[Haiku-bugs] [Haiku] #3772: Freeze on Haiku tree compilation (reproduceable)

[michael.weirauch]

#3772: Freeze on Haiku tree compilation (reproduceable)
------------------------------+---------------------------------------------
 Reporter:  michael.weirauch  |       Owner:  axeld         
     Type:  bug               |      Status:  new           
 Priority:  normal            |   Milestone:  R1            
Component:  System            |     Version:  R1 development
Blockedby:                    |    Platform:  x86           
 Blocking:                    |  
------------------------------+---------------------------------------------

Comment(by michael.weirauch):

 r30772; ata-stack;

 For reproduction, I wen't on and wrote a little script which dd's 10
 images 100MB each to disk.

 When setting all safe mode options, or just "Disable IDE-DMA" and "Disable
 SMP" I can run the dd writes several times without freeze. What is
 reproduceable is that after the images have been written, the "scsi
 scheduler" kernel thread sucks up one cpu core 100% for about 3-5minutes
 and then reliefs again. During that high load of the thread a "sync" or
 system shutdown is not possible. The UI (Deskbar + ActivityMonitor
 replicants on Desktop) are frozen for a bit of time. The Terminal cursor
 blinks, and I can move windows around.

 When letting SMP enabled, I could produce a total freeze on third run of
 the dd writes. (Mileage on subsequent test might vary I guess, though.)

 Perhaps there is some other fix required as done in r30454 as I do have
 ICH9M running in compat mode? (This rev btw helped a lot regarding uptime
 until freeze for me.)

-- 
Ticket URL: <http://dev.haiku-os.org/ticket/3772#comment:13>
Haiku <http://dev.haiku-os.org>
The Haiku operating system.