I/O errors without erros from underlying device

[Arkadiusz Miskiewicz <a.miskiewicz@gmail.com>]

Hi.

4.3.0 kernel, raid6 array:

md7 : active raid6 sdg[10] sdad1[9] sdac1[8] sdag1[7] sdaf1[6] sdae1[5] sdaj1[4] sdai1[3] sdah1[2] sdn1[1]
      31255089152 blocks super 1.2 level 6, 512k chunk, algorithm 2 [10/10] [UUUUUUUUUU]
      bitmap: 1/30 pages [4KB], 65536KB chunk

array had weird failure where many disks went into failed state but
remove && adding these disks "fixed" it (turns out not really fixed it).

Unfortunately now some reads fail:

pread(4, 0x1483a00, 4096, 16003680464896) = -1 EIO (Input/output error)

To reproduce used xfs_io
 xfs_io -d -c "pread 16003680464896 4096" /dev/md7
pread64: Input/output error
which does pread exactly as shown above.

write also fails for that area:
xfs_io -d -c "pwrite 16003680464896 4096" /dev/md7
pwrite64: Input/output error

Note that nothing is written in dmesg when that happens.

I've tried various offsets and sizes of pread and at some point that was logged:
[  848.988518] Buffer I/O error on dev md7, logical block 3907148544, async page read

but no error from underlying devices.

List of bad blocks:
http://sprunge.us/XSWI

What can I do now?

(loosing data from that few sectors is acceptable if the rest will be readable)

Thanks,
-- 
Arkadiusz Miśkiewicz, arekm / ( maven.pl | pld-linux.org )
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