Re: [Xen-devel] swap: don't do discard if no discard option added

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Mon, May 21, 2012 at 12:30:45AM +0200, William Dauchy wrote:
> Hello,
> 
> On Xen, when booting a guest with a system disk and an additional swap
> disk I'm getting a calltrace.
> xen hypervisor: 4.1.2; linux dom0: v3.3.6; linux guest: v3.2.17
> When booting without a swap disk, I don't have the issue.
> I also tested a guest with v3.3.6: same problem. But from v3.4-rc2,
> the issue is fixed.
> I cherry-picked:

> 052b198 swap: don't do discard if no discard option added

So you are asking for 052b198 to be back-ported.

I am OK with that but I think Shaohua needs to Ack that and
ask Greg to put it on stable@xxxxxxxxxx



> Applied and tested on top of v3.2.17 and v3.3.6, it fixes the issue.
> 
> Pid: 0, comm: swapper/0 Not tainted 3.2.17-x86_64 #12
> Call Trace:
>  <IRQ>
>  [<ffffffff810919da>] ? handle_irq_event_percpu+0x3a/0x140
>  [<ffffffff81091b29>] ? handle_irq_event+0x49/0x80
>  [<ffffffff81094e7d>] ? handle_edge_irq+0x6d/0x120
>  [<ffffffff81229088>] ? __xen_evtchn_do_upcall+0x1b8/0x280
>  [<ffffffff8122a442>] ? xen_evtchn_do_upcall+0x22/0x40
>  [<ffffffff8133f4fe>] ? xen_do_hypervisor_callback+0x1e/0x30
>  <EOI>
>  [<ffffffff810013aa>] ? hypercall_page+0x3aa/0x1000
>  [<ffffffff810013aa>] ? hypercall_page+0x3aa/0x1000
>  [<ffffffff8100768c>] ? xen_safe_halt+0xc/0x20
>  [<ffffffff81013563>] ? default_idle+0x23/0x40
>  [<ffffffff8100b073>] ? cpu_idle+0x63/0xb0
>  [<ffffffff81654c43>] ? start_kernel+0x362/0x36d
>  [<ffffffff81657491>] ? xen_start_kernel+0x558/0x55e
> Code: 39 ed 0f 84 1c 02 00 00 44 8b 7b 48 4c 8b 73 50 41 83 ef 01 41
> 21 ef 49 6b c7 70 4d 8b 64 06 40 49 69 c4 d0 00 00 00 48 8d 14 03 <48>
> 8b 8a 78 02 00 00 48 89 4c 24 10 80 ba 09 02 00 00 00 74 6d
> RIP  [<ffffffff8125ed66>] blkif_interrupt+0x66/0x320
>  RSP <ffff88001fc03e18>
> ---[ end trace dfd4e5623eb06620 ]---
> 
> Regards,
> -- 
> William
> 
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