Date: Sat, 27 Feb 2021 22:02:03 +0100 From: Mateusz Guzik <mjguzik@gmail.com> To: Juraj Lutter <otis@freebsd.org> Cc: Rick Macklem <rmacklem@uoguelph.ca>, freebsd-current <freebsd-current@freebsd.org> Subject: Re: -CURRENT panics in NFS Message-ID: <CAGudoHHDaYTiQZBHQA2sRNRPobAxFq8auKNeS1hOBNZ851EQdg@mail.gmail.com> In-Reply-To: <6CD719B1-71B1-4EAB-A0D0-949ABA1751BB@FreeBSD.org> References: <E173E60B-D0AF-4315-A99F-ABA1F3D5BBEF@FreeBSD.org> <FBDA3107-00AF-4CF3-B6FA-F09EA8163D7B@FreeBSD.org> <560DD7DF-B1C0-432B-BFCA-9D00819E0C28@FreeBSD.org> <YQXPR0101MB0968CF8BCCD34DB340879F44DD9C9@YQXPR0101MB0968.CANPRD01.PROD.OUTLOOK.COM> <D339EFAA-56F2-4F26-BB12-FBD1C854BBC1@FreeBSD.org> <CAGudoHHqd2o-zcaJEF0=XbqV7etRKCPCtqj58QP56gQtK%2BEUAQ@mail.gmail.com> <6CD719B1-71B1-4EAB-A0D0-949ABA1751BB@FreeBSD.org>
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You should be able to just use kgdb on the old kernel and the
crashdump you already collected, provided both are still around.
Alternatively boot with this without the fix:
diff --git a/sys/kern/vfs_cache.c b/sys/kern/vfs_cache.c
index fef1e31d197b..c4d2990b155d 100644
--- a/sys/kern/vfs_cache.c
+++ b/sys/kern/vfs_cache.c
@@ -2266,6 +2266,9 @@ cache_enter_time(struct vnode *dvp, struct vnode
*vp, struct componentname *cnp,
KASSERT(cnp->cn_namelen <=3D NAME_MAX,
("%s: passed len %ld exceeds NAME_MAX (%d)", __func__,
cnp->cn_namelen,
NAME_MAX));
+ if (dvp =3D=3D vp) {
+ panic("%s: same vnodes; cnp [%s] len %ld\n", __func__,
cnp->cn_nameptr, cnp->cn_namelen);
+ }
VNPASS(dvp !=3D vp, dvp);
VNPASS(!VN_IS_DOOMED(dvp), dvp);
VNPASS(dvp->v_type !=3D VNON, dvp);
On 2/27/21, Juraj Lutter <otis@freebsd.org> wrote:
> I am now running a patched kernel, without problems.
>
> I can boot to unpatched one and see the output of these ddb commands.
>
> otis
>
> =E2=80=94
> Juraj Lutter
> XMPP: juraj (at) lutter.sk
> GSM: +421907986576
>
>> On 27 Feb 2021, at 21:49, Mateusz Guzik <mjguzik@gmail.com> wrote:
>>
>> Can you dump 'struct componentname *cnp'? This should do the trick:
>> f 12
>> p cnp
>>
>
>
>
--=20
Mateusz Guzik <mjguzik gmail.com>
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