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Subject: Re: General protection fault in `switch_mm_irqs_off()`
From:   Paul Menzel <pmenzel@molgen.mpg.de>
To:     x86@kernel.org
Cc:     LKML <linux-kernel@vger.kernel.org>
References: <784ab00e-ed72-c1bc-bc0c-31264deb7726@molgen.mpg.de>
Message-ID: <65b3aa5c-c11b-6435-5761-3f1489f18ce5@molgen.mpg.de>
Date:   Fri, 4 Jan 2019 13:41:25 +0100
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Dear Linux folks,


On 01/03/19 22:45, Paul Menzel wrote:

> On the server board Asus KGPE-D16 with AMD Opteron 6278 processor updat=
ing the microcode update in the firmware from 0x0600062e to 0x0600063e se=
ems to cause a general protection fault with Linux 4.14.87 and 4.20-rc7.
>=20
>> 46.859: [=C2=A0=C2=A0=C2=A0 7.573240] microcode: CPU31: patch_level=3D=
0x0600063e
>> 46.859: [=C2=A0=C2=A0=C2=A0 7.578507] microcode: Microcode Update Driv=
er: v2.2.
>> 46.860: [=C2=A0=C2=A0=C2=A0 7.578539] sched_clock: Marking stable (651=
0054745, 1068444659)->(7999876773, -421377369)
>> 46.860: [=C2=A0=C2=A0=C2=A0 7.593013] registered taskstats version 1
>> 46.861: [=C2=A0=C2=A0=C2=A0 7.598091] rtc_cmos 00:00: setting system c=
lock to 2000-01-01 08:01:51 UTC (946713711)
>> 46.862: [=C2=A0=C2=A0=C2=A0 7.606575] ALSA device list:
>> 46.862: [=C2=A0=C2=A0=C2=A0 7.609802]=C2=A0=C2=A0 No soundcards found.=

