I could have been more explicit. The thread linked to in the initial bug
description also contains a simplified script by Ben Hutchings
<[email protected]> that triggers the kernel crash (included below for the
reference):
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=921542#10
The script triggers the kernel crash in the latest available Ubuntu
kernel, that is 4.15.0.48, which affects bionic and xenial linux-hwe.
--- BEGIN ---
#!/bin/sh -ex
modprobe ifb
while true; do
tc qdisc add dev ifb0 root handle 2:0 prio bands 5
tc qdisc add dev ifb0 parent 2:5 sfq
tc filter add dev ifb0 parent 2:0 protocol ip prio 5 handle 0 tcindex mask
0 classid 2:5 pass_on
tc qdisc del dev ifb0 root || true
done
--- END ---
** Bug watch added: Debian Bug tracker #921542
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=921542
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https://bugs.launchpad.net/bugs/1825942
Title:
kernel crash : net_sched race condition in tcindex_destroy()
Status in linux package in Ubuntu:
Confirmed
Bug description:
I am running into a kernel crash issue using latest Ubuntu 4.15 kernel.
It does not appear to have been fixed in Ubuntu-4.15.0-48.51.
This crash has also been reported for debian:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=921542
The kernel crash issue was fixed in February in the Linux kernel:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=056a17982adbd52b2a6c5ec6266cee4521cd931b
I did test one of the recent kernel-ppa/mainline kernels, more specifically:
linux-image-unsigned-4.19.34-041934-generic_4.19.34-041934.201904051741_amd64.deb
It seems to fix the problem, that is, no crashes experienced so far.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1825942/+subscriptions
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