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)

:31 +0100 (CET) > > > Sebastian Ott <seb...@linux.vnet.ibm.com> wrote: > > > > > > > [ 59.875935] [ cut here ] > > > > [ 59.875937] kernel BUG at mm/huge_memory.c:2884! > > > > [ 59.875979] illegal o

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

0 (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

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

gt; > > > [ 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: brid

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 ]----

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 <seb...@linux.vnet.ibm.com> wrote: > > > [ 59.875935] [ cut here ]---- > > [ 59.875937] kernel BUG at mm/huge_memor

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] il

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 <seb...@linux.vnet.ibm.com> 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

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

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

904111! ¢<002d44a4>! vfs_fstatat+0x6c/0xc8 ¢ 1707.904113! ¢<002d4894>! SyS_newlstat+0x2c/0x48 ¢ 1707.904115! ¢<006f9cce>! system_call+0xd6/0x258 ¢ 1707.904117! ¢<03ffb45f1124>! 0x3ffb45f1124 ¢ 1707.904118! 1 lock held by git/25215: ¢ 1707.904119! #0: (

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

vfs_fstatat+0x6c/0xc8 ¢ 1707.904113! ¢<002d4894>! SyS_newlstat+0x2c/0x48 ¢ 1707.904115! ¢<006f9cce>! system_call+0xd6/0x258 ¢ 1707.904117! ¢<03ffb45f1124>! 0x3ffb45f1124 ¢ 1707.904118! 1 lock held by git/25215: ¢ 1707.904119! #0: (_hash¢i!.lock){-.-

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)

inside the pre-allocated pagetables instead of > > page->lru, > > because we have 2K pagetables on s390 and cannot use struct page == > > pgtable_t. > > 0x400 from empty pte makes more sense than TAIL_MAPPING. But I guess it > worth changing TAIL_MAPPING to some other va

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

> > page->lru, > > because we have 2K pagetables on s390 and cannot use struct page == > > pgtable_t. > > 0x400 from empty pte makes more sense than TAIL_MAPPING. But I guess it > worth changing TAIL_MAPPING to some other value to make sure. Right, but we cannot trigger this li

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)

] [<03ff9bbfd282>] 0x3ff9bbfd282 [ 59.875904] 2 locks held by git/5402: [ 59.875906] #0: (>mmap_sem){++}, at: [<0029bb5a>] SyS_madvise+0x562/0x5e8 [ 59.875914] #1: (&(ptlock_ptr(page))->rlock){+.+...}, at: [<0000002c4268>] __split_huge_pmd+0x70/0x

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

] [<03ff9bbfd282>] 0x3ff9bbfd282 [ 59.875904] 2 locks held by git/5402: [ 59.875906] #0: (>mmap_sem){++}, at: [<0029bb5a>] SyS_madvise+0x562/0x5e8 [ 59.875914] #1: (&(ptlock_ptr(page))->rlock){+.+...}, at: [<0000002c4268>] __split_huge_pmd+0x70/0x

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 >

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

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 commit fecffad "s390, thp: remove infrastructure for handling splitting PMDs"

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

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

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 commit fecffad "s390, thp: remove infrastructure for handling splitting PMDs"

Re: [Nbd] NBD: Disconnect connection/kill NBD server cause kernel bug even kernel hang

On Mon 2015-09-21 17:33:21, Sheng Yang wrote: > Thank you Paul! That's exactly the issue I met. I've read the whole > thread and got a general idea of the issue. > > I try to summarize it and please correct me if I'm wrong: > > 1. The issue is the result of kill_bdev() when connection has been

Re: [Nbd] NBD: Disconnect connection/kill NBD server cause kernel bug even kernel hang

On Mon 2015-09-21 17:33:21, Sheng Yang wrote: > Thank you Paul! That's exactly the issue I met. I've read the whole > thread and got a general idea of the issue. > > I try to summarize it and please correct me if I'm wrong: > > 1. The issue is the result of kill_bdev() when connection has been

Re: [Nbd] NBD: Disconnect connection/kill NBD server cause kernel bug even kernel hang

nbd-general/thread/20131114075827.GA13554%40quack.suse.cz/#msg31636917 > > > > Maybe Markus has some thoughts on how to fix it. I think there are a couple > > options. > > > > -- > > Paul > > > > On Wed, Sep 16, 2015 at 9:18 PM, Sheng Yang wrote

Re: [Nbd] NBD: Disconnect connection/kill NBD server cause kernel bug even kernel hang

//sourceforge.net/p/nbd/mailman/nbd-general/thread/20131114075827.GA13554%40quack.suse.cz/#msg31636917 > > > > Maybe Markus has some thoughts on how to fix it. I think there are a couple > > options. > > > > -- > > Paul > > > > On Wed, Sep 16, 2015 at

Re: [Nbd] NBD: Disconnect connection/kill NBD server cause kernel bug even kernel hang

/mailman/nbd-general/thread/20131114075827.GA13554%40quack.suse.cz/#msg31636917 > > Maybe Markus has some thoughts on how to fix it. I think there are a couple > options. > > -- > Paul > > On Wed, Sep 16, 2015 at 9:18 PM, Sheng Yang wrote: >> >> Hi, Markus, &g

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