zram01 from ubuntu_ltp_kernel_misc failed with: TBROK: "check_read_mem_used_total /sys/block/zram5/mm_stat" timed out

[Po-Hsu Lin]

This new check_read_mem_used_total() is added in recent LTP update [1][2]

Issue found with 5.15.0-94.104~20.04.1 generic-64k openstack ARM64 instance. The test is failing with:
  TBROK: "check_read_mem_used_total /sys/block/zram5/mm_stat" timed out

Test log:
INFO: Test start time: Fri Jan 26 02:53:32 UTC 2024
COMMAND: /opt/ltp/bin/ltp-pan -q -e -S -a 52810 -n 52810 -f /tmp/ltp-Sc89sRvhcZ/alltests -l /dev/null -C /dev/null -T /dev/null
LOG File: /dev/null
FAILED COMMAND File: /dev/null
TCONF COMMAND File: /dev/null
Running tests.......
zram01 1 TINFO: timeout per run is 0h 5m 0s
tst_supported_fs_types.c:89: TINFO: Kernel supports ext2
tst_supported_fs_types.c:54: TINFO: mkfs.ext2 does exist
tst_supported_fs_types.c:89: TINFO: Kernel supports ext3
tst_supported_fs_types.c:54: TINFO: mkfs.ext3 does exist
tst_supported_fs_types.c:89: TINFO: Kernel supports ext4
tst_supported_fs_types.c:54: TINFO: mkfs.ext4 does exist
tst_supported_fs_types.c:89: TINFO: Kernel supports xfs
tst_supported_fs_types.c:54: TINFO: mkfs.xfs does exist
tst_supported_fs_types.c:89: TINFO: Kernel supports btrfs
tst_supported_fs_types.c:54: TINFO: mkfs.btrfs does exist
tst_supported_fs_types.c:89: TINFO: Kernel supports vfat
tst_supported_fs_types.c:54: TINFO: mkfs.vfat does exist
tst_supported_fs_types.c:89: TINFO: Kernel supports exfat
tst_supported_fs_types.c:50: TINFO: mkfs.exfat does not exist
tst_supported_fs_types.c:156: TINFO: Skipping tmpfs as requested by the test
zram01 1 TINFO: timeout per run is 0h 45m 0s
zram01 1 TINFO: create '6' zram device(s)
zram01 1 TPASS: all zram devices (/dev/zram0~5) successfully created
zram01 1 TCONF: The device attribute max_comp_streams was introduced in kernel 3.15 and deprecated in 4.7
zram01 2 TINFO: test that we can set compression algorithm
zram01 2 TINFO: supported algs: lzo lzo-rle lz4 lz4hc 842 zstd
zram01 2 TINFO: /sys/block/zram0/comp_algorithm = 'lzo'
zram01 2 TINFO: /sys/block/zram0/comp_algorithm = 'lzo-rle'
zram01 2 TINFO: /sys/block/zram0/comp_algorithm = 'lz4'
zram01 2 TINFO: /sys/block/zram0/comp_algorithm = 'lz4hc'
zram01 2 TINFO: /sys/block/zram0/comp_algorithm = '842'
zram01 2 TINFO: /sys/block/zram0/comp_algorithm = 'zstd'
zram01 2 TINFO: /sys/block/zram1/comp_algorithm = 'lzo'
zram01 2 TINFO: /sys/block/zram1/comp_algorithm = 'lzo-rle'
zram01 2 TINFO: /sys/block/zram1/comp_algorithm = 'lz4'
zram01 2 TINFO: /sys/block/zram1/comp_algorithm = 'lz4hc'
zram01 2 TINFO: /sys/block/zram1/comp_algorithm = '842'
zram01 2 TINFO: /sys/block/zram1/comp_algorithm = 'zstd'
zram01 2 TINFO: /sys/block/zram2/comp_algorithm = 'lzo'
zram01 2 TINFO: /sys/block/zram2/comp_algorithm = 'lzo-rle'
zram01 2 TINFO: /sys/block/zram2/comp_algorithm = 'lz4'
zram01 2 TINFO: /sys/block/zram2/comp_algorithm = 'lz4hc'
zram01 2 TINFO: /sys/block/zram2/comp_algorithm = '842'
zram01 2 TINFO: /sys/block/zram2/comp_algorithm = 'zstd'
zram01 2 TINFO: /sys/block/zram3/comp_algorithm = 'lzo'