>> 46.865: [=C2=A0=C2=A0=C2=A0 7.615887] Freeing unused kernel image memo=
ry: 1564K
>> 46.871: [=C2=A0=C2=A0=C2=A0 7.627073] Write protecting the kernel read=
-only data: 20480k
>> 46.872: [=C2=A0=C2=A0=C2=A0 7.634366] Freeing unused kernel image memo=
ry: 2016K
>> 46.873: [=C2=A0=C2=A0=C2=A0 7.640297] Freeing unused kernel image memo=
ry: 584K
>> 46.874: [=C2=A0=C2=A0=C2=A0 7.645521] Run /init as init process
>> 46.877: [=C2=A0=C2=A0=C2=A0 7.652262] general protection fault: 0000 [=
#1] SMP NOPTI
>> 46.877: [=C2=A0=C2=A0=C2=A0 7.657931] CPU: 18 PID: 0 Comm: swapper/18 =
Not tainted 4.20.0-rc7.mx64.237 #1
>> 46.877: [=C2=A0=C2=A0=C2=A0 7.665514] Hardware name: ASUS KGPE-D16/KGP=
E-D16, BIOS 4.9-103-g637bef2037 01/02/2019
>> 46.878: [=C2=A0=C2=A0=C2=A0 7.673804] RIP: 0010:switch_mm_irqs_off+0xb=
2/0x640
>> 46.878: [=C2=A0=C2=A0=C2=A0 7.678948] Code: 48 c1 ef 09 83 e7 01 48 09=
 c7 65 48 8b 05 8e 34 fc 7e 48 39 c7 74 15 48 09 f8 a8 01 74 0e b9 49 00 =
00 00 b8 01 00 00 00 31 d2 <0f> 30 65 48 89 3d 6c 34 fc 7e 8b 05 9a ef a7=
 01 85 c0 0f 8f 41 04
>> 46.879: [=C2=A0=C2=A0=C2=A0 7.698394] RSP: 0018:ffffc90006343e20 EFLAG=
S: 00010046
>> 46.879: [=C2=A0=C2=A0=C2=A0 7.703844] RAX: 0000000000000001 RBX: ffff8=
8981ca0b800 RCX: 0000000000000049
>> 46.879: [=C2=A0=C2=A0=C2=A0 7.711238] RDX: 0000000000000000 RSI: ffff8=
8981b87cf80 RDI: ffff88981ca0b800
>> 46.880: [=C2=A0=C2=A0=C2=A0 7.718665] RBP: ffffc90006343e70 R08: 00000=
001c81bec00 R09: 0000000000000000
>> 46.880: [=C2=A0=C2=A0=C2=A0 7.726092] R10: ffffc90006343e88 R11: 00000=
00000000000 R12: ffffffff82479b40
>> 46.880: [=C2=A0=C2=A0=C2=A0 7.733494] R13: 0000000000000000 R14: 00000=
00000000012 R15: ffff88981dd50080
>> 46.881: [=C2=A0=C2=A0=C2=A0 7.740853] FS:=C2=A0 0000000000000000(0000)=
 GS:ffff88981fa80000(0000) knlGS:0000000000000000
>> 46.881: [=C2=A0=C2=A0=C2=A0 7.749318] CS:=C2=A0 0010 DS: 0000 ES: 0000=
 CR0: 0000000080050033
>> 46.881: [=C2=A0=C2=A0=C2=A0 7.755281] CR2: 0000000000000000 CR3: 00000=
0000240a000 CR4: 00000000000406e0
>> 46.881: [=C2=A0=C2=A0=C2=A0 7.762761] Call Trace:
>> 46.881: [=C2=A0=C2=A0=C2=A0 7.765369]=C2=A0 ? __schedule+0x1b9/0x7b0
>> 46.882: [=C2=A0=C2=A0=C2=A0 7.769253]=C2=A0 __schedule+0x1b9/0x7b0
>> 46.882: [=C2=A0=C2=A0=C2=A0 7.772930]=C2=A0 schedule_idle+0x1e/0x40
>> 46.882: [=C2=A0=C2=A0=C2=A0 7.776744]=C2=A0 do_idle+0x146/0x200
>> 46.882: [=C2=A0=C2=A0=C2=A0 7.780181]=C2=A0 cpu_startup_entry+0x19/0x2=
0
>> 46.883: [=C2=A0=C2=A0=C2=A0 7.784274]=C2=A0 start_secondary+0x183/0x1b=
0
>> 46.883: [=C2=A0=C2=A0=C2=A0 7.788409]=C2=A0 secondary_startup_64+0xa4/=
0xb0
>> 46.883: [=C2=A0=C2=A0=C2=A0 7.792766] Modules linked in:
>> 46.883: [=C2=A0=C2=A0=C2=A0 7.796105] ---[ end trace a423e363fe1ecf67 =
]---
>> 46.884: [=C2=A0=C2=A0=C2=A0 7.800939] RIP: 0010:switch_mm_irqs_off+0xb=
2/0x640
>> 46.884: [=C2=A0=C2=A0=C2=A0 7.806048] Code: 48 c1 ef 09 83 e7 01 48 09=
 c7 65 48 8b 05 8e 34 fc 7e 48 39 c7 74 15 48 09 f8 a8 01 74 0e b9 49 00 =
00 00 b8 01 00 00 00 31 d2 <0f> 30 65 48 89 3d 6c 34 fc 7e 8b 05 9a ef a7=
 01 85 c0 0f 8f 41 04
>> 46.884: [=C2=A0=C2=A0=C2=A0 7.825440] RSP: 0018:ffffc90006343e20 EFLAG=
S: 00010046
>> 46.885: [=C2=A0=C2=A0=C2=A0 7.830855] RAX: 0000000000000001 RBX: ffff8=
8981ca0b800 RCX: 0000000000000049
>> 46.885: [=C2=A0=C2=A0=C2=A0 7.838230] RDX: 0000000000000000 RSI: ffff8=
8981b87cf80 RDI: ffff88981ca0b800
>> 46.885: [=C2=A0=C2=A0=C2=A0 7.845614] RBP: ffffc90006343e70 R08: 00000=
001c81bec00 R09: 0000000000000000
>> 46.886: [=C2=A0=C2=A0=C2=A0 7.853047] R10: ffffc90006343e88 R11: 00000=
00000000000 R12: ffffffff82479b40
>> 46.886: [=C2=A0=C2=A0=C2=A0 7.860427] R13: 0000000000000000 R14: 00000=
00000000012 R15: ffff88981dd50080
>> 46.886: [=C2=A0=C2=A0=C2=A0 7.867862] FS:=C2=A0 0000000000000000(0000)=
 GS:ffff88981fa80000(0000) knlGS:0000000000000000
>> 46.886: [=C2=A0=C2=A0=C2=A0 7.876320] CS:=C2=A0 0010 DS: 0000 ES: 0000=
 CR0: 0000000080050033
>> 46.887: [=C2=A0=C2=A0=C2=A0 7.882351] CR2: 0000000000000000 CR3: 00000=
0000240a000 CR4: 00000000000406e0
>> 46.887: [=C2=A0=C2=A0=C2=A0 7.889746] Kernel panic - not syncing: Atte=
mpted to kill the idle task!
>> 46.888: [=C2=A0=C2=A0=C2=A0 7.896907] Kernel Offset: disabled
>> 46.888: [=C2=A0=C2=A0=C2=A0 7.900558] ---[ end Kernel panic - not sync=
ing: Attempted to kill the idle task! ]---
>=20
> Please find the whole log, including the coreboot messages, attached. T=
he time stamps in the beginning are from the script `readserial.py` from =
the SeaBIOS repository.
>=20
> Do you have an idea what is going on, and how to fix it?

