linux-kernel - Re: Kernel 6.9 regression: X86: Bogus messages from topology detection

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Date: Fri, 31 May 2024 15:08:53 +0200
From: Christian Heusel <christian@...sel.eu>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: Peter Schneider <pschneider1968@...glemail.com>, 
	LKML <linux-kernel@...r.kernel.org>, x86@...nel.org, stable@...r.kernel.org, 
	regressions@...ts.linux.dev
Subject: Re: Kernel 6.9 regression: X86: Bogus messages from topology
 detection

On 24/05/31 11:11AM, Thomas Gleixner wrote:
> On Fri, May 31 2024 at 10:48, Thomas Gleixner wrote:
> 
> It seems there are two different issues here. The dmesg you provided is
> from a i7-1255U, which is a hybrid CPU. The i7-7700k has 4 cores (8
> threads) and there is not necessarily the same root cause.

It seems like I was also below my needed caffeine levels :p The person
reporting (in the same thread) with the i7-7700k reports the problem
fixed[1] as well, so this is in line with Peters observerations!

The other person with the i7-1255U in the meantime got back to me with
the needed outputs:

> Can I get:
>
> - dmesg from 6.8.y kernel

See attachment (dmesg6.8.9-arch1-2.log)

> - output of cpuid -r

Basic Leafs :
================
0x00000000: EAX=0x00000020, EBX=0x756e6547, ECX=0x6c65746e, EDX=0x49656e69
0x00000001: EAX=0x000906a4, EBX=0x12400800, ECX=0x7ffafbff, EDX=0xbfebfbff
0x00000002: EAX=0x00feff01, EBX=0x00000000, ECX=0x00000000, EDX=0x00000000
0x00000004: subleafs:
  0: EAX=0x7c004121, EBX=0x01c0003f, ECX=0x0000003f, EDX=0x00000000
  1: EAX=0x7c004122, EBX=0x01c0003f, ECX=0x0000007f, EDX=0x00000000
  2: EAX=0x7c01c143, EBX=0x03c0003f, ECX=0x000007ff, EDX=0x00000000
  3: EAX=0x7c0fc163, EBX=0x02c0003f, ECX=0x00003fff, EDX=0x00000004
0x00000005: EAX=0x00000040, EBX=0x00000040, ECX=0x00000003, EDX=0x10102020
0x00000006: EAX=0x00df8ff7, EBX=0x00000002, ECX=0x00000409, EDX=0x00020003
0x00000007: subleafs:
  0: EAX=0x00000002, EBX=0x239ca7eb, ECX=0x984007bc, EDX=0xfc18c410
  1: EAX=0x00400810, EBX=0x00000000, ECX=0x00000000, EDX=0x00040000
  2: EAX=0x00000000, EBX=0x00000000, ECX=0x00000000, EDX=0x00000017
0x0000000a: EAX=0x07300605, EBX=0x00000000, ECX=0x00000007, EDX=0x00008603
0x0000000b: subleafs:
  0: EAX=0x00000001, EBX=0x00000001, ECX=0x00000100, EDX=0x00000012
  1: EAX=0x00000006, EBX=0x0000000c, ECX=0x00000201, EDX=0x00000012
0x0000000d: subleafs:
  0: EAX=0x00000207, EBX=0x00000a88, ECX=0x00000a88, EDX=0x00000000
  1: EAX=0x0000000f, EBX=0x00000680, ECX=0x00009900, EDX=0x00000000
  2: EAX=0x00000100, EBX=0x00000240, ECX=0x00000000, EDX=0x00000000
  8: EAX=0x00000080, EBX=0x00000000, ECX=0x00000001, EDX=0x00000000
  9: EAX=0x00000008, EBX=0x00000a80, ECX=0x00000000, EDX=0x00000000
 11: EAX=0x00000010, EBX=0x00000000, ECX=0x00000001, EDX=0x00000000
 12: EAX=0x00000018, EBX=0x00000000, ECX=0x00000001, EDX=0x00000000
 15: EAX=0x00000328, EBX=0x00000000, ECX=0x00000001, EDX=0x00000000
0x00000010: subleafs:
  0: EAX=0x00000000, EBX=0x00000004, ECX=0x00000000, EDX=0x00000000
  2: EAX=0x0000000f, EBX=0x00000000, ECX=0x00000004, EDX=0x0000000f
0x00000014: subleafs:
  0: EAX=0x00000001, EBX=0x0000005f, ECX=0x80000007, EDX=0x00000000
  1: EAX=0x02490002, EBX=0x003f003f, ECX=0x00000000, EDX=0x00000000
0x00000015: EAX=0x00000002, EBX=0x00000088, ECX=0x0249f000, EDX=0x00000000
0x00000016: EAX=0x00000a28, EBX=0x00000dac, ECX=0x00000064, EDX=0x00000000
0x00000018: subleafs:
  0: EAX=0x00000004, EBX=0x00000000, ECX=0x00000000, EDX=0x00000000
  1: EAX=0x00000000, EBX=0x00300001, ECX=0x00000001, EDX=0x00000121
  2: EAX=0x00000000, EBX=0x00040003, ECX=0x00000200, EDX=0x00000043
