Re: [Xen-devel] Freeze on boot pv domU 2.6.31 with Xen 4.1

[Eric Chanudet <eric@xxxxxxxxxx>]

On Wed, 19 May 2010, Jeremy Fitzhardinge wrote:
> Make sure you have "console=hvc0 earlyprintk=xen ignore_loglevel
> initcall_debug" on your guest kernel command line to see if we can get
> some idea of where its getting up to.
Here is the end of the output on the guest console :
[    0.000999] PCI: System does not support PCI
[    0.000999] PCI: System does not support PCI
[    0.000999] initcall pci_subsys_init+0x0/0x109 returned 0 after 0 usecs
[    0.000999] calling  proto_init+0x0/0x12 @ 1
[    0.000999] initcall proto_init+0x0/0x12 returned 0 after 0 usecs
[    0.000999] calling  net_dev_init+0x0/0x179 @ 1
[    0.000999] initcall net_dev_init+0x0/0x179 returned 0 after 0 usecs
[    0.000999] calling  neigh_init+0x0/0x71 @ 1
[    0.000999] initcall neigh_init+0x0/0x71 returned 0 after 0 usecs
[    0.000999] calling  fib_rules_init+0x0/0xa6 @ 1
[    0.000999] initcall fib_rules_init+0x0/0xa6 returned 0 after 0 usecs
[    0.000999] calling  pktsched_init+0x0/0xc4 @ 1
[    0.000999] initcall pktsched_init+0x0/0xc4 returned 0 after 0 usecs
[    0.000999] calling  tc_filter_init+0x0/0x4c @ 1
[    0.000999] initcall tc_filter_init+0x0/0x4c returned 0 after 0 usecs
[    0.000999] calling  tc_action_init+0x0/0x4c @ 1
[    0.000999] initcall tc_action_init+0x0/0x4c returned 0 after 0 usecs
[    0.000999] calling  genl_init+0x0/0xd8 @ 1

Still nothing wrong on Xen's one :
[    0.000000] Detected 3000.022 MHz processor.
[    0.000999] Console: colour dummy device 80x25
[    0.000999] console [tty0] enabled
[    0.000999] console handover: boot [xenboot0] -> real [hvc0]


Looking further in genetlink.c it seems that the freeze happens in :
synchronize_rcu (af_netlink.c:1540)
netlink_change_ngroups (af_netlink.c:1516)
genl_register_mc_group (genetlink.c:136)
genl_init (genetlink.c:800)

synchronize_rcu does not return after a very long time.

--
Eric Chanudet

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