BUG: workqueue lockup

BUG: workqueue lockup

[Andreas Schwab]

I'm getting this hangup with 4.5 in aranym:

[    2.060000] scsi host0: Atari native SCSI, io_port 0x0, n_io_port 0, base 0x0, irq 15, can_queue 8, cmd_per_lun 1, sg_tablesize 0, this_id 7, flags { }, options { REAL_DMA SUPPORT_TAGS } 
[    2.110000] blk_queue_max_segments: set to minimum 1
[   55.130000] random: nonblocking pool is initialized
[   60.240000] BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 58s!
[   60.270000] BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=-20 stuck for 52s!
[   60.300000] Showing busy workqueues and worker pools:
[   60.310000] workqueue events: flags=0x0
[   60.340000]   pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=2/256
[   60.340000]     pending: cache_reap, do_cache_clean
[   60.380000] workqueue events_power_efficient: flags=0x80
[   60.410000]   pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=2/256
[   60.410000]     pending: fb_flashcursor, neigh_periodic_work
[   60.450000] workqueue kblockd: flags=0x18
[   60.470000]   pwq 1: cpus=0 node=0 flags=0x0 nice=-20 active=1/256
[   60.470000]     pending: blk_mq_timeout_work
[   60.500000] workqueue ncr5380_0: flags=0xa
[   60.530000]   pwq 2: cpus=0 node=0 flags=0x4 nice=0 active=1/1
[   60.530000]     in-flight: 6:NCR5380_main
[   60.560000] pool 2: cpus=0 node=0 flags=0x4 nice=0 hung=58s workers=2 idle: 57

I assume that this has something to do with the ncr5380 updates.

Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

Re: BUG: workqueue lockup

[Michael Schmitz]

Hi Andreas,

that's correct - the driver loops forever, retrying unsuccessful
selection attempts.

Finn had submitted a patch to ARAnyM to rectify that. I have prepared
another patch to the kernel (using presence of the natfeatures driver
to detect we're running on ARAnyM, then skipping all platform device
setup) but haven't submitted that yet.

Cheers,

  Michael


On Mon, Mar 21, 2016 at 4:41 AM, Andreas Schwab <schwab@linux-m68k.org> wrote:
> I'm getting this hangup with 4.5 in aranym:
>
> [    2.060000] scsi host0: Atari native SCSI, io_port 0x0, n_io_port 0, base 0x0, irq 15, can_queue 8, cmd_per_lun 1, sg_tablesize 0, this_id 7, flags { }, options { REAL_DMA SUPPORT_TAGS }
> [    2.110000] blk_queue_max_segments: set to minimum 1
> [   55.130000] random: nonblocking pool is initialized
> [   60.240000] BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 58s!
> [   60.270000] BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=-20 stuck for 52s!
> [   60.300000] Showing busy workqueues and worker pools:
> [   60.310000] workqueue events: flags=0x0
> [   60.340000]   pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=2/256
> [   60.340000]     pending: cache_reap, do_cache_clean
> [   60.380000] workqueue events_power_efficient: flags=0x80
> [   60.410000]   pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=2/256
> [   60.410000]     pending: fb_flashcursor, neigh_periodic_work
> [   60.450000] workqueue kblockd: flags=0x18
> [   60.470000]   pwq 1: cpus=0 node=0 flags=0x0 nice=-20 active=1/256
> [   60.470000]     pending: blk_mq_timeout_work
> [   60.500000] workqueue ncr5380_0: flags=0xa
> [   60.530000]   pwq 2: cpus=0 node=0 flags=0x4 nice=0 active=1/1
> [   60.530000]     in-flight: 6:NCR5380_main
> [   60.560000] pool 2: cpus=0 node=0 flags=0x4 nice=0 hung=58s workers=2 idle: 57
>
> I assume that this has something to do with the ncr5380 updates.
>
> Andreas.
>
> --
> Andreas Schwab, schwab@linux-m68k.org
> GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
> "And now for something completely different."
> --
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Re: BUG: workqueue lockup

[Finn Thain]

On Sun, 20 Mar 2016, Andreas Schwab wrote:

> I'm getting this hangup with 4.5 in aranym:

Are you using this aranym patch?

https://sourceforge.net/p/aranym/bugs/40/

> 
> [    2.060000] scsi host0: Atari native SCSI, io_port 0x0, n_io_port 0, base 0x0, irq 15, can_queue 8, cmd_per_lun 1, sg_tablesize 0, this_id 7, flags { }, options { REAL_DMA SUPPORT_TAGS } 
> [    2.110000] blk_queue_max_segments: set to minimum 1
> [   55.130000] random: nonblocking pool is initialized
> [   60.240000] BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 58s!
> [   60.270000] BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=-20 stuck for 52s!
> [   60.300000] Showing busy workqueues and worker pools:
> [   60.310000] workqueue events: flags=0x0
> [   60.340000]   pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=2/256
> [   60.340000]     pending: cache_reap, do_cache_clean
> [   60.380000] workqueue events_power_efficient: flags=0x80
> [   60.410000]   pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=2/256
> [   60.410000]     pending: fb_flashcursor, neigh_periodic_work
> [   60.450000] workqueue kblockd: flags=0x18
> [   60.470000]   pwq 1: cpus=0 node=0 flags=0x0 nice=-20 active=1/256
> [   60.470000]     pending: blk_mq_timeout_work
> [   60.500000] workqueue ncr5380_0: flags=0xa
> [   60.530000]   pwq 2: cpus=0 node=0 flags=0x4 nice=0 active=1/1
> [   60.530000]     in-flight: 6:NCR5380_main
> [   60.560000] pool 2: cpus=0 node=0 flags=0x4 nice=0 hung=58s workers=2 idle: 57
> 
> I assume that this has something to do with the ncr5380 updates.

It also has to do with the assumption that aranym is the same as an atari.

Aranym doesn't actually implement a 5380 device. Instead it attempts to 
fool the operating system that runs on it. Presumably this is done to 
avoid having to modify existing operating systems.

Does Geert's "initcall_blacklist=atari_scsi_driver_init" workaround help?

-- 

> 
> Andreas.
> 
> 

Re: BUG: workqueue lockup

[Andreas Schwab]

Finn Thain <fthain@telegraphics.com.au> writes:

> On Sun, 20 Mar 2016, Andreas Schwab wrote:
>
>> I'm getting this hangup with 4.5 in aranym:
>
> Are you using this aranym patch?
>
> https://sourceforge.net/p/aranym/bugs/40/

Thanks, I have committed it now.  In future, please send patches to the
aranym mailinglist.

Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."