* Re: kernel 3.18.10: THP refcounting bug
[not found] ` <20150401113122.GA17153@node.dhcp.inet.fi>
@ 2015-04-01 11:53 ` Stefan Priebe - Profihost AG
2015-04-01 13:41 ` Kirill A. Shutemov
[not found] ` <551BDB8F.4070707@profihost.ag>
1 sibling, 1 reply; 5+ messages in thread
From: Stefan Priebe - Profihost AG @ 2015-04-01 11:53 UTC (permalink / raw)
To: linux-mm; +Cc: Kirill A. Shutemov, sasha.levin
Hi,
while using 3.18.9 i got several times the following stack trace:
kernel BUG at mm/filemap.c:203!
invalid opcode: 0000 [#1] SMP
Modules linked in: dm_mod netconsole usbhid sd_mod sg ata_generic
virtio_net virtio_scsi uhci_hcd ehci_hcd usbcore virtio_pci usb_common
virtio_ring ata_piix virtio floppy
CPU: 3 PID: 1 Comm: busybox Tainted: G B 3.18.9 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
rel-1.7.5.1-0-g8936dbb-20141113_115728-nilsson.home.kraxel.org 04/01/2014
task: ffff880137b98000 ti: ffff880137b94000 task.ti: ffff880137b94000
RIP: 0010:[<ffffffff81134495>] [<ffffffff81134495>]
__delete_from_page_cache+0x2b5/0x2c0
RSP: 0018:ffff880137b97be8 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00000000ffffffd0
RDX: 0000000000000030 RSI: 000000000000000a RDI: ffff88013f9696c0
RBP: ffff880137b97c38 R08: 0000000000000000 R09: ffffea0002e927c0
R10: ffff8800bba92da0 R11: ffff880137b97c00 R12: ffffea0002e92480
R13: ffff8800bba8c4c8 R14: 0000000000000000 R15: ffff8800bba8c4d0
FS: 00007f5a79e0b700(0000) GS:ffff880139060000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000023c3138 CR3: 00000000b84ba000 CR4: 00000000000006e0
Stack:
000000000000000e ffff880137b97d48 ffff8800bba92da0 ffff8800bba92dc8
ffff880137b97c68 ffffea0002e92480 ffff8800bba8c4c8 0000000000000000
0000000000000000 0000000000000000 ffff880137b97c68 ffffffff81134604
Call Trace:
[<ffffffff81134604>] delete_from_page_cache+0x44/0x70
[<ffffffff811413cb>] truncate_inode_page+0x5b/0x90
[<ffffffff811415a4>] truncate_inode_pages_range+0x1a4/0x6c0
[<ffffffff81141b45>] truncate_inode_pages+0x15/0x20
[<ffffffff81141c4c>] truncate_inode_pages_final+0x3c/0x50
[<ffffffff811bb83c>] evict+0x16c/0x180
[<ffffffff811bbed5>] iput+0x105/0x190
[<ffffffff811b0c19>] do_unlinkat+0x189/0x2b0
[<ffffffff811b1a46>] SyS_unlink+0x16/0x20
[<ffffffff815f6592>] system_call_fastpath+0x12/0x17
Code: 66 0f 1f 44 00 00 48 8b 75 c0 4c 89 ff e8 e4 5d 1f 00 84 c0 0f 85
5e fe ff ff e9 41 fe ff ff 0f 1f 80 00 00 00 00 e8 75 70 4b 00 <0f> 0b
66 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 83 e2 fd 48
RIP [<ffffffff81134495>] __delete_from_page_cache+0x2b5/0x2c0
RSP <ffff880137b97be8>
---[ end trace a4727cb71335dbd4 ]---
Is this a known bug?
Thanks!
