On Wed, Feb 04, 2015 at 08:34:04PM +0400, Andrey Korolyov wrote: > >Hi, > > > >I've seen the problem quite a few times. Before spending more time on > >it, I'd like to have a quick check here to see if anyone ever saw the > >same problem? Hope it is a relevant question with this mail list. > > > > > >Jul 2 11:08:21 arno-3 kernel: [ 2165.078623] BUG: unable to handle > >kernel NULL pointer dereference at 0000000000000008 > >Jul 2 11:08:21 arno-3 kernel: [ 2165.078916] IP: [<ffffffff8118d0fa>] > >copy_huge_page+0x8a/0x2a0 > >Jul 2 11:08:21 arno-3 kernel: [ 2165.079128] PGD 0 > >Jul 2 11:08:21 arno-3 kernel: [ 2165.079198] Oops: 0000 [#1] SMP > >Jul 2 11:08:21 arno-3 kernel: [ 2165.079319] Modules linked in: > >ip6table_filter ip6_tables ebtable_nat ebtables ipt_MASQUERADE > >iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 > >xt_state nf_conntrack ipt_REJECT xt_CHECKSUM iptable_mangle xt_tcpudp > >iptable_filter ip_tables x_tables kvm_intel kvm bridge stp llc ast ttm > >drm_kms_helper drm sysimgblt sysfillrect syscopyarea lp mei_me ioatdma > >ext2 parport mei shpchp dcdbas joydev mac_hid lpc_ich acpi_pad wmi > >hid_generic usbhid hid ixgbe igb dca i2c_algo_bit ahci ptp libahci > >mdio pps_core > >Jul 2 11:08:21 arno-3 kernel: [ 2165.081090] CPU: 19 PID: 3494 Comm: > >qemu-system-x86 Not tainted 3.11.0-15-generic #25~precise1-Ubuntu > >Jul 2 11:08:21 arno-3 kernel: [ 2165.081424] Hardware name: Dell Inc. > >PowerEdge C6220 II/09N44V, BIOS 2.0.3 07/03/2013 > >Jul 2 11:08:21 arno-3 kernel: [ 2165.081705] task: ffff881026750000 > >ti: ffff881026056000 task.ti: ffff881026056000 > >Jul 2 11:08:21 arno-3 kernel: [ 2165.081973] RIP: > >0010:[<ffffffff8118d0fa>] [<ffffffff8118d0fa>] > >copy_huge_page+0x8a/0x2a0 > > > Hello, > > sorry for possible top-posting, the same issue appears on at least > 3.10 LTS series. The original thread is at > http://marc.info/?l=kvm&m=14043742300901. Andrey, I am unable to access the URL above? > The necessary components for failure to reappear are a single running > kvm guest and mounted large thp: hugepagesz=1G (seemingly the same as > in initial report). With default 2M pages everything is working well, > the same for 3.18 with 1G THP. Are there any obvious clues for the > issue? > > Thanks! -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>