From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Nelson Subject: Re: segfault in bluestore during random writes Date: Wed, 6 Jul 2016 07:00:51 -0500 Message-ID: References: <0b69c134-ffa9-1918-b4f5-ca9cc0cd7fbe@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mx1.redhat.com ([209.132.183.28]:52385 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753037AbcGFMAy (ORCPT ); Wed, 6 Jul 2016 08:00:54 -0400 In-Reply-To: Sender: ceph-devel-owner@vger.kernel.org List-ID: To: Varada Kari , ceph-devel Hi Varada, Ah, this version happens to be with the memstoredb patch applied, though it is unused in this test. I don't believe this should be causing the problem, but I'll verify it is happening without that patch as well. Mark On 07/06/2016 01:45 AM, Varada Kari wrote: > Hi mark, > > I have tried reproducing the issue with latest master, so far no luck > with 128k and 512k block sizes on a 1000GB rbd image. > I couldn't find #5e07e5a3446ee39189c5b959be624411561175f5 in master, are > you using any private changes? > > I will try some more time today to reproduce the issue. Seems blob map > got corrupted in your case. > > Varada > > On Tuesday 05 July 2016 09:06 PM, Mark Nelson wrote: >> Hi Guys, >> >> This is primarily for Varada but if anyone else wants to take a look >> feel free. We are hitting segfaults in tc_state_proc during random >> writes. I was able to reproduce with logging enabled and got a core >> dump. I've only briefly looked at the code/logs, but I haven't really >> looked through it in earnest yet. Unfortunately the logs are about 4GB >> and the core dump is 2GB, so I'll only attach the last 10k lines. >> Hopefully it should be fairly reproducible. I'll try to see if I can >> narrow down commits that have touched the write path over the last 4 >> weeks and see if anything looks relevant. >> >> Varada: let me know if you can reproduce. Thanks! >> >> gdb bt: >> >>> (gdb) bt >>> #0 0x00007f9c59708fcb in raise (sig=11) at ../nptl/sysdeps/unix/sysv/linux/pt-raise.c:37 >>> #1 0x0000000000bd7505 in reraise_fatal (signum=11) at /home/ubuntu/src/markhpc/ceph/src/global/signal_handler.cc:69 >>> #2 handle_fatal_signal (signum=11) at /home/ubuntu/src/markhpc/ceph/src/global/signal_handler.cc:133 >>> #3 >>> #4 next_node (node=) at /usr/include/boost/intrusive/detail/tree_algorithms.hpp:446 >>> #5 next_node (p=) at /usr/include/boost/intrusive/rbtree_algorithms.hpp:352 >>> #6 operator++ (this=) at /usr/include/boost/intrusive/detail/tree_node.hpp:128 >>> #7 BlueStore::_txc_state_proc (this=this@entry=0xaff6000, txc=txc@entry=0x192c8c80) at /home/ubuntu/src/markhpc/ceph/src/os/bluestore/BlueStore.cc:4568 >>> #8 0x0000000000aeddb7 in BlueStore::_txc_finish_io (this=this@entry=0xaff6000, txc=txc@entry=0x192c8c80) at /home/ubuntu/src/markhpc/ceph/src/os/bluestore/BlueStore.cc:4669 >>> #9 0x0000000000aed23f in BlueStore::_txc_state_proc (this=0xaff6000, txc=0x192c8c80) at /home/ubuntu/src/markhpc/ceph/src/os/bluestore/BlueStore.cc:4559 >>> #10 0x0000000000bc134a in KernelDevice::_aio_thread (this=0xaf20960) at /home/ubuntu/src/markhpc/ceph/src/os/bluestore/KernelDevice.cc:270 >>> #11 0x0000000000bc588d in KernelDevice::AioCompletionThread::entry (this=) at /home/ubuntu/src/markhpc/ceph/src/os/bluestore/KernelDevice.h:49 >>> #12 0x00007f9c59701dc5 in start_thread (arg=0x7f9c4da2e700) at pthread_create.c:308 >>> #13 0x00007f9c575fc28d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113 >>> (gdb) frame 7 >>> #7 BlueStore::_txc_state_proc (this=this@entry=0xaff6000, txc=txc@entry=0x192c8c80) at /home/ubuntu/src/markhpc/ceph/src/os/bluestore/BlueStore.cc:4568 >>> 4568for (auto& p : o->blob_map.blob_map) { >> Mark > > PLEASE NOTE: The information contained in this electronic mail message is intended only for the use of the designated recipient(s) named above. If the reader of this message is not the intended recipient, you are hereby notified that you have received this message in error and that any review, dissemination, distribution, or copying of this message is strictly prohibited. If you have received this communication in error, please notify the sender by telephone or e-mail (as shown above) immediately and destroy any and all copies of this message in your possession (whether hard copies or electronically stored copies). >