Date: Sun, 25 Jun 2017 22:44:04 +0000 From: Rick Macklem <rmacklem@uoguelph.ca> To: Fabian Freyer <fabian.freyer@physik.tu-berlin.de>, "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org> Subject: Re: Kernel panic in nfsv4_loadattr Message-ID: <YTXPR01MB0189AEFF9AE549885A1F1373DDDE0@YTXPR01MB0189.CANPRD01.PROD.OUTLOOK.COM> In-Reply-To: <118188c1-6507-fd83-9d6e-94e304521011@physik.tu-berlin.de> References: <118188c1-6507-fd83-9d6e-94e304521011@physik.tu-berlin.de>
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Fabian Freyer wrote:
> I've had a panic on a host mounting NFSv4 shares. There are also jails
> running on this host acessing these shares (I assume this might be a
> problem, as I'm also seeing the nfsuserd messages mentioned in [1]).
> Here's the last relevant lines of the kernel message buffer.
> Jun 25 05:47:39 emmi nfsuserd:[916]: req from ip=3D0x[REDACTED] port=3D94=
9
> kernel trap 12 with interrupts disabled
The nfsuserd daemon doesn't work when jails are enabled. (I'm not a jails
person, but I understand jails blocks/disables 127.0.0.1 and that will defi=
nitely
break nfsuserd.)
I have a patch that switches nfsuserd to use a local socket to avoid this, =
but
another tester experienced hangs when using it. I believe the hangs were
caused by races in the local socket code tickled by having multiple nfsuser=
d
daemons running, but since I could not reproduce the hang, I never committe=
d
the patch to head, etc.
(There is PR#205193 for this.)
Without the patch, you have three choices:
1 - Set vfs.nfsd.enable_stringtouid=3D1 and don't run the nfsuserd. (This s=
hould allow
NFSv4 to work, assuming you are not doing Kerberos mounts and your ui=
d space
is consistent between clients and server.)
2 - Get rid of the jails.
3 - Change all your mounts to NFSv3 and don't try to run the nfsuserd daemo=
n.
In case you can test the patch, I have attached it. (It is actually 2 patch=
es, one for
nfsuserd.c and one for the kernel. I don't remember what version of sources=
it
is done for, but since you didn't mention what version of FreeBSD you are r=
unning...)
If you test it, make sure to include "1" as the last argument to nfsuserd, =
so that it
only runs one daemon.
- Until someone successfully tests this patch, this problem will probably r=
emain, rick
[stuff snipped]
ps: If you can test it, but have trouble applying the patch, email and I'll=
try to update
the patch to current sources.=
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