Messages in this thread | | | Date | Wed, 04 Nov 2015 06:25:29 +0200 | From | Denys Fedoryshchenko <> | Subject | Re: kernel panic in 4.2.3, rb_erase in sch_fq |
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On 2015-11-04 00:06, Cong Wang wrote: > On Mon, Nov 2, 2015 at 6:11 AM, Denys Fedoryshchenko > <nuclearcat@nuclearcat.com> wrote: >> Hi! >> >> Actually seems i was getting this panic for a while (once per week) on >> loaded pppoe server, but just now was able to get full panic message. >> After checking commit logs on sch_fq.c i didnt seen any fixes, so >> probably >> upgrading to newer kernel wont help? > > > Can you share your `tc qdisc show dev xxxx` with us? And how to > reproduce > it? I tried to setup htb+fq and then flip the interface back and forth > but I don't > see any crash. My guess it wont be easy to reproduce, it is happening on box with 4.5k interfaces, that constantly create/delete interfaces, and even with that this problem may happen once per day, or may not happen for 1 week.
Here is script that is being fired after new ppp interface detected. But pppoe process are independent from process that are "establishing" shapers.
/sbin/tc qdisc del root /sbin/tc qdisc add handle 1: root htb default 3
/sbin/tc filter add parent 1:0 protocol ip prio 4 handle 1 fw flowid 1:3 /sbin/tc filter add parent 1:0 protocol ip prio 3 u32 match ip protocol 6 0xff match ip src 10.0.252.8/32 flowid 1:3/sbin/tc filter add parent 1:0 protocol ip prio 5 u32 match ip protocol 1 0xff flowid 1:0 /sbin/tc filter add parent 1:0 protocol ip prio 5 u32 match ip protocol 6 0xff match ip sport 80 0xffff flowid 1:4 /sbin/tc filter add parent 1:0 protocol ip prio 5 u32 match ip protocol 6 0xff match ip sport 443 0xffff flowid 1:5 /sbin/tc filter add parent 1:0 protocol ip prio 100 u32 match u32 0 0 flowid 1:2
/sbin/tc class add classid 1:1 parent 1:0 htb rate 512Kbit ceil 512Kbit. /sbin/tc class add classid 1:2 parent 1:1 htb rate 32Kbit ceil 512Kbit /sbin/tc class add classid 1:3 parent 1:0 htb rate 10Mbit ceil 10Mbit /sbin/tc class add classid 1:4 parent 1:1 htb rate 32Kbit ceil 512Kbit /sbin/tc class add classid 1:5 parent 1:1 htb rate 32Kbit ceil 512Kbit
/sbin/tc qdisc add parent 1:2 fq limit 300 /sbin/tc qdisc add parent 1:3 pfifo limit 300 /sbin/tc qdisc add parent 1:4 fq limit 300 /sbin/tc qdisc add parent 1:5 fq limit 300
Possible cases come to my mind (but maybe i missed others): Script and tc working and interface are deleted in a process (e.g. interface disappears) Script deleting root while there is heavy traffic on interface and a lot of packets queued ppp interface destroyed, while there is a lot of traffic queued on it (this one a bit rare situation)
> > Thanks.
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