memcg_stat from controllers test suite in LTP failed (hierarchical_memory_limit is 4096, 8192 expected)

[Po-Hsu Lin]

 memcg_stat_test 1 TINFO: Starting test 1
 sh: echo: I/O error
 memcg_stat_test 1 TINFO: set /dev/memcg/memory.use_hierarchy to 0 failed
 memcg_stat_test 1 TINFO: Running memcg_process --shm -k 3 -s 135168
 memcg_stat_test 1 TINFO: Warming up pid: 31352
 memcg_stat_test 1 TINFO: Process is still here after warm up: 31352
 memcg_stat_test 1 TPASS: cache is 135168 as expected
 memcg_stat_test 2 TINFO: Starting test 2
 sh: echo: I/O error
 memcg_stat_test 2 TINFO: set /dev/memcg/memory.use_hierarchy to 0 failed
 memcg_stat_test 2 TINFO: Running memcg_process --mmap-file -s 135168
 memcg_stat_test 2 TINFO: Warming up pid: 31380
 memcg_stat_test 2 TINFO: Process is still here after warm up: 31380
 memcg_stat_test 2 TPASS: mapped_file is 135168 as expected
 memcg_stat_test 3 TINFO: Starting test 3
 sh: echo: I/O error
 memcg_stat_test 3 TINFO: set /dev/memcg/memory.use_hierarchy to 0 failed
 memcg_stat_test 3 TINFO: Running memcg_process --mmap-lock1 -s 4096
 memcg_stat_test 3 TINFO: Warming up pid: 31409
 memcg_stat_test 3 TINFO: Process is still here after warm up: 31409
 memcg_stat_test 3 TPASS: unevictable is 4096 as expected
 memcg_stat_test 4 TINFO: Starting test 4
 sh: echo: I/O error
 memcg_stat_test 4 TINFO: set /dev/memcg/memory.use_hierarchy to 0 failed
 memcg_stat_test 4 TINFO: Running memcg_process --mmap-lock2 -s 4096
 memcg_stat_test 4 TINFO: Warming up pid: 31434
 memcg_stat_test 4 TINFO: Process is still here after warm up: 31434
 memcg_stat_test 4 TPASS: unevictable is 4096 as expected
 memcg_stat_test 5 TINFO: Starting test 5
 sh: echo: I/O error
 memcg_stat_test 5 TINFO: set /dev/memcg/memory.use_hierarchy to 0 failed
 memcg_stat_test 5 TPASS: hierarchical_memory_limit is 4096 as expected
 memcg_stat_test 6 TINFO: Starting test 6
 sh: echo: I/O error
 memcg_stat_test 6 TINFO: set /dev/memcg/memory.use_hierarchy to 0 failed
 sh: echo: I/O error
 memcg_stat_test 6 TFAIL: hierarchical_memory_limit is 4096, 8192 expected
 memcg_stat_test 7 TINFO: Starting test 7
 sh: echo: I/O error
 memcg_stat_test 7 TINFO: set /dev/memcg/memory.use_hierarchy to 0 failed
 memcg_stat_test 7 TCONF: mem+swap is not enabled
 memcg_stat_test 7 TINFO: Starting test 8
 sh: echo: I/O error
 memcg_stat_test 7 TINFO: set /dev/memcg/memory.use_hierarchy to 0 failed
 memcg_stat_test 7 TCONF: mem+swap is not enabled
 tag=memcg_stat stime=1558504742 dur=4 exit=exited stat=33 core=no cu=16 cs=10

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-50-generic 4.15.0-50.54
ProcVersionSignature: User Name 4.15.0-50.54-generic 4.15.18
Uname: Linux 4.15.0-50-generic x86_64
AlsaDevices:
 total 0
 crw-rw---- 1 root audio 116, 1 May 22 02:57 seq
 crw-rw---- 1 root audio 116, 33 May 22 02:57 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
ApportVersion: 2.20.9-0ubuntu7.6
Architecture: amd64
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:
 [14538.862950] cfg80211: Loading compiled-in X.509 certificates for regulatory database
 [14538.874559] cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
Date: Wed May 22 07:17:43 2019
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
Lsusb: Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: QEMU Standard PC (i440FX + PIIX, 1996)
PciMultimedia:

ProcFB: 0 cirrusdrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-50-generic root=UUID=576666e8-9e7f-40ee-934e-f1dce18323e5 ro
RelatedPackageVersions:
 linux-restricted-modules-4.15.0-50-generic N/A
 linux-backports-modules-4.15.0-50-generic N/A
 linux-firmware 1.173.6
RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/01/2014
dmi.bios.vendor: SeaBIOS
dmi.bios.version: Ubuntu-1.8.2-1ubuntu1
dmi.chassis.type: 1
dmi.chassis.vendor: QEMU
dmi.chassis.version: pc-i440fx-xenial
dmi.modalias: dmi:bvnSeaBIOS:bvrUbuntu-1.8.2-1ubuntu1:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-xenial:cvnQEMU:ct1:cvrpc-i440fx-xenial:
dmi.product.name: Standard PC (i440FX + PIIX, 1996)
dmi.product.version: pc-i440fx-xenial
dmi.sys.vendor: QEMU

[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 1829983

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.

[Kelsey Steele (kelsey-steele)]

Spotted on Focal/linux-azure 5.4.0-1029.29

[Kelsey Steele (kelsey-steele)]

Found on Groovy lowlatency 5.8.0-31.33

[Kelsey Steele (kelsey-steele)]

found on bionic/ibm-gt 4.15.0-1084.93

[Krzysztof Kozlowski (krzk)]

On v5.11 kernels the failure looks a little bit different and I think it might be different issue. Since v5.9, the kernel per-group memory is charged towards given group. This failed several tests, e.g. trying to create subgroups.

AWS v5.11, 36-core c4.8xlarge instance:

memcg_stat_test 4 TINFO: Process is still here after warm up: 3210
memcg_stat_test 4 TPASS: unevictable is 135168 as expected
memcg_stat_test 5 TINFO: Test hierarchical_memory_limit with enabling hierarchical accounting
/home/ubuntu/ltp-install/testcases/bin/memcg_stat_test.sh: 47: echo: echo: I/O error
memcg_stat_test 5 TFAIL: hierarchical_memory_limit is 270336, 135168 expected
memcg_stat_test 6 TINFO: Test hierarchical_memory_limit with disabling hierarchical accounting
memcg_stat_test 6 TCONF: Test requires root cgroup memory.use_hierarchy=0
memcg_stat_test 6 TINFO: AppArmor enabled, this may affect test results
memcg_stat_test 6 TINFO: it can be disabled with TST_DISABLE_APPARMOR=1 (requires super/root)
memcg_stat_test 6 TINFO: loaded AppArmor profiles: none

For this (v5.11) issue, sent patches to upstream:
https://lists.linux.it/pipermail/ltp/2021-July/023804.html

[Guilherme G. Piccoli (gpiccoli)]

Observed in B/aws (kernel 4.15), cycle sru-20210621.