sigq test from stress-ng will get stuck with Artful kernel

[Po-Hsu Lin]

This issue can be spotted on s390x, ARM64 and AMD64 Artful kernel.

10:02:39 DEBUG| [stdout] sigpending STARTING
10:02:44 DEBUG| [stdout] sigpending RETURNED 0
10:02:44 DEBUG| [stdout] sigpending PASSED
10:02:44 DEBUG| [stdout] sigpipe STARTING
10:02:49 DEBUG| [stdout] sigpipe RETURNED 0
10:02:49 DEBUG| [stdout] sigpipe PASSED
10:02:49 DEBUG| [stdout] sigq STARTING
...

This is the last entry related to stress-ng in syslog of a s390x node:
May 31 10:46:39 s2lp6g004 stress-ng: system: 's2lp6g004' Linux 4.13.0-45-generic #50-Ubuntu SMP Wed May 30 08:21:19 UTC 2018 s390x
May 31 10:46:39 s2lp6g004 stress-ng: memory (MB): total 1805.91, free 1409.97, shared 6.06, buffer 134.56, swap 2001.63, free swap 1890.19
May 31 10:46:39 s2lp6g004 stress-ng: info: [20125] dispatching hogs: 4 sigq

No more stress-ng related message after this.

ubuntu@s2lp6g004:/tmp$ cat stress-9234.log
stress-ng: debug: [20125] 2 processors online, 2 processors configured
stress-ng: info: [20125] dispatching hogs: 4 sigq
stress-ng: debug: [20125] cache allocate: reducing cache level from L3 (too high) to L2
stress-ng: debug: [20125] cache allocate: default cache size: 2048K
stress-ng: debug: [20125] starting stressors
stress-ng: debug: [20126] stress-ng-sigq: started [20126] (instance 0)
stress-ng: debug: [20125] 4 stressors spawned
stress-ng: debug: [20129] stress-ng-sigq: started [20129] (instance 3)
stress-ng: debug: [20128] stress-ng-sigq: started [20128] (instance 2)
stress-ng: debug: [20127] stress-ng-sigq: started [20127] (instance 1)
stress-ng: debug: [20126] stress-ng-sigq: parent sent termination notice
stress-ng: debug: [20130] stress-ng-sigq: child got termination notice

ubuntu@s2lp6g004:/tmp$ ps aux | grep stress-ng
root 5948 0.0 0.0 11456 712 ? S May31 0:00 ./stress-ng -v -t 5 --enosys 4 --ignite-cpu --syslog --verbose --verify --oomable
root 7654 0.0 0.0 11456 712 ? S May31 0:00 ./stress-ng -v -t 5 --enosys 4 --ignite-cpu --syslog --verbose --verify --oomable
root 7728 0.0 0.0 11456 712 ? S May31 0:00 ./stress-ng -v -t 5 --enosys 4 --ignite-cpu --syslog --verbose --verify --oomable
root 7740 0.0 0.0 11456 712 ? S May31 0:00 ./stress-ng -v -t 5 --enosys 4 --ignite-cpu --syslog --verbose --verify --oomable
root 20125 0.0 0.2 13612 5008 ? SL May31 0:00 ./stress-ng -v -t 5 --sigq 4 --ignite-cpu --syslog --verbose --verify --oomable
root 20126 1.0 0.1 13612 1852 ? S May31 12:03 ./stress-ng -v -t 5 --sigq 4 --ignite-cpu --syslog --verbose --verify --oomable
root 20127 1.0 0.1 13612 1852 ? S May31 12:11 ./stress-ng -v -t 5 --sigq 4 --ignite-cpu --syslog --verbose --verify --oomable
root 20128 1.0 0.1 13612 1852 ? S May31 12:04 ./stress-ng -v -t 5 --sigq 4 --ignite-cpu --syslog --verbose --verify --oomable
root 20129 1.0 0.1 13612 1852 ? S May31 12:06 ./stress-ng -v -t 5 --sigq 4 --ignite-cpu --syslog --verbose --verify --oomable
root 20131 0.0 0.0 13612 312 ? S May31 0:00 ./stress-ng -v -t 5 --sigq 4 --ignite-cpu --syslog --verbose --verify --oomable
root 20132 0.0 0.0 13612 312 ? S May31 0:00 ./stress-ng -v -t 5 --sigq 4 --ignite-cpu --syslog --verbose --verify --oomable
root 20133 0.0 0.0 13612 312 ? S May31 0:00 ./stress-ng -v -t 5 --sigq 4 --ignite-cpu --syslog --verbose --verify --oomable

