[Gluster-users] Extra line of ^@^@^@ at the end of the file

[Joe Julian]

Would have responded on IRC, but you were already gone.

This is a twofold bug. One, your application should not be using the 
invalid flag, "SEEK_CUR^@^@^@^@^@^@^@^@^@^@^@^@^@". Second, you should 
file this as a bug report for gluster. It should probably fail EINVAL 
that lseek early.


On 03/17/17 07:56, Patrice Linel wrote:
> Hi all,
>
> When running a program on a distribute volume with sharding, sometimes
> the files get created with an extra line of special characters ^@^@^@ at
> the end. This happen under load with multiple nodes access the same
> folders with job creating files and reading them very shortly on another
> node (>0.5 sec later).
> I did an strace and the major difference is an Inappropriate ioctl
> followed by an lseek like below.
>
>
> When running the same workload on a panfs filesystem , the strace is the
> same but no extra line get created at the end.
>
>
> Thanks for any advice on further debugging or resolution on this.
>
> Patrice.
>
>
> ioctl(1, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS,
> {B38400 opost isig icanon echo ...}) = 0
> fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 32), ...}) = 0
> readlink("/proc/self/fd/1", "/dev/pts/32", 4095) = 11
> stat("/dev/pts/32", {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 32),
> ...}) = 0
> ioctl(1, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS,
> {B38400 opost isig icanon echo ...}) = 0
> fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 32), ...}) = 0
> ioctl(1, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS,
> {B38400 opost isig icanon echo ...}) = 0
> write(1, " Done reading parameter file for"..., 57) = 57
>
>
> VS
>
> ioctl(1, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS,
> 0x7fffffff6410) = -1 ENOTTY (Inappropriate ioctl for device)
> ioctl(1, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS,
> 0x7fffffffa630) = -1 ENOTTY (Inappropriate ioctl for device)
> fstat(1, {st_mode=S_IFREG|0664, st_size=22753, ...}) = 0
> ioctl(1, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS,
> 0x7fffffffa630) = -1 ENOTTY (Inappropriate ioctl for device)
> write(1, " Done reading parameter file for"..., 57 Done reading
> parameter file for chromosome            7
> ) = 57
> lseek(1, 0, SEEK_CUR^@^@^@^@^@^@^@^@^@^@^@^@^@)
>
>
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