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> In-Reply-To: <200207091156.g69BuBwr003693@gw.catspoiler.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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