From: David Jander Subject: Re: ext4: journal has aborted Date: Fri, 4 Jul 2014 13:28:02 +0200 Message-ID: <20140704132802.0d43b1fc@archvile> References: <20140701082619.1ac77f1d@archvile> <20140701084206.GG9743@birch.djwong.org> <20140703134338.GE2374@thunk.org> <20140703161551.5fd13245@archvile> <87tx6yzdxz.fsf@openvz.org> <20140704114031.2915161a@archvile> <87r421zavi.fsf@openvz.org> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: "Theodore Ts'o" , Matteo Croce , "Darrick J. Wong" , linux-ext4@vger.kernel.org To: Dmitry Monakhov Return-path: Received: from protonic.xs4all.nl ([83.163.252.89]:9246 "EHLO protonic.xs4all.nl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754510AbaGDL1z (ORCPT ); Fri, 4 Jul 2014 07:27:55 -0400 In-Reply-To: <87r421zavi.fsf@openvz.org> Sender: linux-ext4-owner@vger.kernel.org List-ID: On Fri, 04 Jul 2014 14:17:21 +0400 Dmitry Monakhov wrote: > On Fri, 4 Jul 2014 11:40:31 +0200, David Jander wrote: > > > > Hi Dmitry, > > > > On Thu, 03 Jul 2014 18:58:48 +0400 > > Dmitry Monakhov wrote: > > > > > On Thu, 3 Jul 2014 16:15:51 +0200, David Jander wrote: > > > > > > > > Hi Ted, > > > > > > > > On Thu, 3 Jul 2014 09:43:38 -0400 > > > > "Theodore Ts'o" wrote: > > > > > > > > > On Tue, Jul 01, 2014 at 10:55:11AM +0200, Matteo Croce wrote: > > > > > > 2014-07-01 10:42 GMT+02:00 Darrick J. Wong : > > > > > > > > > > > > I have a Samsung SSD 840 PRO > > > > > > > > > > Matteo, > > > > > > > > > > For you, you said you were seeing these problems on 3.15. Was it > > > > > *not* happening for you when you used an older kernel? If so, that > > > > > would help us try to provide the basis of trying to do a bisection > > > > > search. > > > > > > > > I also tested with 3.15, and there too I see the same problem. > > > > > > > > > Using the kvm-xfstests infrastructure, I've been trying to reproduce > > > > > the problem as follows: > > > > > > > > > > ./kvm-xfstests --no-log -c 4k generic/075 ; e2fsck -p /dev/heap/test-4k ; e2fsck -f /dev/heap/test-4k > > > > > > > > > > xfstests geneeric/075 runs fsx which does a fair amount of block > > > > > allocation deallocations, and then after the test finishes, it first > > > > > replays the journal (e2fsck -p) and then forces a fsck run on the > > > > > test disk that I use for the run. > > > > > > > > > > After I launch this, in a separate window, I do this: > > > > > > > > > > sleep 60 ; killall qemu-system-x86_64 > > > > > > > > > > This kills the qemu process midway through the fsx test, and then I > > > > > see if I can find a problem. I haven't had a chance to automate this > > > > > yet, and it is my intention to try to set this up where I can run this > > > > > on a ramdisk or a SSD, so I can more closely approximate what people > > > > > are reporting on flash-based media. > > > > > > > > > > So far, I haven't been able to reproduce the problem. If after doing > > > > > a large number of times, it can't be reproduced (especially if it > > > > > can't be reproduced on an SSD), then it would lead us to believe that > > > > > one of two things is the cause. (a) The CACHE FLUSH command isn't > > > > > properly getting sent to the device in some cases, or (b) there really > > > > > is a hardware problem with the flash device in question. > > > > > > > > Could (a) be caused by a bug in the mmc subsystem or in the MMC peripheral > > > > driver? Can you explain why I don't see any problems with EXT3? > > > > > > > > I can't discard the possibility of (b) because I cannot prove it, but I will > > > > try to see if I can do the same test on a SSD which I happen to have on that > > > > platform. That should