--
Greets,
Stefan
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^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: kernel 3.18.10: THP refcounting bug
2015-04-01 11:53 ` kernel 3.18.10: THP refcounting bug Stefan Priebe - Profihost AG
@ 2015-04-01 13:41 ` Kirill A. Shutemov
2015-04-01 20:09 ` Hugh Dickins
2015-04-01 20:10 ` Konstantin Khlebnikov
0 siblings, 2 replies; 5+ messages in thread
From: Kirill A. Shutemov @ 2015-04-01 13:41 UTC (permalink / raw)
To: Stefan Priebe - Profihost AG
Cc: linux-mm, sasha.levin, Hugh Dickins, Konstantin Khlebnikov
On Wed, Apr 01, 2015 at 01:53:51PM +0200, Stefan Priebe - Profihost AG wrote:
> Hi,
>
> while using 3.18.9 i got several times the following stack trace:
>
> kernel BUG at mm/filemap.c:203!
> invalid opcode: 0000 [#1] SMP
> Modules linked in: dm_mod netconsole usbhid sd_mod sg ata_generic
> virtio_net virtio_scsi uhci_hcd ehci_hcd usbcore virtio_pci usb_common
> virtio_ring ata_piix virtio floppy
> CPU: 3 PID: 1 Comm: busybox Tainted: G B 3.18.9 #1
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
> rel-1.7.5.1-0-g8936dbb-20141113_115728-nilsson.home.kraxel.org 04/01/2014
> task: ffff880137b98000 ti: ffff880137b94000 task.ti: ffff880137b94000
> RIP: 0010:[<ffffffff81134495>] [<ffffffff81134495>]
> __delete_from_page_cache+0x2b5/0x2c0
> RSP: 0018:ffff880137b97be8 EFLAGS: 00010046
> RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00000000ffffffd0
> RDX: 0000000000000030 RSI: 000000000000000a RDI: ffff88013f9696c0
> RBP: ffff880137b97c38 R08: 0000000000000000 R09: ffffea0002e927c0
> R10: ffff8800bba92da0 R11: ffff880137b97c00 R12: ffffea0002e92480
> R13: ffff8800bba8c4c8 R14: 0000000000000000 R15: ffff8800bba8c4d0
> FS: 00007f5a79e0b700(0000) GS:ffff880139060000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00000000023c3138 CR3: 00000000b84ba000 CR4: 00000000000006e0
> Stack:
> 000000000000000e ffff880137b97d48 ffff8800bba92da0 ffff8800bba92dc8
> ffff880137b97c68 ffffea0002e92480 ffff8800bba8c4c8 0000000000000000
> 0000000000000000 0000000000000000 ffff880137b97c68 ffffffff81134604
> Call Trace:
> [<ffffffff81134604>] delete_from_page_cache+0x44/0x70
> [<ffffffff811413cb>] truncate_inode_page+0x5b/0x90
> [<ffffffff811415a4>] truncate_inode_pages_range+0x1a4/0x6c0
> [<ffffffff81141b45>] truncate_inode_pages+0x15/0x20
> [<ffffffff81141c4c>] truncate_inode_pages_final+0x3c/0x50
> [<ffffffff811bb83c>] evict+0x16c/0x180
> [<ffffffff811bbed5>] iput+0x105/0x190
> [<ffffffff811b0c19>] do_unlinkat+0x189/0x2b0
> [<ffffffff811b1a46>] SyS_unlink+0x16/0x20
> [<ffffffff815f6592>] system_call_fastpath+0x12/0x17
> Code: 66 0f 1f 44 00 00 48 8b 75 c0 4c 89 ff e8 e4 5d 1f 00 84 c0 0f 85
> 5e fe ff ff e9 41 fe ff ff 0f 1f 80 00 00 00 00 e8 75 70 4b 00 <0f> 0b
> 66 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 83 e2 fd 48
> RIP [<ffffffff81134495>] __delete_from_page_cache+0x2b5/0x2c0
> RSP <ffff880137b97be8>
> ---[ end trace a4727cb71335dbd4 ]---
>
> Is this a known bug?
+Hugh, Konstantin.
Nothing I recognize. Looks somewhat like[1], but not really.
Do you have a way to reproduce? What fs it was?