zram01 2 TINFO: /sys/block/zram3/comp_algorithm = 'lzo-rle'
zram01 2 TINFO: /sys/block/zram3/comp_algorithm = 'lz4'
zram01 2 TINFO: /sys/block/zram3/comp_algorithm = 'lz4hc'
zram01 2 TINFO: /sys/block/zram3/comp_algorithm = '842'
zram01 2 TINFO: /sys/block/zram3/comp_algorithm = 'zstd'
zram01 2 TINFO: /sys/block/zram4/comp_algorithm = 'lzo'
zram01 2 TINFO: /sys/block/zram4/comp_algorithm = 'lzo-rle'
zram01 2 TINFO: /sys/block/zram4/comp_algorithm = 'lz4'
zram01 2 TINFO: /sys/block/zram4/comp_algorithm = 'lz4hc'
zram01 2 TINFO: /sys/block/zram4/comp_algorithm = '842'
zram01 2 TINFO: /sys/block/zram4/comp_algorithm = 'zstd'
zram01 2 TINFO: /sys/block/zram5/comp_algorithm = 'lzo'
zram01 2 TINFO: /sys/block/zram5/comp_algorithm = 'lzo-rle'
zram01 2 TINFO: /sys/block/zram5/comp_algorithm = 'lz4'
zram01 2 TINFO: /sys/block/zram5/comp_algorithm = 'lz4hc'
zram01 2 TINFO: /sys/block/zram5/comp_algorithm = '842'
zram01 2 TINFO: /sys/block/zram5/comp_algorithm = 'zstd'
zram01 2 TPASS: test succeeded
zram01 3 TINFO: set disk size to zram device(s)
zram01 3 TINFO: /sys/block/zram0/disksize = '26214400'
zram01 3 TINFO: /sys/block/zram1/disksize = '26214400'
zram01 3 TINFO: /sys/block/zram2/disksize = '26214400'
zram01 3 TINFO: /sys/block/zram3/disksize = '314572800'
zram01 3 TINFO: /sys/block/zram4/disksize = '402653184'
zram01 3 TINFO: /sys/block/zram5/disksize = '26214400'
zram01 3 TPASS: test succeeded
zram01 4 TINFO: set memory limit to zram device(s)
zram01 4 TINFO: /sys/block/zram0/mem_limit = '25M'
zram01 4 TINFO: /sys/block/zram1/mem_limit = '25M'
zram01 4 TINFO: /sys/block/zram2/mem_limit = '25M'
zram01 4 TINFO: /sys/block/zram3/mem_limit = '300M'
zram01 4 TINFO: /sys/block/zram4/mem_limit = '384M'
zram01 4 TINFO: /sys/block/zram5/mem_limit = '25M'
zram01 4 TPASS: test succeeded
zram01 5 TINFO: make ext2 filesystem on /dev/zram0
zram01 5 TINFO: make ext3 filesystem on /dev/zram1
zram01 5 TINFO: make ext4 filesystem on /dev/zram2
zram01 5 TINFO: make xfs filesystem on /dev/zram3
zram01 5 TINFO: make btrfs filesystem on /dev/zram4
zram01 5 TINFO: make vfat filesystem on /dev/zram5
zram01 5 TPASS: zram_makefs succeeded
zram01 6 TINFO: mount /dev/zram0
zram01 6 TINFO: mount /dev/zram1
zram01 6 TINFO: mount /dev/zram2
zram01 6 TINFO: mount /dev/zram3
zram01 6 TINFO: mount /dev/zram4
zram01 6 TINFO: mount /dev/zram5
zram01 6 TPASS: mount of zram device(s) succeeded
zram01 7 TINFO: filling zram0 (it can take long time)
zram01 7 TPASS: zram0 was filled with '24724' KB
zram01 7 TINFO: /sys/block/zram0/mm_stat
20447232 6553 655360 26214400 655360 305 0 0 0
zram01 7 TINFO: mem_used_total: 655360
zram01 7 TPASS: compression ratio: 38.63:1
zram01 7 TINFO: filling zram1 (it can take long time)
zram01 7 TPASS: zram1 was filled with '20628' KB
zram01 7 TINFO: /sys/block/zram1/mm_stat
25493504 15275 327680 26214400 524288 385 0 0 0
zram01 7 TINFO: mem_used_total: 327680
zram01 7 TPASS: compression ratio: 64.46:1
zram01 7 TINFO: filling zram2 (it can take long time)
zram01 7 TPASS: zram2 was filled with '20140' KB
zram01 7 TINFO: /sys/block/zram2/mm_stat
