Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On 25 February 2016 at 16:01, Kirill A. Shutemov wrote: > On Thu, Feb 25, 2016 at 03:49:33PM +, Steve Capper wrote: >> On 23 February 2016 at 18:47, Will Deacon wrote: >> > [adding Steve, since he worked on THP for 32-bit ARM] >> >> Apologies for my

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On 25 February 2016 at 16:01, Kirill A. Shutemov wrote: > On Thu, Feb 25, 2016 at 03:49:33PM +, Steve Capper wrote: >> On 23 February 2016 at 18:47, Will Deacon wrote: >> > [adding Steve, since he worked on THP for 32-bit ARM] >> >> Apologies for my late reply... >> >> > >> > On Tue, Feb 23,

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Thu, Feb 25, 2016 at 03:49:33PM +, Steve Capper wrote: > On 23 February 2016 at 18:47, Will Deacon wrote: > > [adding Steve, since he worked on THP for 32-bit ARM] > > Apologies for my late reply... > > > > > On Tue, Feb 23, 2016 at 07:19:07PM +0100, Gerald Schaefer

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Thu, Feb 25, 2016 at 03:49:33PM +, Steve Capper wrote: > On 23 February 2016 at 18:47, Will Deacon wrote: > > [adding Steve, since he worked on THP for 32-bit ARM] > > Apologies for my late reply... > > > > > On Tue, Feb 23, 2016 at 07:19:07PM +0100, Gerald Schaefer wrote: > >> On Tue,

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On 23 February 2016 at 18:47, Will Deacon wrote: > [adding Steve, since he worked on THP for 32-bit ARM] Apologies for my late reply... > > On Tue, Feb 23, 2016 at 07:19:07PM +0100, Gerald Schaefer wrote: >> On Tue, 23 Feb 2016 13:32:21 +0300 >> "Kirill A. Shutemov"

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On 23 February 2016 at 18:47, Will Deacon wrote: > [adding Steve, since he worked on THP for 32-bit ARM] Apologies for my late reply... > > On Tue, Feb 23, 2016 at 07:19:07PM +0100, Gerald Schaefer wrote: >> On Tue, 23 Feb 2016 13:32:21 +0300 >> "Kirill A. Shutemov" wrote: >> > The theory is

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

Christian Borntraeger writes: > On 02/24/2016 11:41 AM, Will Deacon wrote: >> On Wed, Feb 24, 2016 at 11:16:34AM +0100, Christian Borntraeger wrote: >>> On 02/23/2016 09:22 PM, Will Deacon wrote: On Tue, Feb 23, 2016 at 10:33:45PM +0300, Kirill A. Shutemov wrote:

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

Christian Borntraeger writes: > On 02/24/2016 11:41 AM, Will Deacon wrote: >> On Wed, Feb 24, 2016 at 11:16:34AM +0100, Christian Borntraeger wrote: >>> On 02/23/2016 09:22 PM, Will Deacon wrote: On Tue, Feb 23, 2016 at 10:33:45PM +0300, Kirill A. Shutemov wrote: > On Tue, Feb 23, 2016

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Tue, 23 Feb 2016 22:33:45 +0300 "Kirill A. Shutemov" wrote: > On Tue, Feb 23, 2016 at 07:19:07PM +0100, Gerald Schaefer wrote: > > I'll check with Martin, maybe it is actually trivial, then we can > > do a quick test it to rule that one out. > > Oh. I found a bug in

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Tue, 23 Feb 2016 22:33:45 +0300 "Kirill A. Shutemov" wrote: > On Tue, Feb 23, 2016 at 07:19:07PM +0100, Gerald Schaefer wrote: > > I'll check with Martin, maybe it is actually trivial, then we can > > do a quick test it to rule that one out. > > Oh. I found a bug in

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Wed, 24 Feb 2016, Martin Schwidefsky wrote: > On Tue, 23 Feb 2016 22:33:45 +0300 > "Kirill A. Shutemov" wrote: > > > On Tue, Feb 23, 2016 at 07:19:07PM +0100, Gerald Schaefer wrote: > > > I'll check with Martin, maybe it is actually trivial, then we can > > > do a quick

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Wed, 24 Feb 2016, Martin Schwidefsky wrote: > On Tue, 23 Feb 2016 22:33:45 +0300 > "Kirill A. Shutemov" wrote: > > > On Tue, Feb 23, 2016 at 07:19:07PM +0100, Gerald Schaefer wrote: > > > I'll check with Martin, maybe it is actually trivial, then we can > > > do a quick test it to rule that

