Re: blktests dm/002 always fails for me

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On Mon, Jun 24, 2024 at 11:21:33AM +0000, Shinichiro Kawasaki wrote:
> I took a look in the test script and dm-dust code again, and now I think the dd
> command is expected to success. The added bad blocks have default wr_fail_cnt
> value 0, then write error should not happen for the dd command. (Bryan, if this
> understanding is wrong, please let me know.)
> 
> So the error log that Christoph observes indicates that the dd command failed,
> and this failure is unexpected. I can not think of any cause of the failure.

Yes, it does indeed fail, this is 002.full with your patch:

dd: error writing '/dev/mapper/dust1': Invalid argument
1+0 records in
0+0 records out
0 bytes copied, 0.000373943 s, 0.0 kB/s

> 
> Christoph, may I ask you to share the kernel messages during the test run?
> Also, I would like to check the dd command output. The one liner patch below
> to the blktests will create resutls/vdb/dm/002.full with the dd output.

the relevant lines of dmesg output below:

[   57.773967] run blktests dm/002 at 2024-06-24 11:43:53
[   57.791251] I/O error, dev vdb, sector 774 op 0x0:(READ) flags 0x80700 phys_seg 250 prio class 0
[   57.791849] I/O error, dev vdb, sector 520 op 0x0:(READ) flags 0x84700 phys_seg 254 prio class 0
[   57.792420] I/O error, dev vdb, sector 520 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
[   57.792805] I/O error, dev vdb, sector 521 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
[   57.793190] I/O error, dev vdb, sector 522 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
[   57.793578] I/O error, dev vdb, sector 523 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
[   57.793955] I/O error, dev vdb, sector 524 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
[   57.794318] I/O error, dev vdb, sector 525 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
[   57.794700] I/O error, dev vdb, sector 526 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
[   57.795130] I/O error, dev vdb, sector 527 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
[   57.795516] Buffer I/O error on dev dm-0, logical block 65, async page read
[   57.800743] device-mapper: dust: dust_add_block: badblock added at block 60 with write fail count 0
[   57.802587] device-mapper: dust: dust_add_block: badblock added at block 67 with write fail count 0
[   57.804359] device-mapper: dust: dust_add_block: badblock added at block 72 with write fail count 0
[   57.811253] device-mapper: dust: dust_add_block: badblock added at block 60 with write fail count 0
[   57.813065] device-mapper: dust: dust_add_block: badblock added at block 67 with write fail count 0
[   57.814786] device-mapper: dust: dust_add_block: badblock added at block 72 with write fail count 0
[   57.818023] device-mapper: dust: enabling read failures on bad sectors
[   57.826500] Buffer I/O error on dev dm-0, logical block 8, async page read




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