[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: [Xen-devel] xen-unstable: Xen BUG at sched_credit.c:925
(Note this is clean xen-unstable with no changes.) Well after compiling with debug=y, the following BUG is triggered during a different activity. (XEN) Xen call trace: (XEN) [<ffff82c480117a73>] csched_schedule+0xa8/0x557 (XEN) [<ffff82c48011c647>] schedule+0xd6/0x46a (XEN) [<ffff82c48011da20>] do_softirq+0x6a/0x77 (XEN) (XEN) (XEN) **************************************** (XEN) Panic on CPU 1: (XEN) Xen BUG at sched_credit.c:326 (XEN) **************************************** Looks like some memory corruption or something... maybe a free'd pointer that is used as if never freed. While this could be a tmem bug, tmem is so filled with asserts when debug=y is enabled that it is less likely (though certainly still possible). Very likely, tmem is churning otherwise unused memory a lot more than normal, surfacing a (non-tmem) latent bent pointer bug. This of course will be a real bear to track down, especially in code with which I am completely unfamiliar. Any ideas? Thanks, Dan > -----Original Message----- > From: Keir Fraser [mailto:keir.fraser@xxxxxxxxxxxxx] > Sent: Friday, November 13, 2009 10:16 AM > To: Dan Magenheimer; Xen-Devel (E-mail) > Subject: Re: [Xen-devel] xen-unstable: Xen BUG at sched_credit.c:925 > > > On 13/11/2009 17:04, "Dan Magenheimer" > <dan.magenheimer@xxxxxxxxxx> wrote: > > > I'm seeing this BUG/crash when shutting down a domain. > > I've only seen it when running a domain with tmem, though > > I'm not clear on what the relationship would be. > > > > I haven't tested tmem with xen-unstable for a couple of > > months now and I see five patches to sched_credit.c > > since Aug 25... should I just try backing those out, > > or any other ideas on what might be going on? The > > code around the BUG is not very intuitive to me > > and it looks like that chunk of code hasn't been > > changed for years. > > Worth a try, but I don't think any of those changesets are > likely to cause > this bug either. It's not a BUG() I've seen or had reported triggering > before. > > -- Keir > > > _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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