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Re: [Xen-devel] Re: [PATCH] blkfront: Move blkif_interrupt into a tasklet.

On 08/17/2011 04:38 AM, Konrad Rzeszutek Wilk wrote:
On Tue, Aug 16, 2011 at 04:26:55AM -0700, imammedo wrote:

Jeremy Fitzhardinge wrote:

Have you tried bisecting to see when this particular problem appeared?
It looks to me like something is accidentally re-enabling interrupts -
perhaps a stack overrun is corrupting the "flags" argument between a
spin_lock_irqsave()/restore pair.

Is it only on 32-bit kernels?

  ------------[ cut here ]------------
[604001.659925] WARNING: at block/blk-core.c:239 blk_start_queue+0x70/0x80()
[604001.659964] Modules linked in: nfs lockd fscache auth_rpcgss nfs_acl
sunrpc ip6t_REJECT nf_conntrack_ipv6 nf_conntrack_ipv4 nf_defrag_ipv4
nf_defrag_ipv6 xt_state nf_conntrack ip6table_filter ip6_tables xen_netfront
pcspkr [last unloaded: scsi_wait_scan]
[604001.660147] Pid: 336, comm: udevd Tainted: G        W   3.0.0+ #50
[604001.660181] Call Trace:
[604001.660209]  [<c045c512>] warn_slowpath_common+0x72/0xa0
[604001.660243]  [<c06643a0>] ? blk_start_queue+0x70/0x80
[604001.660275]  [<c06643a0>] ? blk_start_queue+0x70/0x80
[604001.660310]  [<c045c562>] warn_slowpath_null+0x22/0x30
[604001.660343]  [<c06643a0>] blk_start_queue+0x70/0x80
[604001.660379]  [<c075e231>] kick_pending_request_queues+0x21/0x30
[604001.660417]  [<c075e42f>] blkif_interrupt+0x19f/0x2b0
  ------------[ cut here ]------------

I've debugged a bit blk-core warning and can say:
   - Yes, It is 32-bit PAE kernel and happens only with it so far.
   - Affects PV xen guest, bare-metal and kvm configs are not affected.
   - Upstream kernel is affected as well.
   - Reproduces on xen 4.1.1 and 3.1.2 hosts

And the dom0 is 2.6.18 right? This problem is not present
when you use a 3.0 dom0?

For xen 4.1.1 testing, I've used as dom0 Jeremy's


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