[Bug 249964] [NEW] aacraid driver stalls on high-load SMP machines

[Matthias Urlichs]

Public bug reported:

Under load, this happens rather often:

Jul 18 22:55:24 nun kernel: [86674.467410] aacraid: Host adapter abort request (0,0,2,0)
Jul 18 22:55:24 nun kernel: [86674.467487] aacraid: Host adapter abort request (0,0,3,0)
Jul 18 22:55:24 nun kernel: [86674.467617] aacraid: Host adapter reset request. SCSI hang ?
Jul 18 22:57:26 nun kernel: [86815.728423] aacraid: Host adapter abort request (0,0,0,0)
Jul 18 22:57:26 nun kernel: [86815.728500] aacraid: Host adapter abort request (0,0,3,0)
Jul 18 22:57:26 nun kernel: [86815.728573] aacraid: Host adapter abort request (0,0,2,0)
Jul 18 22:57:26 nun kernel: [86815.728640] aacraid: Host adapter abort request (0,0,1,0)
Jul 18 22:57:26 nun kernel: [86815.728772] aacraid: Host adapter reset request. SCSI hang ?

Access to the storage thus stalls for ten seconds or so.

I have successfully worked around the problem by using "schedtool -a 1
pid-of-basically-everything", so it seems to be an SMP-related problem.

However, one CPU is _somewhat_ slower than four, which is quite
noticeable, so we'd like to get this handled somehow :-/


lspci:

05:06.0 SCSI storage controller: Adaptec RAID subsystem HBA (rev 01)
	Subsystem: Dell PowerEdge 2400,2500,2550,4400
	Flags: bus master, 66MHz, medium devsel, latency 32, IRQ 7
	BIST result: 00
	I/O ports at cc00 [size=256]
	Memory at fccff000 (64-bit, non-prefetchable) [size=4K]
	Expansion ROM at fcd00000 [disabled] [size=128K]
	Capabilities: [dc] Power Management version 2

05:06.1 SCSI storage controller: Adaptec RAID subsystem HBA (rev 01)
	Subsystem: Dell PowerEdge 2400,2500,2550,4400
	Flags: bus master, 66MHz, medium devsel, latency 32, IRQ 11
	BIST result: 00
	I/O ports at c800 [size=256]
	Memory at fccfe000 (64-bit, non-prefetchable) [size=4K]
	Expansion ROM at f8100000 [disabled] [size=128K]
	Capabilities: [dc] Power Management version 2


lspci -n:
05:06.0 0100: 9005:00c5 (rev 01)
	Subsystem: 1028:00c5
	Flags: bus master, 66MHz, medium devsel, latency 32, IRQ 7
	BIST result: 00
	I/O ports at cc00 [size=256]
	Memory at fccff000 (64-bit, non-prefetchable) [size=4K]
	Expansion ROM at fcd00000 [disabled] [size=128K]
	Capabilities: [dc] Power Management version 2

05:06.1 0100: 9005:00c5 (rev 01)
	Subsystem: 1028:00c5
	Flags: bus master, 66MHz, medium devsel, latency 32, IRQ 11
	BIST result: 00
	I/O ports at c800 [size=256]
	Memory at fccfe000 (64-bit, non-prefetchable) [size=4K]
	Expansion ROM at f8100000 [disabled] [size=128K]
	Capabilities: [dc] Power Management version 2

** Affects: linux
     Importance: Unknown
         Status: Confirmed

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Bug watch added: Linux Kernel Bug Tracker #11120
   http://bugzilla.kernel.org/show_bug.cgi?id=11120

** Also affects: linux via
   http://bugzilla.kernel.org/show_bug.cgi?id=11120
   Importance: Unknown
       Status: Unknown

-- 
aacraid driver stalls on high-load SMP machines
https://bugs.launchpad.net/bugs/249964
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