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crankshaft

Member

Registered: 2013-04-29

Posts: 20

Accessing GPT Hangs system under 3.16, ok on 3.14

Strange, I have connected my DROBO via USB3 (16TB) and under kernel 3.14.21-1-lts when I run gdisk everything is as normal, I can create / delete partitions, mount the disk etc etc.

But under 3.16.4-1-ARCH, as soon as I execute gdisk, the system hangs at the "GPT fdisk (gdisk) version 0.8.10", cannot control C and cannot even be shutdown:

# gdisk /dev/sdb
GPT fdisk (gdisk) version 0.8.10

I also tried this under ubuntu, that also hangs and it appears that only 3.14 works as expected.

I have checked and CONFIG_EFI_PARTITION=y is enabled.

Any suggestions ?

Update
======

I have another 3.14.21-1-lts install, and that also hangs, so it appears that I have only one machine that this works on, how can I find out why ?

Last edited by crankshaft (2014-10-27 23:58:51)

crankshaft

Member

Registered: 2013-04-29

Posts: 20

Re: Accessing GPT Hangs system under 3.16, ok on 3.14

I was hoping that dmesg would provide some insight, and it does show something:

[    3.521587] scsi 3:0:0:0: Direct-Access     Drobo    5D               5.00 PQ: 0 ANSI: 0
[    3.527109] sd 3:0:0:0: [sdb] Very big device. Trying to use READ CAPACITY(16).
[    3.529897] sd 3:0:0:0: [sdb] 34359738368 512-byte logical blocks: (17.5 TB/16.0 TiB)
[    3.534510] sd 3:0:0:0: [sdb] Write Protect is off
[    3.534513] sd 3:0:0:0: [sdb] Mode Sense: 03 00 00 00
[    3.537477] cfg80211: Calling CRDA to update world regulatory domain
[    3.537513] sd 3:0:0:0: [sdb] No Caching mode page found
[    3.537515] sd 3:0:0:0: [sdb] Assuming drive cache: write through
[    3.542267] sd 3:0:0:0: [sdb] Very big device. Trying to use READ CAPACITY(16).
[    3.549263] sd 3:0:0:0: [sdb] No Caching mode page found
[    3.549278] sd 3:0:0:0: [sdb] Assuming drive cache: write through

gdisk /dev/sdb is currently running and hung, cpu usage is 100% but I can't find any other logs that would tell me what is going on !