Date:	Sun, 11 Jan 2015 14:40:35 +0100
From:	Krzysztof Kolasa <kkolasa@...soft.pl>
To:	Vlastimil Babka <vbabka@...e.cz>, linux-mm@...ck.org
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Konstantin Khlebnikov <koct9i@...il.com>,
	Michal Hocko <mhocko@...e.cz>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: probably commit b3d574ae ( Linus github 10-01-2015) causes oops
 after run Android SDK Manager from Eclipse

OK CONFIG_DEBUG_BUGVERBOSE enabled

kernel BUG at mm/rmap.c:399!
this one line added with merged commit b3d574ae
after remove it:
----
diff --git a/mm/rmap.c b/mm/rmap.c
index 71cd5bd..68d115f 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -396,7 +396,6 @@ void unlink_anon_vmas(struct vm_area_struct *vma)
      list_for_each_entry_safe(avc, next, &vma->anon_vma_chain, same_vma) {
          struct anon_vma *anon_vma = avc->anon_vma;

-        BUG_ON(anon_vma->degree);
          put_anon_vma(anon_vma);

          list_del(&avc->same_vma);
----
system working stable and not generate oops.

On 11.01.2015 11:56, Vlastimil Babka wrote:
> Re: subject
>
> why do you think it was this commit? bisection? The commit you point to is
> "Merge branch 'akpm' (patches from Andrew)"
> It's possible that bisection pointed you to this, instead of the proper commit
> though. Luckily, there are only 12 of them and ...
>
> On 01/10/2015 01:15 PM, Krzysztof Kolasa wrote:
>> Jan 10 12:33:57 krzysiek-hp1 kernel: [ 3872.320920] ------------[ cut
>> here ]------------
>> Jan 10 12:33:57 krzysiek-hp1 kernel: [ 3872.320927] Kernel BUG at
>> ffffffff81187f1f [verbose debug info unavailable]
> Could you enable CONFIG_DEBUG_BUGVERBOSE please? This should make the stacktrace
> readable.
>
>> Jan 10 12:33:57 krzysiek-hp1 kernel: [ 3872.320929] invalid opcode: 0000
>> [#3] SMP
>> Jan 10 12:33:57 krzysiek-hp1 kernel: [ 3872.320932] Modules linked in:
>> dm_crypt(E) pci_stub(E) vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE)
>> vboxdrv(OE) c
>> use(E) arc4(E) md4(E) bnep(E) rfcomm(E) bluetooth(E) nls_utf8(E) cifs(E)
>> fscache(E) binfmt_misc(E) fglrx(OE) uvcvideo(E) videobuf2_vmalloc(E)
>> x86_pkg_
>> temp_thermal(E) videobuf2_memops(E) videobuf2_core(E) hp_wmi(E)
>> v4l2_common(E) wl(POE) kvm_intel(E) sparse_keymap(E) videodev(E) kvm(E)
>> ghash_clmulni_
>> intel(E) aesni_intel(E) aes_x86_64(E) lrw(E) gf128mul(E)
>> snd_hda_codec_idt(E) snd_hda_codec_hdmi(E) snd_hda_codec_generic(E)
>> glue_helper(E) ablk_helpe
>> r(E) snd_hda_intel(E) cryptd(E) snd_hda_controller(E) snd_hda_codec(E)
>> snd_hwdep(E) snd_pcm(E) snd_seq_midi(E) snd_seq_midi_event(E)
>> microcode(E) snd_
>> rawmidi(E) snd_seq(E) snd_seq_device(E) snd_timer(E) snd(E) cfg80211(E)
>> soundcore(E) joydev(E) lpc_ich(E) hp_accel(E) wmi(E) serio_raw(E)
>> tpm_infineon
>> (E) lis3lv02d(E) amd_iommu_v2(E) input_polldev(E) video(E) tpm_tis(E)
>> mac_hid(E) parport_pc(E) ppdev(E) coretemp(E) lp(E) parport(E)
>> hid_generic(E) us
>> bhid(E) hid(E) mmc_block(E) psmouse(E) firewire_ohci(E) ahci(E)
>> libahci(E) sdhci_pci(E) e1000e(E) firewire_core(E) sdhci(E) crc_itu_t(E)
>> ptp(E) pps_co
>> re(E)
>> Jan 10 12:33:57 krzysiek-hp1 kernel: [ 3872.320979] CPU: 1 PID: 6871
>> Comm: Sweeper thread Tainted: P      D    OE 3.19.0-rc3-winsoft-x64+ #10
>> Jan 10 12:33:57 krzysiek-hp1 kernel: [ 3872.320981] Hardware name:
>> Hewlett-Packard HP ProBook 6560b/1619, BIOS 68SCE Ver. F.50 08/04/2014
>> Jan 10 12:33:57 krzysiek-hp1 kernel: [ 3872.320983] task:
>> ffff88005d95b1c0 ti: ffff88018ee18000 task.ti: ffff88018ee18000
>> Jan 10 12:33:57 krzysiek-hp1 kernel: [ 3872.320985] RIP:
>> 0010:[<ffffffff81187f1f>]  [<ffffffff81187f1f>] unlink_anon_vmas+0x1af/0x200
