Date: Fri, 17 Mar 2006 11:41:03 +0200 From: Kostik Belousov <kostikbel@gmail.com> To: Mikhail Teterin <mi+mx@aldan.algebra.com> Cc: current@freebsd.org Subject: Re: unkillable process stuck in "nfsaio" Message-ID: <20060317094103.GD1203@deviant.kiev.zoral.com.ua> In-Reply-To: <200603161516.27081.mi%2Bmx@aldan.algebra.com> References: <200603161516.27081.mi%2Bmx@aldan.algebra.com>
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On Thu, Mar 16, 2006 at 03:16:26PM -0500, Mikhail Teterin wrote:
> I was creating a big .iso image using mkisofs. The file was written over =
NFS=20
> to a remote share.
>=20
> When I decided to stop it and pressed Ctrl-C, the process hung and remain=
s=20
> unkillable (even with -9).
>=20
> Pressing Ctrl-T prints the following:
>=20
> load: 0.04 cmd: mkisofs 48414 [nfsaio] 0.70u 5.89s 0% 8784k
>=20
> The share is mounted as:
>=20
> pandora:/backup on /tmp/.a/pandora/backup (nfs, nosuid)
>=20
> The client is FreeBSD 6.1-PRERELEASE #0: Mon Mar 13 ... i386.
>=20
> The server information is deliberately witheld, because it should be poss=
ible=20
> to abort and kill the client-side writer regardless of the server version=
:-)
>=20
> Thanks in advance for fixing this bug. Yours,
>=20
> -mi
Just out of curiosity:
could you, please, test this little patch:
Index: sys/nfsclient/nfs_bio.c
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
RCS file: /usr/local/arch/ncvs/src/sys/nfsclient/nfs_bio.c,v
retrieving revision 1.154
diff -u -r1.154 nfs_bio.c
--- sys/nfsclient/nfs_bio.c 21 Nov 2005 19:23:46 -0000 1.154
+++ sys/nfsclient/nfs_bio.c 17 Mar 2006 09:38:40 -0000
@@ -1355,7 +1355,6 @@
if (error2)
return (error2);
if (slpflag =3D=3D PCATCH) {
- slpflag =3D 0;
slptimeo =3D 2 * hz;
}
}
It seems from the code that the condition should be easily
triggered.
Thanks.
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