Bug 208833 - applying HFSC causes soft lockup
Summary: applying HFSC causes soft lockup
Status: NEW
Alias: None
Product: Networking
Classification: Unclassified
Component: Other (show other bugs)
Hardware: x86-64 Linux
: P1 normal
Assignee: Stephen Hemminger
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2020-08-06 13:22 UTC by code
Modified: 2020-10-19 18:34 UTC (History)
1 user (show)

See Also:
Kernel Version: 5.7
Subsystem:
Regression: No
Bisected commit-id:

Attachments
example of my regular tc script (887 bytes, application/x-shellscript)
2020-08-06 13:22 UTC, code 		Details
dmesg from 5.9.1 kernel (11.22 KB, text/plain)
2020-10-19 18:34 UTC, code 		Details
Add an attachment (proposed patch, testcase, etc.)

Description code 2020-08-06 13:22:36 UTC 
Created attachment 290795 [details]
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 times.

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.
Comment 1 code 2020-10-19 18:34:43 UTC 
Created attachment 293067 [details]
dmesg from 5.9.1 kernel

was finally able to catch some log from 5.9.1 kernel
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