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[Bug 1978438] Re: ubuntu_lttng_smoke_test failed with module build timeout on AWS J-5.15 ARM64k instance a1.medium

To: canonical-ubuntu-qa@xxxxxxxxxxxxxxxxxxx
From: Sean Feole <1978438@xxxxxxxxxxxxxxxxxx>
Date: Mon, 10 Feb 2025 21:25:26 -0000
Reply-to: Bug 1978438 <1978438@xxxxxxxxxxxxxxxxxx>
Sender: noreply@xxxxxxxxxxxxx
Per upcoming PR, a1.medium is now replaced by a1.xlarge, This bug will
be invalidated now that we are testing on an instance type with enough
resources.

I have ensured that ubuntu_lttng_smoke_test runs on noble 6.8.0-1021-aws

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https://bugs.launchpad.net/bugs/1978438

Title:
  ubuntu_lttng_smoke_test failed with module build timeout on AWS J-5.15
  ARM64k instance a1.medium

Status in ubuntu-kernel-tests:
  Confirmed

Bug description:
  Issue found on Jammy 5.15.0-36.37 ARM64k with AWS instance a1.medium
  (passed with ARM64 a1.medium)

  This is not a regression, as this issue can be found since
  5.15.0-28.29

  The reason is that the lttng module will failed to build on this
  instance:

  $ time sudo apt install lttng-modules-dkms
  Reading package lists... Done
  Building dependency tree... Done
  Reading state information... Done
  The following additional packages will be installed:
    dkms lttng-tools
  Suggested packages:
    menu
  The following NEW packages will be installed:
    dkms lttng-modules-dkms lttng-tools
  0 upgraded, 3 newly installed, 0 to remove and 14 not upgraded.
  Need to get 0 B/1471 kB of archives.
  After this operation, 7338 kB of additional disk space will be used.
  Do you want to continue? [Y/n]
  Selecting previously unselected package dkms.
  (Reading database ... 113883 files and directories currently installed.)
  Preparing to unpack .../dkms_2.8.7-2ubuntu2_all.deb ...
  Unpacking dkms (2.8.7-2ubuntu2) ...
  Selecting previously unselected package lttng-tools.
  Preparing to unpack .../lttng-tools_2.13.4-1build1_arm64.deb ...
  Unpacking lttng-tools (2.13.4-1build1) ...
  Selecting previously unselected package lttng-modules-dkms.
  Preparing to unpack .../lttng-modules-dkms_2.13.1-1_all.deb ...
  Unpacking lttng-modules-dkms (2.13.1-1) ...
  Setting up dkms (2.8.7-2ubuntu2) ...
  Setting up lttng-modules-dkms (2.13.1-1) ...
  Loading new lttng-modules-2.13.1 DKMS files...
  Building for 5.15.0-37-generic-64k 5.15.0-1009-aws
  Building initial module for 5.15.0-37-generic-64k
  ERROR: Cannot create report: [Errno 17] File exists: '/var/crash/lttng-modules-dkms.0.crash'
  Error! Bad return status for module build on kernel: 5.15.0-37-generic-64k (aarch64)
  Consult /var/lib/dkms/lttng-modules/2.13.1/build/make.log for more information.
  dpkg: error processing package lttng-modules-dkms (--configure):
   installed lttng-modules-dkms package post-installation script subprocess returned error exit status 10
  Setting up lttng-tools (2.13.4-1build1) ...
  Processing triggers for man-db (2.10.2-1) ...
  Errors were encountered while processing:
   lttng-modules-dkms
  needrestart is being skipped since dpkg has failed
  E: Sub-process /usr/bin/dpkg returned an error code (1)

