running iozone on bcache0 device yields wrongly read data

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Hi all

I've spent some time on IRC today (thanks eegiks for input) but I fear
the problem I encountered is not solved yet.

http://pastebin.com/t0di2MKi

has some kind of summary on which kind of machine I am running and what
command lines switches I use for iozone. It seems I need to go at least
to -s 1g to start triggering this issue (latest run output attached).

I've tried it with an almost vanilla 3.11.0 and a patched
3.11.1+bcache-for-3.11 kernel but both show this issue. A cross test on
a similar host but only using an HDD did not show this issue.

Any clues/hints how to figure out if this is caused by the underlying
hardware or if this is something internal to bcache? What else would you
need as input? Shall I switch on debugging and what can I do to help you
figure out what's wrong?

Cheers

Carsten

-- 
Dr. Carsten Aulbert - Max Planck Institute for Gravitational Physics
Callinstrasse 38, 30167 Hannover, Germany
phone/fax: +49 511 762-17185 / -17193
https://wiki.atlas.aei.uni-hannover.de/foswiki/bin/view/ATLAS/WebHome
	Iozone: Performance Test of File I/O
	        Version $Revision: 3.397 $
		Compiled for 64 bit mode.
		Build: linux-AMD64 

	Contributors:William Norcott, Don Capps, Isom Crawford, Kirby Collins
	             Al Slater, Scott Rhine, Mike Wisner, Ken Goss
	             Steve Landherr, Brad Smith, Mark Kelly, Dr. Alain CYR,
	             Randy Dunlap, Mark Montague, Dan Million, Gavin Brebner,
	             Jean-Marc Zucconi, Jeff Blomberg, Benny Halevy, Dave Boone,
	             Erik Habbinga, Kris Strecker, Walter Wong, Joshua Root,
	             Fabrice Bacchella, Zhenghua Xue, Qin Li, Darren Sawyer.
	             Ben England.

	Run began: Tue Sep 17 18:39:01 2013

	Excel chart generation enabled
	Include fsync in write timing
	File size set to 2097152 KB

	Machine = Linux cass1 3.11.1-atlas #3 SMP Tue Sep 17 18:26:12 CEST 2013 x86_64	Record Size 128 KB
	Record Size 128 KB
	Command line used: iozone -R -e -s 2g -t 32 -M -r 128k
	Output is in Kbytes/sec
	Time Resolution = 0.000001 seconds.
	Processor cache size set to 1024 Kbytes.
	Processor cache line size set to 32 bytes.
	File stride size set to 17 * record size.
	Throughput test with 32 processes
	Each process writes a 2097152 Kbyte file in 128 Kbyte records

	Children see throughput for 32 initial writers 	=   81557.54 KB/sec
	Parent sees throughput for 32 initial writers 	=   79863.75 KB/sec
	Min throughput per process 			=    2480.14 KB/sec 
	Max throughput per process 			=    2609.36 KB/sec
	Avg throughput per process 			=    2548.67 KB/sec
	Min xfer 					= 2011904.00 KB

	Children see throughput for 32 rewriters 	=   79110.97 KB/sec
	Parent sees throughput for 32 rewriters 	=   78721.56 KB/sec
	Min throughput per process 			=    2440.14 KB/sec 
	Max throughput per process 			=    2573.24 KB/sec
	Avg throughput per process 			=    2472.22 KB/sec
	Min xfer 					= 2015616.00 KB

	Children see throughput for 32 readers 		=   63335.91 KB/sec
	Parent sees throughput for 32 readers 		=   63320.14 KB/sec
	Min throughput per process 			=    1901.33 KB/sec 
	Max throughput per process 			=    2106.96 KB/sec
	Avg throughput per process 			=    1979.25 KB/sec
	Min xfer 					= 1892608.00 KB

	Children see throughput for 32 re-readers 	=   66402.77 KB/sec
	Parent sees throughput for 32 re-readers 	=   66381.13 KB/sec
	Min throughput per process 			=    1966.24 KB/sec 
	Max throughput per process 			=    2207.88 KB/sec
	Avg throughput per process 			=    2075.09 KB/sec
	Min xfer 					= 1867776.00 KB

	Children see throughput for 32 reverse readers 	=   28092.60 KB/sec
	Parent sees throughput for 32 reverse readers 	=   28089.99 KB/sec
	Min throughput per process 			=     810.85 KB/sec 
	Max throughput per process 			=     949.42 KB/sec
	Avg throughput per process 			=     877.89 KB/sec
	Min xfer 					= 1791360.00 KB


Error in file: Found ?6d? Expecting ?6d6d6d6d6d6d6d6d? addr 7ff9ff202000
Error in file: Position 1172054016 
Record # 8942 Record size 128 kb 
where 7ff9ff202000 loop 8192


