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[Xen-devel] [BUG] race condition in blkfront (probably other frontends t
| To: | Xen Development Mailing List <xen-devel@xxxxxxxxxxxxxxxxxxx> |
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| Subject: | [Xen-devel] [BUG] race condition in blkfront (probably other frontends too). |
| From: | Gerd Hoffmann <kraxel@xxxxxxxxxx> |
| Date: | Thu, 24 Jul 2008 16:15:07 +0200 |
| Delivery-date: | Thu, 24 Jul 2008 07:16:30 -0700 |
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Hi folks, I've just seen it with the block frontend, but most likely the other frontend drivers are affected too. The blkfront drivers goes into initialized state (in blkfront_probe), and *after* that xenbus_dev_probe sets a watch on the state node of the device. That leaves a race window open for the backend going into connected state before the watch is active. If that happens the frontend doesn't notice the backend is ready and never ever goes into connected state ... cheers, Gerd -- http://kraxel.fedorapeople.org/xenner/ _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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