Wind River Support Network

HomeDefectsLIN6-4371

Not to be fixed

LIN6-4371 : System deadlocks from recursive kmod call

Created: Mar 5, 2013 Updated: Apr 19, 2018

Resolved Date: Apr 17, 2018

Previous ID: LIN4-14486

Found In Version: 6.0

Severity: Severe

Applicable for: Wind River Linux 6

Component/s: Kernel

Description

Problem Description
====================== 
The system deadlocks (at least since 2.6.10) when call_usermodehelper(UMH_WAIT_EXEC) request triggers call_usermodehelper(UMH_WAIT_PROC) request. 

Expected Behavior
====================== 
System runs normally.

Observed Behavior
====================== 
System deadlock.

Logs(Key error logs)
====================== 
# : > /tmp/dummy 
# echo /tmp/dummy > /proc/sys/kernel/hotplug 
# modprobe tipc 
^C^C

Steps to Reproduce

# : > /tmp/dummy 
# echo /tmp/dummy > /proc/sys/kernel/hotplug 
# modprobe tipc