ubuntu_ltp_kernel_misc:zram01 fails on focal with division by zero error

[Roxana Nicolescu]

Flaky tests seen on kernel-P10d-LPAR00 with 5.4.09-162 focal kernel.

      17305 zram01 1 TINFO: timeout per run is 0h 5m 0s
      17306 tst_supported_fs_types.c:89: TINFO: Kernel supports ext2
      17307 tst_supported_fs_types.c:54: TINFO: mkfs.ext2 does exist
      17308 tst_supported_fs_types.c:89: TINFO: Kernel supports ext3
      17309 tst_supported_fs_types.c:54: TINFO: mkfs.ext3 does exist
      17310 tst_supported_fs_types.c:89: TINFO: Kernel supports ext4
      17311 tst_supported_fs_types.c:54: TINFO: mkfs.ext4 does exist
      17312 tst_supported_fs_types.c:89: TINFO: Kernel supports xfs
      17313 tst_supported_fs_types.c:54: TINFO: mkfs.xfs does exist
      17314 tst_supported_fs_types.c:89: TINFO: Kernel supports btrfs
      17315 tst_supported_fs_types.c:54: TINFO: mkfs.btrfs does exist
      17316 tst_supported_fs_types.c:89: TINFO: Kernel supports vfat
      17317 tst_supported_fs_types.c:54: TINFO: mkfs.vfat does exist
      17318 tst_supported_fs_types.c:89: TINFO: Kernel supports exfat
      17319 tst_supported_fs_types.c:50: TINFO: mkfs.exfat does not exist
      17320 tst_supported_fs_types.c:156: TINFO: Skipping tmpfs as requested by the test
      17321 zram01 1 TINFO: timeout per run is 0h 45m 0s
      17322 zram01 1 TINFO: create '6' zram device(s)
      17323 zram01 1 TPASS: all zram devices (/dev/zram0~5) successfully created
      17324 zram01 1 TCONF: The device attribute max_comp_streams was introduced in kernel 3.15 and deprecated in 4.7
      17325 zram01 2 TINFO: test that we can set compression algorithm
      17326 zram01 2 TINFO: supported algs: lzo lzo-rle lz4 lz4hc 842 zstd
      17327 zram01 2 TINFO: /sys/block/zram0/comp_algorithm = 'lzo'
      17328 zram01 2 TINFO: /sys/block/zram0/comp_algorithm = 'lzo-rle'
      17329 zram01 2 TINFO: /sys/block/zram0/comp_algorithm = 'lz4'
      17330 zram01 2 TINFO: /sys/block/zram0/comp_algorithm = 'lz4hc'
      17331 zram01 2 TINFO: /sys/block/zram0/comp_algorithm = '842'
      17332 zram01 2 TINFO: /sys/block/zram0/comp_algorithm = 'zstd'
      17333 zram01 2 TINFO: /sys/block/zram1/comp_algorithm = 'lzo'
      17334 zram01 2 TINFO: /sys/block/zram1/comp_algorithm = 'lzo-rle'
      17335 zram01 2 TINFO: /sys/block/zram1/comp_algorithm = 'lz4'
      17336 zram01 2 TINFO: /sys/block/zram1/comp_algorithm = 'lz4hc'
      17337 zram01 2 TINFO: /sys/block/zram1/comp_algorithm = '842'
      17338 zram01 2 TINFO: /sys/block/zram1/comp_algorithm = 'zstd'
      17339 zram01 2 TINFO: /sys/block/zram2/comp_algorithm = 'lzo'
      17340 zram01 2 TINFO: /sys/block/zram2/comp_algorithm = 'lzo-rle'
      17341 zram01 2 TINFO: /sys/block/zram2/comp_algorithm = 'lz4'
      17342 zram01 2 TINFO: /sys/block/zram2/comp_algorithm = 'lz4hc'
      17343 zram01 2 TINFO: /sys/block/zram2/comp_algorithm = '842'
      17344 zram01 2 TINFO: /sys/block/zram2/comp_algorithm = 'zstd'
      17345 zram01 2 TINFO: /sys/block/zram3/comp_algorithm = 'lzo'
      17346 zram01 2 TINFO: /sys/block/zram3/comp_algorithm = 'lzo-rle'
      17347 zram01 2 TINFO: /sys/block/zram3/comp_algorithm = 'lz4'
      17348 zram01 2 TINFO: /sys/block/zram3/comp_algorithm = 'lz4hc'
      17349 zram01 2 TINFO: /sys/block/zram3/comp_algorithm = '842'
      17350 zram01 2 TINFO: /sys/block/zram3/comp_algorithm = 'zstd'
      17351 zram01 2 TINFO: /sys/block/zram4/comp_algorithm = 'lzo'
