Hi, An illegal instruction this time http://tracker.ceph.com/issues/7914#note-31 . Since the workload is slightly different, I'm trying to run it 30 times and see if that triggers the problem.
Cheers On 02/04/2014 20:15, Kevin Greenan wrote: > OK, it looks like this happens when the GF backend is first initialized > (unless, like Loic pointed out, something is corrupted). > > Is this consistently happening for carry-free multiply and w=32 (i.e. > gf_w32_cfm_init)? > > Can you send me a core + binary, so I can dig in gdb? > > -kevin > > > On Wed, Apr 2, 2014 at 11:01 AM, Sage Weil <s...@inktank.com > <mailto:s...@inktank.com>> wrote: > > On Wed, 2 Apr 2014, Loic Dachary wrote: > > > > > > On 02/04/2014 19:44, Kevin Greenan wrote: > > > Hey Loic, > > > > > > Are you ensuring that Jerasure (actually gf-complete) is getting > memory buffers aligned on 16-byte boundaries? Without looking too deep, that > is the first thing I would check. > > > > > > > Yes > > > > > https://github.com/ceph/ceph/blob/master/src/erasure-code/jerasure/ErasureCodeJerasure.cc#L32 > > > https://github.com/ceph/ceph/blob/master/src/erasure-code/jerasure/ErasureCodeJerasure.cc#L242 > > > https://github.com/ceph/ceph/blob/master/src/erasure-code/jerasure/ErasureCodeJerasure.cc#L65 > > > https://github.com/ceph/ceph/blob/master/src/erasure-code/jerasure/ErasureCodeJerasure.cc#L108 > > > > In this case they are 2K aligned: > > (gdb) p data_ptrs[0] > $1 = 0x3e46000 "I'm the", ' ' <repeats 16 times>, "3th object!" > (gdb) p data_ptrs[1] > $2 = 0x3e46800 'z' <repeats 200 times>... > (gdb) p coding_ptrs[0] > $3 = 0x338e000 "I'm the", ' ' <repeats 16 times>, "3th object!" > > sage > > > I'll re-read this logic tomorrow just to be sure. > > > > Cheers > > > > > I can have a deeper look later today or tomorrow. > > > > > > -kevin > > > > > > > > > On Wed, Apr 2, 2014 at 10:35 AM, Loic Dachary <l...@dachary.org > <mailto:l...@dachary.org> <mailto:l...@dachary.org > <mailto:l...@dachary.org>>> wrote: > > > > > > Hi Kevin, > > > > > > In the context of http://tracker.ceph.com/issues/7914 we're > trying to figure out why jerasure dumps core. We don't know how to reproduce > it yet (ran dozens of identical tests suites with no such crash in the past > few days, which is to be expected for rare bugs because the test suite > introduces random errors / failures on purpose). > > > > > > The full stack trace is at > http://tracker.ceph.com/issues/7914#note-24 but the relevant part is here: > > > > > > #0 0x00007f4756779b7b in raise (sig=<optimized out>) at > ../nptl/sysdeps/unix/sysv/linux/pt-raise.c:42 > > > #1 0x0000000000981b4e in reraise_fatal (signum=11) at > global/signal_handler.cc:59 > > > #2 handle_fatal_signal (signum=11) at > global/signal_handler.cc:105 > > > #3 <signal handler called> > > > #4 0x0000000000000000 in ?? () > > > #5 0x00007f47385ae6b1 in jerasure_matrix_dotprod (k=2, w=8, > matrix_row=0x31513a8, src_ids=0x0, dest_id=<optimized out>, > data_ptrs=0x7f4741ec7a00, coding_ptrs=0x7f4741ec7a10, > > > size=2048) at > erasure-code/jerasure/jerasure/src/jerasure.c:607 > > > #6 0x00007f47385ae7d6 in jerasure_matrix_encode (k=2, m=1, w=8, > matrix=<optimized out>, data_ptrs=0x7f4741ec7a00, coding_ptrs=0x7f4741ec7a10, > size=2048) > > > at erasure-code/jerasure/jerasure/src/jerasure.c:310 > > > ... > > > > > > Note that this jerasure/gf-complete combination has been compiled > with SSE4.1, SSE4.2, PCLMUL, SSSE3, SSE3, SSE2, SSE flags activated. These > are jerasure v2 and gf-complete v1, only slightly modified as found in > https://github.com/ceph/jerasure/tree/v2-ceph and > https://github.com/ceph/gf-complete/tree/v1-ceph (all commits there have a > pending pull request under https://bitbucket.org/jimplank/gf-complete > https://bitbucket.org/jimplank/jerasure, nothing you've not seen before). > > > > > > #5 is > https://github.com/ceph/jerasure/blob/v2-ceph/src/jerasure.c#L607 > > > > > > and then it dives into gf-complete and most probably destroyed > part of the stack when corrupting memory. I'll be chasing this tomorrow. If > you have a brilliant idea on why that happens, I'll take it ;-) > > > > > > Cheers > > > > > > -- > > > Loïc Dachary, Artisan Logiciel Libre > > > > > > > > > > -- > > Loïc Dachary, Artisan Logiciel Libre > > > > > > -- Loïc Dachary, Artisan Logiciel Libre
signature.asc
Description: OpenPGP digital signature
