[Bug 2086920] Re: [SRU] fio 3.36-1build2 in Ubuntu Noble crashes on riscv64

[Simon Chopin]

** Changed in: fio (Ubuntu Noble)
       Status: New => In Progress

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Title:
  [SRU] fio 3.36-1build2 in Ubuntu Noble crashes on riscv64

Status in fio package in Ubuntu:
  Fix Released
Status in fio source package in Noble:
  In Progress

Bug description:
  [ Impact ]

  fio 3.36-1build2 in Ubuntu Noble crashes on riscv64

  $ fio -name test --size=1M --rw=read --bs=4k
  test: (g=0): rw=read, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T) 4096B-4096B, ioengine=psync, iodepth=1
  fio-3.36
  Illegal instruction (core dumped)

  apport-retrace --gdb shows that the crash occurs when executing

      rdcycle a3

  This is the call stack:

  #4  0x0000555e549d3a74 in fio_time_init () at time.c:149
  #3  0x0000555e549c1dc0 in fio_clock_init () at gettime.c:416
  #2  0x0000555e549c106e in calibrate_cpu_clock () at gettime.c:268
  #1  get_cycles_per_msec () at gettime.c:246
  #0  get_cpu_clock () at arch/arch-riscv64.h:19

  A patch resolving the issue is available at
  https://github.com/axboe/fio/commit/577b85ec41b5560a81a4fb09d1ec7760bcacc49f

  ProblemType: Bug
  DistroRelease: Ubuntu 24.04
  Package: fio 3.36-1build2
  Uname: Linux 6.6.21-5-premier riscv64
  ApportVersion: 2.28.1-0ubuntu3.1
  Architecture: riscv64
  CasperMD5CheckResult: unknown
  CloudArchitecture: riscv64
  CloudBuildName: server
  CloudID: nocloud
  CloudName: unknown
  CloudPlatform: nocloud
  CloudSerial: 20240423
  CloudSubPlatform: seed-dir (/var/lib/cloud/seed/nocloud-net)
  Date: Thu Nov  7 17:37:00 2024
  SourcePackage: fio
  UpgradeStatus: No upgrade log present (probably fresh install)

  [ Test Plan ]

  On a riscv64 system run

   fio -name test --size=1M --rw=read --bs=4k

  This should provide output similar too

  $ fio -name test --size=1M --rw=read --bs=4k
  test: (g=0): rw=read, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T) 4096B-4096B, ioengine=psync, iodepth=1
  fio-3.36
  Starting 1 process
  test: Laying out IO file (1 file / 1MiB)

  test: (groupid=0, jobs=1): err= 0: pid=2593: Thu Nov  7 17:42:07 2024
    read: IOPS=36.6k, BW=143MiB/s (150MB/s)(1024KiB/7msec)
      clat (usec): min=7, max=672, avg=21.28, stdev=74.34
       lat (usec): min=7, max=673, avg=21.74, stdev=74.43
      clat percentiles (usec):
       |  1.00th=[    8],  5.00th=[    8], 10.00th=[    8], 20.00th=[    9],
       | 30.00th=[    9], 40.00th=[    9], 50.00th=[    9], 60.00th=[    9],
       | 70.00th=[    9], 80.00th=[    9], 90.00th=[   10], 95.00th=[   30],
       | 99.00th=[  441], 99.50th=[  611], 99.90th=[  676], 99.95th=[  676],
       | 99.99th=[  676]
    lat (usec)   : 10=93.75%, 20=1.17%, 50=0.78%, 100=1.17%, 500=2.34%
    lat (usec)   : 750=0.78%
    cpu          : usr=0.00%, sys=83.33%, ctx=2, majf=0, minf=26
    IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%
       submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
       complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
       issued rwts: total=256,0,0,0 short=0,0,0,0 dropped=0,0,0,0
       latency   : target=0, window=0, percentile=100.00%, depth=1

  Run status group 0 (all jobs):
     READ: bw=143MiB/s (150MB/s), 143MiB/s-143MiB/s (150MB/s-150MB/s), io=1024KiB (1049kB), run=7-7msec

  Disk stats (read/write):
    sda: ios=0/0, sectors=0/0, merge=0/0, ticks=0/0, in_queue=0, util=0.00%

  [ Where problems could occur ]

  The suggested patch only affects riscv64. It affects the measurement
  of time.

  This could result in inaccurate measurements.

  [ Other Info ]

  n/a

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