mm,x86: warning at arch/x86/mm/pat.c:781 untrack_pfn+0x65/0xb0()

[Sasha Levin]

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
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