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: linux-image-4.13.0-45-generic 4.13.0-45.50
ProcVersionSignature: Ubuntu 4.13.0-45.50-generic 4.13.16
Uname: Linux 4.13.0-45-generic s390x
NonfreeKernelModules: zfs zunicode zavl zcommon znvpair
AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 2: ls: cannot access '/dev/snd/': No such file or directory
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
ApportVersion: 2.20.7-0ubuntu3.9
Architecture: s390x
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord'
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
CurrentDmesg:

Date: Fri Jun 1 05:29:54 2018
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
Lspci:

Lsusb: Error: command ['lsusb'] failed with exit code 1:
PciMultimedia:

ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=C
 SHELL=/bin/bash
ProcFB: Error: [Errno 2] No such file or directory: '/proc/fb'
ProcKernelCmdLine: root=UUID=d86dc8de-6ac8-4e4b-aba8-92872a209a8c crashkernel=196M
RelatedPackageVersions:
 linux-restricted-modules-4.13.0-45-generic N/A
 linux-backports-modules-4.13.0-45-generic N/A
 linux-firmware 1.169.4
RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1774571

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Po-Hsu Lin (cypressyew)]

Fixed by Colin:
https://github.com/ColinIanKing/stress-ng/commit/481c448adf1b928b99b8221d6edba8ef5ff437f0

[Launchpad Janitor (janitor)]

This bug was fixed in the package stress-ng - 0.09.29-1

---------------
stress-ng (0.09.29-1) unstable; urgency=medium

  * Makefile: bump version
  * Manual: fix spelling mistakes and update date
  * stress-sigfpe: remove need for fp_zero
  * stress-sigfpe: cater for systems without SA_SIGINFO
  * stress-socket: fix warning on unused variable ret
  * stress-sigfpe: remove feenableexcept, it is extraneous
  * stress-sigfpe: fix verify mode, match exception with error code
  * stress-sigfpe: zero siginfo struct
  * stress-apparmor: kill child processes aggressively
  * stress-sigfpe: reset fp exception states to fix math issues
  * stress-apparmor: add more yield point checking
  * Makefile.config: move pthread library to end to fix static linking
    issues
  * Fix typo in manual, --mmapfixedA-ops -> --mmapfixed-ops
  * stress-sigfpe: force more fpe exceptions, exercise handler more
  * stress-socket: use TCP_QUICKACK if available
  * stress-socket: add FIONREAD size peeking
  * stress-userfaultfd: exercise /proc/$pid/fdinfo/$timerfd proc file
  * stress-timerfd: exercise /proc/$pid/fdinfo/$timerfd proc file
  * Rename g_terminate_signum to terminate_signum and make it static
  * Renaming symbols to indicate they are used in process termination
  * Remove some unused old struct typedefs
  * Make some functions static
  * Deconstify some const pointers (ughh)
  * Add deconstifier helper.
  * remove redundant and shadowing variable ret
  * stress-dccp: add missing ,
  * Move the class info into the stressor_info_t for each stressor
  * Rename class_t to class_info_t
  * stress-cpu: fix bitops checksum
  * stress-access: fix build warning on Solaris with %o on mode_t
  * stress-memthrash: restore accidentally removed function
    stress_set_memthrash_method
  * stress-mergesort: fix missing {
  * affinity: fix prototype of set_cpu_affinity
  * stress-cyclic: fix build warning on non-linux systems
  * Point to stress_not_implemented rather than wrapping each time
  * Add stressor_info_t for stress specific info
  * Clean up optarg handling, make it more table driven
  * Revert Add pr_* logging sleepy locks (LP: #1774571)
  * Add pr_* logging sleepy locks

 -- Colin King <email address hidden> Fri, 8 jun 2018 11:30:00 +0100