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

From: Bryce Harrington
Date: Thu Sep 28 2006 - 16:26:10 EST

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
Oops: 0000 [1] PREEMPT SMP
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:

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

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