W dniu 26.08.2016 o 04:26, Kent Overstreet pisze: > On Thu, Aug 25, 2016 at 12:13:53PM +0200, Marcin Mirosław wrote: >> Hi! >> >> 1. >> # ./bcache format --compression_type=lz4 --error_action=readonly >> --tier=0 /dev/system10/bcache --tier=1 /dev/sdd1 >> /dev/system10/bcache contains a bcache filesystem >> Proceed anyway? (y,n) y >> /dev/sdd1 contains a bcache filesystem >> Proceed anyway? (y,n) y >> UUID: ab597c6a-7394-41ff-9138-e66c5722bc9d >> Set UUID: 311a03a9-3646-40a8-935f-10030ee75b25 >> version: 6 >> nbuckets: 22288 >> block_size: 1 >> bucket_size: 1024 >> nr_in_set: 2 >> nr_this_dev: 0 >> first_bucket: 3 >> UUID: 2ac11eef-6d66-4ca0-bd6e-17ac83c6942a >> Set UUID: 311a03a9-3646-40a8-935f-10030ee75b25 >> version: 6 >> nbuckets: 40960 >> block_size: 1 >> bucket_size: 1024 >> nr_in_set: 2 >> nr_this_dev: 1 >> first_bucket: 3 >> >> >> # mount -o noatime -t bcache /dev/system10/bcache:/dev/sdd1 /mnt/test >> # dd if=/dev/urandom of=/mnt/test/randomdata bs=1M count=1000 >> # md5sum /mnt/test/randomdata >> a7d2712c673d891d9ba50f2f7157c091 /mnt/test/randomdata >> # cat /sys/fs/bcache/311a03a9-3646-40a8-935f-10030ee75b25/tiering_percent >> 10 >> # echo 1 > >> /sys/fs/bcache/311a03a9-3646-40a8-935f-10030ee75b25/tiering_percent ; >> sleep 5 ; umount /mnt/test >> >> Now I'm getting in dmesg: >> Aug 25 11:55:04 localhost kernel: [ 1366.385581] bcache >> (311a03a9-3646-40a8-935f-10030ee75b25): IO error: read only >> Aug 25 11:55:04 localhost kernel: [ 1366.385600] bcache >> (311a03a9-3646-40a8-935f-10030ee75b25): IO error: read only >> Aug 25 11:55:04 localhost kernel: [ 1366.390298] bcache >> (311a03a9-3646-40a8-935f-10030ee75b25): IO error: read only >> Aug 25 11:55:04 localhost kernel: [ 1366.391076] bcache >> (311a03a9-3646-40a8-935f-10030ee75b25): IO error: read only >> Aug 25 11:55:04 localhost kernel: [ 1366.391098] bcache >> (311a03a9-3646-40a8-935f-10030ee75b25): IO error: read only >> Aug 25 11:55:04 localhost kernel: [ 1366.391111] bcache >> (311a03a9-3646-40a8-935f-10030ee75b25): IO error: read only >> Aug 25 11:55:04 localhost kernel: [ 1366.417244] bcache >> (311a03a9-3646-40a8-935f-10030ee75b25): IO error: read only >> Aug 25 11:55:04 localhost kernel: [ 1366.656319] bcache >> (311a03a9-3646-40a8-935f-10030ee75b25): stopped >> >> Now: >> # mount -o noatime -t bcache /dev/system10/bcache:/dev/sdd1 /mnt/test >> # md5sum /mnt/test/randomdata >> a7d2712c673d891d9ba50f2f7157c091 /mnt/test/randomdata >> >> So it is ok. But logs in dmesg are a little scary. >> I had data corruption in similar situation like this but I can't >> reproduce it. >> Btw, should be bcachefs immune of power reset while IO activity? > > Yes, it definitely should be. > > Do id you see in the log what caused it to go RO? Or did you do that via sysfs? I changed state via sysfs only. >> >> 2. Unsuccessful try of unregister device: >> # echo 1 > >> /sys/fs/bcache/311a03a9-3646-40a8-935f-10030ee75b25/cache1/unregister >> >> and console hangs. I have acces to files from other console. >> In dmesg is: >> Aug 25 12:07:48 localhost kernel: [ 2130.432099] INFO: task bash:19379 >> blocked for more than 30 seconds. >> Aug 25 12:07:48 localhost