[Xen-users] Help: how do I debug this: kernel: BUG: warning at block/ll_rw_blk.c:1767/blk_start_queue() (Tainted: G)

["Joe Linoff" <jlinoff@xxxxxxxxxx>]

Hi:

O/S: CentOS 5.5
Xen: 3.4.3

We are getting this error from one of our VMs (/var/log/messages) and I
don't know where to start debugging. Any hints would be greatly
appreciated.

   kernel: BUG: warning at block/ll_rw_blk.c:1767/blk_start_queue()
(Tainted: G)

These VM's are using DRBD to implement high availability server data.
One is the master and the other is a slave. Only the master (writer)
exhibits the problem. When the other VM is converted to the master the
problem then moves over there.

I suspect that DRBD is part of the problem because the error message
went away when I turned it off but we have a similar setup running under
xenserver and it works without these errors.

We have tried starting/stopping drbd and nfs. We tried mkfs.ext3 on the
filesystems.

Thank you,

Joe

FULL LOG ENTRY:

Feb 23 18:30:43 sgs-01 kernel: BUG: warning at
block/ll_rw_blk.c:1767/blk_start_queue() (Tainted: G     )
Feb 23 18:30:43 sgs-01 kernel: 
Feb 23 18:30:43 sgs-01 kernel: Call Trace:
Feb 23 18:30:43 sgs-01 kernel:  <IRQ>  [<ffffffff80336e7e>]
blk_start_queue+0x3c/0x7a
Feb 23 18:30:43 sgs-01 kernel:  [<ffffffff88075964>]
:xenblk:kick_pending_request_queues+0x1b/0x2a
Feb 23 18:30:43 sgs-01 kernel:  [<ffffffff88075d66>]
:xenblk:blkif_int+0x168/0x18d
Feb 23 18:30:43 sgs-01 kernel:  [<ffffffff802115d1>]
handle_IRQ_event+0x55/0xae
Feb 23 18:30:43 sgs-01 kernel:  [<ffffffff802b3562>] __do_IRQ+0xa4/0x103
Feb 23 18:30:43 sgs-01 kernel:  [<ffffffff8029032a>]
_local_bh_enable+0x61/0xc5
Feb 23 18:30:43 sgs-01 kernel:  [<ffffffff8026df50>] do_IRQ+0xe7/0xf5
Feb 23 18:30:43 sgs-01 kernel:  [<ffffffff803b3e7b>]
evtchn_do_upcall+0x13b/0x1fb
Feb 23 18:30:43 sgs-01 kernel:  [<ffffffff802608d6>]
do_hypervisor_callback+0x1e/0x2c
Feb 23 18:30:43 sgs-01 kernel:  <EOI>  [<ffffffff802063aa>]
hypercall_page+0x3aa/0x1000
Feb 23 18:30:43 sgs-01 kernel:  [<ffffffff802063aa>]
hypercall_page+0x3aa/0x1000
Feb 23 18:30:43 sgs-01 kernel:  [<ffffffff8026f4f3>]
raw_safe_halt+0x84/0xa8
Feb 23 18:30:43 sgs-01 kernel:  [<ffffffff8026ca88>] xen_idle+0x38/0x4a
Feb 23 18:30:43 sgs-01 kernel:  [<ffffffff8024af6c>] cpu_idle+0x97/0xba
Feb 23 18:30:43 sgs-01 kernel:  [<ffffffff8064eb0f>]
start_kernel+0x21f/0x224
Feb 23 18:30:43 sgs-01 kernel:  [<ffffffff8064e1e5>]
_sinittext+0x1e5/0x1eb
Feb 23 18:30:43 sgs-01 kernel:


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