25296896 1398 262144 26214400 262144 382 0 0 0
zram01 7 TINFO: mem_used_total: 262144
zram01 7 TPASS: compression ratio: 78.67:1
zram01 7 TINFO: filling zram3 (it can take long time)
zram01 7 TPASS: zram3 was filled with '284508' KB
zram01 7 TINFO: /sys/block/zram3/mm_stat
296878080 14438 458752 314572800 589824 4493 0 0 0
zram01 7 TINFO: mem_used_total: 458752
zram01 7 TPASS: compression ratio: 635.06:1
zram01 7 TINFO: filling zram4 (it can take long time)
zram01 7 TPASS: zram4 was filled with '330368' KB
zram01 7 TINFO: /sys/block/zram4/mm_stat
343015424 12093 262144 402653184 262144 5190 0 0 0
zram01 7 TINFO: mem_used_total: 262144
zram01 7 TPASS: compression ratio: 1290.50:1
zram01 7 TINFO: filling zram5 (it can take long time)
zram01 7 TPASS: zram5 was filled with '25568' KB
zram01 7 TINFO: /sys/block/zram5/mm_stat
11403264 0 0 26214400 196608 174 0 0 0
zram01 7 TINFO: /sys/block/zram5/mm_stat
11403264 0 0 26214400 196608 174 0 0 0
zram01 7 TINFO: /sys/block/zram5/mm_stat
11403264 0 0 26214400 196608 174 0 0 0
zram01 7 TINFO: /sys/block/zram5/mm_stat
11403264 0 0 26214400 196608 174 0 0 0
zram01 7 TINFO: /sys/block/zram5/mm_stat
11403264 0 0 26214400 196608 174 0 0 0
zram01 7 TINFO: /sys/block/zram5/mm_stat
11403264 0 0 26214400 196608 174 0 0 0
zram01 7 TINFO: /sys/block/zram5/mm_stat
11403264 0 0 26214400 196608 174 0 0 0
zram01 7 TINFO: /sys/block/zram5/mm_stat
11403264 0 0 26214400 196608 174 0 0 0
zram01 7 TINFO: /sys/block/zram5/mm_stat
11403264 0 0 26214400 196608 174 0 0 0
zram01 7 TINFO: /sys/block/zram5/mm_stat
11403264 0 0 26214400 196608 174 0 0 0
zram01 7 TINFO: /sys/block/zram5/mm_stat
11403264 0 0 26214400 196608 174 0 0 0
zram01 7 TINFO: /sys/block/zram5/mm_stat
11403264 0 0 26214400 196608 174 0 0 0
zram01 7 TINFO: /sys/block/zram5/mm_stat
11403264 0 0 26214400 196608 174 0 0 0
zram01 7 TINFO: /sys/block/zram5/mm_stat
11403264 0 0 26214400 196608 174 0 0 0
zram01 7 TINFO: /sys/block/zram5/mm_stat
11403264 0 0 26214400 196608 174 0 0 0
zram01 7 TINFO: /sys/block/zram5/mm_stat
11403264 0 0 26214400 196608 174 0 0 0
zram01 7 TINFO: /sys/block/zram5/mm_stat
11403264 0 0 26214400 196608 174 0 0 0
zram01 7 TINFO: /sys/block/zram5/mm_stat
11403264 0 0 26214400 196608 174 0 0 0
zram01 7 TINFO: /sys/block/zram5/mm_stat
11403264 0 0 26214400 196608 174 0 0 0
zram01 7 TINFO: /sys/block/zram5/mm_stat
11403264 0 0 26214400 196608 174 0 0 0
zram01 7 TINFO: /sys/block/zram5/mm_stat
11403264 0 0 26214400 196608 174 0 0 0
zram01 7 TBROK: "check_read_mem_used_total /sys/block/zram5/mm_stat" timed out
zram01 7 TINFO: AppArmor enabled, this may affect test results
zram01 7 TINFO: it can be disabled with TST_DISABLE_APPARMOR=1 (requires super/root)
zram01 7 TINFO: loaded AppArmor profiles: none

Summary:
passed 17
failed 0
broken 1
skipped 1
warnings 0
INFO: ltp-pan reported some tests FAIL
LTP Version: 20230929
INFO: Test end time: Fri Jan 26 02:59:10 UTC 2024

[1] https://lists.ubuntu.com/archives/kernel-team/2023-December/147590.html
[2]
https://github.com/linux-test-project/ltp/commit/f045fd1de6420cc6d7db2bda0cd86fb56ff5b1c1