Re: khugepaged cannot be freezed on 3.2-rc1

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On 11/13/2011 08:12 PM, Maciej Marcin Piechotka wrote:
> I am sorry if I've sent to wrong address. It seems that bug reporting
> resources - bugzilla & "Reporting bugs for the Linux kernel" page - are
> (still?) down. I followed the latter from web archive).
>

Adding linux-pm mailing list to CC.
Andrea Arcangeli has written a patch to solve khugepaged freezing issue.
https://lkml.org/lkml/2011/11/9/312

Can you check if that patch solves the issue for you too?

Thanks,
Srivatsa S. Bhat

> When I try to suspend the computer the khugepaged refuses to be
> suspended:
> 
> [10531.788922] PM: Syncing filesystems ... done.
> [10532.617226] Freezing user space processes ... (elapsed 0.01 seconds)
> done.
> [10532.629073] Freezing remaining freezable tasks ... 
> [10552.638137] Freezing of tasks failed after 20.00 seconds (1 tasks
> refusing to freeze, wq_busy=0):
> [10552.638155] khugepaged      R  running task        0    21      2
> 0x00800000
> [10552.638159]  ffffea000072c740 000000000000ce01 ffffffff81093f56
> ffffffff8166f680
> [10552.638163]  ffffffff8102bbd0 0000000000000001 ffffffff8102bc65
> ffffea000072c140
> [10552.638166]  ffffea000072c1c0 ffffea000072c180 ffffffff8108cbc1
> ffffea000032b700
> [10552.638170] Call Trace:
> [10552.638177]  [<ffffffff81093f56>] ? vma_prio_tree_next+0x3c/0xd5
> [10552.638181]  [<ffffffff810a2798>] ? try_to_unmap_file+0x4a7/0x4bd
> [10552.638184]  [<ffffffff8108cbc1>] ? ____pagevec_lru_add_fn+0x58/0x9a
> [10552.638188]  [<ffffffff810ad11d>] ? compaction_alloc+0x132/0x24f
> [10552.638191]  [<ffffffff810b26f8>] ? migrate_pages+0xa6/0x335
> [10552.638194]  [<ffffffff810acfeb>] ? pfn_valid.part.3+0x32/0x32
> [10552.638197]  [<ffffffff810ad6b2>] ? compact_zone+0x3f4/0x5c3
> [10552.638200]  [<ffffffff810ad9a2>] ? try_to_compact_pages+0x121/0x17e
> [10552.638203]  [<ffffffff8108a2f1>] ? __alloc_pages_direct_compact
> +0xaa/0x197
> [10552.638206]  [<ffffffff8108aa44>] ? __alloc_pages_nodemask
> +0x666/0x6c7
> [10552.638210]  [<ffffffff8102bbd0>] ? get_parent_ip+0x9/0x1b
> [10552.638214]  [<ffffffff81348964>] ? _raw_spin_lock_irqsave+0x13/0x34
> [10552.638217]  [<ffffffff810b2e12>] ? khugepaged_alloc_hugepage
> +0x4c/0xdb
> [10552.638220]  [<ffffffff81047ab9>] ? add_wait_queue+0x3c/0x3c
> [10552.638222]  [<ffffffff810b33fd>] ? khugepaged+0x7c/0xe04
> [10552.638225]  [<ffffffff81047ab9>] ? add_wait_queue+0x3c/0x3c
> [10552.638228]  [<ffffffff810b3381>] ? add_mm_counter.constprop.50
> +0x9/0x9
> [10552.638230]  [<ffffffff810474ee>] ? kthread+0x76/0x7e
> [10552.638233]  [<ffffffff8134b274>] ? kernel_thread_helper+0x4/0x10
> [10552.638236]  [<ffffffff81047478>] ? kthread_worker_fn+0x139/0x139
> [10552.638238]  [<ffffffff8134b270>] ? gs_change+0xb/0xb
> [10552.638347] 
> [10552.638348] Restarting tasks ... done.
> 
> Regards
> 

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