linux-kernel - 6e543d5780e fixed a boot hang

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Date:	Wed, 9 Oct 2013 22:12:17 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Lisa Du <cldu@...vell.com>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: 6e543d5780e fixed a boot hang

Greetings,

FYI, this commit seem to fix a boot hang problem here.

commit 6e543d5780e36ff5ee56c44d7e2e30db3457a7ed
Author: Lisa Du <cldu@...vell.com>
Date:   Wed Sep 11 14:22:36 2013 -0700

    mm: vmscan: fix do_try_to_free_pages() livelock


        [    1.394871] pci 0000:00:02.0: Boot video device
        [    1.395883] PCI: CLS 0 bytes, default 64

In parent commit, it will hang right here.

With this commit, it will continue to emit the below OOM messages
(which is not a surprise to me because the boot test runs in a small
memory KVM and the kconfig builds in lots of drivers).

        [    1.631892] swapper/0 invoked oom-killer: gfp_mask=0x2000d0, order=1, oom_score_adj=0
        [    1.633549] swapper/0 cpuset=/ mems_allowed=0
        [    1.634443] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 3.12.0-rc4-00019-g8b5ede6 #126
        [    1.635982] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
        [    1.637088]  0000000000000002 ffff88001dd41b28 ffffffff82c8d78f ffff88001ef7c040
        [    1.638955]  ffff88001dd41ba8 ffffffff82c8395f ffffffff83c54680 ffff88001dd41b60
        [    1.640830]  ffffffff810f3f06 0000000000001eb4 0000000000000246 ffff88001dd41b98
        [    1.642687] Call Trace:
        [    1.643313]  [<ffffffff82c8d78f>] dump_stack+0x54/0x74
        [    1.644331]  [<ffffffff82c8395f>] dump_header.isra.10+0x7a/0x1ba
        [    1.645443]  [<ffffffff810f3f06>] ? lock_release_holdtime.part.27+0x4c/0x50
        [    1.646685]  [<ffffffff810f795a>] ? lock_release+0x189/0x1d1
        [    1.647744]  [<ffffffff811530a8>] out_of_memory+0x39e/0x3ee
        [    1.648882]  [<ffffffff811579f5>] __alloc_pages_nodemask+0x668/0x7de
        [    1.650385]  [<ffffffff8118eb53>] kmem_getpages+0x75/0x16c
        [    1.651429]  [<ffffffff81190d20>] fallback_alloc+0x12c/0x1ea
        [    1.652528]  [<ffffffff810f38e8>] ? trace_hardirqs_off+0xd/0xf
        [    1.653627]  [<ffffffff81190be5>] ____cache_alloc_node+0x14a/0x159
        [    1.654783]  [<ffffffff817059fb>] ? dma_debug_init+0x1ef/0x29a
        [    1.655928]  [<ffffffff8119162c>] kmem_cache_alloc_trace+0x83/0x11a
        [    1.657108]  [<ffffffff817059fb>] dma_debug_init+0x1ef/0x29a
        [    1.658182]  [<ffffffff841ac38b>] pci_iommu_init+0x16/0x52
        [    1.659263]  [<ffffffff841ac375>] ? iommu_setup+0x27d/0x27d
        [    1.660342]  [<ffffffff810020d2>] do_one_initcall+0x93/0x137
        [    1.661415]  [<ffffffff810bd300>] ? param_set_charp+0x92/0xd8
        [    1.662503]  [<ffffffff810bd52e>] ? parse_args+0x189/0x247
        [    1.663555]  [<ffffffff8419fed1>] kernel_init_freeable+0x15e/0x1df
        [    1.664724]  [<ffffffff8419f729>] ? do_early_param+0x88/0x88
        [    1.665814]  [<ffffffff82c77867>] ? rest_init+0xdb/0xdb
        [    1.666824]  [<ffffffff82c77875>] kernel_init+0xe/0xdb
        [    1.667824]  [<ffffffff82cbc57c>] ret_from_fork+0x7c/0xb0
        [    1.668911]  [<ffffffff82c77867>] ? rest_init+0xdb/0xdb
        [    1.669925] Mem-Info:
        [    1.670508] Node 0 DMA per-cpu:

Thanks,
Fengguang

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