[1] lkml.kernel.org/g/20140603042121.GA27177@redhat.com
--
Kirill A. Shutemov
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^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: kernel 3.18.10: THP refcounting bug
2015-04-01 13:41 ` Kirill A. Shutemov
@ 2015-04-01 20:09 ` Hugh Dickins
2015-04-01 20:10 ` Konstantin Khlebnikov
1 sibling, 0 replies; 5+ messages in thread
From: Hugh Dickins @ 2015-04-01 20:09 UTC (permalink / raw)
To: Kirill A. Shutemov
Cc: Stefan Priebe - Profihost AG, linux-mm, sasha.levin, Hugh Dickins,
Konstantin Khlebnikov
On Wed, 1 Apr 2015, Kirill A. Shutemov wrote:
> On Wed, Apr 01, 2015 at 01:53:51PM +0200, Stefan Priebe - Profihost AG wrote:
> > Hi,
> >
> > while using 3.18.9 i got several times the following stack trace:
> >
> > kernel BUG at mm/filemap.c:203!
> > invalid opcode: 0000 [#1] SMP
> > Modules linked in: dm_mod netconsole usbhid sd_mod sg ata_generic
> > virtio_net virtio_scsi uhci_hcd ehci_hcd usbcore virtio_pci usb_common
> > virtio_ring ata_piix virtio floppy
> > CPU: 3 PID: 1 Comm: busybox Tainted: G B 3.18.9 #1
The "B" in that Tainted string means that earlier Stefan got a
"Bad page" report. Please look for that in /var/log/messages,
and post us what it said.
It's not at all surprising to hit a BUG_ON(page_mapped(page)) after we
already know that the page refcounting is messed up; though of course
it's possible that the two are unrelated (and perhaps weeks apart).
> > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
> > rel-1.7.5.1-0-g8936dbb-20141113_115728-nilsson.home.kraxel.org 04/01/2014
> > task: ffff880137b98000 ti: ffff880137b94000 task.ti: ffff880137b94000
> > RIP: 0010:[<ffffffff81134495>] [<ffffffff81134495>]
> > __delete_from_page_cache+0x2b5/0x2c0
> > RSP: 0018:ffff880137b97be8 EFLAGS: 00010046
> > RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00000000ffffffd0
> > RDX: 0000000000000030 RSI: 000000000000000a RDI: ffff88013f9696c0
> > RBP: ffff880137b97c38 R08: 0000000000000000 R09: ffffea0002e927c0
> > R10: ffff8800bba92da0 R11: ffff880137b97c00 R12: ffffea0002e92480
> > R13: ffff8800bba8c4c8 R14: 0000000000000000 R15: ffff8800bba8c4d0
> > FS: 00007f5a79e0b700(0000) GS:ffff880139060000(0000) knlGS:0000000000000000
> > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > CR2: 00000000023c3138 CR3: 00000000b84ba000 CR4: 00000000000006e0
> > Stack:
> > 000000000000000e ffff880137b97d48 ffff8800bba92da0 ffff8800bba92dc8
> > ffff880137b97c68 ffffea0002e92480 ffff8800bba8c4c8 0000000000000000
> > 0000000000000000 0000000000000000 ffff880137b97c68 ffffffff81134604
> > Call Trace:
> > [<ffffffff81134604>] delete_from_page_cache+0x44/0x70
> > [<ffffffff811413cb>] truncate_inode_page+0x5b/0x90
> > [<ffffffff811415a4>] truncate_inode_pages_range+0x1a4/0x6c0
> > [<ffffffff81141b45>] truncate_inode_pages+0x15/0x20
> > [<ffffffff81141c4c>] truncate_inode_pages_final+0x3c/0x50
> > [<ffffffff811bb83c>] evict+0x16c/0x180
> > [<ffffffff811bbed5>] iput+0x105/0x190
> > [<ffffffff811b0c19>] do_unlinkat+0x189/0x2b0
> > [<ffffffff811b1a46>] SyS_unlink+0x16/0x20
> > [<ffffffff815f6592>] system_call_fastpath+0x12/0x17
> > Code: 66 0f 1f 44 00 00 48 8b 75 c0 4c 89 ff e8 e4 5d 1f 00 84 c0 0f 85
> > 5e fe ff ff e9 41 fe ff ff 0f 1f 80 00 00 00 00 e8 75 70 4b 00 <0f> 0b
> > 66 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 83 e2 fd 48
> > RIP [<ffffffff81134495>] __delete_from_page_cache+0x2b5/0x2c0
> > RSP <ffff880137b97be8>
> > ---[ end trace a4727cb71335dbd4 ]---
> >
> > Is this a known bug?
