[OOPS] -git8,9: NULL pointer dereference in mptspi_dv_renegotiate_work

[Bryce Harrington]

Apologies if this has already been reported; I didn't spot it on the
list.  We've noticed an Oops on AMD64 when running linux-2.6.18-git8 and
-git9, but not -git7:

 mptbase: Initiating ioc0 recovery
 Unable to handle kernel NULL pointer dereference at 0000000000000500 RIP: 
  [<ffffffff80489aa2>] mptspi_dv_renegotiate_work+0xc/0x45
 PGD 0 
 Oops: 0000 [1] PREEMPT SMP 
 CPU 0 
 Modules linked in:
 Pid: 8, comm: events/0 Not tainted 2.6.18-git8 #1
 RIP: 0010:[<ffffffff80489aa2>]  [<ffffffff80489aa2>] mptspi_dv_renegotiate_work+0xc/0x45
 RSP: 0000:ffff81003ec65e40  EFLAGS: 00010282
 RAX: 0000000000000002 RBX: ffff81003e86f640 RCX: 000000000000001e
 RDX: 0000000000000001 RSI: 0000000000000213 RDI: 000000000003e86f
 RBP: 0000000000000500 R08: ffff81003ec64000 R09: ffff81003ed0cf40
 R10: ffff81003e86f640 R11: ffff81003ed0cf40 R12: ffff81003ed0cf40
 R13: 0000000000000213 R14: ffff81003e86f640 R15: ffffffff80489a96
 FS:  0000000000000000(0000) GS:ffffffff80779000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
 CR2: 0000000000000500 CR3: 0000000000201000 CR4: 00000000000006e0
 Process events/0 (pid: 8, threadinfo ffff81003ec64000, task ffff81007f180740)
 Stack:  ffff81003ec65ef8 ffff81003e86f640 ffff81003e86f648 ffffffff8023f1bd
  ffff81003ed0cf40 ffff81003ed0cf40 ffffffff8023f204 ffff8100016dfd70
  00000000fffffffc ffffffff80593ffd 0000000000000000 ffffffff8023f300
 Call Trace:
  [<ffffffff8023f1bd>] run_workqueue+0x9a/0xe1
  [<ffffffff8023f204>] worker_thread+0x0/0x12e
  [<ffffffff8023f300>] worker_thread+0xfc/0x12e
  [<ffffffff80229f62>] default_wake_function+0x0/0xe
  [<ffffffff80229f62>] default_wake_function+0x0/0xe
  [<ffffffff80242433>] kthread+0xc8/0xf1
  [<ffffffff8020a3f8>] child_rip+0xa/0x12
  [<ffffffff8024236b>] kthread+0x0/0xf1
  [<ffffffff8020a3ee>] child_rip+0x0/0x12
 
 
 Code: 48 8b 45 00 31 f6 48 8b b8 50 01 00 00 e8 5c 4d fe ff 48 85 
 RIP  [<ffffffff80489aa2>] mptspi_dv_renegotiate_work+0xc/0x45
  RSP <ffff81003ec65e40>
 CR2: 0000000000000500
  <6>mptbase: Initiating ioc0 recovery

Full console logs showing the above oops are here:
-git7:   ok   http://crucible.osdl.org/runs/2223/sysinfo/amd01.console
-git8:  Oops  http://crucible.osdl.org/runs/2233/sysinfo/amd01.console
-git9:  Oops  http://crucible.osdl.org/runs/2241/sysinfo/amd01.console

Reference information about the machine this is run on:
    http://crucible.osdl.org/runs/2223/sysinfo/amd01.1/

Config files:
-git7:  http://crucible.osdl.org/runs/2223/sysinfo/amd01.config
-git8:  http://crucible.osdl.org/runs/2233/sysinfo/amd01.config

Bryce
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