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Wed, Feb 24, 2016 at 11:51:47AM +0100, Christian Borntraeger wrote: > On 02/24/2016 11:41 AM, Will Deacon wrote: > > On Wed, Feb 24, 2016 at 11:16:34AM +0100, Christian Borntraeger wrote: > >> Without that fix we would clearly have stale tlb entries, no? > > > > Yes, but AFAIU the sequence on

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Wed, Feb 24, 2016 at 11:51:47AM +0100, Christian Borntraeger wrote: > On 02/24/2016 11:41 AM, Will Deacon wrote: > > On Wed, Feb 24, 2016 at 11:16:34AM +0100, Christian Borntraeger wrote: > >> Without that fix we would clearly have stale tlb entries, no? > > > > Yes, but AFAIU the sequence on

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On 02/24/2016 11:41 AM, Will Deacon wrote: > On Wed, Feb 24, 2016 at 11:16:34AM +0100, Christian Borntraeger wrote: >> On 02/23/2016 09:22 PM, Will Deacon wrote: >>> On Tue, Feb 23, 2016 at 10:33:45PM +0300, Kirill A. Shutemov wrote: On Tue, Feb 23, 2016 at 07:19:07PM +0100, Gerald Schaefer

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On 02/24/2016 11:41 AM, Will Deacon wrote: > On Wed, Feb 24, 2016 at 11:16:34AM +0100, Christian Borntraeger wrote: >> On 02/23/2016 09:22 PM, Will Deacon wrote: >>> On Tue, Feb 23, 2016 at 10:33:45PM +0300, Kirill A. Shutemov wrote: On Tue, Feb 23, 2016 at 07:19:07PM +0100, Gerald Schaefer

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Wed, Feb 24, 2016 at 11:16:34AM +0100, Christian Borntraeger wrote: > On 02/23/2016 09:22 PM, Will Deacon wrote: > > On Tue, Feb 23, 2016 at 10:33:45PM +0300, Kirill A. Shutemov wrote: > >> On Tue, Feb 23, 2016 at 07:19:07PM +0100, Gerald Schaefer wrote: > >>> I'll check with Martin, maybe it

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Wed, Feb 24, 2016 at 11:16:34AM +0100, Christian Borntraeger wrote: > On 02/23/2016 09:22 PM, Will Deacon wrote: > > On Tue, Feb 23, 2016 at 10:33:45PM +0300, Kirill A. Shutemov wrote: > >> On Tue, Feb 23, 2016 at 07:19:07PM +0100, Gerald Schaefer wrote: > >>> I'll check with Martin, maybe it

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On 02/23/2016 09:22 PM, Will Deacon wrote: > On Tue, Feb 23, 2016 at 10:33:45PM +0300, Kirill A. Shutemov wrote: >> On Tue, Feb 23, 2016 at 07:19:07PM +0100, Gerald Schaefer wrote: >>> I'll check with Martin, maybe it is actually trivial, then we can >>> do a quick test it to rule that one out. >>

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On 02/23/2016 09:22 PM, Will Deacon wrote: > On Tue, Feb 23, 2016 at 10:33:45PM +0300, Kirill A. Shutemov wrote: >> On Tue, Feb 23, 2016 at 07:19:07PM +0100, Gerald Schaefer wrote: >>> I'll check with Martin, maybe it is actually trivial, then we can >>> do a quick test it to rule that one out. >>

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Tue, Feb 23, 2016 at 07:19:07PM +0100, Gerald Schaefer wrote: > I'll check with Martin, maybe it is actually trivial, then we can > do a quick test it to rule that one out. Oh. I found a bug in __split_huge_pmd_locked(). Although, not sure if it's _the_ bug. pmdp_invalidate() is called for

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Tue, Feb 23, 2016 at 07:19:07PM +0100, Gerald Schaefer wrote: > I'll check with Martin, maybe it is actually trivial, then we can > do a quick test it to rule that one out. Oh. I found a bug in __split_huge_pmd_locked(). Although, not sure if it's _the_ bug. pmdp_invalidate() is called for

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Tue, 23 Feb 2016 22:33:45 +0300 "Kirill A. Shutemov" wrote: > On Tue, Feb 23, 2016 at 07:19:07PM +0100, Gerald Schaefer wrote: > > I'll check with Martin, maybe it is actually trivial, then we can > > do a quick test it to rule that one out. > > Oh. I found a bug in

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Tue, 23 Feb 2016 22:33:45 +0300 "Kirill A. Shutemov" wrote: > On Tue, Feb 23, 2016 at 07:19:07PM +0100, Gerald Schaefer wrote: > > I'll check with Martin, maybe it is actually trivial, then we can > > do a quick test it to rule that one out. > > Oh. I found a bug in

