Public bug reported:
Issue found on 5.4.0-1013.13
The ftrace in ubuntu_kernel_selftests failed on the second test:
# === Ftrace unit tests ===
# [1] Basic trace file check [PASS]
# [2] Basic test for tracers
(System hang here)
Syslog:
kernel: [ 2234.408225] in mmio_trace_init
kernel: [ 2234.988256] mmiotrace: Disabling non-boot CPUs...
kernel: [ 2235.028451] mmiotrace: Error taking CPU1 down: -16
kernel: [ 2235.052564] mmiotrace: Error taking CPU2 down: -16
kernel: [ 2235.076593] mmiotrace: Error taking CPU3 down: -16
kernel: [ 2235.096576] mmiotrace: Error taking CPU4 down: -16
kernel: [ 2235.116487] mmiotrace: Error taking CPU5 down: -16
kernel: [ 2235.132446] mmiotrace: Error taking CPU6 down: -16
kernel: [ 2235.152488] mmiotrace: Error taking CPU7 down: -16
kernel: [ 2235.172526] mmiotrace: Error taking CPU8 down: -16
kernel: [ 2235.192486] mmiotrace: Error taking CPU9 down: -16
kernel: [ 2235.212455] mmiotrace: Error taking CPU10 down: -16
kernel: [ 2235.233020] mmiotrace: Error taking CPU11 down: -16
kernel: [ 2235.256355] mmiotrace: Error taking CPU12 down: -16
kernel: [ 2235.272473] mmiotrace: Error taking CPU13 down: -16
kernel: [ 2235.292393] mmiotrace: Error taking CPU14 down: -16
kernel: [ 2235.312426] mmiotrace: Error taking CPU15 down: -16
kernel: [ 2235.344407] mmiotrace: Error taking CPU16 down: -16
kernel: [ 2235.380494] mmiotrace: Error taking CPU17 down: -16
kernel: [ 2235.400319] mmiotrace: Error taking CPU18 down: -16
kernel: [ 2235.432631] mmiotrace: Error taking CPU19 down: -16
kernel: [ 2235.456453] mmiotrace: Error taking CPU20 down: -16
kernel: [ 2235.480432] mmiotrace: Error taking CPU21 down: -16
kernel: [ 2235.496501] mmiotrace: Error taking CPU22 down: -16
kernel: [ 2235.516442] mmiotrace: Error taking CPU23 down: -16
kernel: [ 2235.536394] mmiotrace: Error taking CPU24 down: -16
kernel: [ 2235.556489] mmiotrace: Error taking CPU25 down: -16
kernel: [ 2235.573759] smpboot: CPU 26 is now offline
kernel: [ 2235.575071] mmiotrace: CPU26 is down.
kernel: [ 2235.585643] smpboot: CPU 27 is now offline
kernel: [ 2235.586699] mmiotrace: CPU27 is down.
kernel: [ 2235.609679] smpboot: CPU 28 is now offline
kernel: [ 2235.610788] mmiotrace: CPU28 is down.
kernel: [ 2235.633530] smpboot: CPU 29 is now offline
kernel: [ 2235.634511] mmiotrace: CPU29 is down.
kernel: [ 2235.653652] smpboot: CPU 30 is now offline
kernel: [ 2235.655415] mmiotrace: CPU30 is down.
kernel: [ 2235.678126] smpboot: CPU 31 is now offline
kernel: [ 2235.679061] mmiotrace: CPU31 is down.
kernel: [ 2235.679062] mmiotrace: multiple CPUs still online, may miss events.
kernel: [ 2235.679063] mmiotrace: enabled.
kernel: [ 2235.679128] in mmio_trace_reset
kernel: [ 2235.696163] mmiotrace: Re-enabling CPUs...
kernel: [ 2235.732157] mmiotrace: enabled CPU1.
kernel: [ 2235.772207] mmiotrace: enabled CPU2.
kernel: [ 2235.812216] mmiotrace: enabled CPU3.
kernel: [ 2235.844220] mmiotrace: enabled CPU4.
kernel: [ 2235.876211] mmiotrace: enabled CPU5.
kernel: [ 2235.916159] mmiotrace: enabled CPU6.
kernel: [ 2235.956214] mmiotrace: enabled CPU7.
kernel: [ 2235.988145] mmiotrace: enabled CPU8.
kernel: [ 2236.020214] mmiotrace: enabled CPU9.
kernel: [ 2236.060207] mmiotrace: enabled CPU10.
kernel: [ 2236.096208] mmiotrace: enabled CPU11.
kernel: [ 2236.128205] mmiotrace: enabled CPU12.
/usr/sbin/irqbalance: WARNING, didn't collect load info for all cpus, balancing
is broken
kernel: [ 2236.168204] mmiotrace: enabled CPU13.
kernel: [ 2236.200206] mmiotrace: enabled CPU14.
kernel: [ 2236.232207] mmiotrace: enabled CPU15.
kernel: [ 2236.264224] mmiotrace: enabled CPU16.
kernel: [ 2236.300207] mmiotrace: enabled CPU17.
kernel: [ 2236.332210] mmiotrace: enabled CPU18.
kernel: [ 2236.372224] mmiotrace: enabled CPU19.
kernel: [ 2236.404147] mmiotrace: enabled CPU20.
kernel: [ 2236.452153] mmiotrace: enabled CPU21.
kernel: [ 2236.492152] mmiotrace: enabled CPU22.
kernel: [ 2236.524153] mmiotrace: enabled CPU23.
kernel: [ 2236.564211] mmiotrace: enabled CPU24.
kernel: [ 2236.612204] mmiotrace: enabled CPU25.
kernel: [ 2236.644353] smpboot: Booting Node 0 Processor 26 APIC 0x1a
kernel: [ 2236.645769] mmiotrace: enabled CPU26.
kernel: [ 2236.684537] smpboot: Booting Node 0 Processor 27 APIC 0x1b
kernel: [ 2236.685751] mmiotrace: enabled CPU27.
kernel: [ 2236.724284] smpboot: Booting Node 0 Processor 28 APIC 0x1c
kernel: [ 2236.725508] mmiotrace: enabled CPU28.
kernel: [ 2236.772271] smpboot: Booting Node 0 Processor 29 APIC 0x1d
kernel: [ 2236.773532] mmiotrace: enabled CPU29.
kernel: [ 2236.816285] smpboot: Booting Node 0 Processor 30 APIC 0x1e
kernel: [ 2236.817403] mmiotrace: enabled CPU30.
kernel: [ 2236.856265] smpboot: Booting Node 0 Processor 31 APIC 0x1f
kernel: [ 2236.857716] mmiotrace: enabled CPU31.
kernel: [ 2236.868235] mmiotrace: disabled.
(System hang here)
This is not a regression as it can be found on 5.4.0-1012.12 as well.
** Affects: ubuntu-kernel-tests
Importance: Undecided
Status: New
** Affects: linux-azure-5.4 (Ubuntu)
Importance: Undecided
Status: New
** Tags: 5.4 azure focal kqa-blocker sru-20200518 ubuntu-ftrace-smoke-test
ubuntu-kernel-selftests
** Also affects: linux-azure-5.4 (Ubuntu)
Importance: Undecided
Status: New
** Tags added: 5.4 azure focal kqa-blocker sru-20200518 ubuntu-ftrace-
smoke-test ubuntu-kernel-selftests
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https://bugs.launchpad.net/bugs/1882669
Title:
Focal Azure crash with ftracetest in ubuntu_kernel_selftests and
ubuntu_ftrace_smoke_test
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