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()
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