AW: [Xen-devel] 2.6.32.22 (amd64) domU Kernel doesnt boot - kernel panic

[Giovanni Bellac <giovannib1979@xxxxxxxxx>]

Hello

no, got a kernel panic too:

[7257008.739405] SLUB: Genslabs=14, HWalign=64, Order=0-3, MinObjects=0, CPUs=4,                                                             Nodes=1
[7257008.739427] Hierarchical RCU implementation.
[7257008.739432] NR_IRQS:2304
[7257008.739821] Console: colour dummy device 80x25
[7257008.739918] console [tty0] enabled
[7257008.740107] console [hvc0] enabled
[7257008.740137] installing Xen timer for CPU 0
[7257008.740160] BUG: unable to handle kernel NULL pointer dereference at (null)
[7257008.740169] IP: [<(null)>] (null)
[7257008.740175] PGD 0
[7257008.740179] Thread overran stack, or stack corrupted
[7257008.740184] Oops: 0010 [#1] SMP
[7257008.740190] last sysfs file:
[7257008.740194] CPU 0
[7257008.740198] Modules linked in:
[7257008.740205] Pid: 0, comm: swapper Not tainted 2.6.32.22 #1
[7257008.740210] RIP: e030:[<0000000000000000>]  [<(null)>] (null)
[7257008.740217] RSP: e02b:ffffffff81807da0  EFLAGS: 00010082
[7257008.740222] RAX: ffffffff81b64a50 RBX: 0000000000000000 RCX: 00000000000002                                                            00
[7257008.740229] RDX: 0000000000000000 RSI: ffffffff81b454a8 RDI: 00000000000000                                                            00
[7257008.740235] RBP: ffffffff81807db8 R08: ffff88007fc18080 R09: ffffffff818957                                                            30
[7257008.740241] R10: ffffffff81895750 R11: 0000000000000001 R12: ffffffff818292                                                            40
[7257008.740248] R13: ffff88007fc1b000 R14: 0000000000000000 R15: ffffffff818292                                                            a4
[7257008.740259] FS:  0000000000000000(0000) GS:ffff880001fd8000(0000) knlGS:000                                                            0000000000000
[7257008.740266] CS:  e033 DS: 0000 ES: 0000 CR0: 000000008005003b
[7257008.740272] CR2: 0000000000000000 CR3: 0000000001001000 CR4: 00000000000026                                                            60
[7257008.740279] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 00000000000000                                                            00
[7257008.740286] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 00000000000004                                                            00
[7257008.740292] Process swapper (pid: 0, threadinfo ffffffff81806000, task ffff                                                            ffff818999f0)
[7257008.740299] Stack:
[7257008.740302]  ffffffff8107cac5 0000000000000000 00000000ffffffda ffffffff818                                                            07dd8
[7257008.740312] <0> ffffffff8107caa5 ffffffff815a94b1 ffffffff81829240 ffffffff                                                            81807e18
[7257008.740323] <0> ffffffff8107c009 0000000000000200 ffff88007fc1b000 00000000                                                            fffffff4
[7257008.740336] Call Trace:
[7257008.740346]  [<ffffffff8107cac5>] ? default_enable+0x1a/0x28
[7257008.740354]  [<ffffffff8107caa5>] default_startup+0x19/0x1f
[7257008.740363]  [<ffffffff815a94b1>] ? _spin_lock_irqsave+0x19/0x32
[7257008.740371]  [<ffffffff8107c009>] __setup_irq+0x197/0x2cf
[7257008.740379]  [<ffffffff8100e05f>] ? xen_timer_interrupt+0x0/0x182
[7257008.740386]  [<ffffffff8107c22d>] request_threaded_irq+0xec/0x12b
[7257008.740396]  [<ffffffff812b278c>] bind_virq_to_irqhandler+0x13f/0x163
[7257008.740404]  [<ffffffff8100e05f>] ? xen_timer_interrupt+0x0/0x182
[7257008.740411]  [<ffffffff8100e01a>] xen_setup_timer+0x59/0x9e
[7257008.740420]  [<ffffffff8198f5a3>] xen_time_init+0xb7/0xc0
[7257008.740427]  [<ffffffff8198fa27>] x86_late_time_init+0xa/0x11
[7257008.740434]  [<ffffffff8198bc2f>] start_kernel+0x2fe/0x385
[7257008.740441]  [<ffffffff8198b2bf>] x86_64_start_reservations+0xaa/0xae
[7257008.740448]  [<ffffffff8198ead2>] xen_start_kernel+0x541/0x548
[7257008.740453] Code:  Bad RIP value.
[7257008.740463] RIP  [<(null)>] (null)
[7257008.740468]  RSP <ffffffff81807da0>
[7257008.740472] CR2: 0000000000000000
[7257008.740482] ---[ end trace 4eaa2a86a8e2da22 ]---
[7257008.740487] Kernel panic - not syncing: Attempted to kill the idle task!
[7257008.740494] Pid: 0, comm: swapper Tainted: G      D    2.6.32.22 #1
[7257008.740499] Call Trace:
[7257008.740504]  [<ffffffff815a7537>] panic+0xa0/0x158
[7257008.740510]  [<ffffffff815a7656>] ? printk+0x67/0x69
[7257008.740519]  [<ffffffff81055e60>] ? blocking_notifier_call_chain+0xf/0x11
[7257008.740528]  [<ffffffff81042b76>] do_exit+0x79/0x6c9
[7257008.740534]  [<ffffffff815aa492>] oops_end+0xb9/0xc1
[7257008.740541]  [<ffffffff8102aeed>] no_context+0x1ea/0x1f9
[7257008.740547]  [<ffffffff8102b0b5>] __bad_area_nosemaphore+0x1b9/0x1df
[7257008.740556]  [<ffffffff8108ec17>] ? __alloc_pages_nodemask+0x11a/0x5e7
[7257008.740563]  [<ffffffff8100dd01>] ? xen_force_evtchn_callback+0xd/0xf
[7257008.740570]  [<ffffffff8100e352>] ? check_events+0x12/0x20
[7257008.740576]  [<ffffffff8102b0e9>] bad_area_nosemaphore+0xe/0x10
[7257008.740584]  [<ffffffff815ab98a>] do_page_fault+0x1a0/0x2d6
[7257008.740590]  [<ffffffff815a9975>] page_fault+0x25/0x30
[7257008.740597]  [<ffffffff8107cac5>] ? default_enable+0x1a/0x28
[7257008.740604]  [<ffffffff8107caa5>] default_startup+0x19/0x1f
[7257008.740611]  [<ffffffff815a94b1>] ? _spin_lock_irqsave+0x19/0x32
[7257008.740617]  [<ffffffff8107c009>] __setup_irq+0x197/0x2cf
[7257008.740624]  [<ffffffff8100e05f>] ? xen_timer_interrupt+0x0/0x182
[7257008.740631]  [<ffffffff8107c22d>] request_threaded_irq+0xec/0x12b
[7257008.740638]  [<ffffffff812b278c>] bind_virq_to_irqhandler+0x13f/0x163
[7257008.940292]  [<ffffffff8100e05f>] ? xen_timer_interrupt+0x0/0x182
[7257008.940305]  [<ffffffff8100e01a>] xen_setup_timer+0x59/0x9e
[7257008.940317]  [<ffffffff8198f5a3>] xen_time_init+0xb7/0xc0
[7257008.940327]  [<ffffffff8198fa27>] x86_late_time_init+0xa/0x11
[7257008.940336]  [<ffffffff8198bc2f>] start_kernel+0x2fe/0x385
[7257008.940345]  [<ffffffff8198b2bf>] x86_64_start_reservations+0xaa/0xae
[7257008.940355]  [<ffffffff8198ead2>] xen_start_kernel+0x541/0x548

