Date: Wed, 26 Apr 2000 17:46:43 +0100 From: "Peter Edwards (local)" <peter.edwards@openet-telecom.com> To: Maxim Sobolev <sobomax@altavista.net>, current@FreeBSD.ORG Subject: Re: vn.ko load/unload/mount = panic Message-ID: <39071D73.28DFC120@openet-telecom.com> References: <390702C6.BCC0CA88@altavista.net> <39070A7A.A2766B32@openet-telecom.com>
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Sorry, I think that fix is incomplete (though it'll prolly stop the
crashes). I think there should be a destroy_dev() call for each created
device in the MOD_UNLOAD case also.
I'll make a patch and send-pr it once I get back to my home machine,
unless someone more experienced feels the need to do it.
--
Peter.
"Peter Edwards (local)" wrote:
>
> Hi,
> After a (very) quick look at the source it looks like there's a missing
> cdevsw_remove() missing from the MOD_UNLOAD/MOD_SHUTDOWN event handling
> I haven't time to test it, but try this:
>
> *** vn.c.old Wed Apr 26 16:23:03 2000
> --- vn.c Wed Apr 26 16:24:06 2000
> ***************
> *** 762,767 ****
> --- 762,768 ----
> case MOD_UNLOAD:
> /* fall through */
> case MOD_SHUTDOWN:
> + cdevsw_remove(&vn_cdevsw);
> for (;;) {
> vn = SLIST_FIRST(&vn_list);
> if (!vn)
>
> Maxim Sobolev wrote:
> >
> > Hi,
> >
> > I've already submitted this crash report earlier but it seems that developers
> > in -current list are too busy discussing whether Matt allowed to commit his SMP
> > work into 4.0 to pay attention to "ordinary" panic reports :-(. Following is
> > slightly simplified course of actions which is known to produce kernel panic on
> > both 4.0 and 5.0:
> >
> > root@notebook# kldstat
> > Id Refs Address Size Name
> > 1 2 0xc0100000 1c2f48 kernel
> > 2 1 0xc02c3000 30c8 splash_bmp.ko
> > root@notebook# mount /dev/vn0c /mnt
> > mount: Device not configured
> > root@notebook# kldload /modules/vn.ko
> > root@notebook# kldstat
> > Id Refs Address Size Name
> > 1 3 0xc0100000 1c2f48 kernel
> > 2 1 0xc02c3000 30c8 splash_bmp.ko
> > 3 1 0xc0823000 3000 vn.ko
> > root@notebook# kldunload -i 3
> > root@notebook# mount /dev/vn0c /mnt
> > [BINGO]
> > Fatal trap 12: page fault while in kernel mode
> > [...]
> >
> > -Maxim
> >
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