Subject: Fw: [Bug 201735] New: serial8250: too much work for irq4

From: Stephen Hemminger <[email-masked]>
Date: Tue, 20 Nov 2018 07:14:24 -0800

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Date: Tue, 20 Nov 2018 07:09:26 +0000
From: [email-masked]
To: [email-masked]
Subject: [Bug 201735] New: serial8250: too much work for irq4

https://bugzilla.kernel.org/show_bug.cgi?id=201735

            Bug ID: 201735
           Summary: serial8250: too much work for irq4
           Product: Networking
           Version: 2.5
    Kernel Version: 4.4.0-116-generic
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: Other
          Assignee: [email-masked]
          Reporter: [email-masked]
        Regression: No

Created attachment 279549
  --> https://bugzilla.kernel.org/attachment.cgi?id=279549&action=edit  
LSHW log

Virtual machines loosing network access randomly. What happens when issue is
present:

 - Network device on guest machine is lost. It's impossible to access machine.
 - Virsh console available for connection. PING from affected guest is
available but with massive packet loss (20% ~ 70%).
 - Networking restart from the guest does not resolve problem.
 - When virsh  editing and setting to: <cpu mode='host-passthrough'/> issue
seems to be resolved (after reboot).

Such issue observed on SUPERMICRO server. LSHW report attached.

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