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Tue, 23 Feb 2016 19:19:07 +0100 Gerald Schaefer wrote: > On Tue, 23 Feb 2016 13:32:21 +0300 > "Kirill A. Shutemov" wrote: > > > On Fri, Feb 12, 2016 at 06:16:40PM +0100, Gerald Schaefer wrote: > > > On Fri, 12 Feb 2016 16:57:27 +0100 > > >

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Tue, 23 Feb 2016 19:19:07 +0100 Gerald Schaefer wrote: > On Tue, 23 Feb 2016 13:32:21 +0300 > "Kirill A. Shutemov" wrote: > > > On Fri, Feb 12, 2016 at 06:16:40PM +0100, Gerald Schaefer wrote: > > > On Fri, 12 Feb 2016 16:57:27 +0100 > > > Christian Borntraeger wrote: > > > > > > > > I'm

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Tue, Feb 23, 2016 at 10:33:45PM +0300, Kirill A. Shutemov wrote: > On Tue, Feb 23, 2016 at 07:19:07PM +0100, Gerald Schaefer wrote: > > I'll check with Martin, maybe it is actually trivial, then we can > > do a quick test it to rule that one out. > > Oh. I found a bug in

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Tue, Feb 23, 2016 at 10:33:45PM +0300, Kirill A. Shutemov wrote: > On Tue, Feb 23, 2016 at 07:19:07PM +0100, Gerald Schaefer wrote: > > I'll check with Martin, maybe it is actually trivial, then we can > > do a quick test it to rule that one out. > > Oh. I found a bug in

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

[adding Steve, since he worked on THP for 32-bit ARM] On Tue, Feb 23, 2016 at 07:19:07PM +0100, Gerald Schaefer wrote: > On Tue, 23 Feb 2016 13:32:21 +0300 > "Kirill A. Shutemov" wrote: > > The theory is that the splitting bit effetely masked bogus pmd_present(): > > we had

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

[adding Steve, since he worked on THP for 32-bit ARM] On Tue, Feb 23, 2016 at 07:19:07PM +0100, Gerald Schaefer wrote: > On Tue, 23 Feb 2016 13:32:21 +0300 > "Kirill A. Shutemov" wrote: > > The theory is that the splitting bit effetely masked bogus pmd_present(): > > we had pmd_trans_splitting()

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Tue, 23 Feb 2016 13:32:21 +0300 "Kirill A. Shutemov" wrote: > On Fri, Feb 12, 2016 at 06:16:40PM +0100, Gerald Schaefer wrote: > > On Fri, 12 Feb 2016 16:57:27 +0100 > > Christian Borntraeger wrote: > > > > > > I'm also confused by pmd_none() is

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Tue, 23 Feb 2016 13:32:21 +0300 "Kirill A. Shutemov" wrote: > On Fri, Feb 12, 2016 at 06:16:40PM +0100, Gerald Schaefer wrote: > > On Fri, 12 Feb 2016 16:57:27 +0100 > > Christian Borntraeger wrote: > > > > > > I'm also confused by pmd_none() is equal to !pmd_present() on s390. Hm? > > > >

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Tue, Feb 23, 2016 at 2:32 AM, Kirill A. Shutemov wrote: > > I still worry about pmd_present(). It looks wrong to me. I wounder if > patch below makes a difference. Let's hope that's it, but in the meantime I do want to start the discussion about what to do if it isn't.

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Tue, Feb 23, 2016 at 2:32 AM, Kirill A. Shutemov wrote: > > I still worry about pmd_present(). It looks wrong to me. I wounder if > patch below makes a difference. Let's hope that's it, but in the meantime I do want to start the discussion about what to do if it isn't. We're at rc5, and 4.5

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Fri, Feb 12, 2016 at 06:16:40PM +0100, Gerald Schaefer wrote: > On Fri, 12 Feb 2016 16:57:27 +0100 > Christian Borntraeger wrote: > > > > I'm also confused by pmd_none() is equal to !pmd_present() on s390. Hm? > > > > Don't know, Gerald or Martin? > > The

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Fri, Feb 12, 2016 at 06:16:40PM +0100, Gerald Schaefer wrote: > On Fri, 12 Feb 2016 16:57:27 +0100 > Christian Borntraeger wrote: > > > > I'm also confused by pmd_none() is equal to !pmd_present() on s390. Hm? > > > > Don't know, Gerald or Martin? > > The implementation frequently changes

