On Tue, Nov 6, 2018 at 5:47 PM Wei Liu <wei.l...@citrix.com> wrote:
> On Tue, Nov 06, 2018 at 03:31:31PM +0530, Rishi wrote:
> >
> > So after knowing the stack trace, it appears that the CPU was getting
> stuck
> > for xen_hypercall_xen_version
>
> That hypercall is used when a PV kernel (re-)enables interrupts. See
> xen_irq_enable. The purpose is to force the kernel to switch to
> hypervisor.
>
> >
> > watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [swapper/0:0]
> >
> >
> > [30569.582740] watchdog: BUG: soft lockup - CPU#0 stuck for 23s!
> > [swapper/0:0]
> >
> > [30569.588186] Kernel panic - not syncing: softlockup: hung tasks
> >
> > [30569.591307] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G L
> 4.19.1
> > #1
> >
> > [30569.595110] Hardware name: Xen HVM domU, BIOS 4.4.1-xs132257
> 12/12/2016
> >
> > [30569.598356] Call Trace:
> >
> > [30569.599597] <IRQ>
> >
> > [30569.600920] dump_stack+0x5a/0x73
> >
> > [30569.602998] panic+0xe8/0x249
> >
> > [30569.604806] watchdog_timer_fn+0x200/0x230
> >
> > [30569.607029] ? softlockup_fn+0x40/0x40
> >
> > [30569.609246] __hrtimer_run_queues+0x133/0x270
> >
> > [30569.611712] hrtimer_interrupt+0xfb/0x260
> >
> > [30569.613800] xen_timer_interrupt+0x1b/0x30
> >
> > [30569.616972] __handle_irq_event_percpu+0x69/0x1a0
> >
> > [30569.619831] handle_irq_event_percpu+0x30/0x70
> >
> > [30569.622382] handle_percpu_irq+0x34/0x50
> >
> > [30569.625048] generic_handle_irq+0x1e/0x30
> >
> > [30569.627216] __evtchn_fifo_handle_events+0x163/0x1a0
> >
> > [30569.629955] __xen_evtchn_do_upcall+0x41/0x70
> >
> > [30569.632612] xen_evtchn_do_upcall+0x27/0x50
> >
> > [30569.635136] xen_do_hypervisor_callback+0x29/0x40
> >
> > [30569.638181] RIP: e030:xen_hypercall_xen_version+0xa/0x20
>
> What is the asm code for this RIP?
>
>
> Wei.
>
The issue of crash is getting resolved with appending "noirqbalance" at xen
command line. This way all dom0 cpus are available but not irq balanced at
xen.
Even though I'm running irqbalance service in dom0 the irqs seems to be not
moving. <- this is dom0 perspective, I do not know yet, if it follows Xen
irq.
I tried objdump, while I have have the function in out but there is no asm
code of it. Its just "..."
ffffffff81001220 <xen_hypercall_xen_version>:
...
ffffffff81001240 <xen_hypercall_console_io>:
...
All "hypercalls" appear similarly.
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