From owner-freebsd-current  Tue Jul  9  5:47:46 2002
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Date: Tue, 9 Jul 2002 05:47:30 -0700
From: Maxime Henrion <mux@freebsd.org>
To: current@FreeBSD.org
Cc: Don Lewis <dl-freebsd@catspoiler.org>
Subject: Re: /usr/src/sys/vm/uma_core.c:1332: could sleep with "kernel linker" locked from /usr/src/sys/kern/kern_linker.c:1797
Message-ID: <20020709124730.GF42325@elvis.mu.org>
References: <200207091156.g69BuBwr003693@gw.catspoiler.org>
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Don Lewis wrote:
> I recently started seeing the warning message:
> 
> /usr/src/sys/vm/uma_core.c:1332: could sleep with "kernel linker" locked
> from /usr/src/sys/kern/kern_linker.c:1797
> 
> at boot time on my -current box.  It appears to be related to the
> changes in rev 1.90 of kern_linker.c.
> 
> I suspect that memory is getting allocted inside this loop in
> sysctl_kern_function_list():
> 
>         mtx_lock(&kld_mtx);
>         TAILQ_FOREACH(lf, &linker_files, link) {
>                 error = LINKER_EACH_FUNCTION_NAME(lf,
>                     sysctl_kern_function_list_iterate, req);
>                 if (error) {
>                         mtx_unlock(&kld_mtx);
>                         return (error);
>                 }
>         }
>         mtx_unlock(&kld_mtx);
> 
> but I got lost in a maze of twisty little passages.
> 
> And where the heck is LINKER_EACH_FUNCTION_NAME defined?  This is the
> only occurence of this string in the entire /usr/src tree ...

It's defined in linker_if.h, which is a generated header, which is why
you can't find it in the source tree.  This macro calls a kobj function,
which might call malloc().  That's why you're getting the warning.

Maxime

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