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Thu, 18 Feb 2016, Kirill A. Shutemov wrote: > I worth minimizing kernel config on which you can see the bug. Things like > CONFIG_DEBUG_PAGEALLOC used to interfere with THP before. I disabled all debugging options (using arch/s390/configs/performance_defconfig) - we still chrashed. Sebastian

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Thu, 18 Feb 2016, Kirill A. Shutemov wrote: > I worth minimizing kernel config on which you can see the bug. Things like > CONFIG_DEBUG_PAGEALLOC used to interfere with THP before. I disabled all debugging options (using arch/s390/configs/performance_defconfig) - we still chrashed. Sebastian

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Thu, Feb 18, 2016 at 04:00:37PM +0100, Gerald Schaefer wrote: > On Thu, 18 Feb 2016 01:58:08 +0200 > "Kirill A. Shutemov" wrote: > > > On Wed, Feb 17, 2016 at 08:13:40PM +0100, Gerald Schaefer wrote: > > > On Sat, 13 Feb 2016 12:58:31 +0100 (CET) > > > Sebastian Ott

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Thu, Feb 18, 2016 at 04:00:37PM +0100, Gerald Schaefer wrote: > On Thu, 18 Feb 2016 01:58:08 +0200 > "Kirill A. Shutemov" wrote: > > > On Wed, Feb 17, 2016 at 08:13:40PM +0100, Gerald Schaefer wrote: > > > On Sat, 13 Feb 2016 12:58:31 +0100 (CET) > > > Sebastian Ott wrote: > > > > > > > [

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Thu, 18 Feb 2016 01:58:08 +0200 "Kirill A. Shutemov" wrote: > On Wed, Feb 17, 2016 at 08:13:40PM +0100, Gerald Schaefer wrote: > > On Sat, 13 Feb 2016 12:58:31 +0100 (CET) > > Sebastian Ott wrote: > > > > > [ 59.875935] [ cut

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Thu, 18 Feb 2016 01:58:08 +0200 "Kirill A. Shutemov" wrote: > On Wed, Feb 17, 2016 at 08:13:40PM +0100, Gerald Schaefer wrote: > > On Sat, 13 Feb 2016 12:58:31 +0100 (CET) > > Sebastian Ott wrote: > > > > > [ 59.875935] [ cut here ] > > > [ 59.875937] kernel BUG

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Wed, Feb 17, 2016 at 08:13:40PM +0100, Gerald Schaefer wrote: > On Sat, 13 Feb 2016 12:58:31 +0100 (CET) > Sebastian Ott wrote: > > > [ 59.875935] [ cut here ] > > [ 59.875937] kernel BUG at mm/huge_memory.c:2884! > > [ 59.875979]

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Wed, Feb 17, 2016 at 08:13:40PM +0100, Gerald Schaefer wrote: > On Sat, 13 Feb 2016 12:58:31 +0100 (CET) > Sebastian Ott wrote: > > > [ 59.875935] [ cut here ] > > [ 59.875937] kernel BUG at mm/huge_memory.c:2884! > > [ 59.875979] illegal operation: 0001 ilc:1

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Sat, 13 Feb 2016 12:58:31 +0100 (CET) Sebastian Ott wrote: > [ 59.875935] [ cut here ] > [ 59.875937] kernel BUG at mm/huge_memory.c:2884! > [ 59.875979] illegal operation: 0001 ilc:1 [#1] PREEMPT SMP DEBUG_PAGEALLOC > [ 59.875986]

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Sat, 13 Feb 2016 12:58:31 +0100 (CET) Sebastian Ott wrote: > [ 59.875935] [ cut here ] > [ 59.875937] kernel BUG at mm/huge_memory.c:2884! > [ 59.875979] illegal operation: 0001 ilc:1 [#1] PREEMPT SMP DEBUG_PAGEALLOC > [ 59.875986] Modules linked in: bridge stp

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

Hi, On Wed, 17 Feb 2016, Kirill A. Shutemov wrote: > On Tue, Feb 16, 2016 at 05:24:44PM +0100, Gerald Schaefer wrote: > > On Mon, 15 Feb 2016 23:35:26 +0200 > > "Kirill A. Shutemov" wrote: > > > > > Is there any chance that I'll be able to trigger the bug using QEMU? > > >

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

Hi, On Wed, 17 Feb 2016, Kirill A. Shutemov wrote: > On Tue, Feb 16, 2016 at 05:24:44PM +0100, Gerald Schaefer wrote: > > On Mon, 15 Feb 2016 23:35:26 +0200 > > "Kirill A. Shutemov" wrote: > > > > > Is there any chance that I'll be able to trigger the bug using QEMU? > > > Does anybody have an

