Seems to be fixed in 4.4.0-187
** Changed in: linux (Ubuntu)
Status: Confirmed => Fix Released
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https://bugs.launchpad.net/bugs/1883597
Title:
Kernel 4.4.0-184
Bug present in 4.4.0-186.
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https://bugs.launchpad.net/bugs/1883597
Title:
Kernel 4.4.0-184 hangs when issuing tc qdisc command
Status in linux package in Ubuntu:
Bug present in 4.4.0-185 also.
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https://bugs.launchpad.net/bugs/1883597
Title:
Kernel 4.4.0-184 hangs when issuing tc qdisc command
Status in linux package in Ubuntu:
Sent a revert to the stable tree (my original comment linked above seems
to have been lost):
https://lore.kernel.org/stable/20200623150053.272985-1-t...@redhat.com/T/
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I can confirm this happens whenever sch_fq is used, regardless of the
hardware/driver. This seems to be caused by kernel 4.4.0-180 adding a
backport of upstream commit:
695b4ec0f0a9 ("pkt_sched: fq: use proper locking in fq_dump_stats()")
This commit was pulled in as part of upstream stable
apport information
** Tags added: apport-collected xenial
** Description changed:
On stock kernel 4.4.0.184-214, issuing "tc qdisc add dev eth0 root fq maxrate
25mbit" causes CPU lockup
(NMI watchdog: BUG: soft lockup - CPU#26 stuck for 22s! [tc:6394])
This does not occur on 4.4.0.179
** Attachment added: "lspci-vnvn.log"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1883597/+attachment/5384149/+files/lspci-vnvn.log
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** Attachment added: "version.log"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1883597/+attachment/5384148/+files/version.log
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