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Re: kern/54541: kernel panic using "zfs diff"
The following reply was made to PR kern/54541; it has been noted by GNATS.
From: Brad Spencer <brad%anduin.eldar.org@localhost>
Cc: kern-bug-people%netbsd.org@localhost, gnats-admin%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost,
Subject: Re: kern/54541: kernel panic using "zfs diff"
Date: Sat, 12 Oct 2019 07:33:14 -0400
"J. Hannken-Illjes" <hannken%eis.cs.tu-bs.de@localhost> writes:
> The following reply was made to PR kern/54541; it has been noted by GNATS.
> From: "J. Hannken-Illjes" <hannken%eis.cs.tu-bs.de@localhost>
> To: gnats-bugs%netbsd.org@localhost
> Subject: Re: kern/54541: kernel panic using "zfs diff"
> Date: Sat, 12 Oct 2019 10:02:28 +0200
> Content-Type: multipart/mixed;
> Content-Transfer-Encoding: quoted-printable
> Content-Type: text/plain;
> > On 12. Oct 2019, at 01:50, Brad Spencer <brad%anduin.eldar.org@localhost> wrote:
> > [ 472375.2036056] panic: kernel diagnostic assertion "fdm !=3D NULL" =
> failed: file "/usr/src/sys/kern/vfs_trans.c", line 166 mount 0x0 invalid
> Sorry for being late, looks like vn_rdwr() gets called
> with garbage instead of a vnode.
> The attached diff could help to track it down.
> Do you have a recipe to trigger this panic?
> J. Hannken-Illjes - hannken%eis.cs.tu-bs.de@localhost - TU Braunschweig
For me personally, it is something like this, although I don't know how
much of this matters:
sysctl -w ddb.onpanic=1
zpool create tank xbd4d <- 1GB presented to a DOMU
zfs create tank/ds1
zfs set quota=100m tank/ds1
(fill tank/ds1 up to about 80% or so with anything, I used multiple files, but I doubt that matters)
zfs snapshot tank/ds1@sn1
(change tank/ds1. Add or delete something, I think any change will work)
You will end up with something like this:
test3# zfs list -t all
NAME USED AVAIL REFER MOUNTPOINT
rstuff 264M 1.55G 23K /rstuff
rstuff/var 261M 139M 261M legacy
tank 80.8M 1.73G 23K /tank
tank/ds1 80.2M 19.8M 80.2M /tank/ds1
tank/ds1@sn1 18K - 80.2M -
zfs diff tank/ds1@sn1
I applied the included patch to a test build which is building now, but
I can't retest this for a bit. The test DOMU that triggers this has 1GB
of memory given to it and is running a pretty recent build.
Brad Spencer - brad%anduin.eldar.org@localhost - KC8VKS - http://anduin.eldar.org
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