[LU-8249] Potential deadlock in lnet

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.9.0
• Labels: patch
• Severity: 3
• Assignee: Doug Oucharek (Inactive)
• Reporter: CEA

Description

While testing a patch I was able to deadlock all the CPU of my machine.
After investigating the log reports I found out that in "LNetMDAttach" (implemented in lnet/lnet/lib-md.c) there is a call to the "vfree" function in interrupt context which is illegal in linux kernel versions prior to 3.10.

I cannot be sure whether or not this was actually the cause of my problem though, because I have not been able to reproduce since then.