be able to rule out problems with the eMMC chip and > > > > -driver, right? > > > > > > > > Do you know a way to investigate (a) (CACHE FLUSH not being sent correctly)? > > > > > > > > I left the system running (it started from a dirty EXT4 partition), and I am > > > > seen the following error pop up after a few minutes. The system is not doing > > > > much (some syslog activity maybe, but not much more): > > > > > > > > [ 303.072983] EXT4-fs (mmcblk1p2): error count: 4 > > > > [ 303.077558] EXT4-fs (mmcblk1p2): initial error at 1404216838: ext4_mb_generate_buddy:756 > > > > [ 303.085690] EXT4-fs (mmcblk1p2): last error at 1404388969: ext4_mb_generate_buddy:757 > > > > > > > > What does that mean? > > > This means that it found previous error in internal ext4's log. Which is > > > normal because your fs was corrupted before. It is reasonable to > > > recreate filesystem from very beginning. > > > > > > In order to understand whenever it is regression in eMMC driver it is > > > reasonable to run integrity test for a device itself. You can run > > > any integrity test you like, For example just run a fio's job > > > "fio disk-verify2.fio" (see attachment), IMPORTANT this script will > > > destroy data on test partition. If it failed with errors like > > > follows "verify: bad magic header XXX" than it is definitely a drivers issue. > > > > I have been trying to run fio on my board with your configuration file, but I > > am having problems, and since I am not familiar with fio at all, I can't > > really figure out what's wrong. My eMMC device is only 916MiB in size, so I > > edited the last part to be: > > > > offset_increment=100M > > size=100M > > > > Is that ok? > > > > I still get error messages complaining about blocksize though. Here is the > > output I get (can't really make sense of it): > > > > # ./fio ../disk-verify2.fio > > Multiple writers may overwrite blocks that belong to other jobs. This can cause verification failures. > > /dev/mmcblk1p2: (g=0): rw=randwrite, bs=4K-4K/4K-4K/4K-4K, ioengine=libaio, iodepth=32 > > ... > > fio-2.1.10-49-gf302 > > Starting 4 processes > > fio: blocksize too large for data set > > fio: blocksize too large for data set > > fio: blocksize too large for data set > > fio: io_u.c:1315: __get_io_u: Assertion `io_u->flags & IO_U_F_FREE' failed.ta 00m:00s] > > fio: pid=7612, got signal=6 > > > > /dev/mmcblk1p2: (groupid=0, jobs=1): err= 0: pid=7612: Fri Jul 4 09:31:15 2014 > > lat (msec) : 4=0.19%, 10=0.19%, 20=0.19%, 50=0.85%, 100=1.23% > > lat (msec) : 250=56.01%, 500=37.18%, 750=1.14% > > cpu : usr=0.00%, sys=0.00%, ctx=0, majf=0, minf=0 > > IO depths : 1=0.1%, 2=0.2%, 4=0.4%, 8=0.8%, 16=1.5%, 32=97.1%, >=64=0.0% > > submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0% > > complete : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0% > > issued : total=r=33/w=1024/d=0, short=r=0/w=0/d=0 > > latency : target=0, window=0, percentile=100.00%, depth=32 > > > > Run status group 0 (all jobs): > > > > Disk stats (read/write): > > mmcblk1: ios=11/1025, merge=0/0, ticks=94/6671, in_queue=7121, util=96.12% > > fio: file hash not empty on exit > > > > > > This assertion bugs me. Is it due to the previous errors ("blocksize too large > > for data set") or is is because my eMMC drive/kernel is seriously screwed? > > > > Help please! > Ohhh. Actually this is axboe's crap. Recent fio's version is broken. > Please use old good commit ffa93ca9d8d37ef > git checkout git://git.kernel.dk/fio.git > cd fio > git checkout -b b2.0.13 ffa93ca9d8d37ef > make -j4 > ./fio ffa93ca9d8d37ef Ok, that fixed it... :-) Here is the output I am getting... AFAICS