> -----Original Message----- > From: Sitsofe Wheeler > Sent: Wednesday, August 20, 2014 17:27 PM > To: Dexuan Cui > Cc: KY Srinivasan; Greg Kroah-Hartman; Haiyang Zhang; > devel@xxxxxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; Jean-Christophe > Plagniol-Villard; linux-fbdev@xxxxxxxxxxxxxxx > > While booting a Hyper-V 3.17.0-rc1 guest on a 2012 R2 host a BUG was > triggered while registering hyperv_fb which in turn caused a panic. > Various kernel debugging options (CONFIG_DEBUG_PAGEALLOC, > CONFIG_SLUB_DEBUG=y...) were on at the time. This only seems to happen > if the guest is being booted with only one CPU allocated to it. > > [ 7.645526] hv_vmbus: registering driver hyperv_fb > [ 7.657553] BUG: unable to handle kernel paging request at > ffff880077800004 > [ 7.658224] IP: [<ffffffff8159a7ac>] hv_ringbuffer_write+0x7c/0x150 > [ 7.658224] PGD 2da9067 PUD 2dac067 PMD 7fa27067 PTE > 8000000077800060 > [ 7.658224] Oops: 0000 [#1] SMP DEBUG_PAGEALLOC Hi Sitsofe, Thanks for reporting the issue! I suppose you're using the latest mainline v3.17-rc1(7d1311b9). Can you please attach your kernel config file so that I can try to reproduce the issue more easily? Do you mean the issue only happens to UP guest and doesn't happen to SMP guest? Thanks, -- Dexuan _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