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Tue, Feb 16, 2016 at 05:24:44PM +0100, Gerald Schaefer wrote: > On Mon, 15 Feb 2016 23:35:26 +0200 > "Kirill A. Shutemov" wrote: > > > Is there any chance that I'll be able to trigger the bug using QEMU? > > Does anybody have an QEMU image I can use? > > > > I have no

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Tue, Feb 16, 2016 at 05:24:44PM +0100, Gerald Schaefer wrote: > On Mon, 15 Feb 2016 23:35:26 +0200 > "Kirill A. Shutemov" wrote: > > > Is there any chance that I'll be able to trigger the bug using QEMU? > > Does anybody have an QEMU image I can use? > > > > I have no image, but trying to

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On 02/15/2016 10:35 PM, Kirill A. Shutemov wrote: > > Is there any chance that I'll be able to trigger the bug using QEMU? > Does anybody have an QEMU image I can use? qemu/TCG on s390 does neither provide SMP nor large pages (only QEMU/KVM does) so this will probably not help you here.

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On 02/15/2016 10:35 PM, Kirill A. Shutemov wrote: > > Is there any chance that I'll be able to trigger the bug using QEMU? > Does anybody have an QEMU image I can use? qemu/TCG on s390 does neither provide SMP nor large pages (only QEMU/KVM does) so this will probably not help you here.

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Mon, 15 Feb 2016 23:35:26 +0200 "Kirill A. Shutemov" wrote: > On Mon, Feb 15, 2016 at 07:37:02PM +0100, Gerald Schaefer wrote: > > On Mon, 15 Feb 2016 13:31:59 +0200 > > "Kirill A. Shutemov" wrote: > > > > > On Sat, Feb 13, 2016 at 12:58:31PM

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Mon, 15 Feb 2016 23:35:26 +0200 "Kirill A. Shutemov" wrote: > On Mon, Feb 15, 2016 at 07:37:02PM +0100, Gerald Schaefer wrote: > > On Mon, 15 Feb 2016 13:31:59 +0200 > > "Kirill A. Shutemov" wrote: > > > > > On Sat, Feb 13, 2016 at 12:58:31PM +0100, Sebastian Ott wrote: > > > > > > > > On

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Mon, 15 Feb 2016, Kirill A. Shutemov wrote: > Just to make sure: commit 122afea9626a is fine, commit 61f5d698cc97 > crashes. Correct? Correct.

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Mon, 15 Feb 2016, Kirill A. Shutemov wrote: > Just to make sure: commit 122afea9626a is fine, commit 61f5d698cc97 > crashes. Correct? Correct.

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Mon, Feb 15, 2016 at 07:37:02PM +0100, Gerald Schaefer wrote: > On Mon, 15 Feb 2016 13:31:59 +0200 > "Kirill A. Shutemov" wrote: > > > On Sat, Feb 13, 2016 at 12:58:31PM +0100, Sebastian Ott wrote: > > > > > > On Sat, 13 Feb 2016, Kirill A. Shutemov wrote: > > > > Could

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Mon, Feb 15, 2016 at 07:37:02PM +0100, Gerald Schaefer wrote: > On Mon, 15 Feb 2016 13:31:59 +0200 > "Kirill A. Shutemov" wrote: > > > On Sat, Feb 13, 2016 at 12:58:31PM +0100, Sebastian Ott wrote: > > > > > > On Sat, 13 Feb 2016, Kirill A. Shutemov wrote: > > > > Could you check if revert

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Mon, 15 Feb 2016 13:31:59 +0200 "Kirill A. Shutemov" wrote: > On Sat, Feb 13, 2016 at 12:58:31PM +0100, Sebastian Ott wrote: > > > > On Sat, 13 Feb 2016, Kirill A. Shutemov wrote: > > > Could you check if revert of fecffad25458 helps? > > > > I reverted fecffad25458 on

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Mon, 15 Feb 2016 13:31:59 +0200 "Kirill A. Shutemov" wrote: > On Sat, Feb 13, 2016 at 12:58:31PM +0100, Sebastian Ott wrote: > > > > On Sat, 13 Feb 2016, Kirill A. Shutemov wrote: > > > Could you check if revert of fecffad25458 helps? > > > > I reverted fecffad25458 on top of 721675fcf277cf

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Sat, 13 Feb 2016 01:15:10 +0200 "Kirill A. Shutemov" wrote: > > I'm trying to wrap my head around the issue and I don't think missing > serialization with gup_fast is the cause -- we just don't need it > anymore. > > Previously, __split_huge_page_splitting() required

