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Date: Mon, 10 Sep 2001 01:55:38 -0700 (PDT)
From: Ville-Pertti Keinonen <will@iki.fi>
To: freebsd-gnats-submit@FreeBSD.org
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Subject: kern/30482: calcru calls printf while holding a spin lock
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>Number:         30482
>Category:       kern
>Synopsis:       calcru calls printf while holding a spin lock
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Sep 10 02:00:01 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     Ville-Pertti Keinonen
>Release:        5.0-current
>Organization:
>Environment:
>Description:
A machine that previously frequently reported problems with
microuptime() going backwards in calcru started crashing after a
recent update.

I'm just guessing based on the stack trace and the panic message
(and this is the first time I look at anything related to SMPng
locking), but it seems that calcru calls printf which eventually
tries to wake up another process and grab allproc_lock while
sched_lock is held...

This seems like an obvious enough bug that it should not require
further details.
>How-To-Repeat:

>Fix:
Remove or defer the printf-calls.
>Release-Note:
>Audit-Trail:
>Unformatted:

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