ptrace-tm-spd-gpr in powerpc/ptrace from ubuntu_kerenl_selftests failed on Bionic P8

Bug #1813127 reported by Po-Hsu Lin on 2019-01-24
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Po-Hsu Lin
linux (Ubuntu)
Po-Hsu Lin

Bug Description

== Justification ==
ptrace-tm-spd-gpr in powerpc/ptrace will fail with Power8 on Bionic:
$ sudo ./ptrace-tm-spd-gpr
test: ptrace_tm_spd_gpr
tags: git_version:c186097-dirty
!! killing ptrace_tm_spd_gpr
!! child died by signal 15
failure: ptrace_tm_spd_gpr

This is due to a segmentation fault that happens on the child process
prior to setting cptr[2] = 1. This causes the parent process to wait
forever at 'while (!pptr[2])' and the test to be killed by the test
harness framework by timeout.

== Fix ==
48dc0ef (selftests/powerpc: Fix ptrace tm failure)
This patch can be cherry-picked for Bionic.

== Test ==
After the patch, the test will pass with:
$ sudo ./ptrace-tm-spd-gpr
test: ptrace_tm_spd_gpr
tags: git_version:c186097-dirty
success: ptrace_tm_spd_gpr

== Regression potential ==
None, change for the testing tool only.

This issue only exist in Bionic P8:
$ sudo ./ptrace-tm-spd-gpr
test: ptrace_tm_spd_gpr
tags: git_version:c186097-dirty
!! killing ptrace_tm_spd_gpr
!! child died by signal 15
failure: ptrace_tm_spd_gpr

Result on P9:
$ sudo ./ptrace-tm-spd-gpr
test: ptrace_tm_spd_gpr
tags: git_version:unknown
[SKIP] Test skipped on line 125
skip: ptrace_tm_spd_gpr

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-43-generic 4.15.0-43.46
ProcVersionSignature: Ubuntu 4.15.0-43.46-generic 4.15.18
Uname: Linux 4.15.0-43-generic ppc64le
 total 0
 crw-rw---- 1 root audio 116, 1 Jan 24 06:57 seq
 crw-rw---- 1 root audio 116, 33 Jan 24 06:57 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: ppc64el
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CurrentDmesg: [ 3531.661373] ptrace-tm-spd-g[22437]: unhandled signal 11 at 0000000000000000 nip 00000f7428473330 lr 00000f742847317c code 1
Date: Thu Jan 24 07:59:27 2019
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
 Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub


ProcKernelCmdLine: root=/dev/mapper/mpath0-part2 ro console=hvc0
ProcLoadAvg: 0.32 0.53 0.33 1/1478 23438
 Filename Type Size Used Priority
 /swap.img file 8388544 0 -2
ProcVersion: Linux version 4.15.0-43-generic (buildd@bos02-ppc64el-020) (gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)) #46-Ubuntu SMP Thu Dec 6 14:43:28 UTC 2018
 linux-restricted-modules-4.15.0-43-generic N/A
 linux-backports-modules-4.15.0-43-generic N/A
 linux-firmware 1.173.3
RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
VarLogDump_list: total 0
cpu_cores: Number of cores present = 20
cpu_coreson: Number of cores online = 20
cpu_dscr: DSCR is 0
 min: 3.694 GHz (cpu 159)
 max: 3.694 GHz (cpu 4)
 avg: 3.694 GHz
 Could not retrieve current diagnostics mode,
 No kernel interface to firmware
cpu_smt: SMT=8

Po-Hsu Lin (cypressyew) wrote :
Changed in linux (Ubuntu):
assignee: nobody → Po-Hsu Lin (cypressyew)
status: New → In Progress
Po-Hsu Lin (cypressyew) on 2019-01-24
description: updated
Changed in ubuntu-kernel-tests:
assignee: nobody → Po-Hsu Lin (cypressyew)
status: New → In Progress
Stefan Bader (smb) on 2019-01-30
Changed in linux (Ubuntu Bionic):
importance: Undecided → Medium
status: New → In Progress
Changed in linux (Ubuntu):
status: In Progress → Invalid
Changed in linux (Ubuntu Bionic):
status: In Progress → Fix Committed
Brad Figg (brad-figg) wrote :

This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-bionic' to 'verification-done-bionic'. If the problem still exists, change the tag 'verification-needed-bionic' to 'verification-failed-bionic'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See for documentation how to enable and use -proposed. Thank you!

