '/var/log/platform'
  ApportVersion: 2.33.1-0ubuntu5
  Architecture: ppc64el
  CasperMD5CheckResult: pass
  Date: Thu Mar 26 08:50:13 2026
  InstallationDate: Installed on 2026-03-26 (0 days ago)
  InstallationMedia: Ubuntu-Server 26.04 LTS "Resolute Raccoon" - Daily ppc64el (20260129)
  ProcLoadAvg: 1.00 0.62 0.92 1/236 36976
  ProcLocks:
   1: FLOCK  ADVISORY  WRITE 36091 00:1a:1844 0 EOF
   2: FLOCK  ADVISORY  WRITE 36856 fc:00:265783 0 EOF
   3: POSIX  ADVISORY  WRITE 36100 00:1a:4874 0 EOF
  ProcSwaps:
   Filename				Type		Size		Used		Priority
   /swap.img                               file		4194240		0		-1
  ProcVersion: Linux version 7.0.0-10-generic (buildd at bos03-ppc64el-012) (powerpc64le-linux-gnu-gcc (Ubuntu 15.2.0-15ubuntu2) 15.2.0, GNU ld (GNU Binutils for Ubuntu) 2.46) #10-Ubuntu SMP PREEMPT_DYNAMIC Thu Mar 19 10:26:50 UTC 2026
  RebootRequiredPkgs: Error: path contained symlinks.
  SourcePackage: rust-coreutils
  UpgradeStatus: No upgrade log present (probably fresh install)
  cpu_cores: Number of cores present = 8
  cpu_coreson: Number of cores online = 8
  cpu_smt: Error: command ['ppc64_cpu', '--smt'] failed with exit code 255: Machine is not SMT capable

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