> Nevertheless, here we see unlink_anon_vmas, which would strongly point to
> 7a3ef208e662f4b63d ("mm: prevent endless growth of anon_vma hierarchy")
> and we also have another report for that.
>
> Still your stracktrace could be useful to help determining the cause, if you
> enabled the verbose debugging.
>
> Thanks.
>
>
>> Jan 10 12:33:57 krzysiek-hp1 kernel: [ 3872.320993] RSP:
>> 0018:ffff88018ee1bba8  EFLAGS: 00010286
>> Jan 10 12:33:57 krzysiek-hp1 kernel: [ 3872.320994] RAX:
>> ffff880182a47c50 RBX: ffff880182a47c40 RCX: ffff8801b9e1d638
>> Jan 10 12:33:57 krzysiek-hp1 kernel: [ 3872.320996] RDX:
>> 00000000ffffffff RSI: ffff8801abb60630 RDI: ffff8801abb605f0
>> Jan 10 12:33:57 krzysiek-hp1 kernel: [ 3872.320998] RBP:
>> ffff88018ee1bbe8 R08: 00000000f70a2000 R09: 0000000000000000
>> Jan 10 12:33:57 krzysiek-hp1 kernel: [ 3872.321000] R10:
>> ffff880182a47c60 R11: ffffea00060a91c0 R12: ffff8801b9e1d628
>> Jan 10 12:33:57 krzysiek-hp1 kernel: [ 3872.321001] R13:
>> ffff8801b9e1d638 R14: ffff8801abb605f0 R15: ffff8801abb605f0
>> Jan 10 12:33:57 krzysiek-hp1 kernel: [ 3872.321003] FS:
>> 0000000000000000(0000) GS:ffff88023f440000(0000) knlGS:0000000000000000
>> Jan 10 12:33:57 krzysiek-hp1 kernel: [ 3872.321005] CS:  0010 DS: 002b
>> ES: 002b CR0: 0000000080050033
>> Jan 10 12:33:57 krzysiek-hp1 kernel: [ 3872.321007] CR2:
>> 00000000f653e70c CR3: 0000000001c12000 CR4: 00000000000407e0
>> Jan 10 12:33:57 krzysiek-hp1 kernel: [ 3872.321008] Stack:
>> Jan 10 12:33:57 krzysiek-hp1 kernel: [ 3872.321010] ffff8801b9e1d5c0
>> ffff8801abb605f0 ffff88018ee1bbe8 ffff88006a1d70b8
>> Jan 10 12:33:57 krzysiek-hp1 kernel: [ 3872.321013] 00000000a3255000
>> 0000000000000000 ffff88018ee1bc58 ffff8801b9e1d5c0
>> Jan 10 12:33:57 krzysiek-hp1 kernel: [ 3872.321016] ffff88018ee1bc38
>> ffffffff81179b58 ffff88018ee1bc38 0000000000000000
>> Jan 10 12:33:57 krzysiek-hp1 kernel: [ 3872.321019] Call Trace:
>> Jan 10 12:33:57 krzysiek-hp1 kernel: [ 3872.321025] [<ffffffff81179b58>]
>> free_pgtables+0xa8/0x120
>> Jan 10 12:33:57 krzysiek-hp1 kernel: [ 3872.321029] [<ffffffff81183e5f>]
>> exit_mmap+0xdf/0x170
>> Jan 10 12:33:57 krzysiek-hp1 kernel: [ 3872.321033] [<ffffffff81055984>]
>> mmput+0x64/0x130
>> Jan 10 12:33:57 krzysiek-hp1 kernel: [ 3872.321036] [<ffffffff8105ab2f>]
>> do_exit+0x26f/0xb10
>> Jan 10 12:33:57 krzysiek-hp1 kernel: [ 3872.321039] [<ffffffff8105b45f>]
>> do_group_exit+0x3f/0xa0
>> Jan 10 12:33:57 krzysiek-hp1 kernel: [ 3872.321044] [<ffffffff81066d48>]
>> get_signal+0x1d8/0x5f0
>> Jan 10 12:33:57 krzysiek-hp1 kernel: [ 3872.321047] [<ffffffff81002e10>]
>> do_signal+0x20/0x120
>> Jan 10 12:33:57 krzysiek-hp1 kernel: [ 3872.321052] [<ffffffff810d0d01>]
>> ? compat_SyS_futex+0x71/0x140
>> Jan 10 12:33:57 krzysiek-hp1 kernel: [ 3872.321055] [<ffffffff81002f80>]
>> do_notify_resume+0x70/0xa0
>> Jan 10 12:33:57 krzysiek-hp1 kernel: [ 3872.321059] [<ffffffff8171ebc7>]
>> int_signal+0x12/0x17
>> Jan 10 12:33:57 krzysiek-hp1 kernel: [ 3872.321061] Code: 44 24 10 48 8d
>> 50 f0 49 8d 44 24 10 49 39 c5 75 9b 48 83 c4 18 5b 41 5c 41 5d 41 5e 41
>> 5f 5d
>>    c3 0f 1f 40 00 e8 c3 fa ff ff eb 99 <0f> 0b 80 3d ea 8e b6 00 00 74 16
>> 49 8d 7e 08 48 89 55 c8 e8 09
>> Jan 10 12:33:57 krzysiek-hp1 kernel: [ 3872.321088] RIP
>> [<ffffffff81187f1f>] unlink_anon_vmas+0x1af/0x200
>> Jan 10 12:33:57 krzysiek-hp1 kernel: [ 3872.321091]  RSP <ffff88018ee1bba8>
>> Jan 10 12:33:57 krzysiek-hp1 kernel: [ 3872.321094] ---[ end trace
>> 1c9e464233c6be56 ]---
>> Jan 10 12:33:57 krzysiek-hp1 kernel: [ 3872.321096] Fixing recursive
>> fault but reboot is needed!
>>
>> --
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>


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