Best regards
Gio

---

Von: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
An: Giovanni Bellac <giovannib1979@xxxxxxxxx>
CC: xen-devel@xxxxxxxxxxxxxxxxxxx
Gesendet: Donnerstag, den 23. September 2010, 0:48:57 Uhr
Betreff: Re: [Xen-devel] 2.6.32.22 (amd64) domU Kernel doesnt boot - kernel panic

On 09/21/2010 03:02 AM, Giovanni Bellac wrote:
> Hello
>
> I have used my 2.6.32.20 config and compiled now a 2.6.32.22 from
> kernel.org.
> 2.6.32.22 has the important security fix (local user can be root with
> a exploit).

Does this help?

Thanks,
    J

From: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
Date: Wed, 22 Sep 2010 15:28:52 -0700
Subject: [PATCH] xen: set up IRQ before binding virq to evtchn

Make sure the irq is set up before binding a virq event channel to it.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>

diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 3132a5e..cd17f86 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -426,6 +426,11 @@ static int bind_virq_to_irq(unsigned int virq, unsigned int cpu)
    irq = per_cpu(virq_to_irq, cpu)[virq];

    if (irq == -1) {
+        irq = find_unbound_irq();
+
+        set_irq_chip_and_handler_name(irq, &xen_percpu_chip,
+                          handle_percpu_irq, "virq");
+
        bind_virq.virq = virq;
        bind_virq.vcpu = cpu;
        if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_virq,
@@ -433,11 +438,6 @@ static int bind_virq_to_irq(unsigned int virq, unsigned int cpu)
            BUG();
        evtchn = bind_virq.port;

-        irq = find_unbound_irq();
-
-        set_irq_chip_and_handler_name(irq, &xen_percpu_chip,
-                          handle_percpu_irq, "virq");
-
        evtchn_to_irq[evtchn] = irq;
        irq_info[irq] = mk_virq_info(evtchn, virq);

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