similar to: weird slowdowns with recent CentOS 6 update

Hello Minchan, -next 4.7.0-rc3-next-20160614 [ 315.146533] kasan: CONFIG_KASAN_INLINE enabled [ 315.146538] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 315.146546] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 315.146576] Modules linked in: lzo zram zsmalloc mousedev coretemp hwmon crc32c_intel r8169 i2c_i801 mii snd_hda_codec_realtek snd_hda_codec_generic

I have a CentOS 6 system that has suddenly starting significantly slowing down. It runs a django app with an Apache server and MySQL server. There is plenty of disk space and no process seems to be hogging the memory or CPU. But operations that used to take 5 minutes are now taking hours and hours. Coinciding with this slow down I see these messages in /var/log/messages (this is hand typed, as I

Hello! I have a program in Fortran and would like to build a matrix with random numbers, I have a function in C. However, I have problems with the use of function in R. Code to compile: R CMD SHLIB mat.f myrbeta.c -o func.so Code in C. #include <R.h> #include <Rmath.h> void F77_SUB(fseedi)(void){   GetRNGstate(); } void F77_SUB(fseedo)(void){   PutRNGstate(); } void

On (06/16/16 13:47), Minchan Kim wrote: [..] > > this is what I'm getting with the [zsmalloc: keep first object offset in struct page] > > applied: "count:0 mapcount:-127". which may be not related to zsmalloc at this point. > > > > kernel: BUG: Bad page state in process khugepaged pfn:101db8 > > kernel: page:ffffea0004076e00 count:0 mapcount:-127

On Thu, Jun 16, 2016 at 02:22:09PM +0900, Sergey Senozhatsky wrote: > On (06/16/16 13:47), Minchan Kim wrote: > [..] > > > this is what I'm getting with the [zsmalloc: keep first object offset in struct page] > > > applied: "count:0 mapcount:-127". which may be not related to zsmalloc at this point. > > > > > > kernel: BUG: Bad page state

On Thu, Jun 16, 2016 at 02:22:09PM +0900, Sergey Senozhatsky wrote: > On (06/16/16 13:47), Minchan Kim wrote: > [..] > > > this is what I'm getting with the [zsmalloc: keep first object offset in struct page] > > > applied: "count:0 mapcount:-127". which may be not related to zsmalloc at this point. > > > > > > kernel: BUG: Bad page state

On (06/16/16 11:58), Minchan Kim wrote: [..] > RAX: 2065676162726166 so rax is totally garbage, I think. > It means obj_to_head returns garbage because get_first_obj_offset is > utter crab because (page_idx / class->pages_per_zspage) was totally > wrong. > > > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > > 6408: f0 0f ba 28 00 lock btsl $0x0,(%rax)

Dear all, Yesterday, from the customer's code I observed relatively simple case, where Polly is unable to detect parallelizable outer loop. Consider two versions of Fortran routine: 1) subroutine filter(H, szh, X, szx, Y, szy) implicit none integer(kind=IKIND), intent(in) :: szh, szx, szy real(kind=RKIND), intent(in) :: H(szh), X(szx) real(kind=RKIND), intent(out) :: Y(szy)

On Thu, Jun 16, 2016 at 01:23:43PM +0900, Sergey Senozhatsky wrote: > On (06/16/16 11:58), Minchan Kim wrote: > [..] > > RAX: 2065676162726166 so rax is totally garbage, I think. > > It means obj_to_head returns garbage because get_first_obj_offset is > > utter crab because (page_idx / class->pages_per_zspage) was totally > > wrong. > > > > >

On Thu, Jun 16, 2016 at 01:23:43PM +0900, Sergey Senozhatsky wrote: > On (06/16/16 11:58), Minchan Kim wrote: > [..] > > RAX: 2065676162726166 so rax is totally garbage, I think. > > It means obj_to_head returns garbage because get_first_obj_offset is > > utter crab because (page_idx / class->pages_per_zspage) was totally > > wrong. > > > > >

