[LU-4612] kernel panics at device mount time

• Type: Bug
• Resolution: Fixed
• Priority: Major
• Fix Version/s: Lustre 2.6.0
• Affects Version/s: Lustre 2.6.0
• Labels: ssf
• Severity: 3
• Assignee: Bob Glossman (Inactive)
• Reporter: Bob Glossman (Inactive)

Description

kernel panics seen at device mount time, most typically at first mount of MDS.
example error log:

<0>[  157.751282] LustreError: 3510:0:(sec_ctx.c:80:pop_ctxt()) LBUG
<4>[  157.752778] Pid: 3510, comm: mount.lustre
<4>[  157.752779] 
<4>[  157.752780] Call Trace:
...
...

On careful analysis this flaw was introduced by the earlier commit commit 3e7573cc14a331f01150814495e2345793e22f06, LU-2753 lvfs: cleanup lvfs.h and collateral. Landed in Jan., so it's fairly recent.
That previous commit does a call to pop_ctxt()
with arguments in the wrong order, reversed from what they should be.

Plan to submit a simple 1 line fix that repairs the problem.