Re: xfstests, xfs test 080 fails on arm 32bit

Dave Chinner
2015-09-30T05:04:34Z

On Tue, Sep 29, 2015 at 03:32:55PM +0200, Angelo Dureghello wrote:
> Hi,
>
> executing this test on a 32bit arm. i get (i traced mmapping sizes):
>
> # ./start_xfs_test.sh
> QA output created by 080
> [ 161.827446] XFS (mmcblk0p5): Mounting V4 Filesystem
> [ 162.357952] XFS (mmcblk0p5): Ending clean mount
>
> mmapping 512000000
> mmapping 512000000
> mmapping 512000000
> mmapping 512000000
> mmapping 512000000
> mmapping 512000000
>
> oio ( 3241) 15:18:17
> ---------------------
> mmap() failed - 0xffffffff 12
>
> doio ( 3241) 15:18:17
> ---------------------
> mmap-read() request failed: Cannot allocate memory (12)
> Request number 15
> fd 4 is file /media/p5/rwtest.file - open flags are 0 O_RDONLY,
> read done at file offset 978498
> number of requests is 1, strides per request is 1
> i/o byte count = 119505
> memory alignment is unaligned
>
> syscall: mmap-read(NULL, 512000000, PROT_READ, MAP_SHARED, 4, 0)
> file is mmaped to: 0x0
> file-mem=0xeee42, length=119505, buffer=0x484a6

Does it close/unmap the other files it mmaps? i.e. 32 bit only has a
3GB address space for user applications (IIRC), so the 6th 512MB
mapping will run the process out of address space and hence fail....

> doio ( 3241) 15:18:17
> ---------------------
> doio(): operation 120 returned != 0
> rwtest.sh : iogen reported errors (r=141)
>
>
> Is it possible the test was thought to pass on 64bit systems ?

Works just fine on 64 bit systems:

$ sudo ./check xfs/080
FSTYP -- xfs (debug)
PLATFORM -- Linux/x86_64 test2 4.3.0-rc1-dgc+
MKFS_OPTIONS -- -f -bsize=4096 /dev/sdg
MOUNT_OPTIONS -- -o context=system_u:object_r:nfs_t:s0 /dev/sdg
/mnt/scratch

xfs/080 2s ... 7s
Ran: xfs/080
Passed all 1 tests

And looking at the memory footprint:

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
3300 root 20 0 3010672 1612 1344 D 4.7 0.0 0:00.14 doio

Yup, 3GB of virtual address space used, 1.6MB of actual memory used.

_require_64bit_userspace is probably needed here...

Cheers,

Dave.
--
Dave Chinner
david@fromorbit.com

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