Re: Boot hang after io scheduler registration

[Kai Ruhnau]

Andrew Morton wrote:
> On Sat, 27 Dec 2008 00:35:19 +0100 Kai Ruhnau <kai@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
>   
>> Hi,
>>
>> I have a somewhat weird hang problem when booting all recent kernel
>> versions including 2.6.28: When I boot my system and let grub start the
>> kernel after a 5 second timeout, the system will hang after registering
>> the io schedulers (see below). However, when I choose the default grub
>> entry manually by pressing ENTER in the menu, the kernel does not hang
>> and continues the normal booting process.
>>
>> Below, you can find the place of the hang and an excerpt of the messages
>> that follow on a normal boot as well as some system information.
>>
>> Thanks for your time on this problem.
>>
>> Best regards
>> Kai
>>
>>     
[old dmesg]
> Please add `initcall_debug' to the kernel boot command line.  That
> should tell us which initialisation function is getting stuck.
>   
Sure:

[    0.916827] initcall deadline_init+0x0/0x14 returned 0 after 93 usecs
[    0.916932] calling  cfq_init+0x0/0x9d @ 1
[    0.917055] io scheduler cfq registered (default)
[    0.917154] initcall cfq_init+0x0/0x9d returned 0 after 114 usecs
[    0.917266] calling  percpu_counter_startup+0x0/0x14 @ 1
[    0.917369] initcall percpu_counter_startup+0x0/0x14 returned 0 after
1 usecs
[    0.917480] calling  pci_init+0x0/0x30 @ 1

Hang happens here.

Continuation when pressing ENTER in grub:

[    1.022100] pci 0000:01:00.0: Boot video device
[    1.025022] initcall pci_init+0x0/0x30 returned 0 after 104926 usecs
[    1.025128] calling  pci_proc_init+0x0/0x60 @ 1
[    1.025279] initcall pci_proc_init+0x0/0x60 returned 0 after 49 usecs
[    1.025385] calling  pcie_portdrv_init+0x0/0x42 @ 1
[    1.025553] pcieport-driver 0000:00:02.0: setting latency timer to 64
[    1.025582] pcieport-driver 0000:00:02.0: found MSI capability
[    1.025707] pcieport-driver 0000:00:02.0: irq 319 for MSI/MSI-X
[    1.025716] pci_express 0000:00:02.0:pcie00: allocate port service
[    1.025765] pci_express 0000:00:02.0:pcie03: allocate port service
[    1.025845] pcieport-driver 0000:00:06.0: setting latency timer to 64
[    1.025872] pcieport-driver 0000:00:06.0: found MSI capability
[    1.025992] pcieport-driver 0000:00:06.0: irq 318 for MSI/MSI-X
[    1.026003] pci_express 0000:00:06.0:pcie00: allocate port service
[    1.026050] pci_express 0000:00:06.0:pcie03: allocate port service


Best regards
Kai

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