      17352 zram01 2 TINFO: /sys/block/zram4/comp_algorithm = 'lzo-rle'
      17353 zram01 2 TINFO: /sys/block/zram4/comp_algorithm = 'lz4'
      17354 zram01 2 TINFO: /sys/block/zram4/comp_algorithm = 'lz4hc'
      17355 zram01 2 TINFO: /sys/block/zram4/comp_algorithm = '842'
      17356 zram01 2 TINFO: /sys/block/zram4/comp_algorithm = 'zstd'
      17357 zram01 2 TINFO: /sys/block/zram5/comp_algorithm = 'lzo'
      17358 zram01 2 TINFO: /sys/block/zram5/comp_algorithm = 'lzo-rle'
      17359 zram01 2 TINFO: /sys/block/zram5/comp_algorithm = 'lz4'
      17360 zram01 2 TINFO: /sys/block/zram5/comp_algorithm = 'lz4hc'
      17361 zram01 2 TINFO: /sys/block/zram5/comp_algorithm = '842'
      17362 zram01 2 TINFO: /sys/block/zram5/comp_algorithm = 'zstd'
      17363 zram01 2 TPASS: test succeeded
      17364 zram01 3 TINFO: set disk size to zram device(s)
      17365 zram01 3 TINFO: /sys/block/zram0/disksize = '26214400'
      17366 zram01 3 TINFO: /sys/block/zram1/disksize = '26214400'
      17367 zram01 3 TINFO: /sys/block/zram2/disksize = '26214400'
      17368 zram01 3 TINFO: /sys/block/zram3/disksize = '314572800'
      17369 zram01 3 TINFO: /sys/block/zram4/disksize = '402653184'
      17370 zram01 3 TINFO: /sys/block/zram5/disksize = '26214400'
      17371 zram01 3 TPASS: test succeeded
      17372 zram01 4 TINFO: set memory limit to zram device(s)
      17373 zram01 4 TINFO: /sys/block/zram0/mem_limit = '25M'
      17374 zram01 4 TINFO: /sys/block/zram1/mem_limit = '25M'
      17375 zram01 4 TINFO: /sys/block/zram2/mem_limit = '25M'
      17376 zram01 4 TINFO: /sys/block/zram3/mem_limit = '300M'
      17377 zram01 4 TINFO: /sys/block/zram4/mem_limit = '384M'
      17378 zram01 4 TINFO: /sys/block/zram5/mem_limit = '25M'
      17379 zram01 4 TPASS: test succeeded
      17380 zram01 5 TINFO: make ext2 filesystem on /dev/zram0
      17381 zram01 5 TINFO: make ext3 filesystem on /dev/zram1
      17382 zram01 5 TINFO: make ext4 filesystem on /dev/zram2
      17383 zram01 5 TINFO: make xfs filesystem on /dev/zram3
      17384 zram01 5 TINFO: make btrfs filesystem on /dev/zram4
      17385 zram01 5 TINFO: make vfat filesystem on /dev/zram5
      17386 zram01 5 TPASS: zram_makefs succeeded
      17387 zram01 6 TINFO: mount /dev/zram0
      17388 zram01 6 TINFO: mount /dev/zram1
      17389 zram01 6 TINFO: mount /dev/zram2
      17390 zram01 6 TINFO: mount /dev/zram3
      17391 zram01 6 TINFO: mount /dev/zram4
      17392 zram01 6 TINFO: mount /dev/zram5
      17393 zram01 6 TPASS: mount of zram device(s) succeeded
      17394 zram01 7 TINFO: filling zram0 (it can take long time)
      17395 zram01 7 TPASS: zram0 was filled with '24724' KB
      17396 zram01 7 TPASS: compression ratio: 42.92:1
      17397 zram01 7 TINFO: filling zram1 (it can take long time)
      17398 zram01 7 TPASS: zram1 was filled with '20628' KB
      17399 zram01 7 TPASS: compression ratio: 40.28:1
      17400 zram01 7 TINFO: filling zram2 (it can take long time)
      17401 zram01 7 TPASS: zram2 was filled with '20140' KB
      17402 zram01 7 TPASS: compression ratio: 104.89:1
      17403 zram01 7 TINFO: filling zram3 (it can take long time)
      17404 zram01 7 TPASS: zram3 was filled with '284508' KB
      17405 zram01 7 TPASS: compression ratio: 635.06:1
      17406 zram01 7 TINFO: filling zram4 (it can take long time)
      17407 zram01 7 TPASS: zram4 was filled with '330305' KB
