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#26 2025-03-03 17:17:28

gromit
Package Maintainer (PM)
From: Germany
Registered: 2024-02-10
Posts: 1,078
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Re: Applications in Windows 11 libvirt crashes under Kernel 6.13

Please try:

sudo pacman -U https://pkgbuild.com/\~gromit/linux-bisection-kernels/linux-mainline-v6.12.r1507.g3f02039-1-x86_64.pkg.tar.zst

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#27 2025-03-03 17:26:59

Raisins4u
Member
Registered: 2017-06-18
Posts: 26

Re: Applications in Windows 11 libvirt crashes under Kernel 6.13

gromit wrote:

Please try:

sudo pacman -U https://pkgbuild.com/\~gromit/linux-bisection-kernels/linux-mainline-v6.12.r1507.g3f02039-1-x86_64.pkg.tar.zst

This one's good

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#28 2025-03-03 17:48:57

loqs
Member
Registered: 2014-03-06
Posts: 18,402

Re: Applications in Windows 11 libvirt crashes under Kernel 6.13

Does adding the kernel parameter split_lock_detect=off have any effect on a kernel with the issue?

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#29 2025-03-03 18:10:55

gromit
Package Maintainer (PM)
From: Germany
Registered: 2024-02-10
Posts: 1,078
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Re: Applications in Windows 11 libvirt crashes under Kernel 6.13

Please try:

sudo pacman -U https://pkgbuild.com/\~gromit/linux-bisection-kernels/linux-mainline-v6.12.rc1.r18.g14077b9-1-x86_64.pkg.tar.zst

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#30 2025-03-03 18:52:37

Raisins4u
Member
Registered: 2017-06-18
Posts: 26

Re: Applications in Windows 11 libvirt crashes under Kernel 6.13

loqs wrote:

Does adding the kernel parameter split_lock_detect=off have any effect on a kernel with the issue?

YES, this was it. Did its default value change within 6.12?

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#31 2025-03-03 19:00:47

Raisins4u
Member
Registered: 2017-06-18
Posts: 26

Re: Applications in Windows 11 libvirt crashes under Kernel 6.13

gromit wrote:

Please try:

sudo pacman -U https://pkgbuild.com/\~gromit/linux-bisection-kernels/linux-mainline-v6.12.rc1.r18.g14077b9-1-x86_64.pkg.tar.zst

This one works too

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#32 2025-03-03 19:22:34

loqs
Member
Registered: 2014-03-06
Posts: 18,402

Re: Applications in Windows 11 libvirt crashes under Kernel 6.13

Raisins4u wrote:

YES, this was it. Did its default value change within 6.12?

https://lore.kernel.org/all/20240808062937.1149-3-ravi.bangoria@amd.com/ was added as part of 6.13 and has not been ruled out by the bisection so far.

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#33 2025-03-03 20:03:43

gromit
Package Maintainer (PM)
From: Germany
Registered: 2024-02-10
Posts: 1,078
Website

Re: Applications in Windows 11 libvirt crashes under Kernel 6.13

Please try:

sudo pacman -U https://pkgbuild.com/\~gromit/linux-bisection-kernels/linux-mainline-v6.12.r1518.ga5c93bf-1-x86_64.pkg.tar.zst

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#34 2025-03-03 20:11:05

Raisins4u
Member
Registered: 2017-06-18
Posts: 26

Re: Applications in Windows 11 libvirt crashes under Kernel 6.13

gromit wrote:

Please try:

sudo pacman -U https://pkgbuild.com/\~gromit/linux-bisection-kernels/linux-mainline-v6.12.r1518.ga5c93bf-1-x86_64.pkg.tar.zst

This one's broken

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#35 2025-03-03 20:35:31

gromit
Package Maintainer (PM)
From: Germany
Registered: 2024-02-10
Posts: 1,078
Website

Re: Applications in Windows 11 libvirt crashes under Kernel 6.13

Please try:

sudo pacman -U https://pkgbuild.com/\~gromit/linux-bisection-kernels/linux-mainline-v6.12.r1514.g89c45f3-1-x86_64.pkg.tar.zst

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#36 2025-03-03 20:54:38

Raisins4u
Member
Registered: 2017-06-18
Posts: 26

Re: Applications in Windows 11 libvirt crashes under Kernel 6.13

gromit wrote:

Please try:

sudo pacman -U https://pkgbuild.com/\~gromit/linux-bisection-kernels/linux-mainline-v6.12.r1514.g89c45f3-1-x86_64.pkg.tar.zst

Broken too

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#37 2025-03-03 21:07:19

gromit
Package Maintainer (PM)
From: Germany
Registered: 2024-02-10
Posts: 1,078
Website