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Sat, 13 Feb 2016 01:15:10 +0200 "Kirill A. Shutemov" wrote: > > I'm trying to wrap my head around the issue and I don't think missing > serialization with gup_fast is the cause -- we just don't need it > anymore. > > Previously, __split_huge_page_splitting() required serialization against >

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Mon, 15 Feb 2016, Kirill A. Shutemov wrote: > > [ 59.851421] list_del corruption. next->prev should be 6e1eb000, > > but was 0400 > > This kinda interesting: 0x400 is TAIL_MAPPING.. Hm.. > > Could you check if you see the problem on commit 1c290f642101 and its >

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Mon, 15 Feb 2016, Kirill A. Shutemov wrote: > > [ 59.851421] list_del corruption. next->prev should be 6e1eb000, > > but was 0400 > > This kinda interesting: 0x400 is TAIL_MAPPING.. Hm.. > > Could you check if you see the problem on commit 1c290f642101 and its >

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Sat, Feb 13, 2016 at 12:58:31PM +0100, Sebastian Ott wrote: > > On Sat, 13 Feb 2016, Kirill A. Shutemov wrote: > > Could you check if revert of fecffad25458 helps? > > I reverted fecffad25458 on top of 721675fcf277cf - it oopsed with: > > ¢ 1851.721062! Unable to handle kernel pointer

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Sat, Feb 13, 2016 at 12:58:31PM +0100, Sebastian Ott wrote: > > On Sat, 13 Feb 2016, Kirill A. Shutemov wrote: > > Could you check if revert of fecffad25458 helps? > > I reverted fecffad25458 on top of 721675fcf277cf - it oopsed with: > > ¢ 1851.721062! Unable to handle kernel pointer

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Sat, 13 Feb 2016, Kirill A. Shutemov wrote: > Could you check if revert of fecffad25458 helps? I reverted fecffad25458 on top of 721675fcf277cf - it oopsed with: ¢ 1851.721062! Unable to handle kernel pointer dereference in virtual kernel address space ¢ 1851.721075! failing address:

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Sat, 13 Feb 2016, Kirill A. Shutemov wrote: > Could you check if revert of fecffad25458 helps? I reverted fecffad25458 on top of 721675fcf277cf - it oopsed with: ¢ 1851.721062! Unable to handle kernel pointer dereference in virtual kernel address space ¢ 1851.721075! failing address:

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Fri, Feb 12, 2016 at 06:16:40PM +0100, Gerald Schaefer wrote: > On Fri, 12 Feb 2016 16:57:27 +0100 > Christian Borntraeger wrote: > > > On 02/12/2016 04:41 PM, Kirill A. Shutemov wrote: > > > On Thu, Feb 11, 2016 at 08:57:02PM +0100, Gerald Schaefer wrote: > > >> On Thu, 11 Feb 2016 21:09:42

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Fri, 12 Feb 2016 16:57:27 +0100 Christian Borntraeger wrote: > On 02/12/2016 04:41 PM, Kirill A. Shutemov wrote: > > On Thu, Feb 11, 2016 at 08:57:02PM +0100, Gerald Schaefer wrote: > >> On Thu, 11 Feb 2016 21:09:42 +0200 > >> "Kirill A. Shutemov" wrote: > >> > >>> On Thu, Feb 11, 2016 at

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

Gerald Schaefer writes: > On Fri, 12 Feb 2016 09:34:33 +0530 > "Aneesh Kumar K.V" wrote: > >> Gerald Schaefer writes: >> >> > On Thu, 11 Feb 2016 21:09:42 +0200 >> > "Kirill A. Shutemov" wrote: >> > >> >> On Thu, Feb 11, 2016 at 07:22:23PM +0100, Gerald Schaefer wrote: >> >> > Hi, >> >> >

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On 02/12/2016 04:41 PM, Kirill A. Shutemov wrote: > On Thu, Feb 11, 2016 at 08:57:02PM +0100, Gerald Schaefer wrote: >> On Thu, 11 Feb 2016 21:09:42 +0200 >> "Kirill A. Shutemov" wrote: >> >>> On Thu, Feb 11, 2016 at 07:22:23PM +0100, Gerald Schaefer wrote: Hi, Sebastian Ott

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Fri, Feb 12, 2016 at 11:12:34AM +0100, Sebastian Ott wrote: > On Fri, 12 Feb 2016, Will Deacon wrote: > > On Thu, Feb 11, 2016 at 08:57:02PM +0100, Gerald Schaefer wrote: > > > On Thu, 11 Feb 2016 21:09:42 +0200 > > > "Kirill A. Shutemov" wrote: > > > > On Thu, Feb 11, 2016 at 07:22:23PM

