Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1200309

Re: [Xen-devel] printk from softirq on xen: hard lockup

Show all headers | View raw

Hey David,

Sorry for the premature response on my phone earlier. Real reply follows.
>> rcu_read_lock, when using Xen PV. Relevant excerpts of the
>                                 ^^  PV guest?

Yes. The lockup occurs on a PV guest. Nothing special at all about the
configuration. Vanilla upstream 4.1.3 kernel.

>> __xapic_wait_icr_idle () at ./arch/x86/include/asm/ipi.h:56
>> 56              while (native_apic_mem_read(APIC_ICR) & APIC_ICR_BUSY)
>                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  => HVM guest
>
> Which is it?

That's odd. It's a PV guest, not an HVM nor PVH guest.

>
> A HVM guest's serial console may be particularly slow (since it's
> emulated by qemu).  Try using the PV console?

I am using the PV console. But actually the problem occurs too even if
/proc/sys/kernel/printk is set to all zeros (no klog on the console).

The plot thickens?
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

printk from softirq on xen: hard lockup "Jason A. Donenfeld" <Jason@zx2c4.com> - 2015-08-04 18:50 +0200
  Re: [Xen-devel] printk from softirq on xen: hard lockup David Vrabel <david.vrabel@citrix.com> - 2015-08-04 19:20 +0200
    Re: [Xen-devel] printk from softirq on xen: hard lockup "Jason A. Donenfeld" <Jason@zx2c4.com> - 2015-08-05 01:10 +0200
      Re: [Xen-devel] printk from softirq on xen: hard lockup David Vrabel <david.vrabel@citrix.com> - 2015-08-06 12:10 +0200
        Re: [Xen-devel] printk from softirq on xen: hard lockup "Jason A. Donenfeld" <Jason@zx2c4.com> - 2015-08-06 18:00 +0200
          Re: [Xen-devel] printk from softirq on xen: hard lockup David Vrabel <david.vrabel@citrix.com> - 2015-08-06 18:20 +0200
            Re: [Xen-devel] printk from softirq on xen: hard lockup "Jason A. Donenfeld" <Jason@zx2c4.com> - 2015-08-06 18:30 +0200
              [PATCH] xen-apic: Enable on domU as well "Jason A. Donenfeld" <Jason@zx2c4.com> - 2015-08-06 18:30 +0200
                [PATCH v2] xen-apic: Enable on domU as well "Jason A. Donenfeld" <Jason@zx2c4.com> - 2015-08-06 18:40 +0200
                Re: [Xen-devel] [PATCH v2] xen-apic: Enable on domU as well Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> - 2015-08-07 16:30 +0200
                Re: [Xen-devel] [PATCH v2] xen-apic: Enable on domU as well "Jason A. Donenfeld" <Jason@zx2c4.com> - 2015-08-07 16:40 +0200
                [PATCH v3] xen-apic: Enable on domU as well "Jason A. Donenfeld" <Jason@zx2c4.com> - 2015-08-10 15:50 +0200
                Re: [PATCH v3] xen-apic: Enable on domU as well "Jason A. Donenfeld" <Jason@zx2c4.com> - 2015-08-10 15:50 +0200
                Re: [PATCH v3] xen-apic: Enable on domU as well David Vrabel <david.vrabel@citrix.com> - 2015-08-10 15:50 +0200
                Re: [Xen-devel] [PATCH v3] xen-apic: Enable on domU as well David Vrabel <david.vrabel@citrix.com> - 2015-08-11 12:50 +0200
    Re: [Xen-devel] printk from softirq on xen: hard lockup "Jason A. Donenfeld" <Jason@zx2c4.com> - 2015-08-05 18:40 +0200
    Re: [Xen-devel] printk from softirq on xen: hard lockup Ian Campbell <ian.campbell@citrix.com> - 2015-08-06 10:30 +0200

csiph-web