>
> +Hugh, Konstantin.
>
> Nothing I recognize. Looks somewhat like[1], but not really.
>
> Do you have a way to reproduce? What fs it was?
>
> [1] lkml.kernel.org/g/20140603042121.GA27177@redhat.com
I put a lot of thought into that one, but never found a convincing
answer. Either it went away, or Dave grew tired of re-reporting it
and getting no fix.
For an instant, I wondered if your recent discovery of page mapcount
being used for two purposes on a compound tail could account for these;
but I don't think so, Stefan's stacktrace shows we're dealing with an
ordinary filesystem page, which should be neither compound nor tail.
Hugh
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^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: kernel 3.18.10: THP refcounting bug
2015-04-01 13:41 ` Kirill A. Shutemov
2015-04-01 20:09 ` Hugh Dickins
@ 2015-04-01 20:10 ` Konstantin Khlebnikov
1 sibling, 0 replies; 5+ messages in thread
From: Konstantin Khlebnikov @ 2015-04-01 20:10 UTC (permalink / raw)
To: Kirill A. Shutemov
Cc: Stefan Priebe - Profihost AG, linux-mm@kvack.org, Sasha Levin,
Hugh Dickins
On Wed, Apr 1, 2015 at 4:41 PM, Kirill A. Shutemov <kirill@shutemov.name> wrote:
> On Wed, Apr 01, 2015 at 01:53:51PM +0200, Stefan Priebe - Profihost AG wrote:
>> Hi,
>>
>> while using 3.18.9 i got several times the following stack trace:
>>
>> kernel BUG at mm/filemap.c:203!
>> invalid opcode: 0000 [#1] SMP
>> Modules linked in: dm_mod netconsole usbhid sd_mod sg ata_generic
>> virtio_net virtio_scsi uhci_hcd ehci_hcd usbcore virtio_pci usb_common
>> virtio_ring ata_piix virtio floppy
>> CPU: 3 PID: 1 Comm: busybox Tainted: G B 3.18.9 #1
As I see this isn't first oops -> kernel already tainted with 'B'
Bad-page-state.
Please look at first splash where is no 'B' flag.
>> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
>> rel-1.7.5.1-0-g8936dbb-20141113_115728-nilsson.home.kraxel.org 04/01/2014
>> task: ffff880137b98000 ti: ffff880137b94000 task.ti: ffff880137b94000
>> RIP: 0010:[<ffffffff81134495>] [<ffffffff81134495>]
>> __delete_from_page_cache+0x2b5/0x2c0
>> RSP: 0018:ffff880137b97be8 EFLAGS: 00010046
>> RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00000000ffffffd0
>> RDX: 0000000000000030 RSI: 000000000000000a RDI: ffff88013f9696c0
>> RBP: ffff880137b97c38 R08: 0000000000000000 R09: ffffea0002e927c0
>> R10: ffff8800bba92da0 R11: ffff880137b97c00 R12: ffffea0002e92480
>> R13: ffff8800bba8c4c8 R14: 0000000000000000 R15: ffff8800bba8c4d0
>> FS: 00007f5a79e0b700(0000) GS:ffff880139060000(0000) knlGS:0000000000000000
>> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> CR2: 00000000023c3138 CR3: 00000000b84ba000 CR4: 00000000000006e0
>> Stack:
>> 000000000000000e ffff880137b97d48 ffff8800bba92da0 ffff8800bba92dc8
>> ffff880137b97c68 ffffea0002e92480 ffff8800bba8c4c8 0000000000000000
>> 0000000000000000 0000000000000000 ffff880137b97c68 ffffffff81134604
>> Call Trace:
>> [<ffffffff81134604>] delete_from_page_cache+0x44/0x70
>> [<ffffffff811413cb>] truncate_inode_page+0x5b/0x90
>> [<ffffffff811415a4>] truncate_inode_pages_range+0x1a4/0x6c0
>> [<ffffffff81141b45>] truncate_inode_pages+0x15/0x20
>> [<ffffffff81141c4c>] truncate_inode_pages_final+0x3c/0x50
>> [<ffffffff811bb83c>] evict+0x16c/0x180
>> [<ffffffff811bbed5>] iput+0x105/0x190
>> [<ffffffff811b0c19>] do_unlinkat+0x189/0x2b0
>> [<ffffffff811b1a46>] SyS_unlink+0x16/0x20
>> [<ffffffff815f6592>] system_call_fastpath+0x12/0x17
>> Code: 66 0f 1f 44 00 00 48 8b 75 c0 4c 89 ff e8 e4 5d 1f 00 84 c0 0f 85
>> 5e fe ff ff e9 41 fe ff ff 0f 1f 80 00 00 00 00 e8 75 70 4b 00 <0f> 0b
>> 66 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 83 e2 fd 48
>> RIP [<ffffffff81134495>] __delete_from_page_cache+0x2b5/0x2c0
>> RSP <ffff880137b97be8>
>> ---[ end trace a4727cb71335dbd4 ]---
>>
>> Is this a known bug?
