Re: PID namespaces break initrd+hibernate combination?

[Sukadev Bhattiprolu <sukadev@us.ibm.com>]

Nigel Cunningham wrote:
> Hi all.
>
> Please excuse me if this has already been answered. I'm not currently subscribed to LKML.
>
> I've just been preparing a new tux-on-ice release against Linus' current tree, and encountered a failure to freeze pid 1 when seeking to resume, using an initrd:
>
> [   74.192734] Freezing of tasks failed after 19.99 seconds (1 tasks refusing to freeze):
> [   74.193502]   task                        PC stack   pid father
> [   74.193504] swapper       S ffff810002023030  4968     1      0
> [   74.193512]  ffff81000203fdb0 0000000000000046 ffff810002023040 ffff810003249140
> [   74.194296]  ffff81000203fd80 ffffffff803150a1 ffff81000203fdb0 ffff810002023180
> [   74.195087]  ffff810002023030 0000000000000004 0000000000000001 0000000000000001
> [   74.195860] Call Trace:
> [   74.196123]  [<ffffffff803150a1>] security_task_wait+0x11/0x20
> [   74.196692]  [<ffffffff802320cd>] do_wait+0x51d/0xda0
> [   74.197187]  [<ffffffff802292f0>] default_wake_function+0x0/0x10
> [   74.197772]  [<ffffffff8023297c>] sys_wait4+0x2c/0x30
> [   74.198264]  [<ffffffff805f4bb5>] initrd_load+0x175/0x370
> [   74.198794]  [<ffffffff805f211f>] prepare_namespace+0x8f/0x1d0
> [   74.199362]  [<ffffffff805f174d>] kernel_init+0x1ad/0x2b0
> [   74.199889]  [<ffffffff8047e526>] _spin_unlock_irq+0x26/0x60
> [   74.200439]  [<ffffffff8022afc7>] finish_task_switch+0x67/0xc0
> [   74.201008]  [<ffffffff8020c548>] child_rip+0xa/0x12
> [   74.201494]  [<ffffffff80364770>] acpi_os_acquire_lock+0x9/0xb
> [   74.202063]  [<ffffffff805f15a0>] kernel_init+0x0/0x2b0
> [   74.202570]  [<ffffffff8020c53e>] child_rip+0x0/0x12
>
> I believe it might be related to pid namespaces, but am not completely sure yet (will do a git bisect if needs be).
>   
Hmm. prepare_namespace() seems more about mounting root filesystem and 
less about pid namespace.
but I could be wrong. Do you have any more console messages ? CCing the 
containers list
> So, then, I'm writing to ask: Is this a known issue? Is there any fix already available that I've not found in my googling?
>
> Regards,
>
> Nigel
>