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From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Andy Lutomirski <luto@kernel.org>
Cc: Dmitry Vyukov <dvyukov@google.com>,
	Andrey Ryabinin <aryabinin@virtuozzo.com>,
	Alexander Potapenko <glider@google.com>,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	"x86@kernel.org" <x86@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
	Andi Kleen <ak@linux.intel.com>,
	Dave Hansen <dave.hansen@intel.com>,
	linux-arch <linux-arch@vger.kernel.org>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	LKML <linux-kernel@vger.kernel.org>,
	kasan-dev <kasan-dev@googlegroups.com>
Subject: Re: KASAN vs. boot-time switching between 4- and 5-level paging
Date: Tue, 11 Jul 2017 13:35:48 +0300	[thread overview]
Message-ID: <20170711103548.mkv5w7dd5gpdenne@node.shutemov.name> (raw)
In-Reply-To: <CALCETrW6pWzpdf1MVx_ytaYYuVGBsF7R+JowEsKqd3i=vCwJ_w@mail.gmail.com>

On Mon, Jul 10, 2017 at 05:30:38PM -0700, Andy Lutomirski wrote:
> On Mon, Jul 10, 2017 at 2:24 PM, Kirill A. Shutemov
> <kirill@shutemov.name> wrote:
> > On Mon, Jul 10, 2017 at 01:07:13PM -0700, Andy Lutomirski wrote:
> >> Can you give the disassembly of the backtrace lines?  Blaming the
> >> .endr doesn't make much sense to me.
> >
> > I don't have backtrace. It's before printk() is functional. I only see
> > triple fault and reboot.
> >
> > I had to rely on qemu tracing and gdb.
> 
> Can you ask GDB or objtool to disassemble around those addresses?  Can
> you also attach the big dump that QEMU throws out that shows register
> state?  In particular, CR2, CR3, and CR4 could be useful.

The last three execptions:

check_exception old: 0xffffffff new 0xe, cr2: 0xffffffff7ffffff8, rip: 0xffffffff84bb3036
RAX=00000000ffffffff RBX=ffffffff800000d8 RCX=ffffffff84be4021 RDX=dffffc0000000000
RSI=0000000000000006 RDI=ffffffff84c57000 RBP=ffffffff800000c8 RSP=ffffffff80000000
R8 =6d756e2032616476 R9 =2f7665642f3d746f R10=6f72203053797474 R11=3d656c6f736e6f63
R12=0000000000000006 R13=000000003fffb000 R14=ffffffff82a07ed8 R15=000000000140008e
RIP=ffffffff84bb3036 RFL=00000006 [-----P-] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0000 0000000000000000 00000000 00000000
CS =0010 0000000000000000 ffffffff 00af9b00 DPL=0 CS64 [-RA]
SS =0000 0000000000000000 ffffffff 00c09300 DPL=0 DS   [-WA]
DS =0000 0000000000000000 00000000 00000000
FS =0000 0000000000000000 00000000 00000000
GS =0000 ffffffff84b8f000 00000000 00000000
LDT=0000 0000000000000000 0000ffff 00008200 DPL=0 LDT
TR =0000 0000000000000000 0000ffff 00008b00 DPL=0 TSS64-busy
GDT=     ffffffff84ba1000 0000007f
IDT=     ffffffff84d92000 00000fff
CR0=80050033 CR2=ffffffff7ffffff8 CR3=0000000009c58000 CR4=000010a0
DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000
DR6=00000000ffff0ff0 DR7=0000000000000400
EFER=0000000000000d01

check_exception old: 0xe new 0xe, cr2: 0xffffffff7ffffff8, rip: 0xffffffff84bb3141
RAX=00000000ffffffff RBX=ffffffff800000d8 RCX=ffffffff84be4021 RDX=dffffc0000000000
RSI=0000000000000006 RDI=ffffffff84c57000 RBP=ffffffff800000c8 RSP=ffffffff80000000
R8 =6d756e2032616476 R9 =2f7665642f3d746f R10=6f72203053797474 R11=3d656c6f736e6f63
R12=0000000000000006 R13=000000003fffb000 R14=ffffffff82a07ed8 R15=000000000140008e
RIP=ffffffff84bb3141 RFL=00000006 [-----P-] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0000 0000000000000000 00000000 00000000
CS =0010 0000000000000000 ffffffff 00af9b00 DPL=0 CS64 [-RA]
SS =0000 0000000000000000 ffffffff 00c09300 DPL=0 DS   [-WA]
DS =0000 0000000000000000 00000000 00000000
FS =0000 0000000000000000 00000000 00000000
GS =0000 ffffffff84b8f000 00000000 00000000
LDT=0000 0000000000000000 0000ffff 00008200 DPL=0 LDT
TR =0000 0000000000000000 0000ffff 00008b00 DPL=0 TSS64-busy
GDT=     ffffffff84ba1000 0000007f
IDT=     ffffffff84d92000 00000fff
CR0=80050033 CR2=ffffffff7ffffff8 CR3=0000000009c58000 CR4=000010a0
DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000
DR6=00000000ffff0ff0 DR7=0000000000000400
EFER=0000000000000d01