tags: added: verification-needed-bionic
Po-Hsu Lin (cypressyew) wrote :

 selftests: ptrace-tm-spd-gpr
 test: ptrace_tm_spd_gpr
 tags: git_version:unknown
 success: ptrace_tm_spd_gpr
 ok 1..3 selftests: ptrace-tm-spd-gpr [PASS]

Passed with Bionic 4.15.0-46.49 on PPC

tags: added: verification-done-bionic
removed: verification-needed-bionic
Changed in ubuntu-kernel-tests:
status: In Progress → Fix Committed
Launchpad Janitor (janitor) wrote :
Download full text (11.4 KiB)

This bug was fixed in the package linux - 4.15.0-46.49

linux (4.15.0-46.49) bionic; urgency=medium

  * linux: 4.15.0-46.49 -proposed tracker (LP: #1814726)

  * mprotect fails on ext4 with dax (LP: #1799237)
    - x86/speculation/l1tf: Exempt zeroed PTEs from inversion

  * kernel BUG at /build/linux-vxxS7y/linux-4.15.0/mm/slub.c:296! (LP: #1812086)
    - iscsi target: fix session creation failure handling
    - scsi: iscsi: target: Set conn->sess to NULL when iscsi_login_set_conn_values
    - scsi: iscsi: target: Fix conn_ops double free

  * user_copy in user from ubuntu_kernel_selftests failed on KVM kernel
    (LP: #1812198)
    - selftests: user: return Kselftest Skip code for skipped tests
    - selftests: kselftest: change KSFT_SKIP=4 instead of KSFT_PASS
    - selftests: kselftest: Remove outdated comment

  * RTL8822BE WiFi Disabled in Kernel 4.18.0-12 (LP: #1806472)
    - SAUCE: staging: rtlwifi: allow RTLWIFI_DEBUG_ST to be disabled
    - SAUCE: Add r8822be to signature inclusion list

  * kernel oops in bcache module (LP: #1793901)
    - SAUCE: bcache: never writeback a discard operation

  * CVE-2018-18397
    - userfaultfd: use ENOENT instead of EFAULT if the atomic copy user fails
    - userfaultfd: shmem: allocate anonymous memory for MAP_PRIVATE shmem
    - userfaultfd: shmem/hugetlbfs: only allow to register VM_MAYWRITE vmas
    - userfaultfd: shmem: add i_size checks
    - userfaultfd: shmem: UFFDIO_COPY: set the page dirty if VM_WRITE is not set

  * Ignore "incomplete report" from Elan touchpanels (LP: #1813733)
    - HID: i2c-hid: Ignore input report if there's no data present on Elan

  * Vsock connect fails with ENODEV for large CID (LP: #1813934)
    - vhost/vsock: fix vhost vsock cid hashing inconsistent

  * SRU: Fix thinkpad 11e 3rd boot hang (LP: #1804604)
    - ACPI / LPSS: Force LPSS quirks on boot

  * Bionic update: upstream stable patchset 2019-01-17 (LP: #1812229)
    - scsi: sd_zbc: Fix variable type and bogus comment
    - KVM/Eventfd: Avoid crash when assign and deassign specific eventfd in
    - x86/apm: Don't access __preempt_count with zeroed fs
    - x86/events/intel/ds: Fix bts_interrupt_threshold alignment
    - x86/MCE: Remove min interval polling limitation
    - fat: fix memory allocation failure handling of match_strdup()
    - ALSA: hda/realtek - Add Panasonic CF-SZ6 headset jack quirk
    - ARCv2: [plat-hsdk]: Save accl reg pair by default
    - ARC: configs: Remove CONFIG_INITRAMFS_SOURCE from defconfigs
    - ARC: mm: allow mprotect to make stack mappings executable
    - mm: memcg: fix use after free in mem_cgroup_iter()
    - mm/huge_memory.c: fix data loss when splitting a file pmd
    - cpufreq: intel_pstate: Register when ACPI PCCH is present
    - vfio/pci: Fix potential Spectre v1
    - stop_machine: Disable preemption when waking two stopper threads
    - drm/i915: Fix hotplug irq ack on i965/g4x
    - drm/nouveau: Use drm_connector_list_iter_* for iterating connectors
    - drm/nouveau: Avoid looping through fake MST connectors
    - gen_stats: Fix netl...

Changed in linux (Ubuntu Bionic):
status: Fix Committed → Fix Released
Po-Hsu Lin (cypressyew) on 2019-09-16
tags: added: ubuntu-kernel-selftests
Po-Hsu Lin (cypressyew) on 2019-09-19
Changed in ubuntu-kernel-tests:
status: Fix Committed → Fix Released
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