>
> +Hugh, Konstantin.
>
> Nothing I recognize. Looks somewhat like[1], but not really.
>
> Do you have a way to reproduce? What fs it was?
>
> [1] lkml.kernel.org/g/20140603042121.GA27177@redhat.com
>
> --
> Kirill A. Shutemov
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^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: kernel 3.18.10: THP refcounting bug
[not found] ` <551C39EE.90504@profihost.ag>
@ 2015-04-01 20:13 ` Sasha Levin
0 siblings, 0 replies; 5+ messages in thread
From: Sasha Levin @ 2015-04-01 20:13 UTC (permalink / raw)
To: Stefan Priebe
Cc: Kirill A. Shutemov, linux-mm@kvack.org, Hugh Dickins,
Konstantin Khlebnikov
linux-mm@ was incorrect in the original mail so this ended up getting around
just between us.
Below is Stefan's response to my question about the 'B' taint flag.
On 04/01/2015 02:33 PM, Stefan Priebe wrote:
>
> Am 01.04.2015 um 17:46 schrieb Sasha Levin:
>> On 04/01/2015 07:50 AM, Stefan Priebe - Profihost AG wrote:
>>> Hi,
>>>
>>> while using 3.18.9 i got several times the following stack trace:
>>>
>>> kernel BUG at mm/filemap.c:203!
>>> invalid opcode: 0000 [#1] SMP
>>> Modules linked in: dm_mod netconsole usbhid sd_mod sg ata_generic
>>> virtio_net virtio_scsi uhci_hcd ehci_hcd usbcore virtio_pci usb_common
>>> virtio_ring ata_piix virtio floppy
>>> CPU: 3 PID: 1 Comm: busybox Tainted: G B 3.18.9 #1
>>
>> Looking at the taint flags, was there anything else before this that
>> could set the 'B' flag?