check_exception old: 0x8 new 0xe, cr2: 0xffffffff7ffffff8, rip: 0xffffffff84bb3141
RAX=00000000ffffffff RBX=ffffffff800000d8 RCX=ffffffff84be4021 RDX=dffffc0000000000
RSI=0000000000000006 RDI=ffffffff84c57000 RBP=ffffffff800000c8 RSP=ffffffff80000000
R8 =6d756e2032616476 R9 =2f7665642f3d746f R10=6f72203053797474 R11=3d656c6f736e6f63
R12=0000000000000006 R13=000000003fffb000 R14=ffffffff82a07ed8 R15=000000000140008e
RIP=ffffffff84bb3141 RFL=00000006 [-----P-] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0000 0000000000000000 00000000 00000000
CS =0010 0000000000000000 ffffffff 00af9b00 DPL=0 CS64 [-RA]
SS =0000 0000000000000000 ffffffff 00c09300 DPL=0 DS   [-WA]
DS =0000 0000000000000000 00000000 00000000
FS =0000 0000000000000000 00000000 00000000
GS =0000 ffffffff84b8f000 00000000 00000000
LDT=0000 0000000000000000 0000ffff 00008200 DPL=0 LDT
TR =0000 0000000000000000 0000ffff 00008b00 DPL=0 TSS64-busy
GDT=     ffffffff84ba1000 0000007f
IDT=     ffffffff84d92000 00000fff
CR0=80050033 CR2=ffffffff7ffffff8 CR3=0000000009c58000 CR4=000010a0
DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000
DR6=00000000ffff0ff0 DR7=0000000000000400
EFER=0000000000000d01
Triple fault

Dump of assembler code for function early_idt_handler_array:
   0xffffffff84bb3000 <+0>:     pushq  $0x0
   0xffffffff84bb3002 <+2>:     pushq  $0x0
   0xffffffff84bb3004 <+4>:     jmpq   0xffffffff84bb3120 <early_idt_handler_common>
   0xffffffff84bb3009 <+9>:     pushq  $0x0
   0xffffffff84bb300b <+11>:    pushq  $0x1
   0xffffffff84bb300d <+13>:    jmpq   0xffffffff84bb3120 <early_idt_handler_common>
   0xffffffff84bb3012 <+18>:    pushq  $0x0
   0xffffffff84bb3014 <+20>:    pushq  $0x2
   0xffffffff84bb3016 <+22>:    jmpq   0xffffffff84bb3120 <early_idt_handler_common>
   0xffffffff84bb301b <+27>:    pushq  $0x0
   0xffffffff84bb301d <+29>:    pushq  $0x3
   0xffffffff84bb301f <+31>:    jmpq   0xffffffff84bb3120 <early_idt_handler_common>
   0xffffffff84bb3024 <+36>:    pushq  $0x0
   0xffffffff84bb3026 <+38>:    pushq  $0x4
   0xffffffff84bb3028 <+40>:    jmpq   0xffffffff84bb3120 <early_idt_handler_common>
   0xffffffff84bb302d <+45>:    pushq  $0x0
   0xffffffff84bb302f <+47>:    pushq  $0x5
   0xffffffff84bb3031 <+49>:    jmpq   0xffffffff84bb3120 <early_idt_handler_common>
=> 0xffffffff84bb3036 <+54>:    pushq  $0x0
   0xffffffff84bb3038 <+56>:    pushq  $0x6
   0xffffffff84bb303a <+58>:    jmpq   0xffffffff84bb3120 <early_idt_handler_common>
   0xffffffff84bb303f <+63>:    pushq  $0x0
   0xffffffff84bb3041 <+65>:    pushq  $0x7
   0xffffffff84bb3043 <+67>:    jmpq   0xffffffff84bb3120 <early_idt_handler_common>
   0xffffffff84bb3048 <+72>:    pushq  $0x8
   0xffffffff84bb304a <+74>:    jmpq   0xffffffff84bb3120 <early_idt_handler_common>
   0xffffffff84bb304f <+79>:    int3
   0xffffffff84bb3050 <+80>:    int3
...

