Messages in this thread | | | Date | Mon, 27 Aug 2018 11:48:11 +0200 | From | Pavel Machek <> | Subject | Re: [PATCH 1/3] x86, hibernate: Fix nosave_regions setup for hibernation |
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On Mon 2018-08-27 17:42:05, Gu Zhimin wrote: > From: Zhimin Gu <kookoo.gu@intel.com> > > On 32bit systems, nosave_regions(non RAM areas) located between > max_low_pfn and max_pfn are not excluded from hibernation snapshot > currently, which may result in a machine check exception when > trying to access these unsafe regions during hibernation: > > [ 612.800453] Disabling lock debugging due to kernel taint > [ 612.805786] mce: [Hardware Error]: CPU 0: Machine Check Exception: 5 Bank 6: fe00000000801136 > [ 612.814344] mce: [Hardware Error]: RIP !INEXACT! 60:<00000000d90be566> {swsusp_save+0x436/0x560} > [ 612.823167] mce: [Hardware Error]: TSC 1f5939fe276 ADDR dd000000 MISC 30e0000086 > [ 612.830677] mce: [Hardware Error]: PROCESSOR 0:306c3 TIME 1529487426 SOCKET 0 APIC 0 microcode 24 > [ 612.839581] mce: [Hardware Error]: Run the above through 'mcelog --ascii' > [ 612.846394] mce: [Hardware Error]: Machine check: Processor context corrupt > [ 612.853380] Kernel panic - not syncing: Fatal machine check > [ 612.858978] Kernel Offset: 0x18000000 from 0xc1000000 (relocation range: 0xc0000000-0xf7ffdfff) > > This is because on 32bit systems, pages above max_low_pfn are regarded > as high memeory, and accessing unsafe pages might cause expected MCE. > On the problematic 32bit system, there are reserved memory above low memory, > which triggered the MCE: > > e820 memory mapping: > [ 0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009d7ff] usable > [ 0.000000] BIOS-e820: [mem 0x000000000009d800-0x000000000009ffff] reserved > [ 0.000000] BIOS-e820: [mem 0x00000000000e0000-0x00000000000fffff] reserved > [ 0.000000] BIOS-e820: [mem 0x0000000000100000-0x00000000d160cfff] usable > [ 0.000000] BIOS-e820: [mem 0x00000000d160d000-0x00000000d1613fff] ACPI NVS > [ 0.000000] BIOS-e820: [mem 0x00000000d1614000-0x00000000d1a44fff] usable > [ 0.000000] BIOS-e820: [mem 0x00000000d1a45000-0x00000000d1ecffff] reserved > [ 0.000000] BIOS-e820: [mem 0x00000000d1ed0000-0x00000000d7eeafff] usable > [ 0.000000] BIOS-e820: [mem 0x00000000d7eeb000-0x00000000d7ffffff] reserved > [ 0.000000] BIOS-e820: [mem 0x00000000d8000000-0x00000000d875ffff] usable > [ 0.000000] BIOS-e820: [mem 0x00000000d8760000-0x00000000d87fffff] reserved > [ 0.000000] BIOS-e820: [mem 0x00000000d8800000-0x00000000d8fadfff] usable > [ 0.000000] BIOS-e820: [mem 0x00000000d8fae000-0x00000000d8ffffff] ACPI data > [ 0.000000] BIOS-e820: [mem 0x00000000d9000000-0x00000000da71bfff] usable > [ 0.000000] BIOS-e820: [mem 0x00000000da71c000-0x00000000da7fffff] ACPI NVS > [ 0.000000] BIOS-e820: [mem 0x00000000da800000-0x00000000dbb8bfff] usable > [ 0.000000] BIOS-e820: [mem 0x00000000dbb8c000-0x00000000dbffffff] reserved > [ 0.000000] BIOS-e820: [mem 0x00000000dd000000-0x00000000df1fffff] reserved > [ 0.000000] BIOS-e820: [mem 0x00000000f8000000-0x00000000fbffffff] reserved > [ 0.000000] BIOS-e820: [mem 0x00000000fec00000-0x00000000fec00fff] reserved > [ 0.000000] BIOS-e820: [mem 0x00000000fed00000-0x00000000fed03fff] reserved > [ 0.000000] BIOS-e820: [mem 0x00000000fed1c000-0x00000000fed1ffff] reserved > [ 0.000000] BIOS-e820: [mem 0x00000000fee00000-0x00000000fee00fff] reserved > [ 0.000000] BIOS-e820: [mem 0x00000000ff000000-0x00000000ffffffff] reserved > [ 0.000000] BIOS-e820: [mem 0x0000000100000000-0x000000041edfffff] usable > > Fix this problem by changing pfn limit from max_low_pfn to max_pfn. > This issue should also exist on 64bits systems, if there are reserved > regions above 4GB. > > Acked-by: Chen Yu <yu.c.chen@intel.com> > Signed-off-by: Zhimin Gu <kookoo.gu@intel.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
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