Decoding the code, give the output below.

```
$ scripts/decodecode < /dev/shm/test.log=20
[ 7.806048] Code: 48 c1 ef 09 83 e7 01 48 09 c7 65 48 8b 05 8e 34 fc 7e 4=
8 39 c7 74 15 48 09 f8 a8 01 74 0e b9 49 00 00 00 b8 01 00 00 00 31 d2 <0=
f> 30 65 48 89 3d 6c 34 fc 7e 8b 05 9a ef a7 01 85 c0 0f 8f 41 04
All code
=3D=3D=3D=3D=3D=3D=3D=3D
   0:	48 c1 ef 09          	shr    $0x9,%rdi
   4:	83 e7 01             	and    $0x1,%edi
   7:	48 09 c7             	or     %rax,%rdi
   a:	65 48 8b 05 8e 34 fc 	mov    %gs:0x7efc348e(%rip),%rax        # 0x7=
efc34a0
  11:	7e=20
  12:	48 39 c7             	cmp    %rax,%rdi
  15:	74 15                	je     0x2c
  17:	48 09 f8             	or     %rdi,%rax
  1a:	a8 01                	test   $0x1,%al
  1c:	74 0e                	je     0x2c
  1e:	b9 49 00 00 00       	mov    $0x49,%ecx
  23:	b8 01 00 00 00       	mov    $0x1,%eax
  28:	31 d2                	xor    %edx,%edx
  2a:*	0f 30                	wrmsr  		<-- trapping instruction
  2c:	65 48 89 3d 6c 34 fc 	mov    %rdi,%gs:0x7efc346c(%rip)        # 0x7=
efc34a0
  33:	7e=20
  34:	8b 05 9a ef a7 01    	mov    0x1a7ef9a(%rip),%eax        # 0x1a7efd=
4
  3a:	85 c0                	test   %eax,%eax
  3c:	0f                   	.byte 0xf
  3d:	8f 41 04             	popq   0x4(%rcx)

Code starting with the faulting instruction
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
   0:	0f 30                	wrmsr =20
   2:	65 48 89 3d 6c 34 fc 	mov    %rdi,%gs:0x7efc346c(%rip)        # 0x7=
efc3476
   9:	7e=20
   a:	8b 05 9a ef a7 01    	mov    0x1a7ef9a(%rip),%eax        # 0x1a7efa=
a
  10:	85 c0                	test   %eax,%eax
  12:	0f                   	.byte 0xf
  13:	8f 41 04             	popq   0x4(%rcx)
```

So the problem is with the instruction *wrmsr* [1].

The content of ECX, which according to [1] is written to, is not
in the logs though, as far as I can see.


Kind regards,

Paul


[1]: https://www.felixcloutier.com/x86/wrmsr


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