-- 
 Kirill A. Shutemov

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  reply	other threads:[~2017-07-11 10:35 UTC|newest]

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-05-25 20:33 [PATCHv1, RFC 0/8] Boot-time switching between 4- and 5-level paging Kirill A. Shutemov
2017-05-25 20:33 ` [PATCHv1, RFC 1/8] x86/boot/compressed/64: Detect and handle 5-level paging at boot-time Kirill A. Shutemov
2017-05-25 20:33 ` [PATCHv1, RFC 2/8] x86/mm: Make virtual memory layout movable for CONFIG_X86_5LEVEL Kirill A. Shutemov
2017-05-25 20:33 ` [PATCHv1, RFC 3/8] x86/mm: Make PGDIR_SHIFT and PTRS_PER_P4D variable Kirill A. Shutemov
2017-05-25 20:33 ` [PATCHv1, RFC 4/8] x86/mm: Handle boot-time paging mode switching at early boot Kirill A. Shutemov
2017-05-25 20:33 ` [PATCHv1, RFC 5/8] x86/mm: Fold p4d page table layer at runtime Kirill A. Shutemov
2017-05-27 15:09   ` Brian Gerst
2017-05-27 22:46     ` Kirill A. Shutemov
2017-05-27 22:56       ` Brian Gerst
2017-05-25 20:33 ` [PATCHv1, RFC 6/8] x86/mm: Replace compile-time checks for 5-level with runtime-time Kirill A. Shutemov
2017-05-25 20:33 ` [PATCHv1, RFC 7/8] x86/mm: Hacks for boot-time switching between 4- and 5-level paging Kirill A. Shutemov
2017-05-26 22:10   ` KASAN vs. " Kirill A. Shutemov
2017-05-29 10:02     ` Dmitry Vyukov
2017-05-29 11:18       ` Andrey Ryabinin
2017-05-29 11:19         ` Dmitry Vyukov
2017-05-29 11:45           ` Andrey Ryabinin
2017-05-29 12:46             ` Andrey Ryabinin
2017-06-01 14:56               ` Andrey Ryabinin
2017-07-10 12:33                 ` Kirill A. Shutemov
2017-07-10 12:43                   ` Dmitry Vyukov
2017-07-10 14:17                     ` Kirill A. Shutemov
2017-07-10 15:56                       ` Andy Lutomirski
2017-07-10 18:47                         ` Kirill A. Shutemov
2017-07-10 20:07                           ` Andy Lutomirski
2017-07-10 21:24                             ` Kirill A. Shutemov
2017-07-11  0:30                               ` Andy Lutomirski
2017-07-11 10:35                                 ` Kirill A. Shutemov [this message]
2017-07-11 15:06                                   ` Andy Lutomirski
2017-07-11 15:15                                     ` Andrey Ryabinin
2017-07-11 16:45                                       ` Andrey Ryabinin
2017-07-11 17:03                                         ` Kirill A. Shutemov
2017-07-11 17:29                                           ` Andrey Ryabinin
2017-07-11 19:05                                             ` Kirill A. Shutemov
2017-07-13 12:58                                               ` Andrey Ryabinin
2017-07-13 13:52                                                 ` Kirill A. Shutemov
2017-07-13 14:15                                                   ` Kirill A. Shutemov
2017-07-13 14:19                                                     ` Andrey Ryabinin
2017-07-24 12:13                                                       ` Kirill A. Shutemov
2017-07-24 14:07                                                         ` Andrey Ryabinin
2017-07-10 16:57                   ` Andrey Ryabinin
2017-05-25 20:33 ` [PATCHv1, RFC 8/8] x86/mm: Allow to boot without la57 if CONFIG_X86_5LEVEL=y Kirill A. Shutemov
2017-05-25 23:24 ` [PATCHv1, RFC 0/8] Boot-time switching between 4- and 5-level paging Linus Torvalds
2017-05-26  0:40   ` Andy Lutomirski
2017-05-26  4:18     ` Kevin Easton
2017-05-26  7:21       ` Andy Lutomirski
2017-05-26 13:00   ` Kirill A. Shutemov
2017-05-26 13:35     ` Andi Kleen
2017-05-26 15:51     ` Linus Torvalds
2017-05-26 15:58       ` Kirill A. Shutemov
2017-05-26 16:13         ` Linus Torvalds
2017-05-26 18:24       ` hpa
2017-05-26 19:23         ` Dave Hansen
2017-05-26 19:36           ` hpa
2017-05-26 19:40     ` hpa

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