Control: tag -1 moreinfo On Thu, 17 Apr 2025 11:57:47 +0800 root <larry...@yeah.net> wrote: > Package: linux-image-amd64 > Version: 6.12.22-1 > Severity: important > > Dear Maintainer, > > After linux-image-6.11.9-amd64, my laptop has never booted from linux-image- > amd64 any more. It shows "Kernel panic" after Grub. I took a screenshot for > that. I do hope you maintainers can SAVE my laptop. > > The Kernel panic print as follow: > -------------------------------------------------------------------------------- > 0.93186510ops: general protection fault, naybe for address 0x0: 0000 [#1] > PREEMPT SMP NOPTI > 0.9318931 CPU: 1 UID:0 PID:1 Comn: init Not tainted 6.12.22-and64 #1 Debian > 6.12.22-1 > 0.9319151 Harduare nane: GITSIAR GDC-1461/GM-1461,BIOS 03.04 08/03/2023 > 0.9319321 RIP: 0010:copy_fpstate_to_sigframe+0x1eb/0x3c0 > 0.9319521 Code: b9 01 00 00 00 of 01 d0 48 c1 e2 20 89 c0 48 01 c2 48 81 ca ff > 02 00 00 49 21 d5 e9 f4 fe ff ff 0f 1f 44 00 00 b9 01 00 0 0 <0f> 01 d0 48 c1 > e2 20 89 c0 48 8d 8d 00 02 00 00 48 01 d0 4c 21 e8
We got a #GP exception on an XGETBV instruction, which means "ECX
specifies a reserved or unimplemented XCR address". So this instruction
is wrongly being used on a CPU that doesn't support it.
To help confirm this, please can you send the contents of /proc/cpuinfo?
> 0.9319911 RSP:0018:ffffa6844002bc28EFLAGS:00010246
> 0.9320061RAX: 0 RBX: 00000000 RcX: 00000001
[...]
ECX is 1 (= XCR_XFEATURE_IN_USE_MASK). So this is a use of
xfeatures_in_use() inlined into copy_fpstate_to_sigframe().
Since this is a regression after 6.11.9, my guess is that this is caused
by:
commit dd9478d54c738e86692b83cc992dc4fb643bcdbf
Author: Aruna Ramakrishna <aruna.ramakris...@oracle.com>
Date: Tue Nov 19 17:45:20 2024 +0000
x86/pkeys: Ensure updated PKRU value is XRSTOR'd
[ Upstream commit ae6012d72fa60c9ff92de5bac7a8021a47458e5b ]
which went into 6.12.5 and adds a call to xfeatures_in_use() without an
obvious CPU feature check. (The added call is not directly in
copy_fpstate_to_sigframe() but it's in a function that can be inlined
into it.)
Ben.
--
Ben Hutchings
compatible: Gracefully accepts erroneous data from any source
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