Re: Applications in Windows 11 libvirt crashes under Kernel 6.13

Please try:

sudo pacman -U https://pkgbuild.com/\~gromit/linux-bisection-kernels/linux-mainline-v6.12.rc4.r3.g97ecb26-1-x86_64.pkg.tar.zst

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#38 2025-03-03 21:32:06

Raisins4u
Member
Registered: 2017-06-18
Posts: 26

Re: Applications in Windows 11 libvirt crashes under Kernel 6.13

gromit wrote:

Please try:

sudo pacman -U https://pkgbuild.com/\~gromit/linux-bisection-kernels/linux-mainline-v6.12.rc4.r3.g97ecb26-1-x86_64.pkg.tar.zst

This one works

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#39 2025-03-03 21:43:51

gromit
Package Maintainer (PM)
From: Germany
Registered: 2024-02-10
Posts: 1,078
Website

Re: Applications in Windows 11 libvirt crashes under Kernel 6.13

Please try:

sudo pacman -U https://pkgbuild.com/\~gromit/linux-bisection-kernels/linux-mainline-v6.11.rc2.r2.g408eb74-1-x86_64.pkg.tar.zst

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#40 2025-03-03 22:04:28

topcat01
Member
Registered: 2019-09-17
Posts: 158

Re: Applications in Windows 11 libvirt crashes under Kernel 6.13

Raisins4u wrote:
loqs wrote:

Does adding the kernel parameter split_lock_detect=off have any effect on a kernel with the issue?

YES, this was it. Did its default value change within 6.12?

I think we can also change it without rebooting by using:

sysctl kernel.split_lock_mitigate=0

This will still print some messages in the journal, but won't slow down the application.

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#41 2025-03-03 22:18:33

Raisins4u
Member
Registered: 2017-06-18
Posts: 26

Re: Applications in Windows 11 libvirt crashes under Kernel 6.13

gromit wrote:

Please try:

sudo pacman -U https://pkgbuild.com/\~gromit/linux-bisection-kernels/linux-mainline-v6.11.rc2.r2.g408eb74-1-x86_64.pkg.tar.zst

This one's broken

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#42 2025-03-03 22:32:37

gromit
Package Maintainer (PM)
From: Germany
Registered: 2024-02-10
Posts: 1,078
Website

Re: Applications in Windows 11 libvirt crashes under Kernel 6.13

Please try:

sudo pacman -U https://pkgbuild.com/\~gromit/linux-bisection-kernels/linux-mainline-v6.11.rc2.r1.g350afa8-1-x86_64.pkg.tar.zst

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#43 2025-03-03 23:24:29

Raisins4u
Member
Registered: 2017-06-18
Posts: 26

Re: Applications in Windows 11 libvirt crashes under Kernel 6.13

gromit wrote:

Please try:

sudo pacman -U https://pkgbuild.com/\~gromit/linux-bisection-kernels/linux-mainline-v6.11.rc2.r1.g350afa8-1-x86_64.pkg.tar.zst

This one works.

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#44 2025-03-04 09:08:59

gromit
Package Maintainer (PM)
From: Germany
Registered: 2024-02-10
Posts: 1,078
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Re: Applications in Windows 11 libvirt crashes under Kernel 6.13

This is the first bad commit:

commit 408eb7417a92c5354c7be34f7425b305dfe30ad9
Author: Ravi Bangoria <ravi.bangoria@amd.com>
Date:   Thu Aug 8 06:29:35 2024 +0000

    x86/bus_lock: Add support for AMD
    
    Add Bus Lock Detect (called Bus Lock Trap in AMD docs) support for AMD
    platforms. Bus Lock Detect is enumerated with CPUID Fn0000_0007_ECX_x0
    bit [24 / BUSLOCKTRAP]. It can be enabled through MSR_IA32_DEBUGCTLMSR.
    When enabled, hardware clears DR6[11] and raises a #DB exception on
    occurrence of Bus Lock if CPL > 0. More detail about the feature can be
    found in AMD APM[1].
    
    [1]: AMD64 Architecture Programmer's Manual Pub. 40332, Rev. 4.07 - June
         2023, Vol 2, 13.1.3.6 Bus Lock Trap
         https://bugzilla.kernel.org/attachment.cgi?id=304653
    
    Signed-off-by: Ravi Bangoria <ravi.bangoria@amd.com>
    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
    Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
    Link: https://lore.kernel.org/all/20240808062937.1149-3-ravi.bangoria@amd.com

 Documentation/arch/x86/buslock.rst | 3 ++-
 arch/x86/Kconfig                   | 2 +-
 arch/x86/kernel/cpu/common.c       | 2 ++
 arch/x86/kernel/cpu/intel.c        | 1 -
 4 files changed, 5 insertions(+), 3 deletions(-)

How do we go about the bug reporting to the upstream kernel devs? Do you want to file a bug or should I do it?