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Thu, Feb 11, 2016 at 08:57:02PM +0100, Gerald Schaefer wrote: > On Thu, 11 Feb 2016 21:09:42 +0200 > "Kirill A. Shutemov" wrote: > > > On Thu, Feb 11, 2016 at 07:22:23PM +0100, Gerald Schaefer wrote: > > > Hi, > > > > > > Sebastian Ott reported random kernel crashes beginning with v4.5-rc1

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Thu, 11 Feb 2016, Kirill A. Shutemov wrote: > On Thu, Feb 11, 2016 at 09:09:42PM +0200, Kirill A. Shutemov wrote: > > On Thu, Feb 11, 2016 at 07:22:23PM +0100, Gerald Schaefer wrote: > > > Hi, > > > > > > Sebastian Ott reported random kernel crashes beginning with v4.5-rc1 and > > > he also

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Fri, 12 Feb 2016 09:34:33 +0530 "Aneesh Kumar K.V" wrote: > Gerald Schaefer writes: > > > On Thu, 11 Feb 2016 21:09:42 +0200 > > "Kirill A. Shutemov" wrote: > > > >> On Thu, Feb 11, 2016 at 07:22:23PM +0100, Gerald Schaefer wrote: > >> > Hi, > >> > > >> > Sebastian Ott reported random

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Fri, 12 Feb 2016, Will Deacon wrote: > On Thu, Feb 11, 2016 at 08:57:02PM +0100, Gerald Schaefer wrote: > > On Thu, 11 Feb 2016 21:09:42 +0200 > > "Kirill A. Shutemov" wrote: > > > On Thu, Feb 11, 2016 at 07:22:23PM +0100, Gerald Schaefer wrote: > > > > Sebastian Ott reported random kernel

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Thu, Feb 11, 2016 at 08:57:02PM +0100, Gerald Schaefer wrote: > On Thu, 11 Feb 2016 21:09:42 +0200 > "Kirill A. Shutemov" wrote: > > On Thu, Feb 11, 2016 at 07:22:23PM +0100, Gerald Schaefer wrote: > > > Sebastian Ott reported random kernel crashes beginning with v4.5-rc1 and > > > he also

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Thu, Feb 11, 2016 at 08:57:02PM +0100, Gerald Schaefer wrote: > On Thu, 11 Feb 2016 21:09:42 +0200 > "Kirill A. Shutemov" wrote: > > On Thu, Feb 11, 2016 at 07:22:23PM +0100, Gerald Schaefer wrote: > > > Sebastian Ott reported random kernel crashes beginning with v4.5-rc1

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Fri, 12 Feb 2016, Will Deacon wrote: > On Thu, Feb 11, 2016 at 08:57:02PM +0100, Gerald Schaefer wrote: > > On Thu, 11 Feb 2016 21:09:42 +0200 > > "Kirill A. Shutemov" wrote: > > > On Thu, Feb 11, 2016 at 07:22:23PM +0100, Gerald Schaefer wrote: > > > > Sebastian Ott

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Fri, 12 Feb 2016 09:34:33 +0530 "Aneesh Kumar K.V" wrote: > Gerald Schaefer writes: > > > On Thu, 11 Feb 2016 21:09:42 +0200 > > "Kirill A. Shutemov" wrote: > > > >> On Thu, Feb 11, 2016 at 07:22:23PM +0100,

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Thu, 11 Feb 2016, Kirill A. Shutemov wrote: > On Thu, Feb 11, 2016 at 09:09:42PM +0200, Kirill A. Shutemov wrote: > > On Thu, Feb 11, 2016 at 07:22:23PM +0100, Gerald Schaefer wrote: > > > Hi, > > > > > > Sebastian Ott reported random kernel crashes beginning with v4.5-rc1 and > > > he also

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Fri, 12 Feb 2016 16:57:27 +0100 Christian Borntraeger wrote: > On 02/12/2016 04:41 PM, Kirill A. Shutemov wrote: > > On Thu, Feb 11, 2016 at 08:57:02PM +0100, Gerald Schaefer wrote: > >> On Thu, 11 Feb 2016 21:09:42 +0200 > >> "Kirill A. Shutemov"

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

Gerald Schaefer writes: > On Fri, 12 Feb 2016 09:34:33 +0530 > "Aneesh Kumar K.V" wrote: > >> Gerald Schaefer writes: >> >> > On Thu, 11 Feb 2016 21:09:42 +0200 >> > "Kirill A. Shutemov"

