[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] crash in is_xen_swiotlb_buffer
On Wed, 02 May 2012, Konrad Rzeszutek Wilk wrote: ...snip... > > [ 0.000000] Hardware name: PowerEdge R310 > > [ 0.000000] Modules linked in: > > [ 0.000000] Pid: 0, comm: swapper Not tainted 3.2.9 #9 > > [ 0.000000] Call Trace: > > [ 0.000000] [<c104236b>] ? warn_slowpath_common+0x6a/0x7b > > [ 0.000000] [<c1005442>] ? xen_mc_issue+0x34/0x62 > > [ 0.000000] [<c1042389>] ? warn_slowpath_null+0xd/0x10 > > [ 0.000000] [<c1005442>] ? xen_mc_issue+0x34/0x62 > > [ 0.000000] [<c1005f3b>] ? xen_set_pmd_hyper+0x3c/0x42 > > [ 0.000000] [<c102edbe>] ? set_pmd_pfn+0xde/0xf9 > > [ 0.000000] [<c168b652>] ? init_alloc_remap+0x1b3/0x216 > > [ 0.000000] [<c168aa48>] ? setup_node_data+0x4c/0x22f > > [ 0.000000] [<c168b203>] ? T.744+0x290/0x2c2 > > [ 0.000000] [<c168b2ac>] ? T.743+0x77/0x1a1 > > [ 0.000000] [<c1025290>] ? default_get_apic_id+0x14/0x33 > > [ 0.000000] [<c168b3ed>] ? initmem_init+0x5/0xb7 > > [ 0.000000] [<c167cef4>] ? setup_arch+0x5bf/0x694 > > [ 0.000000] [<c100b840>] ? __spin_time_accum+0x26/0x36 > > [ 0.000000] [<c167852c>] ? start_kernel+0x81/0x34d > > [ 0.000000] [<c167a258>] ? xen_start_kernel+0x554/0x55b > > [ 0.000000] ---[ end trace 4eaa2a86a8e2da22 ]--- > > So I've been able to reproduce this and it is due to CONFIG_NUMA=y > set on 32-bit builds. > > From a brief look, it looks as this is happening: > > /* perform actual remap */ > for (pfn = 0; pfn < size >> PAGE_SHIFT; pfn += PTRS_PER_PTE) > set_pmd_pfn((unsigned long)remap_va + (pfn << PAGE_SHIFT), > (node_pa >> PAGE_SHIFT) + pfn, > PAGE_KERNEL_LARGE); > > The PAGE_KERNEL_LARGE means that the PSE bit (so the 2MB) is set > which is a no-no. What is weird is that acpi_numa is disabled when booting > under Xen, but somehow this (which in my case was the 'fake_numa' code) > still gets turned on. Even doing 'numa=off' on the command line causes > this to appear. Thanks for the investigation, I'll turn off NUMA in my config. Goncalo _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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