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Date: Sun, 18 May 2014 18:35:46 +0300 From: roma1390 <roma1390@...il.com> To: linux-kernel@...r.kernel.org, Morgan Mears <Morgan.Mears@...app.com>, Mikulas Patocka <mpatocka@...hat.com>, Mike Snitzer <snitzer@...hat.com>, Joe Thornber <ejt@...hat.com>, Heinz Mauelshagen <heinzm@...hat.com> Subject: 3.13-1 dm cache possible race condition I think that somehow is got broken cache->nr_dirty # dmsetup status foo0 0 32768 cache 7/4096 1728240 256 1675650 0 0 64 64 4294967295 1 writeback 2 migration_threshold 2048 4 random_threshold 4 sequential_threshold 512 See: 4294967295 this is -1 as is not OK. Kernel: Debian stock 3.13-1-amd64 Actions taken: modprobe brd BLOCKS=$[`blockdev --getsize64 /dev/ram0`/512] METADATA_DEV=/dev/ram0 CACHE_DEV=/dev/ram1 DATA_DEV=/dev/ram2 dmsetup create foo0 --table "0 $BLOCKS cache $METADATA_DEV $CACHE_DEV $DATA_DEV 512 1 writeback default 0" Test: one terminal window: while true; do dd if=/dev/zero of=/dev/mapper/foo0 bs=512; done second window: while sleep .1; do dmsetup status foo0; done after some time from 0 i get to 4294967295, which is think is not expected value. More info: device just created: 0 32768 cache 10/4096 1728259 256 1675650 0 0 0 64 0 1 writeback 2 migration_threshold 2048 4 random_threshold 4 sequential_threshold 512 after some (~20) writes: 0 32768 cache 10/4096 1790456 256 1737543 0 0 0 64 0 1 writeback 2 migration_threshold 2048 4 random_threshold 4 sequential_threshold 512 started full speed test, after 2 sec: 0 32768 cache 10/4096 2475934 256 2417479 0 0 0 64 0 1 writeback 2 migration_threshold 2048 4 random_threshold 4 sequential_threshold 512 0 32768 cache 10/4096 2485872 256 2428545 0 0 0 64 5 1 writeback 2 migration_threshold 2048 4 random_threshold 4 sequential_threshold 512 0 32768 cache 10/4096 2495964 256 2437959 0 0 0 64 0 1 writeback 2 migration_threshold 2048 4 random_threshold 4 sequential_threshold 512 0 32768 cache 10/4096 2506447 256 2447365 0 0 0 64 20 1 writeback 2 migration_threshold 2048 4 random_threshold 4 sequential_threshold 512 0 32768 cache 10/4096 2515948 256 2458439 0 0 0 64 0 1 writeback 2 migration_threshold 2048 4 random_threshold 4 sequential_threshold 512 0 32768 cache 10/4096 2526687 256 2466631 0 0 0 64 0 1 writeback 2 migration_threshold 2048 4 random_threshold 4 sequential_threshold 512 after ~10sec: 0 32768 cache 10/4096 2667754 256 2609991 0 0 0 64 0 1 writeback 2 migration_threshold 2048 4 random_threshold 4 sequential_threshold 512 0 32768 cache 10/4096 2678571 256 2618183 0 0 0 64 4294967295 1 writeback 2 migration_threshold 2048 4 random_threshold 4 sequential_threshold 512 0 32768 cache 10/4096 2687846 256 2630471 0 0 0 64 4294967295 1 writeback 2 migration_threshold 2048 4 random_threshold 4 sequential_threshold 512 0 32768 cache 10/4096 2698349 256 2638663 0 0 0 64 4294967295 1 writeback 2 migration_threshold 2048 4 random_threshold 4 sequential_threshold 512 0 32768 cache 10/4096 2708082 256 2648514 0 0 0 64 5 1 writeback 2 migration_threshold 2048 4 random_threshold 4 sequential_threshold 512 0 32768 cache 10/4096 2717700 256 2659143 0 0 0 64 4294967295 1 writeback 2 migration_threshold 2048 4 random_threshold 4 sequential_threshold 512 0 32768 cache 10/4096 2728596 256 2667335 0 0 0 64 4294967295 1 writeback 2 migration_threshold 2048 4 random_threshold 4 sequential_threshold 512 0 32768 cache 10/4096 2737453 256 2679623 0 0 0 64 4294967295 1 writeback 2 migration_threshold 2048 4 random_threshold 4 sequential_threshold 512 ^C -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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