Orchagent crashes when PFCWD delay restoration timer expires

[nazeerhussainf]

Description
Orchagent crashes when Pause Frame Control Watchdog's(PFCWD) delay restoration timer expires.

Topology:
Ixia Port 1 ----- Z9264 ----- Ixia Port 2

Steps to reproduce the issue:

1. Configure PFCWD on switch's interface connecting to Ixia port 2 where pause frames will be sent. Command : "pfcwd start --action drop ports Ethernet0 detection-time 400"
2. Send traffic from port 1 at 100% line rate with DSCP value as 000011(3) to port 2.
3. Enable PFC queue on Ixia port 2 and enable queue 3. Set Pause Quanta as 255 for Priority queue 3 on Port 2's stream.
4. Send pause control frames at 10000 packets/sec from port 2.
5. Stop pause control frames traffic on port 2.

Describe the results you received:
After step 4 traffic was dropped as expected.
After step 5 and delay restoration timer expired, Orchagent crashes. Traffic didn't resume.

Describe the results you expected:
After step 5 and delay restoration timer expired, traffic should resume.
orchagent.1561142120.38.core.gz
pfcwd_logs.txt

[liat-grozovik]

Can you provide information about the system you are using to run it? I wonder if this is a SONiC issue or SAI/SDK level.

I suggest you provide the output of the show techsupport for logs and more info on the configuraiton

[wendani]

Can you show the syslog message error? What drop actions are you using, zero buffer or ACL? Has your SAI implemented the remove/disqualify logic?

[nazeerhussainf]

Recreated the same issue using Dell Z9264 platform with 100G links on build 30.
SONiC Software Version: SONiC.HEAD.30-97645896
Distribution: Debian 9.9
Kernel: 4.9.0-9-2-amd64
Build commit: 9764589
Build date: Wed Jul 10 06:09:55 UTC 2019
Built by: johnar@jenkins-worker-4

Attached show-tech, syslog, core file and config_db.json file. Please refer PFCWD_100G.zip file.
PFCWD_100G.zip