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Bug 2216184 - tcpslice: problems finding end packet of file <filename>
Summary: tcpslice: problems finding end packet of file <filename>
Keywords:
Status: CLOSED MIGRATED
Alias: None
Product: Red Hat Enterprise Linux 9
Classification: Red Hat
Component: tcpdump
Version: 9.2
Hardware: Unspecified
OS: Unspecified
unspecified
low
Target Milestone: rc
: ---
Assignee: Michal Ruprich
QA Contact: rhel-cs-infra-services-qe
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2023-06-20 11:36 UTC by Eduardo Olivares
Modified: 2023-09-21 22:39 UTC (History)
1 user (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2023-09-21 22:39:33 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Github the-tcpdump-group tcpslice issues 23 0 None open tcpslice can't read capture file with just one packet 2023-06-22 08:22:52 UTC
Red Hat Issue Tracker   RHEL-6887 0 None Migrated None 2023-09-21 22:39:29 UTC
Red Hat Issue Tracker RHELPLAN-160285 0 None None None 2023-06-20 11:41:32 UTC

Description Eduardo Olivares 2023-06-20 11:36:51 UTC 
Description of problem:
My tests capture traffic on two different interfaces from a VM and then merge the resulting captures with tcpslice when they are not empty.
Sometimes, the tcpslice command fails like this:
[root@cmp-3-0 ~]# tcpslice -v -w /tmp/kk /tmp/tmp.tozOLM0ErS /tmp/tmp.k62LTkDd4k
tcpslice: problems finding end packet of file /tmp/tmp.k62LTkDd4k


This is how this capture files were obtained:
$ tcpdump -s0 -Uni enp2s0 src host 2001:db8::f816:3eff:fe6a:1fe6 and dst host f00d:f00d:f00d:4::1 and tcp src port 22 -w /tmp/tmp.tozOLM0ErS &
$ tcpdump -s0 -Uni enp3s0 src host 2001:db8::f816:3eff:fe6a:1fe6 and dst host f00d:f00d:f00d:4::1 and tcp src port 22 -w /tmp/tmp.k62LTkDd4k &

I can open both files with "tcpdump -r" on the RHEL9.2 VM where they were obtained, so I don't know what is the problem with tmp.k62LTkDd4k .

I have tried in my laptop (Fedora 37 - tcpdump-4.99.4-2.fc37.x86_64) and I got the same tcpslice failure. However, mergecap worked well:
$ mergecap -w merged tmp.k62LTkDd4k tmp.tozOLM0ErS


I will attach the previous files to this BZ.




Version-Release number of selected component (if applicable):
RHEL 9.2 - tcpdump-4.99.0-6.el9.x86_64

How reproducible:
This tests are re-executed often by our jobs and they fail due to this issue sometimes... I'd say 5% times (rough estimation)

Steps to Reproduce:
See previous description

Actual results:
tcpsile fails

Expected results:
tcpsile should not fail
Comment 4 RHEL Program Management 2023-09-21 22:36:49 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 5 RHEL Program Management 2023-09-21 22:39:33 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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