[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] xen-4.6: xenstored crashes during domain->interface access
On Thu, 2016-01-28 at 09:50 +0100, Stefan Bader wrote: > On 26.01.2016 11:58, Stefan Bader wrote: > > 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 > > quickly > > 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- > > >interface > > 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 > > had 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 > > is. Does > > this happen for anybody else? Any advice what I should look at (in the > > sense of > > gathering better data)? > > Just as an update and confirmation for Ian and Bastian: Debian testing is > fine. > I have not dug into the specifics but its not the Xen package side at all. > Something in our 4.3 kernel causes this. Unfortunately without any hint in > dmesg. But since we move to 4.4 soon and I cannot reproduce it with the > pending > 4.4 build it seems good enough to me. Ah, this is probably fixed by 9c17d96500f78 "xen/gntdev: Grant maps should not be subject to NUMA balancing" then. Ian. _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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