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Description of problem:
TCP transport should be able to tolerate mild channel corruption (0.5%). Yet the md5sum value doesn't match when sending a ~500MB file.
Version-Release number of selected component (if applicable):
4.18.0-492.el8.aarch64
How reproducible:
100%
Steps to Reproduce:
Detailed steps are filed in below Polarion cases:
https://polarion.engineering.redhat.com/polarion/#/project/RHELVIRT/workitem?id=VIRT-80160https://polarion.engineering.redhat.com/polarion/#/project/RHELVIRT/workitem?id=VIRT-80158
Actual results:
File size matches but not md5sum
# ls -al server_data
-rw-r--r--. 1 root root 524288000 May 30 04:22 server_data
# md5sum server_data
17da58d5050b0a58e3a44685e2b9d522 server_data
# ls -al client_data
-rw-r--r--. 1 root root 524288000 May 30 04:22 client_data
# md5sum client_data
7bb64858c2801de10cac8abe4a8968f0 client_data
Expected results:
md5sum value matches.
Additional info:
1. x86_64 does not have this issue.
2. Both IPv4 and IPv6 have this issue.
3. No such issue without channel corruption.
In case people can't view Polarion links, here are the steps:
1. Create 2 VMs on Azure. And make sure checksum offload is turned on -
# ethtool -k eth0|grep checksum
2. Install below packages -
nmap-ncat iproute-tc kernel-modules-extra
3. On VM#1 open a listen port with 'nc' -
# nc -l 2233 > server_data
4. On VM#2 create a 0.5% channel corruption -
# tc qdisc add dev eth0 root netem corrupt 0.5%
Then generate a 500MB file and send to VM#1 -
# dd if=/dev/urandom of=client_data bs=1024k count=500; nc <VM#1_IP> 2233 < client_data
5. Compare md5sum value on 'server_data' and 'client_data'.
Comment 7RHEL Program Management
2023-09-22 15:09:22 UTC
Issue migration from Bugzilla to Jira is in process at this time. This will be the last message in Jira copied from the Bugzilla bug.
Comment 8RHEL Program Management
2023-09-22 15:10:54 UTC
This BZ has been automatically migrated to the issues.redhat.com Red Hat Issue Tracker. All future work related to this report will be managed there.
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