Date: Tue, 23 Jan 2001 15:06:39 +0200 From: Vallo Kallaste <vallo@matti.ee> To: Bosko Milekic <bmilekic@technokratis.com> Cc: John Baldwin <jhb@FreeBSD.ORG>, Alfred Perlstein <bright@wintelcom.net>, cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG Subject: Re: cvs commit: src/sys/kern uipc_mbuf.c Message-ID: <20010123150639.A50085@myhakas.matti.ee> In-Reply-To: <005001c0801d$9e2ead80$1f90c918@jehovah>; from bmilekic@technokratis.com on Tue, Jan 16, 2001 at 07:37:05PM -0500 References: <XFMail.010115233233.jhb@FreeBSD.org> <005001c0801d$9e2ead80$1f90c918@jehovah>
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On Tue, Jan 16, 2001 at 07:37:05PM -0500, Bosko Milekic <bmilekic@technokratis.com> wrote: > The discussed situation was probably a lock order reversal w.r.t. Giant and > some driver lock (in an MP safe driver). In one case, as you mentionned, > Giant can be acquired before the driver lock (the ifconfig case you spoke of, > when the call is originating from a system call), but in the interrupt case, > the driver lock would be acquired first, followed by Giant in the allocation > routines. Sorry for disturbing this highly technical discussion, but all that reminds me of some occasional kernel messages I've seen: Jan 19 07:53:05 myhakas /boot/smpkernel/kernel: lock order reversal Jan 19 07:53:05 myhakas /boot/smpkernel/kernel: 1st fxp0 last acquired @ ../../pci/if_fxp.c:842 Jan 19 07:53:05 myhakas /boot/smpkernel/kernel: 2nd 0xc0f50520 fxp1 @ ../../pci/if_fxp.c:993 Jan 19 07:53:05 myhakas /boot/smpkernel/kernel: 3rd 0xc0f50920 fxp0 @ ../../pci/if_fxp.c:842 I have two fxp and one ed (ne-2000 PCI clone) interfaces and bridge defined. Those messages appear almost always in sync with traffic over bridge interface(s). Is it something to care about? -- Vallo Kallaste vallo@matti.ee To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message
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