  3: EAX=0x00000000, EBX=0x00400001, ECX=0x00000001, EDX=0x00000122
  4: EAX=0x00000000, EBX=0x00080008, ECX=0x00000001, EDX=0x00000143
0x0000001a: EAX=0x20000001, EBX=0x00000000, ECX=0x00000000, EDX=0x00000000
0x0000001c: EAX=0xc000000b, EBX=0x00000007, ECX=0x00000007, EDX=0x00000000
0x0000001f: subleafs:
  0: EAX=0x00000001, EBX=0x00000001, ECX=0x00000100, EDX=0x00000012
  1: EAX=0x00000007, EBX=0x0000000c, ECX=0x00000201, EDX=0x00000012
  2: EAX=0x00000000, EBX=0x00000000, ECX=0x00000002, EDX=0x00000012
  3: EAX=0x00000000, EBX=0x00000000, ECX=0x00000003, EDX=0x00000012
  4: EAX=0x00000000, EBX=0x00000000, ECX=0x00000004, EDX=0x00000012
  5: EAX=0x00000000, EBX=0x00000000, ECX=0x00000005, EDX=0x00000012
  6: EAX=0x00000000, EBX=0x00000000, ECX=0x00000006, EDX=0x00000012
  7: EAX=0x00000000, EBX=0x00000000, ECX=0x00000007, EDX=0x00000012
  8: EAX=0x00000000, EBX=0x00000000, ECX=0x00000008, EDX=0x00000012
  9: EAX=0x00000000, EBX=0x00000000, ECX=0x00000009, EDX=0x00000012
 10: EAX=0x00000000, EBX=0x00000000, ECX=0x0000000a, EDX=0x00000012
 11: EAX=0x00000000, EBX=0x00000000, ECX=0x0000000b, EDX=0x00000012
 12: EAX=0x00000000, EBX=0x00000000, ECX=0x0000000c, EDX=0x00000012
 13: EAX=0x00000000, EBX=0x00000000, ECX=0x0000000d, EDX=0x00000012
 14: EAX=0x00000000, EBX=0x00000000, ECX=0x0000000e, EDX=0x00000012
 15: EAX=0x00000000, EBX=0x00000000, ECX=0x0000000f, EDX=0x00000012
 16: EAX=0x00000000, EBX=0x00000000, ECX=0x00000010, EDX=0x00000012
 17: EAX=0x00000000, EBX=0x00000000, ECX=0x00000011, EDX=0x00000012
 18: EAX=0x00000000, EBX=0x00000000, ECX=0x00000012, EDX=0x00000012
 19: EAX=0x00000000, EBX=0x00000000, ECX=0x00000013, EDX=0x00000012
 20: EAX=0x00000000, EBX=0x00000000, ECX=0x00000014, EDX=0x00000012
 21: EAX=0x00000000, EBX=0x00000000, ECX=0x00000015, EDX=0x00000012
 22: EAX=0x00000000, EBX=0x00000000, ECX=0x00000016, EDX=0x00000012
 23: EAX=0x00000000, EBX=0x00000000, ECX=0x00000017, EDX=0x00000012
 24: EAX=0x00000000, EBX=0x00000000, ECX=0x00000018, EDX=0x00000012
 25: EAX=0x00000000, EBX=0x00000000, ECX=0x00000019, EDX=0x00000012
 26: EAX=0x00000000, EBX=0x00000000, ECX=0x0000001a, EDX=0x00000012
 27: EAX=0x00000000, EBX=0x00000000, ECX=0x0000001b, EDX=0x00000012
 28: EAX=0x00000000, EBX=0x00000000, ECX=0x0000001c, EDX=0x00000012
 29: EAX=0x00000000, EBX=0x00000000, ECX=0x0000001d, EDX=0x00000012
 30: EAX=0x00000000, EBX=0x00000000, ECX=0x0000001e, EDX=0x00000012
 31: EAX=0x00000000, EBX=0x00000000, ECX=0x0000001f, EDX=0x00000012
0x00000020: EAX=0x00000000, EBX=0x00000001, ECX=0x00000000, EDX=0x00000000
Extended Leafs :
================
0x80000000: EAX=0x80000008, EBX=0x00000000, ECX=0x00000000, EDX=0x00000000
0x80000001: EAX=0x00000000, EBX=0x00000000, ECX=0x00000121, EDX=0x2c100800
0x80000002: EAX=0x68743231, EBX=0x6e654720, ECX=0x746e4920, EDX=0x52286c65
0x80000003: EAX=0x6f432029, EBX=0x54286572, ECX=0x6920294d, EDX=0x32312d37
0x80000004: EAX=0x00553535, EBX=0x00000000, ECX=0x00000000, EDX=0x00000000
0x80000006: EAX=0x00000000, EBX=0x00000000, ECX=0x08008040, EDX=0x00000000
0x80000007: EAX=0x00000000, EBX=0x00000000, ECX=0x00000000, EDX=0x00000100
0x80000008: EAX=0x00003027, EBX=0x00000000, ECX=0x00000000, EDX=0x00000000


> - content of /sys/kernel/debug/x86/topo/cpus/* (on 6.9.y)

See attachment (cat_debug.log)

Cheers,
chris


[1]: https://gitlab.archlinux.org/archlinux/packaging/packages/linux/-/issues/57#note_189134

View attachment "dmesg6.8.9-arch1-2.log" of type "text/plain" (76496 bytes)

View attachment "cat_debug.log" of type "text/plain" (4771 bytes)

Download attachment "signature.asc" of type "application/pgp-signature" (834 bytes)