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charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.54.3 (3.54.3-1.fc41) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Sender: riel@surriel.com On Sat, 2025-02-22 at 12:29 +0100, Oleksandr Natalenko wrote: >=20 > [=C2=A0=C2=A0 24.381400] RIP: 0010:get_cpu_cap+0x39b/0x4f0 >=20 > $ scripts/faddr2line arch/x86/kernel/cpu/common.o get_cpu_cap+0x39b > get_cpu_cap+0x39b/0x500: > get_cpu_cap at =E2=80=A6/arch/x86/kernel/cpu/common.c:1063 >=20 > 1060=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (c->extended_cpui= d_level >=3D 0x80000008) { > 1061=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0 cpuid(0x80000008, &eax, &ebx, &ecx, &edx); > 1062=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0 c->x86_capability[CPUID_8000_0008_EBX] =3D ebx; > 1063=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0 invlpgb_count_max =3D (edx & 0xffff) + 1; > 1064=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 } > ``` >=20 > Any idea what I'm looking at? It's crashing when writing the value to the invlpgb_count_max variable. This would be because: 1) invlpgb_count_max is marked __ro_after_init, making it read-only after the system has finished booting, but 2) get_cpu_cap gets run at resume and CPU hotplug time! Borislav, do you prefer I move the initialization of=C2=A0 invlpgb_count_max back to where it was before, or get rid of the __ro_after_init thing? --=20 All Rights Reversed.