Error in file: Found ?6d? Expecting ?6d6d6d6d6d6d6d6d? addr 7ff9ff21d000
Error in file: Position 1156698112 
Record # 8824 Record size 128 kb 
where 7ff9ff21d000 loop 118784


Error in file: Found ?6d? Expecting ?6d6d6d6d6d6d6d6d? addr 7ff9ff20a000
Error in file: Position 1205641216 
Record # 9198 Record size 128 kb 
where 7ff9ff20a000 loop 40960


Error in file: Found ?6d? Expecting ?6d6d6d6d6d6d6d6d? addr 7ff9ff21d000
Error in file: Position 1232588800 
Record # 9403 Record size 128 kb 
where 7ff9ff21d000 loop 118784


Error in file: Found ?6d? Expecting ?6d6d6d6d6d6d6d6d? addr 7ff9ff21d000
Error in file: Position 920768512 
Record # 7024 Record size 128 kb 
where 7ff9ff21d000 loop 118784


Error in file: Found ?6d? Expecting ?6d6d6d6d6d6d6d6d? addr 7ff9ff21d000
Error in file: Position 983289856 
Record # 7501 Record size 128 kb 
where 7ff9ff21d000 loop 118784


Error in file: Found ?6d? Expecting ?6d6d6d6d6d6d6d6d? addr 7ff9ff21d000
Error in file: Position 876335104 
Record # 6685 Record size 128 kb 
where 7ff9ff21d000 loop 118784


Error in file: Found ?6d? Expecting ?6d6d6d6d6d6d6d6d? addr 7ff9ff20e000
Error in file: Position 990044160 
Record # 7553 Record size 128 kb 
where 7ff9ff20e000 loop 57344


Error in file: Found ?6d? Expecting ?6d6d6d6d6d6d6d6d? addr 7ff9ff21d000
Error in file: Position 1110298624 
Record # 8470 Record size 128 kb 
where 7ff9ff21d000 loop 118784


Error in file: Found ?6d? Expecting ?6d6d6d6d6d6d6d6d? addr 7ff9ff20a000
Error in file: Position 898801664 
Record # 6857 Record size 128 kb 
where 7ff9ff20a000 loop 40960


Error in file: Found ?6d? Expecting ?6d6d6d6d6d6d6d6d? addr 7ff9ff21d000
Error in file: Position 1036898304 
Record # 7910 Record size 128 kb 
where 7ff9ff21d000 loop 118784


Error in file: Found ?6d? Expecting ?6d6d6d6d6d6d6d6d? addr 7ff9ff21d000
Error in file: Position 1052495872 
Record # 8029 Record size 128 kb 
where 7ff9ff21d000 loop 118784


Error in file: Found ?6d? Expecting ?6d6d6d6d6d6d6d6d? addr 7ff9ff21d000
Error in file: Position 996921344 
Record # 7605 Record size 128 kb 
where 7ff9ff21d000 loop 118784


Error in file: Found ?6d? Expecting ?6d6d6d6d6d6d6d6d? addr 7ff9ff202000
Error in file: Position 967843840 
Record # 7384 Record size 128 kb 
where 7ff9ff202000 loop 8192


Error in file: Found ?6d? Expecting ?6d6d6d6d6d6d6d6d? addr 7ff9ff202000
Error in file: Position 1025777664 
Record # 7826 Record size 128 kb 
where 7ff9ff202000 loop 8192


Error in file: Found ?6d? Expecting ?6d6d6d6d6d6d6d6d? addr 7ff9ff20a000
Error in file: Position 1110482944 
Record # 8472 Record size 128 kb 
where 7ff9ff20a000 loop 40960


Error in file: Found ?6d? Expecting ?6d6d6d6d6d6d6d6d? addr 7ff9ff21d000
Error in file: Position 925618176 
Record # 7061 Record size 128 kb 
where 7ff9ff21d000 loop 118784


Error in file: Found ?6d? Expecting ?6d6d6d6d6d6d6d6d? addr 7ff9ff202000
Error in file: Position 1143873536 
Record # 8727 Record size 128 kb 
where 7ff9ff202000 loop 8192


Error in file: Found ?6d? Expecting ?6d6d6d6d6d6d6d6d? addr 7ff9ff20e000
Error in file: Position 803135488 
Record # 6127 Record size 128 kb 
where 7ff9ff20e000 loop 57344


Error in file: Found ?6d? Expecting ?6d6d6d6d6d6d6d6d? addr 7ff9ff21d000
Error in file: Position 1166135296 
Record # 8896 Record size 128 kb 
where 7ff9ff21d000 loop 118784


Error in file: Found ?6d? Expecting ?6d6d6d6d6d6d6d6d? addr 7ff9ff21d000
Error in file: Position 1035194368 
Record # 7897 Record size 128 kb 
where 7ff9ff21d000 loop 118784


