Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
To:     Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>
Cc:     "x86@kernel.org" <x86@kernel.org>,
        LKML <linux-kernel@vger.kernel.org>, it+linux-x86@molgen.mpg.de
From:   Paul Menzel <pmenzel@molgen.mpg.de>
Subject: kernel BUG at arch/x86/kernel/apic/apic.c with Dell server with
 x2APIC enabled and unset X2APIC
Message-ID: <d573ba1c-0dc4-3016-712a-cc23a8a33d42@molgen.mpg.de>
Date:   Fri, 21 Feb 2020 15:37:23 +0100
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--------------ms020209010000070506010806
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Dear Linux folks,


On the Dell PowerEdge T640/04WYPY, BIOS 2.4.8 11/27/2019, Linux 5.4.14 (a=
nd 4.19.57) with
unset `IRQ_REMAP` and `X86_X2APIC` crashes on start-up, when x2APIC is en=
abled in the
firmware.

    [    3.862327] ACPI: Core revision 20190816
    [    3.869551] clocksource: hpet: mask: 0xffffffff max_cycles: 0xffff=
ffff, max_idle_ns: 79635855245 ns
    [    3.878797] APIC: Switch to symmetric I/O mode setup
    [    3.883893] Switched APIC routing to physical flat.
    [    3.888904] ------------[ cut here ]------------
    [    3.893641] kernel BUG at arch/x86/kernel/apic/apic.c:1616!
    [    3.899347] invalid opcode: 0000 [#1] SMP NOPTI
    [    3.903990] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.14.mx64.=
317 #1
    [    3.910803] Hardware name: Dell Inc. PowerEdge T640/04WYPY, BIOS 2=
=2E4.8 11/27/2019
    [    3.918448] RIP: 0010:setup_local_APIC+0x32e/0x390
    [    3.923356] Code: 68 70 2e 01 be 00 07 01 00 bf 50 03 00 00 48 8b =
40 10 e8 15 9e db 00 eb a9 be 00 04 01 00 bf 60 03 00 00 e8 04 9e db 00 e=
b bb <0f> 0b e8 5b 3a 00 00
    [    3.942300] RSP: 0000:ffffffff82403e88 EFLAGS: 00010246
    [    3.947641] RAX: 0000000000000000 RBX: 00000000000000ff RCX: fffff=
fff82454128
    [    3.955787] RDX: 0000000000000000 RSI: 00000000fffffeff RDI: 00000=
00000000020
    [    3.963031] RBP: ffffffffffffffff R08: 00000000000001c4 R09: 07340=
73407370739
    [    3.970277] R10: ffffffff82573000 R11: 0720072007730765 R12: fffff=
fff82a4a920
    [    3.977522] R13: 0000000000000000 R14: ffff88c07fff0e80 R15: 00000=
00000000000
    [    3.984766] FS:  0000000000000000(0000) GS:ffff889fffc00000(0000) =
knlGS:0000000000000000
    [    3.993014] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    [    3.998876] CR2: ffff88c07ffff000 CR3: 000000000240a001 CR4: 00000=
000000606b0
    [    4.006121] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 00000=
00000000000
    [    4.013365] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 00000=
00000000400
    [    4.020611] Call Trace:
    [    4.023184]  apic_intr_mode_init+0x1d2/0x1ec
    [    4.027573]  x86_late_time_init+0x17/0x1c
    [    4.031706]  start_kernel+0x41f/0x4d3
    [    4.035491]  secondary_startup_64+0xa4/0xb0
    [    4.039797] Modules linked in:
    [    4.042997] ---[ end trace c3629ce2e87a638c ]---
    [    4.047746] RIP: 0010:setup_local_APIC+0x32e/0x390
    [    4.052663] Code: 68 70 2e 01 be 00 07 01 00 bf 50 03 00 00 48 8b =
40 10 e8 15 9e db 00 eb a9 be 00 04 01 00 bf 60 03 00 00 e8 04 9e db 00 e=
b bb <0f> 0b e8 5b 3a 00 00
    [    4.071617] RSP: 0000:ffffffff82403e88 EFLAGS: 00010246
    [    4.076966] RAX: 0000000000000000 RBX: 00000000000000ff RCX: fffff=
fff82454128
    [    4.084219] RDX: 0000000000000000 RSI: 00000000fffffeff RDI: 00000=
00000000020
    [    4.091475] RBP: ffffffffffffffff R08: 00000000000001c4 R09: 07340=
73407370739
    [    4.098738] R10: ffffffff82573000 R11: 0720072007730765 R12: fffff=
fff82a4a920
    [    4.106000] R13: 0000000000000000 R14: ffff88c07fff0e80 R15: 00000=
00000000000
    [    4.113252] FS:  0000000000000000(0000) GS:ffff889fffc00000(0000) =
knlGS:0000000000000000
    [    4.121509] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    [    4.127380] CR2: ffff88c07ffff000 CR3: 000000000240a001 CR4: 00000=
000000606b0
    [    4.134632] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 00000=
00000000000
    [    4.141887] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 00000=
00000000400
    [    4.149142] Kernel panic - not syncing: Attempted to kill the idle=
 task!
    [    4.155968] ---[ end Kernel panic - not syncing: Attempted to kill=
 the idle task! ]---

This is the code below.

        /*
         * Double-check whether this APIC is really registered.
         * This is meaningless in clustered apic mode, so we skip it.
         */
        BUG_ON(!apic->apic_id_registered());

Should this be made a similar error as in `validate_x2apic`?

	panic("BIOS has enabled x2apic but kernel doesn't support x2apic, please=
 disable x2apic in BIOS.\n");

`noapic` and `acpi=3Doff` separately did not work, but `noapic acpi=3Doff=
` hit the other
panic.


Kind regards,

Paul


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