>
> oh i'm sorry you're correct before that one i see (happens on shutdown):
>
> BUG: Bad page map in process udevd pte:ba4a2025 pmd:ba275067
> page:ffffea0002e92880 count:1 mapcount:-1 mapping:ffff8800bba8c4c8 index:0x10
> flags: 0x1fffff8000007c(referenced|uptodate|dirty|lru|active)
> page dumped because: bad pte
> addr:0000000000410000 vm_flags:00000875 anon_vma: (null) mapping:ffff8800bba8c4c8 index:10
> vma->vm_ops->fault: filemap_fault+0x0/0x480
> vma->vm_file->f_op->mmap: generic_file_mmap+0x0/0x60
> CPU: 7 PID: 105 Comm: udevd Not tainted 3.18.9+14-ph #1
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.7.5.1-0-g8936dbb-20141113_115728-nilsson.home.kraxel.org 04/01/201
> 4
> ffff880136ca58c0 ffff8800b9c8bc58 ffffffff815f0732 00000000072b072b
> 0000000000410000 ffff8800b9c8bca8 ffffffff8115b5b6 00000000ba4a2025
> 0000000000000010 ffff8800b9c8bca8 0000000000424000 ffff8800ba275080
> Call Trace:
> [<ffffffff815f0732>] dump_stack+0x46/0x58
> [<ffffffff8115b5b6>] print_bad_pte+0x196/0x240
> [<ffffffff8115d3c9>] unmap_single_vma+0x729/0x7f0
> [<ffffffff8115d801>] unmap_vmas+0x51/0xa0
> [<ffffffff811666c5>] exit_mmap+0xc5/0x170
> [<ffffffff810713c5>] mmput+0x55/0x100
> [<ffffffff8107631d>] do_exit+0x25d/0xa30
> [<ffffffff8116552f>] ? do_munmap+0x30f/0x3b0
> [<ffffffff81076b7f>] do_group_exit+0x3f/0xa0
> [<ffffffff81076bf7>] SyS_exit_group+0x17/0x20
> [<ffffffff815f6592>] system_call_fastpath+0x12/0x17
> Disabling lock debugging due to kernel taint
> BUG: Bad page state in process udevd pfn:ba4a2
> page:ffffea0002e92880 count:0 mapcount:-1 mapping:ffff8800bba8c4c8 index:0x10
> flags: 0x1fffff8000001c(referenced|uptodate|dirty)
> page dumped because: non-NULL mapping
> Modules linked in: dm_mod netconsole usbhid sd_mod sg ata_generic virtio_net virtio_scsi uhci_hcd ehci_hcd usbcore virtio_pci usb_co
> mmon virtio_ring ata_piix virtio floppy
> CPU: 7 PID: 105 Comm: udevd Tainted: G B 3.18.9+14-ph #1
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.7.5.1-0-g8936dbb-20141113_115728-nilsson.home.kraxel.org 04/01/201
> 4
> ffffffff81805618 ffff8800b9c8bba8 ffffffff815f0732 0000000007700770
> ffffea0002e92880 ffff8800b9c8bbd8 ffffffff815eb801 0000000000000000
> ffffea0002e92880 0000000000000000 000fffff80000000 ffff8800b9c8bc28
> Call Trace:
> [<ffffffff815f0732>] dump_stack+0x46/0x58
> [<ffffffff815eb801>] bad_page+0xf7/0x115
> [<ffffffff81137c22>] free_pages_prepare+0x152/0x180
> [<ffffffff8113a130>] free_hot_cold_page+0x40/0x160
> [<ffffffff8113a29e>] free_hot_cold_page_list+0x4e/0xa0
> [<ffffffff8113fcd3>] release_pages+0x1f3/0x280
> [<ffffffff8117142d>] free_pages_and_swap_cache+0x8d/0xa0
> [<ffffffff8115b6c4>] tlb_flush_mmu_free+0x34/0x60
> [<ffffffff8115bbe4>] tlb_flush_mmu+0x24/0x30
> [<ffffffff8115bc04>] tlb_finish_mmu+0x14/0x40
> [<ffffffff811666f4>] exit_mmap+0xf4/0x170
> [<ffffffff810713c5>] mmput+0x55/0x100
> [<ffffffff8107631d>] do_exit+0x25d/0xa30
> [<ffffffff8116552f>] ? do_munmap+0x30f/0x3b0
> [<ffffffff81076b7f>] do_group_exit+0x3f/0xa0
> [<ffffffff81076bf7>] SyS_exit_group+0x17/0x20
> [<ffffffff815f6592>] system_call_fastpath+0x12/0x17
> ------------[ cut here ]------------
>
>
> Stefan
>
>>
>>
>> Thanks,
>> Sasha
>>
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2015-04-01 11:53 ` kernel 3.18.10: THP refcounting bug Stefan Priebe - Profihost AG
2015-04-01 13:41 ` Kirill A. Shutemov
2015-04-01 20:09 ` Hugh Dickins
2015-04-01 20:10 ` Konstantin Khlebnikov
[not found] ` <551BDB8F.4070707@profihost.ag>
[not found] ` <551C12CC.3000803@oracle.com>
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2015-04-01 20:13 ` Sasha Levin
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