Message-ID: <CAHtARFFCUp9EXKKvvXFEWhQu++TEce+tLHfJODHUOn2ZdejF+w@mail.gmail.com>
Date:   Tue, 18 Oct 2016 13:26:32 -0700
From:   adam radford <aradford@...il.com>
To:     Harald Dunkel <harald.dunkel@...igo.de>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: 4.6.4, 3w_sas: timeout too small?

>> Oct 16 06:41:33 nasl003b kernel: [4903207.577484] 3w-sas: scsi0: ERROR: (0x06:0x000D): Microcontroller Error: clearing.

Microcontroller Error = FW crashed and will be reset on the next I/O
timeout or ioctl() timeout, whichever happens first.

It could be the iSCSI target code or initiator sent a SCSI CDB not
supported by 3ware 9750 firmware (or malformed CDB), or your 3ware
card is going bad, most likely the later.

>> Oct 16, 2016 06:45:03AM (0x04:0x005E): Cache synchronization completed: unit=0

Cache sync happens after an online controller reset.  Previously
acknowledged write back cache entries are flushed to disk at this
time.

>> The 3ware web interface says the controller was busy to write the cache to disk

It is not the case that the controller was performing some long cache
flush interval, > 60 seconds, such that you would need to adjust any
timeout values in the controller reset sequence code, i.e.
twl_reset_sequence().

-Adam


On Mon, Oct 17, 2016 at 6:09 AM, Harald Dunkel <harald.dunkel@...igo.de> wrote:
> Hi folks,
>
> Question about the reset timeout of the 3w_sas:
>
> For an unknown reason my 3ware 9750 RAID controller became
> unresponsive. kernel.log:
>
> Oct 16 06:30:42 nasl003b kernel: [4902556.775272] 3w-sas: scsi0: AEN: INFO (0x04:0x002B): Verify completed:unit=1.
> Oct 16 06:38:29 nasl003b kernel: [4903023.388357] 3w-sas: scsi0: AEN: INFO (0x04:0x002B): Verify completed:unit=2.
> Oct 16 06:41:33 nasl003b kernel: [4903207.577484] 3w-sas: scsi0: ERROR: (0x06:0x000D): Microcontroller Error: clearing.
> Oct 16 06:42:11 nasl003b kernel: [4903245.701070] TMR Opcode TARGET_WARM_RESET authorization failed for Initiator Node: iqn.2014-01.com.example.ac.srva001
> Oct 16 06:42:11 nasl003b kernel: [4903245.706778] TMR Opcode TARGET_WARM_RESET authorization failed for Initiator Node: iqn.2014-01.com.example.ac.srva001
> Oct 16 06:42:15 nasl003b kernel: [4903249.298778] TMR Opcode TARGET_WARM_RESET authorization failed for Initiator Node: iqn.2014-01.com.example.ac.srva002
> Oct 16 06:42:15 nasl003b kernel: [4903249.304369] TMR Opcode TARGET_WARM_RESET authorization failed for Initiator Node: iqn.2014-01.com.example.ac.srva002
> Oct 16 06:42:15 nasl003b kernel: [4903249.318734] TMR Opcode TARGET_WARM_RESET authorization failed for Initiator Node: iqn.2014-01.com.example.ac.srva003
> Oct 16 06:42:15 nasl003b kernel: [4903249.324122] TMR Opcode TARGET_WARM_RESET authorization failed for Initiator Node: iqn.2014-01.com.example.ac.srva003
> Oct 16 06:42:41 nasl003b kernel: [4903275.739327] 3w-sas: scsi0: WARNING: (0x06:0x0006): Character ioctl (0x108) timed out, resetting card.
> Oct 16 06:42:41 nasl003b kernel: [4903275.739402] sd 0:0:0:0: WARNING: (0x06:0x002C): Command (0x2a) timed out, resetting card.
> Oct 16 06:43:36 nasl003b kernel: [4903330.757153] iSCSI Login timeout on Network Portal 172.19.96.217:3260
> Oct 16 06:43:36 nasl003b kernel: [4903330.762124] iSCSI Login negotiation failed.
> Oct 16 06:43:42 nasl003b kernel: [4903336.720892] 3w-sas: scsi0: ERROR: (0x06:0x0011): Controller not ready during reset sequence.
> Oct 16 06:43:51 nasl003b kernel: [4903345.796529] iSCSI Login timeout on Network Portal 172.19.96.217:3260
> Oct 16 06:43:51 nasl003b kernel: [4903345.801462] iSCSI Login negotiation failed.
> Oct 16 06:44:06 nasl003b kernel: [4903360.835920] iSCSI Login timeout on Network Portal 172.19.96.217:3260
> Oct 16 06:44:06 nasl003b kernel: [4903360.840843] iSCSI Login negotiation failed.
> Oct 16 06:44:13 nasl003b kernel: [4903367.919662] INFO: task jbd2/sda1-8:235 blocked for more than 120 seconds.
> Oct 16 06:44:13 nasl003b kernel: [4903367.924633]       Tainted: G            E   4.6.0-0.bpo.1-amd64 #1
> Oct 16 06:44:13 nasl003b kernel: [4903367.929624] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> Oct 16 06:44:13 nasl003b kernel: [4903367.934751] jbd2/sda1-8     D ffff88042d896000     0   235      2 0x00000000
> Oct 16 06:44:13 nasl003b kernel: [4903367.934756]  ffff880424c2c440 ffff88042b43a140 ffff8804249e0000 ffff8804249dfbc0
> Oct 16 06:44:13 nasl003b kernel: [4903367.934760]  7fffffffffffffff ffffffff815c50a0 ffff8804249dfc40 ffff8804000daf00
> Oct 16 06:44:13 nasl003b kernel: [4903367.934763]  ffffffff815c4821 0000000000000000 ffffffff815c785f 7fffffffffffffff
> Oct 16 06:44:13 nasl003b kernel: [4903367.934766] Call Trace:
> Oct 16 06:44:13 nasl003b kernel: [4903367.934783]  [<ffffffff815c50a0>] ? bit_wait_timeout+0xa0/0xa0
> Oct 16 06:44:13 nasl003b kernel: [4903367.934786]  [<ffffffff815c4821>] ? schedule+0x31/0x80
> Oct 16 06:44:13 nasl003b kernel: [4903367.934789]  [<ffffffff815c785f>] ? schedule_timeout+0x22f/0x2c0
> Oct 16 06:44:13 nasl003b kernel: [4903367.934794]  [<ffffffff812e55fd>] ? blk_peek_request+0x4d/0x280
> Oct 16 06:44:13 nasl003b kernel: [4903367.934797]  [<ffffffff815c50a0>] ? bit_wait_timeout+0xa0/0xa0
> :
> :
>
> The interesting point is that apparently the reset didn't succeed.
> "Controller not ready during reset sequence" at 06:43:42. The 3ware
> web interface says the controller was busy to write the cache to disk:
>
> Oct 16, 2016 06:45:03AM (0x04:0x005E): Cache synchronization completed: unit=0
>
> I have the impression that the timeout (60 secs?) in the driver is
> insufficient. Do you think the status check in twl_reset_sequence()
> could be improved?
>
> There were no disk failures, of course.
>
>
> Every helpful comment is highly appreciated.
> Harri

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