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Bug 2177080

Summary: passt doesn't terminate gracefully when open files quota is reached
Product: Red Hat Enterprise Linux 9 Reporter: Stefano Brivio <sbrivio>
Component: passtAssignee: Stefano Brivio <sbrivio>
Status: CLOSED ERRATA QA Contact: Lei Yang <leiyang>
Severity: high Docs Contact:
Priority: medium    
Version: 9.2CC: chayang, jinzhao, juzhang, pvlasin
Target Milestone: rcKeywords: Triaged
Target Release: 9.2Flags: pm-rhel: mirror+
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: passt-0^20230222.g4ddbcb9-2.el9_2 Doc Type: No Doc Update
Doc Text:
Story Points: ---
Clone Of:
: 2179036 (view as bug list) Environment:
Last Closed: 2023-05-09 07:43:36 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2179036    

Description Stefano Brivio 2023-03-09 21:48:44 UTC 
Set a "low" hard quota for number of open files (e.g. ulimit -Hn 1000) and configure passt to forward all the TCP ports, e.g.:

  passt -f -t all

At this point, passt reports that it's failing to open sockets with a very long sequence of "Too many open files" messages, and it will terminate.

If you forward just a bit less than 1000 ports, it might not even terminate, because it can actually bind all the ports and set up all the sockets needed during the setup phase, but not work at all, as it can't open outbound sockets.

This behaviour looks quite confusing, and was tracked upstream at: https://bugs.passt.top/show_bug.cgi?id=27.

We need this upstream commit:

  https://passt.top/passt/commit/?id=bb2b67cb3549ea2509f5b7b88790e08d2e362351
  conf: Terminate on EMFILE or ENFILE on sockets for port mapping
Comment 22 errata-xmlrpc 2023-05-09 07:43:36 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (passt bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2023:2292