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Thu, Feb 11, 2016 at 08:57:02PM +0100, Gerald Schaefer wrote: > On Thu, 11 Feb 2016 21:09:42 +0200 > "Kirill A. Shutemov" wrote: > > > On Thu, Feb 11, 2016 at 07:22:23PM +0100, Gerald Schaefer wrote: > > > Hi, > > > > > > Sebastian Ott reported random kernel crashes

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Fri, Feb 12, 2016 at 11:12:34AM +0100, Sebastian Ott wrote: > On Fri, 12 Feb 2016, Will Deacon wrote: > > On Thu, Feb 11, 2016 at 08:57:02PM +0100, Gerald Schaefer wrote: > > > On Thu, 11 Feb 2016 21:09:42 +0200 > > > "Kirill A. Shutemov" wrote: > > > > On Thu, Feb 11,

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On 02/12/2016 04:41 PM, Kirill A. Shutemov wrote: > On Thu, Feb 11, 2016 at 08:57:02PM +0100, Gerald Schaefer wrote: >> On Thu, 11 Feb 2016 21:09:42 +0200 >> "Kirill A. Shutemov" wrote: >> >>> On Thu, Feb 11, 2016 at 07:22:23PM +0100, Gerald Schaefer wrote: Hi,

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Fri, Feb 12, 2016 at 06:16:40PM +0100, Gerald Schaefer wrote: > On Fri, 12 Feb 2016 16:57:27 +0100 > Christian Borntraeger wrote: > > > On 02/12/2016 04:41 PM, Kirill A. Shutemov wrote: > > > On Thu, Feb 11, 2016 at 08:57:02PM +0100, Gerald Schaefer wrote: > > >> On

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

Gerald Schaefer writes: > On Thu, 11 Feb 2016 21:09:42 +0200 > "Kirill A. Shutemov" wrote: > >> On Thu, Feb 11, 2016 at 07:22:23PM +0100, Gerald Schaefer wrote: >> > Hi, >> > >> > Sebastian Ott reported random kernel crashes beginning with v4.5-rc1 and >> > he also bisected this to commit

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Thu, 11 Feb 2016 21:09:42 +0200 "Kirill A. Shutemov" wrote: > On Thu, Feb 11, 2016 at 07:22:23PM +0100, Gerald Schaefer wrote: > > Hi, > > > > Sebastian Ott reported random kernel crashes beginning with v4.5-rc1 and > > he also bisected this to commit 61f5d698 "mm: re-enable THP". Further >

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Thu, Feb 11, 2016 at 09:09:42PM +0200, Kirill A. Shutemov wrote: > On Thu, Feb 11, 2016 at 07:22:23PM +0100, Gerald Schaefer wrote: > > Hi, > > > > Sebastian Ott reported random kernel crashes beginning with v4.5-rc1 and > > he also bisected this to commit 61f5d698 "mm: re-enable THP". Further

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Thu, Feb 11, 2016 at 07:22:23PM +0100, Gerald Schaefer wrote: > Hi, > > Sebastian Ott reported random kernel crashes beginning with v4.5-rc1 and > he also bisected this to commit 61f5d698 "mm: re-enable THP". Further > review of the THP rework patches, which cannot be bisected, revealed >

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Thu, Feb 11, 2016 at 09:09:42PM +0200, Kirill A. Shutemov wrote: > On Thu, Feb 11, 2016 at 07:22:23PM +0100, Gerald Schaefer wrote: > > Hi, > > > > Sebastian Ott reported random kernel crashes beginning with v4.5-rc1 and > > he also bisected this to commit 61f5d698 "mm: re-enable THP". Further

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Thu, Feb 11, 2016 at 07:22:23PM +0100, Gerald Schaefer wrote: > Hi, > > Sebastian Ott reported random kernel crashes beginning with v4.5-rc1 and > he also bisected this to commit 61f5d698 "mm: re-enable THP". Further > review of the THP rework patches, which cannot be bisected, revealed >

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

On Thu, 11 Feb 2016 21:09:42 +0200 "Kirill A. Shutemov" wrote: > On Thu, Feb 11, 2016 at 07:22:23PM +0100, Gerald Schaefer wrote: > > Hi, > > > > Sebastian Ott reported random kernel crashes beginning with v4.5-rc1 and > > he also bisected this to commit 61f5d698 "mm:

Re: [BUG] random kernel crashes after THP rework on s390 (maybe also on PowerPC and ARM)

Gerald Schaefer writes: > On Thu, 11 Feb 2016 21:09:42 +0200 > "Kirill A. Shutemov" wrote: > >> On Thu, Feb 11, 2016 at 07:22:23PM +0100, Gerald Schaefer wrote: >> > Hi, >> > >> > Sebastian Ott reported random kernel crashes beginning with