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#45 2025-03-04 16:54:10

Raisins4u
Member
Registered: 2017-06-18
Posts: 26

Re: Applications in Windows 11 libvirt crashes under Kernel 6.13

gromit wrote:

This is the first bad commit:

commit 408eb7417a92c5354c7be34f7425b305dfe30ad9
Author: Ravi Bangoria <ravi.bangoria@amd.com>
Date:   Thu Aug 8 06:29:35 2024 +0000

    x86/bus_lock: Add support for AMD
    
    Add Bus Lock Detect (called Bus Lock Trap in AMD docs) support for AMD
    platforms. Bus Lock Detect is enumerated with CPUID Fn0000_0007_ECX_x0
    bit [24 / BUSLOCKTRAP]. It can be enabled through MSR_IA32_DEBUGCTLMSR.
    When enabled, hardware clears DR6[11] and raises a #DB exception on
    occurrence of Bus Lock if CPL > 0. More detail about the feature can be
    found in AMD APM[1].
    
    [1]: AMD64 Architecture Programmer's Manual Pub. 40332, Rev. 4.07 - June
         2023, Vol 2, 13.1.3.6 Bus Lock Trap
         https://bugzilla.kernel.org/attachment.cgi?id=304653
    
    Signed-off-by: Ravi Bangoria <ravi.bangoria@amd.com>
    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
    Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
    Link: https://lore.kernel.org/all/20240808062937.1149-3-ravi.bangoria@amd.com

 Documentation/arch/x86/buslock.rst | 3 ++-
 arch/x86/Kconfig                   | 2 +-
 arch/x86/kernel/cpu/common.c       | 2 ++
 arch/x86/kernel/cpu/intel.c        | 1 -
 4 files changed, 5 insertions(+), 3 deletions(-)

How do we go about the bug reporting to the upstream kernel devs? Do you want to file a bug or should I do it?

Thank you so much for your help Gromit! I want to try doing the reporting myself. Do I just send the bug report w/ affected diff to the author + those that signed off and reviewed it? Or should I include linux-kernel@vger.kernel.org & kvm@vger.kernel.org mailing lists as well as all others involved as part of this commit?

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#46 2025-03-04 17:03:41

gromit
Package Maintainer (PM)
From: Germany
Registered: 2024-02-10
Posts: 1,078
Website

Re: Applications in Windows 11 libvirt crashes under Kernel 6.13

You're welcome! Nice, please have a look at the "Reporting regressions" document: https://docs.kernel.org/admin-guide/rep … sions.html
Also you may want to have a look at one of my recent reports: https://lore.kernel.org/all/3cd82004-c5 … heusel.eu/

I usually try to put the patch authors in "To:" and CC the relevant maintainer list, any involved people and the regressions list.

$ ./scripts/get_maintainer.pl --no-rolestats -f  arch/x86/kernel/cpu/common.c
Thomas Gleixner <tglx@linutronix.de>
Ingo Molnar <mingo@redhat.com>
Borislav Petkov <bp@alien8.de>
Dave Hansen <dave.hansen@linux.intel.com>
x86@kernel.org
"H. Peter Anvin" <hpa@zytor.com>
"Xin Li (Intel)" <xin@zytor.com>
Tony Luck <tony.luck@intel.com>
Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Juergen Gross <jgross@suse.com>
linux-kernel@vger.kernel.org

In this case this is quite some people ... Also it would be nice if you could credit me in your report for the efforts that I have put into building all these kernels, you can cc me with "christian@heusel.eu" big_smile

Last edited by gromit (2025-03-04 17:04:15)

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#47 2025-03-06 15:17:54

loqs
Member
Registered: 2014-03-06
Posts: 18,402

Re: Applications in Windows 11 libvirt crashes under Kernel 6.13

Upstream response to the report https://lore.kernel.org/regressions/Z8j … oogle.com/ @gromit could you build a test kernel with the series from https://lore.kernel.org/all/20250227222 … oogle.com/ applied?

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#48 2025-03-06 15:46:46

gromit
Package Maintainer (PM)
From: Germany
Registered: 2024-02-10
Posts: 1,078
Website

Re: Applications in Windows 11 libvirt crashes under Kernel 6.13

Please test the the following kernel build which has the series mentioned by @loqs applied:

https://pkgbuild.com/~gromit/linux-bisection-kernels/linux-mainline-6.14rc5-3-x86_64.pkg.tar.zst

Last edited by gromit (2025-03-06 15:50:06)

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