Hi Eric,
Am 25.03.2016 um 05:18 schrieb Eric Wheeler:
Please send this output:
tail /sys/block/md2/queue/discard_*
git pull https://bitbucket.org/ewheelerinc/linux v4.5-rc6-bcache-fixes
git pull https://bitbucket.org/ewheelerinc/linux v4.5-rc7-bcache-fixes
Try this patch and see if it BUGs:
> [..]
# tail /sys/block/md2/queue/discard_*
==> /sys/block/md2/queue/discard_granularity <==
4096
==> /sys/block/md2/queue/discard_max_bytes <==
2147450880
==> /sys/block/md2/queue/discard_max_hw_bytes <==
2147450880
==> /sys/block/md2/queue/discard_zeroes_data <==
0
root@gropius:/home/sroesner# echo /dev/md2 > /sys/fs/bcache/register
sroesner@gropius:~$
-> it killed my bash.
Trace with patches and BUG_ON patch:
[ 172.660142] BUG: unable to handle kernel NULL pointer dereference at
0000000000000028
[ 172.660229] IP: [<ffffffff811e53b4>] bio_trim+0xf/0x2a
[ 172.660289] PGD 7faf3e067 PUD 7f9279067 PMD 0
[ 172.660399] Oops: 0000 [#1] SMP
[...]
[ 172.664780] Call Trace:
[ 172.664813] [<ffffffffa007f3be>] ? raid1_make_request+0x2e8/0xad7
[raid1]
[ 172.664846] [<ffffffff811f07da>] ? blk_queue_split+0x377/0x3d4
[ 172.664880] [<ffffffffa005fb5f>] ? md_make_request+0xf6/0x1e9 [md_mod]
[ 172.664912] [<ffffffff811eb860>] ? generic_make_request+0xb5/0x155
[ 172.664947] [<ffffffffa0445c89>] ? prio_io+0x85/0x95 [bcache]
[ 172.664981] [<ffffffffa0448252>] ? register_cache_set+0x355/0x8d0
[bcache]
[ 172.665016] [<ffffffffa04497d3>] ? register_bcache+0x1006/0x1174
[bcache]
See http://pastebin.com/6CHtky2x for complete traces.
Sebastian
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