From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefan Bader Subject: xen-4.6: xenstored crashes during domain->interface access Date: Tue, 26 Jan 2016 11:58:07 +0100 Message-ID: <56A7513F.9040504@canonical.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============7740616300208182815==" Return-path: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: "xen-devel@lists.xensource.com" Cc: Bastian Blank , Ian Campbell List-Id: xen-devel@lists.xenproject.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --===============7740616300208182815== Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="QmCE4f2q3Ulo0rgLRXJ25PEAQrLLvM8dD" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --QmCE4f2q3Ulo0rgLRXJ25PEAQrLLvM8dD Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hi, while playing around with xen-4.6 I stumbled over an odd problem and am wondering whether anybody has seen the same. A method to relatively quick= ly reproduce this for me seems to: - Start one domU (PV or HVM does not seem to matter) - Repeatedly call xenstore-ls a few times I think I never got beyond 10 repeats when the xenstore-ls call suddenly = locks up and xenstored crashes with a SIGBUS error. In the majority of cases (I= think I saw one different), the crash happens while accessing conn->domain->int= erface in tools/xenstore/xenstored_domain.c:domain_can_read(). Looking at the corefile produced by xenstored I now got at least one case= where the pointer still matches the previously mapped value. Though I think I h= ad also at least one run (with less debugging added) where it seemed to be really= wrong. There is more info at [1] in case someone is interested. I need to repeat a few more times to see how consistent the whole thing i= s. Does this happen for anybody else? Any advice what I should look at (in the se= nse of gathering better data)? Thanks, Stefan [1] https://bugs.launchpad.net/ubuntu/+source/xen/+bug/1538049 --QmCE4f2q3Ulo0rgLRXJ25PEAQrLLvM8dD Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) iQIcBAEBCgAGBQJWp1FOAAoJEOhnXe7L7s6jjTEP/3XWpySShmuiYmgY5fmUfaRu U5NutbpqUusJ4xm3P/ODySqGCY7MU7oWLUaqPMf7IqPwkKXMaePe9Wyh0GxcOx6t +sMaC2uODWI/MwmJKoP5Vlt/zsXAywBITJI/bZDny7e47Fvznuq4l/Csrqdo5Jcr NNWO11r8QBz0BPh7kXsbjQRuWhthZuYC/5cHMsR+rgGI5XbkjrNMHZ962vdF4FPA chnpnl2h6mERKn50GoutQ9v1N+zOurZp4FV/m8oHbk20CFdep2107ZJpylFkXY2W Mvr9eKXnJ0+GrD2NgwFXzbUrztOKeNS348YX35nA48bJS7BGKUh/xNlmIGiofMzd /NpazXoTewJy8FqU+qfR1kB28EtRDor8DNjrTFqiKD0fkoZOb7Fc4IxR/fVoSkOx pIf7n/BDtevZ8zJSKXJ+mdoYfSlnGZf+gm/QN5n0CPWJRZg0eyA8YAADK/sJRipJ O1j36alU0LXbZSR1W2n5uLZN3VLgdqyedHhdlMDWS816/wYar+h44kNQwtaxRtT8 rKEFTGvbOrMET9T+Bb0wxIF8ASQtW/JYx55jwFmx1212rV/5RXQXopt8PKZdwzDA zMSjKIyGgFHeoACC0+ne0AOU0zwvbVzKQdpAPQRtdxSbVev2ofqsDX2PSBusVvV4 s5hekxHzLuc+hZF4GDQE =U068 -----END PGP SIGNATURE----- --QmCE4f2q3Ulo0rgLRXJ25PEAQrLLvM8dD-- --===============7740616300208182815== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel --===============7740616300208182815==--