Error in file: Found ?6d? Expecting ?6d6d6d6d6d6d6d6d? addr 7ff9ff202000
Error in file: Position 1121460224 
Record # 8556 Record size 128 kb 
where 7ff9ff202000 loop 8192


Error in file: Found ?6d? Expecting ?6d6d6d6d6d6d6d6d? addr 7ff9ff20a000
Error in file: Position 1036951552 
Record # 7911 Record size 128 kb 
where 7ff9ff20a000 loop 40960


Error in file: Found ?6d? Expecting ?6d6d6d6d6d6d6d6d? addr 7ff9ff21d000
Error in file: Position 1088147456 
Record # 8301 Record size 128 kb 
where 7ff9ff21d000 loop 118784


Error in file: Found ?6d? Expecting ?6d6d6d6d6d6d6d6d? addr 7ff9ff21d000
Error in file: Position 1208602624 
Record # 9220 Record size 128 kb 
where 7ff9ff21d000 loop 118784


Error in file: Found ?6d? Expecting ?6d6d6d6d6d6d6d6d? addr 7ff9ff20a000
Error in file: Position 972333056 
Record # 7418 Record size 128 kb 
where 7ff9ff20a000 loop 40960


Error in file: Found ?6d? Expecting ?6d6d6d6d6d6d6d6d? addr 7ff9ff21d000
Error in file: Position 970182656 
Record # 7401 Record size 128 kb 
where 7ff9ff21d000 loop 118784


Error in file: Found ?6d? Expecting ?6d6d6d6d6d6d6d6d? addr 7ff9ff20a000
Error in file: Position 1054908416 
Record # 8048 Record size 128 kb 
where 7ff9ff20a000 loop 40960


Error in file: Found ?6d? Expecting ?6d6d6d6d6d6d6d6d? addr 7ff9ff20a000
Error in file: Position 890150912 
Record # 6791 Record size 128 kb 
where 7ff9ff20a000 loop 40960


Error in file: Found ?6d? Expecting ?6d6d6d6d6d6d6d6d? addr 7ff9ff21d000
Error in file: Position 983945216 
Record # 7506 Record size 128 kb 
where 7ff9ff21d000 loop 118784


Error in file: Found ?6d? Expecting ?6d6d6d6d6d6d6d6d? addr 7ff9ff20a000
Error in file: Position 825532416 
Record # 6298 Record size 128 kb 
where 7ff9ff20a000 loop 40960


Error in file: Found ?6d? Expecting ?6d6d6d6d6d6d6d6d? addr 7ff9ff21d000
Error in file: Position 710004736 
Record # 5416 Record size 128 kb 
where 7ff9ff21d000 loop 118784

	Children see throughput for 32 stride readers 	=       0.00 KB/sec
	Parent sees throughput for 32 stride readers 	=       0.00 KB/sec
	Min throughput per process 			=       0.00 KB/sec 
	Max throughput per process 			=       0.00 KB/sec
	Avg throughput per process 			=       0.00 KB/sec
	Min xfer 					=       0.00 KB
iozone.DUMMY.30: No such file or directory
iozone.DUMMY.28: No such file or directory
iozone.DUMMY.20: No such file or directory
iozone.DUMMY.19: No such file or directory
iozone.DUMMY.26: No such file or directory
iozone.DUMMY.0: No such file or directory
iozone.DUMMY.21: No such file or directory
iozone.DUMMY.18: No such file or directory
iozone.DUMMY.1: No such file or directory
iozone.DUMMY.22: No such file or directory
iozone.DUMMY.16: No such file or directory
iozone.DUMMY.2: No such file or directory
iozone.DUMMY.3: No such file or directory
iozone.DUMMY.23: No such file or directory
iozone.DUMMY.17: No such file or directory
iozone.DUMMY.4: No such file or directory
iozone.DUMMY.5: No such file or directory
iozone.DUMMY.24: No such file or directory
iozone.DUMMY.15: No such file or directory
iozone.DUMMY.6: No such file or directory
iozone.DUMMY.7: No such file or directory
iozone.DUMMY.25: No such file or directory
iozone.DUMMY.14: No such file or directory
iozone.DUMMY.8: No such file or directory
iozone.DUMMY.13: No such file or directory
iozone.DUMMY.9: No such file or directory
iozone.DUMMY.12: No such file or directory
iozone.DUMMY.11: No such file or directory
iozone.DUMMY.10: No such file or directory
iozone.DUMMY.29: No such file or directory
iozone.DUMMY.27: No such file or directory
iozone.DUMMY.31: No such file or directory

Attachment: smime.p7s
Description: S/MIME Cryptographic Signature


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