  real	27m36.381s
  user	0m0.004s
  sys	0m0.018s

  DKMS make.log for lttng-modules-2.13.1 for kernel 5.15.0-37-generic-64k (aarch64)
  Mon Jun 13 03:32:05 UTC 2022
  make: Entering directory '/usr/src/linux-headers-5.15.0-37-generic-64k'
  /var/lib/dkms/lttng-modules/2.13.1/build/src/probes/Kbuild:166: Files ./fs/btrfs/*.h not found. Probe "btrfs" is disabled. Use full kernel source tree to enable it.
  /var/lib/dkms/lttng-modules/2.13.1/build/src/probes/Kbuild:177: Files ./fs/ext4/*.h not found. Probe "ext4" is disabled. Use full kernel source tree to enable it.
  /var/lib/dkms/lttng-modules/2.13.1/build/src/probes/Kbuild:208: File ./drivers/base/regmap/trace.h not found. Probe "regmap" is disabled. Need Linux 4.1+ kernel source tree to enable it.
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/probes/lttng-probe-sched.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/probes/lttng-probe-irq.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/probes/lttng-probe-timer.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/probes/lttng-probe-kmem.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/probes/lttng-probe-module.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/probes/lttng-probe-power.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/probes/lttng-probe-statedump.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/probes/lttng-probe-9p.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/probes/lttng-probe-i2c.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/probes/lttng-probe-kvm.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/probes/lttng-probe-signal.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/probes/lttng-probe-block.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/probes/lttng-probe-napi.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/probes/lttng-probe-skb.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/probes/lttng-probe-net.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/probes/lttng-probe-sock.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/probes/lttng-probe-udp.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/probes/lttng-probe-asoc.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/probes/lttng-probe-gpio.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/probes/lttng-probe-jbd2.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/probes/lttng-probe-regulator.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/probes/lttng-probe-scsi.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/probes/lttng-probe-vmscan.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/probes/lttng-probe-compaction.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/probes/lttng-probe-printk.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/probes/lttng-probe-random.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/probes/lttng-probe-rcu.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/probes/lttng-probe-sunrpc.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/probes/lttng-probe-v4l2.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/probes/lttng-probe-workqueue.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/probes/lttng-probe-writeback.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/probes/lttng-kprobes.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/probes/lttng-uprobes.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/probes/lttng-kretprobes.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lib/ringbuffer/ring_buffer_backend.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lib/ringbuffer/ring_buffer_frontend.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lib/ringbuffer/ring_buffer_iterator.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lib/ringbuffer/ring_buffer_vfs.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lib/ringbuffer/ring_buffer_splice.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lib/ringbuffer/ring_buffer_mmap.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lib/prio_heap/lttng_prio_heap.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lib/../wrapper/splice.o
    LD [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lib/lttng-lib-ring-buffer.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lib/counter/counter.o
    LD [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lib/lttng-counter.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/tests/probes/lttng-test.o
    LD [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/tests/lttng-test.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/tests/clock-plugin/lttng-clock-plugin-test.o
    LD [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/tests/lttng-clock-plugin-test.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-ring-buffer-client-discard.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-ring-buffer-client-overwrite.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-ring-buffer-metadata-client.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-ring-buffer-client-mmap-discard.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-ring-buffer-client-mmap-overwrite.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-ring-buffer-metadata-mmap-client.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-ring-buffer-event-notifier-client.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-counter-client-percpu-32-modular.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-counter-client-percpu-64-modular.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-clock.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lib/msgpack/msgpack.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-events.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-abi.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-string-utils.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-probes.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-context.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-context-pid.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-context-procname.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-context-prio.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-context-nice.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-context-vpid.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-context-tid.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-context-vtid.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-context-ppid.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-context-vppid.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-context-cpu-id.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-context-uid.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-context-euid.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-context-suid.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-context-gid.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-context-egid.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-context-sgid.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-context-vuid.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-context-veuid.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-context-vsuid.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-context-vgid.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-context-vegid.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-context-vsgid.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-context-interruptible.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-context-need-reschedule.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-calibrate.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-context-hostname.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-context-callstack.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/probes/lttng.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-tracker-id.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-bytecode.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-bytecode-interpreter.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-bytecode-specialize.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-bytecode-validator.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/probes/lttng-probe-user.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-tp-mempool.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-event-notifier-notification.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-syscalls.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-syscalls-entry-table.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-syscalls-entry-compat-table.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-syscalls-exit-table.o
    CC [M]  /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-syscalls-exit-compat-table.o
  gcc: fatal error: Killed signal terminated program cc1
  compilation terminated.
  make[2]: *** [scripts/Makefile.build:285: /var/lib/dkms/lttng-modules/2.13.1/build/src/lttng-syscalls-exit-compat-table.o] Error 1
  make[1]: *** [scripts/Makefile.build:548: /var/lib/dkms/lttng-modules/2.13.1/build/src] Error 2
  make: *** [Makefile:1875: /var/lib/dkms/lttng-modules/2.13.1/build] Error 2
  make: Leaving directory '/usr/src/linux-headers-5.15.0-37-generic-64k'

  At the very beginning I thought it's because the ram is too small on this instance:
  $ free -h
                 total        used        free      shared  buff/cache   available
  Mem:           1.8Gi       425Mi       1.0Gi        15Mi       347Mi       1.1Gi
  Swap:             0B          0B          0B

  But if you install the generic arm64 kernel on this node and remove
  the generic-64k one, the module can be built in about 14 minutes (for
  the generic and aws kernel, with just the generic kernel it will be
  just 7 minutes)

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