Hi,

While running kernbench with the 2.6.23-git8 following oops is produced

Unable to handle kernel NULL pointer dereference at 0000000000000010 RIP: 
 [<ffffffff8033f347>] __rb_rotate_left+0x7/0x70
PGD 31f7ad067 PUD 31f14d067 PMD 0 
Oops: 0000 [1] SMP 
CPU 8 
Modules linked in: loop dm_mod md_mod sg
Pid: 6923, comm: slpd Not tainted 2.6.23-git8-autokern1 #1
RIP: 0010:[<ffffffff8033f347>]  [<ffffffff8033f347>] __rb_rotate_left+0x7/0x70
RSP: 0018:ffff81031d083e90  EFLAGS: 00010086
RAX: ffff8106147550d0 RBX: ffff81033007b650 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff810330080808 RDI: ffff8106147550d0
RBP: ffff8106147550d0 R08: ffff81033007b650 R09: ffff81033007b650
R10: ffff8103300807e0 R11: 0000000000000000 R12: ffff8106147550d0
R13: ffff810330080808 R14: ffff810330080780 R15: 0000000000000008
FS:  00002ab70eae80a0(0000) GS:ffff8106146b5440(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000010 CR3: 000000031d08f000 CR4: 00000000000006e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process slpd (pid: 6923, threadinfo ffff81031d082000, task ffff81031f31f100)
Stack:  ffffffff8033f4aa ffff8106147550c0 ffff81031d083ed0 ffff8103300807e0
 ffff81031f31f300 ffffffff8022bc59 0000000000000008 0000000000000384
 ffff81031d083f70 ffffffff804b6dec ffff81031d61b0c0 0000000000001000
Call Trace:
 [<ffffffff8033f4aa>] rb_insert_color+0x8a/0xf0
 [<ffffffff8022bc59>] put_prev_task_fair+0x49/0x60
 [<ffffffff804b6dec>] schedule+0xec/0x1d1
 [<ffffffff80284685>] vfs_read+0xc5/0x160
 [<ffffffff80284b63>] sys_read+0x53/0x90
 [<ffffffff8020bb78>] sysret_careful+0xd/0x10


Code: 48 8b 51 10 49 83 e0 fc 48 85 d2 48 89 57 08 74 0c 48 8b 02 
RIP  [<ffffffff8033f347>] __rb_rotate_left+0x7/0x70
 RSP <ffff81031d083e90>
CR2: 0000000000000010

-- 
Thanks & Regards,
Kamalesh Babulal,
Linux Technology Center,
IBM, ISTL.