[Xen-devel] xen-unstable pvops 2.6.32.21 kernel/lockdep.c:2323 trace_hardirqs_on_caller+0x12f/0x190()

[Bruce Edge <bruce.edge@xxxxxxxxx>]

With top of xen-unstable and pvops 2.6.32.x I get this on the dom0
serial console when I start a linux pvops domU (using the same kernel
as the dom0):

0 kaan-18  ~ #> (XEN) tmem: all pools frozen for all domains
(XEN) tmem: all pools thawed for all domains
(XEN) tmem: all pools frozen for all domains
(XEN) tmem: all pools thawed for all domains

mapping kernel into physical memory
about to get started...
[  188.652747] ------------[ cut here ]------------
[  188.652800] WARNING: at kernel/lockdep.c:2323
trace_hardirqs_on_caller+0x12f/0x190()
[  188.652826] Hardware name: ProLiant DL380 G6
[  188.652844] Modules linked in: xt_physdev osa_mfgdom0 xenfs
xen_gntdev xen_evtchn ipv6 fbcon tileblit font bitblit softcursor
xen_pciback radeon tun ttm drm_kms_helper serio_raw ipmi_si bridge drm
i2c_algo_bit stp ipmi_msghandler joydev hpilo hpwdt i2c_core llc lp
parport usbhid hid cciss usb_storage
[  188.653063] Pid: 11, comm: xenwatch Not tainted 2.6.32.21-1 #1
[  188.653084] Call Trace:
[  188.653094]  <IRQ>  [<ffffffff810aa22f>] ?
trace_hardirqs_on_caller+0x12f/0x190
[  188.653127]  [<ffffffff8106bf70>] warn_slowpath_common+0x80/0xd0
[  188.653153]  [<ffffffff815f3f50>] ? _spin_unlock_irq+0x30/0x40
[  188.653177]  [<ffffffff8106bfd4>] warn_slowpath_null+0x14/0x20
[  188.653200]  [<ffffffff810aa22f>] trace_hardirqs_on_caller+0x12f/0x190
[  188.653224]  [<ffffffff810aa29d>] trace_hardirqs_on+0xd/0x10
[  188.653246]  [<ffffffff815f3f50>] _spin_unlock_irq+0x30/0x40
[  188.653270]  [<ffffffff813c5055>] add_to_net_schedule_list_tail+0x85/0xd0
[  188.653294]  [<ffffffff813c62a6>] netif_be_int+0x36/0x160
[  188.653314]  [<ffffffff810e1150>] handle_IRQ_event+0x70/0x180
[  188.653338]  [<ffffffff810e3769>] handle_edge_irq+0xc9/0x170
[  188.653362]  [<ffffffff813b8dff>] __xen_evtchn_do_upcall+0x1bf/0x1f0
[  188.653385]  [<ffffffff813b937d>] xen_evtchn_do_upcall+0x3d/0x60
[  188.653409]  [<ffffffff8101647e>] xen_do_hypervisor_callback+0x1e/0x30
[  188.653431]  <EOI>  [<ffffffff8100940a>] ? hypercall_page+0x40a/0x1010
[  188.653464]  [<ffffffff8100940a>] ? hypercall_page+0x40a/0x1010
[  188.653487]  [<ffffffff813bcee4>] ? xb_write+0x1e4/0x290
[  188.653507]  [<ffffffff813bd95a>] ? xs_talkv+0x6a/0x1f0
[  188.653526]  [<ffffffff813bd968>] ? xs_talkv+0x78/0x1f0
[  188.653546]  [<ffffffff813bdc5d>] ? xs_single+0x4d/0x60
[  188.653565]  [<ffffffff813be592>] ? xenbus_read+0x52/0x80
[  188.653585]  [<ffffffff813c888c>] ? frontend_changed+0x48c/0x770
[  188.653609]  [<ffffffff813bf7fd>] ? xenbus_otherend_changed+0xdd/0x1b0
[  188.653633]  [<ffffffff810111ef>] ? xen_restore_fl_direct_end+0x0/0x1
[  188.653656]  [<ffffffff810ac8c0>] ? lock_release+0xb0/0x230
[  188.653676]  [<ffffffff813bfb70>] ? frontend_changed+0x10/0x20
[  188.653699]  [<ffffffff813bd585>] ? xenwatch_thread+0x55/0x160
[  188.653723]  [<ffffffff810934a0>] ? autoremove_wake_function+0x0/0x40
[  188.653747]  [<ffffffff813bd530>] ? xenwatch_thread+0x0/0x160
[  188.653770]  [<ffffffff81093126>] ? kthread+0x96/0xb0
[  188.653790]  [<ffffffff8101632a>] ? child_rip+0xa/0x20
[  188.653809]  [<ffffffff81015c90>] ? restore_args+0x0/0x30
[  188.653828]  [<ffffffff81016320>] ? child_rip+0x0/0x20
[  188.653846] ---[ end trace ab2eaae7afa5acdb ]---
[  195.184915] vif1.0: no IPv6 routers present

The domU does start and is functional, complete with PCI passthrough.

kern.log repeats the same information, but precedes it with this:


==> kern.log <==
2010-09-15T16:29:40.921979-07:00 kaan-18 [  188.562552] blkback:
ring-ref 8, event-channel 73, protocol 1 (x86_64-abi)
2010-09-15T16:29:40.922202-07:00 kaan-18 [  188.562647]   alloc
irq_desc for 481 on node 0
2010-09-15T16:29:40.922310-07:00 kaan-18 [  188.562652]   alloc
kstat_irqs on node 0
2010-09-15T16:29:40.971943-07:00 kaan-18 [  188.608807]   alloc
irq_desc for 480 on node 0
2010-09-15T16:29:40.972387-07:00 kaan-18 [  188.608813]   alloc
kstat_irqs on node 0
2010-09-15T16:29:41.013027-07:00 kaan-18 [  188.652651]   alloc
irq_desc for 479 on node 0
2010-09-15T16:29:41.013286-07:00 kaan-18 [  188.652657]   alloc
kstat_irqs on node 0

Let me know if there's anything else I can provide.

-Bruce

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