Hi, I'm using R 7.0 under Linux as a programming interface to Fortran (g77 v0.5.24). Basically, what I want to do is to call a fortran subroutine of mine which performs MCMC computations. Apparently I'm getting into memory management problems. To track the problem I wrote the following small Fortran subroutine (saved as test.f) : subroutine test(n,p) implicit none

> > kernel: BUG: soft lockup - CPU#5 stuck for 67s! [khungtaskd] > kernel: BUG: soft lockup - CPU#7 stuck for 67s! [khugepaged] > > These messages started appearing today around 7 AM, which is when > users started reporting the slowdown. They are still occurring > periodically and the system is still slow. Are these messages caused > by the slowdown or are they the reason

Hi Sergey, On Wed, Jun 15, 2016 at 04:59:09PM +0900, Sergey Senozhatsky wrote: > Hello Minchan, > > -next 4.7.0-rc3-next-20160614 > > > [ 315.146533] kasan: CONFIG_KASAN_INLINE enabled > [ 315.146538] kasan: GPF could be caused by NULL-ptr deref or user memory access > [ 315.146546] general protection fault: 0000 [#1] PREEMPT SMP KASAN > [ 315.146576] Modules

Hi Sergey, On Wed, Jun 15, 2016 at 04:59:09PM +0900, Sergey Senozhatsky wrote: > Hello Minchan, > > -next 4.7.0-rc3-next-20160614 > > > [ 315.146533] kasan: CONFIG_KASAN_INLINE enabled > [ 315.146538] kasan: GPF could be caused by NULL-ptr deref or user memory access > [ 315.146546] general protection fault: 0000 [#1] PREEMPT SMP KASAN > [ 315.146576] Modules

On Tue, Sep 10, 2019 at 07:49:51AM +0000, Mircea CIRJALIU - MELIU wrote: > > On 05/09/19 20:09, Jerome Glisse wrote: > > > Not sure i understand, you are saying that the solution i outline > > > above does not work ? If so then i think you are wrong, in the above > > > solution the importing process mmap a device file and the resulting > > > vma is then

According to comment in tree-nested.c, these frames should be only introduced in case of debug or OpenMP lowering: /* A subroutine of convert_nonlocal_reference_op. Create a local variable in the nested function with DECL_VALUE_EXPR set to reference the true variable in the parent function. This is used both for debug info and in OpenMP lowering. */ However, in this code example we

Oops, sorry for the message title, making it more descriptive now... 2013/2/3 Dmitry Mikushin <dmitry at kernelgen.org> > Dear all, > > Yesterday, from the customer's code I observed relatively simple case, > where Polly is unable to detect parallelizable outer loop. Consider two > versions of Fortran routine: > > 1) > > subroutine filter(H, szh, X, szx, Y,

Hello, I'm finding problems with BackEdgeTaken count calculation in even simple fortran loops with gfortran-4.6 + DragonEgg 3.0. Even for simple double loops like this one: program test2 integer i,j,k dimension k(100,100) do j=1,100 do i=1,100 k(i,j) = i enddo enddo write(*,*) k(1,30) end make the ScalarEvolution

Mmm, sorry, the patch I posted crashes if ExitBr is null (which it may be ...) , this one should be ok (and passess all the ScalarEvolution tests in LLVM): diff --git a/lib/Analysis/ScalarEvolution.cpp b/lib/Analysis/ScalarEvolution.cpp index daf7742..b10fab2 100644 --- a/lib/Analysis/ScalarEvolution.cpp +++ b/lib/Analysis/ScalarEvolution.cpp @@ -4293,9 +4293,15 @@

Your patch should include a testcase, see test/Analysis/ScalarEvolution for examples. "BranchInst* " should be "BranchInst *". You should have spaces after the // in your comments. One of the comment lines isn't indented properly. Nick On 8 February 2012 12:05, Marcello Maggioni <hayarms at gmail.com> wrote: > Attached > > 2012/2/8 Marcello Maggioni