[Users] weird filesystem corruption issues

[Aleksandar Ivanisevic]

Hi,

please help me debug this weird issue. This has been happening
occasionally in my setup for literally years, on at least 10 different
OVZ kernels.

in VE:

# md5sum /tmp/application.log.backup 
89024ce67704e3cf2aa9e7b2e2584a60  /tmp/application.log.backup

# gzip > application.log.backup.gz < /tmp/application.log.backup 
# zcat application.log.backup.gz | md5sum

zcat: application.log.backup.gz: unexpected end of file
986389b791ee94692da36a56be29392a  -

but the next attempt 10 seconds later:

# gzip > application.log.backup.gz < /tmp/application.log.backup 
# /var/log zcat application.log.backup.gz | md5sum
89024ce67704e3cf2aa9e7b2e2584a60  -

the file is truncated at the random place.

I can reliably reproduce this by running this in a loop:

root@ /var/log while true; do gzip > application.log.backup.gz < /tmp/application.log.backup ; zcat application.log.backup.gz | md5sum; done
89024ce67704e3cf2aa9e7b2e2584a60  -

zcat: application.log.backup.gz: unexpected end of file
ad830a43ccf4641afc2c0dfd42b3d5b8  -
89024ce67704e3cf2aa9e7b2e2584a60  -
89024ce67704e3cf2aa9e7b2e2584a60  -

zcat: application.log.backup.gz: unexpected end of file
a35d71d503b3cfc249409075afd9295f  -
89024ce67704e3cf2aa9e7b2e2584a60  -
89024ce67704e3cf2aa9e7b2e2584a60  -


But when I run it from the HN, there is never any issue


# while true; do gzip > application.log.backup.gz < /vz/private/1090/tmp/application.log.backup ; zcat application.log.backup.gz | md5sum; done
89024ce67704e3cf2aa9e7b2e2584a60  -
89024ce67704e3cf2aa9e7b2e2584a60  -
89024ce67704e3cf2aa9e7b2e2584a60  -
89024ce67704e3cf2aa9e7b2e2584a60  -
89024ce67704e3cf2aa9e7b2e2584a60  -
89024ce67704e3cf2aa9e7b2e2584a60  -
89024ce67704e3cf2aa9e7b2e2584a60  -
89024ce67704e3cf2aa9e7b2e2584a60  -
89024ce67704e3cf2aa9e7b2e2584a60  -
89024ce67704e3cf2aa9e7b2e2584a60  -
89024ce67704e3cf2aa9e7b2e2584a60  -
89024ce67704e3cf2aa9e7b2e2584a60  -
89024ce67704e3cf2aa9e7b2e2584a60  -