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Groups > linux.kernel > #1200171
| From | David Vrabel <david.vrabel@citrix.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [Xen-devel] printk from softirq on xen: hard lockup |
| Date | 2015-08-04 19:20 +0200 |
| Message-ID | <pTO2D-9e-15@gated-at.bofh.it> (permalink) |
| References | <pTNzB-7Ny-19@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On 04/08/15 17:41, Jason A. Donenfeld wrote:
> Hi folks,
>
> Paul McKenney and I had an offline discussion about some rcu questions
> that eventually lead into me investigating a strange full lock-up I'm
> experiencing as a consequence of a printk in softirq inside of an
> rcu_read_lock, when using Xen PV. Relevant excerpts of the
^^ PV guest?
> (gdb) target remote localhost:9999
> Remote debugging using localhost:9999
> __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?
A HVM guest's serial console may be particularly slow (since it's
emulated by qemu). Try using the PV console?
David
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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
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