no problems on the raw device. Is this sufficient testing, Ted? # ./fio ../disk-verify2.fio Multiple writers may overwrite blocks that belong to other jobs. This can cause verification failures. /dev/mmcblk1p2: (g=0): rw=randwrite, bs=4K-4K/4K-4K/4K-4K, ioengine=libaio, iodepth=32 ... /dev/mmcblk1p2: (g=0): rw=randwrite, bs=4K-4K/4K-4K/4K-4K, ioengine=libaio, iodepth=32 fio-2.0.13 Starting 4 processes Jobs: 4 (f=4): [wVww] [100.0% done] [339K/523K/0K /s] [84 /130 /0 iops] [eta 00m:00s] /dev/mmcblk1p2: (groupid=0, jobs=1): err= 0: pid=1157: Fri Jul 4 11:22:53 2014 write: io=448828KB, bw=127664 B/s, iops=31 , runt=3600049msec slat (msec): min=1 , max=1821 , avg=30.33, stdev=66.98 clat (usec): min=52 , max=5463.3K, avg=910506.27, stdev=554911.89 lat (msec): min=5 , max=5531 , avg=940.84, stdev=567.60 clat percentiles (msec): | 1.00th=[ 159], 5.00th=[ 253], 10.00th=[ 351], 20.00th=[ 465], | 30.00th=[ 578], 40.00th=[ 685], 50.00th=[ 791], 60.00th=[ 914], | 70.00th=[ 1074], 80.00th=[ 1270], 90.00th=[ 1614], 95.00th=[ 1958], | 99.00th=[ 2802], 99.50th=[ 3163], 99.90th=[ 4228], 99.95th=[ 4555], | 99.99th=[ 5211] bw (KB/s) : min= 3, max= 944, per=37.55%, avg=139.69, stdev=93.70 lat (usec) : 100=0.01% lat (msec) : 2=0.01%, 4=0.61%, 10=4.33%, 20=5.93%, 50=16.04% lat (msec) : 100=18.92%, 250=4.74%, 500=9.38%, 750=12.09%, 1000=9.87% lat (msec) : 2000=15.58%, >=2000=2.51% cpu : usr=0.38%, sys=0.59%, ctx=332741, majf=0, minf=0 IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=0.1%, 32=100.0%, >=64=0.0% submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0% complete : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.1%, 64=0.0%, >=64=0.0% issued : total=r=0/w=111616/d=0, short=r=112207/w=0/d=0 /dev/mmcblk1p2: (groupid=0, jobs=1): err= 0: pid=1158: Fri Jul 4 11:22:53 2014 read : io=352016KB, bw=946262 B/s, iops=231 , runt=380935msec slat (msec): min=2 , max=12334 , avg=261.58, stdev=527.14 clat (msec): min=18 , max=6145 , avg=59.95, stdev=221.07 lat (msec): min=21 , max=12360 , avg=321.53, stdev=570.56 clat percentiles (msec): | 1.00th=[ 22], 5.00th=[ 23], 10.00th=[ 23], 20.00th=[ 25], | 30.00th=[ 25], 40.00th=[ 26], 50.00th=[ 27], 60.00th=[ 28], | 70.00th=[ 29], 80.00th=[ 34], 90.00th=[ 43], 95.00th=[ 198], | 99.00th=[ 865], 99.50th=[ 1500], 99.90th=[ 3687], 99.95th=[ 3916], | 99.99th=[ 6128] write: io=352072KB, bw=111995 B/s, iops=27 , runt=3219084msec slat (msec): min=1 , max=12214 , avg=36.47, stdev=175.23 clat (usec): min=20 , max=12325K, avg=224666.84, stdev=487725.70 lat (msec): min=2 , max=12333 , avg=261.14, stdev=527.05 clat percentiles (usec): | 1.00th=[ 25], 5.00th=[ 28], 10.00th=[ 8032], 20.00th=[21376], | 30.00th=[38144], 40.00th=[57088], 50.00th=[84480], 60.00th=[132096], | 70.00th=[224256], 80.00th=[288768], 90.00th=[477184], 95.00th=[782336], | 99.00th=[2072576], 99.50th=[2932736], 99.90th=[5865472], 99.95th=[7503872], | 99.99th=[12255232] bw (KB/s) : min= 0, max= 8, per=1.13%, avg= 4.20, stdev= 2.05 lat (usec) : 50=3.49%, 100=0.08% lat (msec) : 4=0.20%, 10=2.37%, 20=3.64%, 50=54.33%, 100=9.55% lat (msec) : 250=12.29%, 500=8.59%, 750=2.25%, 1000=1.04%, 2000=1.49% lat (msec) : >=2000=0.69% cpu : usr=0.28%, sys=0.38%, ctx=199155, majf=0, minf=0 IO depths : 1=7.1%, 2=14.3%, 4=28.6%, 8=50.0%, 16=0.0%, 32=0.0%, >=64=0.0% submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0% complete : 0=0.0%, 4=0.0%, 8=0.0%, 16=100.0%, 32=0.0%, 64=0.0%, >=64=0.0% issued : total=r=0/w=88004/d=0, short=r=88018/w=0/d=0 /dev/mmcblk1p2: (groupid=0, jobs=1): err= 0: pid=1159: Fri Jul 4 11:22:53 2014 read : io=270648KB, bw=164244 B/s, iops=40 , runt=1687389msec slat (msec): min=1 , max=2338 , avg=28.22, stdev=72.10 clat (msec): min=1 , max=2747 , avg=24.77, stdev=68.06 lat (msec): min=3 , max=2753 , avg=52.99, stdev=105.59 clat percentiles (msec): | 1.00th=[ 3], 5.00th=[ 3], 10.00th=[ 4], 20.00th=[ 6], | 30.00th=[ 6], 40.00th=[ 7], 50.00th=[ 7], 60.00th=[ 8], | 70.00th=[ 9], 80.00th=[ 10], 90.00th=[ 35], 95.00th=[ 178], | 99.00th=[ 269], 99.50th=[ 367], 99.90th=[ 734], 99.95th=[ 914], | 99.99th=[ 1942] write: io=270648KB, bw=144929 B/s, iops=35 , runt=1912261msec slat (msec): min=1 , max=2338 , avg=28.04, stdev=72.08 clat (usec): min=20 , max=4560 , avg=27.39, stdev=40.17 lat (msec): min=1 , max=2338 , avg=28.07, stdev=72.08 clat percentiles (usec): | 1.00th=[ 22], 5.00th=[ 23], 10.00th=[ 23], 20.00th=[ 24], | 30.00th=[ 24], 40.00th=[ 25], 50.00th=[ 25], 60.00th=[ 26], | 70.00th=[ 26], 80.00th=[ 27], 90.00th=[ 30], 95.00th=[ 41], | 99.00th=[ 54], 99.50th=[ 65], 99.90th=[ 81], 99.95th=[ 98], | 99.99th=[ 2160] bw (KB/s) : min= 1, max= 8, per=1.40%, avg= 5.22, stdev= 1.68 lat (usec) : 50=49.15%, 100=0.83%, 250=0.01%, 500=0.01% lat (msec) : 2=0.31%, 4=7.00%, 10=33.14%, 20=2.84%, 50=2.10% lat (msec) : 100=0.89%, 250=2.99%, 500=0.61%, 750=0.09%, 1000=0.03% lat (msec) : 2000=0.02%, >=2000=0.01% cpu : usr=0.34%, sys=0.58%, ctx=179182, majf=0, minf=0 IO depths : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0% submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0% complete : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0% issued : total=r=0/w=67662/d=0, short=r=67662/w=0/d=0 /dev/mmcblk1p2: (groupid=0, jobs=1): err= 0: pid=1160: Fri Jul 4 11:22:53 2014 read : io=269304KB, bw=161896 B/s, iops=39 , runt=1703357msec slat (msec): min=1 , max=2787 , avg=28.12, stdev=69.99 clat (msec): min=1 , max=2876 , avg=25.13, stdev=70.53 lat (msec): min=3 , max=3065 , avg=53.26, stdev=105.59 clat percentiles (msec): | 1.00th=[ 3], 5.00th=[ 3], 10.00th=[ 4], 20.00th=[ 6], | 30.00th=[ 6], 40.00th=[ 7], 50.00th=[ 7], 60.00th=[ 8], | 70.00th=[ 9], 80.00th=[ 10], 90.00th=[ 36], 95.00th=[ 178], | 99.00th=[ 269], 99.50th=[ 375], 99.90th=[ 742], 99.95th=[ 1012], | 99.99th=[ 1844] write: io=269304KB, bw=145424 B/s, iops=35 , runt=1896288msec slat (msec): min=1 , max=2787 , avg=27.94, stdev=69.97 clat (usec): min=20 , max=4580 , avg=27.51, stdev=44.68 lat (msec): min=1 , max=2787 , avg=27.98, stdev=69.97 clat percentiles (usec): | 1.00th=[ 22], 5.00th=[ 23], 10.00th=[ 23], 20.00th=[ 24], | 30.00th=[ 24], 40.00th=[ 25], 50.00th=[ 25], 60.00th=[ 25], | 70.00th=[ 26], 80.00th=[ 27], 90.00th=[ 30], 95.00th=[ 40], | 99.00th=[ 54], 99.50th=[ 65], 99.90th=[ 82], 99.95th=[ 105], | 99.99th=[ 2160] bw (KB/s) : min= 1, max= 8, per=1.42%, avg= 5.30, stdev= 1.56 lat (usec) : 50=49.18%, 100=0.79%, 250=0.01%, 500=0.01% lat (msec) : 2=0.45%, 4=6.66%, 10=33.29%, 20=2.93%, 50=2.03% lat (msec) : 100=0.86%, 250=3.03%, 500=0.63%, 750=0.09%, 1000=0.02% lat (msec) : 2000=0.02%, >=2000=0.01% cpu : usr=0.35%, sys=0.58%, ctx=179806, majf=0, minf=0 IO depths : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0% submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0% complete : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0% issued : total=r=0/w=67326/d=0, short=r=67326/w=0/d=0 Run status group 0 (all jobs): READ: io=891968KB, aggrb=523KB/s, minb=158KB/s, maxb=924KB/s, mint=380935msec, maxt=1703357msec WRITE: io=1309.5MB, aggrb=372KB/s, minb=109KB/s, maxb=142KB/s, mint=1896288msec, maxt=3600049msec Disk stats (read/write): mmcblk1: ios=514970/335209, merge=2162/0, ticks=17103230/10385442, in_queue=27486452, util=100.00% Best regards, -- David Jander Protonic Holland.