      17408 zram01 7 TPASS: compression ratio: 1290.25:1
      17409 zram01 7 TINFO: filling zram5 (it can take long time)
      17410 zram01 7 TPASS: zram5 was filled with '25568' KB
      17411 /opt/ltp/testcases/bin/zram01.sh: 137: arithmetic expression: division by zero: "100 * 1024 * 25568 / 0"
      17412 INFO: ltp-pan reported some tests FAIL
      17413 LTP Version: 20230516
      17414 INFO: Test end time: Mon Aug 14 20:26:35 UTC 2023
      17415 stderr:
      17416 rm: cannot remove '/tmp/ltp-uXeiHk764e/LTP_zram01.vj8A6kAyot/zram0': Device or resource busy
      17417 rm: cannot remove '/tmp/ltp-uXeiHk764e/LTP_zram01.vj8A6kAyot/zram5': Device or resource busy
      17418 rm: cannot remove '/tmp/ltp-uXeiHk764e/LTP_zram01.vj8A6kAyot/zram2': Device or resource busy
      17419 rm: cannot remove '/tmp/ltp-uXeiHk764e/LTP_zram01.vj8A6kAyot/zram3': Device or resource busy
      17420 rm: cannot remove '/tmp/ltp-uXeiHk764e/LTP_zram01.vj8A6kAyot/zram4': Device or resource busy
      17421 rm: cannot remove '/tmp/ltp-uXeiHk764e/LTP_zram01.vj8A6kAyot/zram1': Device or resource busy
      17422 20:26:35 ERROR| child process failed
      17423 20:26:35 DEBUG| Traceback (most recent call last):
      17424 20:26:35 DEBUG| File "/home/ubuntu/autotest/client/parallel.py", line 25, in fork_start
      17425 20:26:35 DEBUG| l()
      17426 20:26:35 DEBUG| File "/home/ubuntu/autotest/client/job.py", line 505, in
      17427 20:26:35 DEBUG| l = lambda: test.runtest(self, url, tag, args, dargs)
      17428 20:26:35 DEBUG| File "/home/ubuntu/autotest/client/test.py", line 125, in runtest
      17429 20:26:35 DEBUG| job.sysinfo.log_after_each_iteration)
      17430 20:26:35 DEBUG| File "/home/ubuntu/autotest/client/shared/test.py", line 913, in runtest
      17431 20:26:35 DEBUG| mytest._exec(args, dargs)
      17432 20:26:35 DEBUG| File "/home/ubuntu/autotest/client/shared/test.py", line 411, in _exec
      17433 20:26:35 DEBUG| _call_test_function(self.execute, *p_args, **p_dargs)
      17434 20:26:35 DEBUG| File "/home/ubuntu/autotest/client/shared/test.py", line 823, in _call_test_function
      17435 20:26:35 DEBUG| return func(*args, **dargs)
      17436 20:26:35 DEBUG| File "/home/ubuntu/autotest/client/shared/test.py", line 291, in execute
      17437 20:26:35 DEBUG| postprocess_profiled_run, args, dargs)
      17438 20:26:35 DEBUG| File "/home/ubuntu/autotest/client/shared/test.py", line 212, in _call_run_once
      17439 20:26:35 DEBUG| self.run_once(*args, **dargs)
      17440 20:26:35 DEBUG| File "/home/ubuntu/autotest/client/tests/ubuntu_ltp_kernel_misc/ubuntu_ltp_kernel_misc.py", line 112, in run_once
      17441 20:26:35 DEBUG| print(utils.system_output(cmd, verbose=False))
      17442 20:26:35 DEBUG| File "/home/ubuntu/autotest/client/shared/utils.py", line 1271, in system_output
      17443 20:26:35 DEBUG| verbose=verbose, args=args).stdout
      17444 20:26:35 DEBUG| File "/home/ubuntu/autotest/client/shared/utils.py", line 918, in run
      17445 20:26:35 DEBUG| "Command returned non-zero exit status")
      17446 20:26:35 DEBUG| CmdError: Command failed, rc=1, Command returned non-zero exit status
      17447 20:26:35 DEBUG| * Command:
      17448 20:26:35 DEBUG| /opt/ltp/runltp -f /tmp/target -q -C /dev/null -l /dev/null -T /dev/null
      17449 20:26:35 DEBUG| Exit status: 1
      17450 20:26:35 DEBUG| Duration: 401.015519142
      17451 20:26:35 DEBUG|