On 05/19/2015 10:11 PM, Vijay Subramanian wrote:
Hi,
It seems latest net-next kernel crashes while unloading modules.
Please see simple script below to reproduce the crash.
===============================
#!/bin/bash
while true; do
# modules will be loaded automatically
tc qdisc add dev eth1 root handle 1: prio
tc filter add dev eth1 parent 1: u32 match u32 0 0 flowid 1
tc qdisc del dev eth1 root
rmmod cls_u32
rmmod sch_prio
done
=========================
It seems there is some refcounting or locking issue issue. I am unable
to easily post the dump but sometimes it points to crashes in various
functions in prio_class_ops (sch_prio.c), such as prio_walk(),
prio_dump_class etc. Probably, sch_prio call back functions are
invoked when they should not be.
I bisected this down to following commit:
commit 78fd1d0ab072d4d9b5f0b7c14a1516665170b565
Author: Thomas Graf <[email protected]>
Date: Tue Oct 21 22:05:38 2014 +0200
netlink: Re-add locking to netlink_lookup() and seq walker
If there are suggestions for me to try or you need more info, let me know.
Hmm, seems rather like the synchronize_net() removal in netlink_release()
must have uncovered a bug elsewhere.
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