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weird filesystem corruption issues [message #48243] Tue, 09 October 2012 12:34 Go to previous message
Aleksandar Ivanisevic is currently offline  Aleksandar Ivanisevic
Messages: 34
Registered: April 2011
Member
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 -
 
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