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Date:   Thu, 6 Aug 2020 08:04:52 -0700
From:   Stephen Hemminger <>
Subject: Fw: [Bug 208833] New: applying HFSC causes soft lockup (probably
 related to pppoe)

Begin forwarded message:

Date: Thu, 06 Aug 2020 13:22:36 +0000
Subject: [Bug 208833] New: applying HFSC causes soft lockup (probably related to pppoe)

            Bug ID: 208833
           Summary: applying HFSC causes soft lockup (probably related to
           Product: Networking
           Version: 2.5
    Kernel Version: 5.7
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Other
        Regression: No

Created attachment 290795
example of my regular tc script

Applying and reapplying HFSC qdisc to interface with heavy load often causes
soft lockup (in random processes, in short time after applying qdisc).

Stack trace was somewhat uninformative and hard to get. I mostly observe this
with torrent client on PPPOE client interface when run attached script several

Will attach dmesg as soon as i will be able to reliably get it.
I tried to bisect bug, but stopped at some old kernel that won't even boot with
my config. So the problem could be old but unnoticed.

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