Hi all, While fuzzing with trinity inside a KVM tools guest running the latest -next kernel I've stumbled on the following: [ 3431.738346] WARNING: CPU: 12 PID: 17371 at arch/x86/mm/pat.c:781 untrack_pfn+0x65/0xb0() [ 3431.741153] Modules linked in: [ 3431.742138] CPU: 12 PID: 17371 Comm: trinity-c361 Not tainted 3.14.0-next-20140410-sasha-00022-gb3d9015-dirty #390 [ 3431.745365] 0000000000000009 ffff8801b5635be8 ffffffffae51f40b 0000000000005b10 [ 3431.747699] 0000000000000000 ffff8801b5635c28 ffffffffab15a37c ffff8801b5635c38 [ 3431.750401] ffff8802e8fd2e00 0000000000000000 ffff8801b5635d68 ffff8801b5635d68 [ 3431.752853] Call Trace: [ 3431.753625] dump_stack (lib/dump_stack.c:52) [ 3431.755244] warn_slowpath_common (kernel/panic.c:418) [ 3431.757062] warn_slowpath_null (kernel/panic.c:453) [ 3431.758828] untrack_pfn (arch/x86/mm/pat.c:781 (discriminator 3)) [ 3431.760785] unmap_single_vma (mm/memory.c:1316) [ 3431.762703] ? sched_clock (arch/x86/include/asm/paravirt.h:192 arch/x86/kernel/tsc.c:305) [ 3431.764366] ? sched_clock_local (kernel/sched/clock.c:214) [ 3431.766253] ? move_page_tables (mm/mremap.c:156 mm/mremap.c:217) [ 3431.768071] unmap_vmas (mm/memory.c:1366 (discriminator 1)) [ 3431.769686] unmap_region (mm/mmap.c:2361 (discriminator 3)) [ 3431.771776] ? validate_mm_rb (mm/mmap.c:401) [ 3431.773606] ? vma_rb_erase (mm/mmap.c:446 include/linux/rbtree_augmented.h:219 include/linux/rbtree_augmented.h:227 mm/mmap.c:485) [ 3431.775268] do_munmap (mm/mmap.c:3259 mm/mmap.c:2559) [ 3431.777012] move_vma (mm/mremap.c:306) [ 3431.778621] SyS_mremap (mm/mremap.c:439 mm/mremap.c:501 mm/mremap.c:470) [ 3431.780576] tracesys (arch/x86/kernel/entry_64.S:749) Thanks, Sasha -- 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>