kernel: [ 2130.432105] Tainted: P >> O 4.7.0-bcache+ #5 >> Aug 25 12:07:48 localhost kernel: [ 2130.432108] "echo 0 > >> /proc/sys/kernel/hung_task_timeout_secs" disables this message. >> Aug 25 12:07:48 localhost kernel: [ 2130.432111] bash D >> ffff88014857bc88 0 19379 19376 0x00000000 >> Aug 25 12:07:48 localhost kernel: [ 2130.432118] ffff88014857bc88 >> 0000000000000000 ffff88014a1a1b40 ffff8800c8f78000 >> Aug 25 12:07:48 localhost kernel: [ 2130.432124] ffff88014857bcb0 >> ffff88014857c000 ffffffffc0785244 ffff8800c8f78000 >> Aug 25 12:07:48 localhost kernel: [ 2130.432129] 00000000ffffffff >> ffffffffc0785248 ffff88014857bca0 ffffffff8156fcea >> Aug 25 12:07:48 localhost kernel: [ 2130.432135] Call Trace: >> Aug 25 12:07:48 localhost kernel: [ 2130.432147] [<ffffffff8156fcea>] >> schedule+0x3a/0x90 >> Aug 25 12:07:48 localhost kernel: [ 2130.432152] [<ffffffff81570163>] >> schedule_preempt_disabled+0x13/0x20 >> Aug 25 12:07:48 localhost kernel: [ 2130.432155] [<ffffffff81571c3b>] >> __mutex_lock_slowpath+0x9b/0x140 >> Aug 25 12:07:48 localhost kernel: [ 2130.432159] [<ffffffff81571cf2>] >> mutex_lock+0x12/0x30 >> Aug 25 12:07:48 localhost kernel: [ 2130.432202] [<ffffffffc075f8be>] >> bch_cache_remove+0x1e/0xe0 [bcache] >> Aug 25 12:07:48 localhost kernel: [ 2130.432218] [<ffffffffc0762605>] >> __bch_cache_store+0x245/0x650 [bcache] >> Aug 25 12:07:48 localhost kernel: [ 2130.432234] [<ffffffffc0762a44>] >> bch_cache_store+0x34/0x50 [bcache] >> Aug 25 12:07:48 localhost kernel: [ 2130.432238] [<ffffffff81206272>] >> sysfs_kf_write+0x32/0x40 >> Aug 25 12:07:48 localhost kernel: [ 2130.432240] [<ffffffff812057f3>] >> kernfs_fop_write+0x113/0x190 >> Aug 25 12:07:48 localhost kernel: [ 2130.432243] [<ffffffff8118e5c2>] >> __vfs_write+0x32/0x150 >> Aug 25 12:07:48 localhost kernel: [ 2130.432247] [<ffffffff812e8a33>] ? >> __this_cpu_preempt_check+0x13/0x20 >> Aug 25 12:07:48 localhost kernel: [ 2130.432251] [<ffffffff8109f201>] ? >> update_fast_ctr+0x41/0x70 >> Aug 25 12:07:48 localhost kernel: [ 2130.432253] [<ffffffff8109f262>] ? >> percpu_down_read+0x12/0x50 >> Aug 25 12:07:48 localhost kernel: [ 2130.432256] [<ffffffff8118f8c3>] >> vfs_write+0xb3/0x1b0 >> Aug 25 12:07:48 localhost kernel: [ 2130.432258] [<ffffffff81190ce0>] >> SyS_write+0x50/0xc0 >> Aug 25 12:07:48 localhost kernel: [ 2130.432261] [<ffffffff811adbde>] ? >> __close_fd+0x9e/0xc0 >> Aug 25 12:07:48 localhost kernel: [ 2130.432264] [<ffffffff8157431f>] >> entry_SYSCALL_64_fastpath+0x17/0x93 >> >> >> >> iostat show: >> # iostat -d 1 3 /dev/sdd1 /dev/mapper/system10-bcache >> Linux 4.7.0-bcache+ (marcinm) 25.08.2016 _x86_64_ (4 CPU) >> >> Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn >> sdd1 0,90 2,40 56,36 5920 138772 >> dm-14 21,32 919,34 423,55 2263587 1042859 >> >> Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn >> sdd1 1,00 0,00 64,00 0 64 >> dm-14 2,00 64,00 0,50 64 0 >> >> Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn >> sdd1 1,00 0,00 64,00 0 64 >> dm-14 2,00 64,00 0,50 64 0 > -- To unsubscribe from this list: send the line "unsubscribe linux-bcache" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
