[LU-5174] An easy way to switch from panic to BUG

• Type: Bug
• Resolution: Incomplete
• Priority: Minor
• Affects Version/s: Lustre 2.6.0
• Labels: patch
• Severity: 3
• Assignee: Emoly Liu
• Reporter: Sebastien Buisson (Inactive)

Description

Hi,

panic on LBUG ends in a way where some registers are not properly backed up. So we loose the opportunity to retrieve the content of the registers by the time of the failure.
Having BUG instead of panic sends an invalid instruction raising an interrupt and then dump all registers, giving a real advantage of not losing this critical information.

This is why we propose to add a new 'use_bug_instead_of_panic' entry under /proc/sys/lnet, that is complementary with panic_on_lbug. To use it, panic_on_lbug must be set, and in that case we replace panic with BUG.

I will attach a patch to address this code change.

Sebastien.