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Re: [Xen-devel] megasas stops I/O when running kernel as dom0 under xen4.1/4.2

I've now reproduced this on a Dell R905 (16 cores, 265GB) which also has a 
MegaRAID SAS 1078,


INFO: task kjournald:1691 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kjournald     D 00003b87     0  1691      2 0x00000000
 eac3fed4 00000246 e92f92b8 00003b87 00000001 00000000 c16cc580 eac3fe74
 7ea17f6b 00003b72 ebd2b954 ebd2b844 ebd2b7b0 ebd2b954 c16cc100 00000001
 d3aad740 c0122a72 c16cc138 0002a01a 00000000 00000005 01038103 00008888
Call Trace:
 [<c0122a72>] ? update_curr+0x72/0xf0
 [<c0142d4c>] ? prepare_to_wait+0x4c/0x60
 [<ed9af3dc>] journal_commit_transaction+0x12c/0x1060 [jbd]
 [<c0382a69>] ? schedule+0x2e9/0x970
 [<c0142b10>] ? autoremove_wake_function+0x0/0x50
 [<c0138234>] ? try_to_del_timer_sync+0x54/0x80
 [<ed9b31e0>] kjournald+0xc0/0x240 [jbd]
 [<c0142b10>] ? autoremove_wake_function+0x0/0x50
 [<ed9b3120>] ? kjournald+0x0/0x240 [jbd]
 [<c0142854>] kthread+0x74/0x80
 [<c01427e0>] ? kthread+0x0/0x80
 [<c010483b>] kernel_thread_helper+0x7/0x10


sd 0:2:0:0: [sda] megasas: RESET -46318 cmd=2a retries=0
megaraid_sas: HBA reset handler invoked without an internal reset condition.
megaraid_sas: no more pending commands remain after reset handling.
megasas: reset successful

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