linux-kernel - Re: [PATCH v4 RESEND 4/11] x86/asm: Fix pud/pmd interfaces to handle large PAT bit

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Message-ID: <5640E08F.5020206@oracle.com>
Date:	Mon, 9 Nov 2015 13:06:07 -0500
From:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:	Toshi Kani <toshi.kani@....com>, hpa@...or.com, tglx@...utronix.de,
	mingo@...hat.com
Cc:	akpm@...ux-foundation.org, bp@...en8.de, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, x86@...nel.org, jgross@...e.com,
	konrad.wilk@...cle.com, elliott@....com
Subject: Re: [PATCH v4 RESEND 4/11] x86/asm: Fix pud/pmd interfaces to handle
 large PAT bit

On 09/17/2015 02:24 PM, Toshi Kani wrote:
> Now that we have pud/pmd mask interfaces, which handle pfn & flags
> mask properly for the large PAT bit.
>
> Fix pud/pmd pfn & flags interfaces by replacing PTE_PFN_MASK and
> PTE_FLAGS_MASK with the pud/pmd mask interfaces.
>
> Suggested-by: Juergen Gross <jgross@...e.com>
> Signed-off-by: Toshi Kani <toshi.kani@....com>
> Cc: Juergen Gross <jgross@...e.com>
> Cc: Konrad Wilk <konrad.wilk@...cle.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: H. Peter Anvin <hpa@...or.com>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Borislav Petkov <bp@...en8.de>
> ---
>   arch/x86/include/asm/pgtable.h       |   14 ++++++++------
>   arch/x86/include/asm/pgtable_types.h |    4 ++--
>   2 files changed, 10 insertions(+), 8 deletions(-)
>


Looks like this commit is causing this splat for 32-bit kernels. I am 
attaching my config file, just in case.

-boris


[    8.905943] page:eea45000 count:0 mapcount:-128 mapping:  (null) index:0x0
[    8.913041] flags: 0x40000000()
[    8.916293] page dumped because: VM_BUG_ON_PAGE(page_mapcount(page) < 0)
[    8.923204] ------------[ cut here ]------------
[    8.927958] kernel BUG at /home/build/linux-boris/mm/huge_memory.c:1485!
[    8.934860] invalid opcode: 0000 [#1] SMP
[    8.939094] Modules linked in: ahci libahci ata_generic skge r8169 firewire_ohci mii libata qla2xxx(+) scsi_transport_fc scsi_mod radeon tpm_infineon ttm backlight wmi acpi_cpufreq tpm_tis
[    8.956548] CPU: 2 PID: 1758 Comm: modprobe Not tainted 4.3.0upstream-09269-gce5c2d2 #1
[    8.964792] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./To be filled by O.E.M., BIOS 080014  07/18/2008
[    8.975991] task: ed84e600 ti: f6458000 task.ti: f6458000
[    8.981552] EIP: 0060:[<c11bde80>] EFLAGS: 00010246 CPU: 2
[    8.987203] EIP is at zap_huge_pmd+0x240/0x260
[    8.991778] EAX: 00000000 EBX: f6459eb0 ECX: 00000292 EDX: 00000292
[    8.998234] ESI: f6634d98 EDI: eea45000 EBP: f6459dc8 ESP: f6459d98
[    8.998355] ata1: SATA link down (SStatus 0 SControl 300)
[    9.000330] ata2: SATA link down (SStatus 0 SControl 300)
[    9.015804]  DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
[    9.021364] CR0: 8005003b CR2: b75b21a0 CR3: 3655b880 CR4: 000006f0
[    9.027818] Stack:
[    9.029885]  00000080 00000000 80000002 ee795000 80000002 ffe00000 00000000 ffffff7f
[    9.037930]  eee6169c f70c5e40 b6600000 f6634d98 f6459e78 c119a7c8 b6600000 80000002
[    9.045972]  00000003 c18992f4 c18992f0 00000003 00000286 f6459e0c c10db5f0 00000000
[    9.054018] Call Trace:
[    9.056537]  [<c119a7c8>] unmap_single_vma+0x6e8/0x7c0
[    9.061829]  [<c10db5f0>] ? __wake_up+0x40/0x50
[    9.063587] firewire_core 0000:08:05.0: created device fw0: GUID 000000001a1a2f03, S800
[    9.074736]  [<c119a8e7>] unmap_vmas+0x47/0x80
[    9.079312]  [<c11a0c44>] unmap_region+0x74/0xc0
[    9.084067]  [<c11a2d50>] do_munmap+0x1b0/0x280
[    9.088732]  [<c11a2e58>] vm_munmap+0x38/0x50
[    9.093218]  [<c11a2e88>] SyS_munmap+0x18/0x20
[    9.097795]  [<c1003861>] do_fast_syscall_32+0xa1/0x270
[    9.103176]  [<c1095400>] ? __do_page_fault+0x430/0x430
[    9.108559]  [<c169de51>] sysenter_past_esp+0x36/0x55
[    9.113761] Code: 00 e9 05 fe ff ff 90 8d 74 26 00 0f 0b eb fe ba 4c e1 7a c1 89 f8 e8 f0 91 fd ff 0f 0b eb fe ba 6c e1 7a c1 89 f8 e8 e0 91 fd ff <0f> 0b eb fe ba c4 e1 7a c1 89 f8 e8 d0 91 fd ff 0f 0b eb fe 8d
[    9.133727] EIP: [<c11bde80>] zap_huge_pmd+0x240/0x260 SS:ESP 0068:f6459d98
[    9.140929] ---[ end trace cba8fb1fc2e2e78a ]---
[    9.143363] scsi host5: qla2xxx
[    9.148416] qla2xxx [0000:04:07.1]-00fb:5: QLogic QLE2362 - PCI-Express to 2Gb FC, Dual Channel.
[    9.148420] qla2xxx [0000:04:07.1]-00fc:5: ISP2322: PCI-X (133 MHz) @ 0000:04:07.1 hdma+ host#=5 fw=3.03.28 IPX.
[    9.152282] ata4: softreset failed (device not ready)
[    9.152284] ata4: applying PMP SRST workaround and retrying
[    9.153282] ata3: softreset failed (device not ready)
[    9.153284] ata3: applying PMP SRST workaround and retrying
[    9.190361] Kernel panic - not syncing: Fatal exception
[    9.195764] Kernel Offset: disabled
[    9.199354] ---[ end Kernel panic - not syncing: Fatal exception



View attachment "32b.config" of type "text/plain" (99760 bytes)