Description of problem:

During an VNC installation on a virt guest, the installer appeared to hang while installing the bootloader.  Closer inspection on the console shows a kernel NULL pointer dereference.

Version-Release number of selected component (if applicable):

 * anaconda-13.23
 * kernel-2.6.33-0.23.rc5.git1.fc13.x86_64

How reproducible:
 * This is the first time out of 8 or more installs

Steps to Reproduce:
1. Perform an installation against http://alt.fedoraproject.org/pub/alt/stage/rawhide-testing/
  
Actual results:

Running anaconda 13.23, the Fedora system installer - please wait.             
21:09:16 Starting VNC...
21:09:17 The VNC server is now running.
21:09:17 

WARNING!!! VNC server running with NO PASSWORD!
You can use the vncpassword=<password> boot option
if you would like to secure the server.


21:09:17 Please manually connect your vnc client to test1200.test.redhat.com:1 (10.10.10.200) to begin the install.
Press <enter> for a shell
21:09:18 Starting graphical installation.

sh-4.1# BUG: unable to handle kernel NULL pointer dereference at 0000000000000358
IP: [<ffffffffa010846b>] sym_int_sir+0x646/0x1549 [sym53c8xx]
PGD 2b2ef067 PUD 3eea2067 PMD 0 
Oops: 0000 [#1] SMP 
last sysfs file: /sys/devices/pci0000:00/0000:00:04.0/host2/target2:0:0/2:0:0:0/block/sda/removable
CPU 0 
Pid: 0, comm: swapper Not tainted 2.6.33-0.23.rc5.git1.fc13.x86_64 #1 /
RIP: 0010:[<ffffffffa010846b>]  [<ffffffffa010846b>] sym_int_sir+0x646/0x1549 [sym53c8xx]
RSP: 0018:ffff880003c039b0  EFLAGS: 00010087
RAX: 000000000000000a RBX: ffff88003e41c000 RCX: 0000000000000070
RDX: 0000000000000000 RSI: ffffffffa0103c22 RDI: ffffc90000a5a006
RBP: ffff880003c03a30 R08: ffffffff81a4b830 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88003e41c090 R14: ffff88003e6a800b R15: 0000000000000084
FS:  0000000000000000(0000) GS:ffff880003c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000358 CR3: 000000002b2ec000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process swapper (pid: 0, threadinfo ffffffff81a00000, task ffffffff81a4b020)
Stack:
 0000000000000000 0000000000000002 ffffffff81a4b020 0000000000000000
<0> 0000000000000000 0000000000000000 0000000000000000 0000000000000046
<0> 0000000000000000 0000000000000000 ffff880003c03a60 ffff88003e41c000
Call Trace:
 <IRQ> 
 [<ffffffffa010980c>] sym_interrupt+0x49e/0x6d2 [sym53c8xx]
 [<ffffffffa0103c2a>] sym53c8xx_intr+0x4d/0x7b [sym53c8xx]
 [<ffffffff810abec8>] handle_IRQ_event+0x53/0x119
 [<ffffffff810add95>] handle_fasteoi_irq+0x90/0xd0
 [<ffffffff8100c437>] handle_irq+0x88/0x91
 [<ffffffff8147ca74>] do_IRQ+0x5c/0xc3
 [<ffffffff81477b13>] ret_from_intr+0x0/0x16
 [<ffffffff814778d6>] ? _raw_spin_unlock_irqrestore+0x4c/0x56
 [<ffffffff812fb08f>] ? spin_unlock_irqrestore+0xe/0x10
 [<ffffffff812fbb16>] ? scsi_dispatch_cmd+0x1c1/0x234
 [<ffffffff81301b81>] ? scsi_request_fn+0x476/0x4a3
 [<ffffffff812152ed>] ? __blk_run_queue+0x45/0x74
 [<ffffffff812153d1>] ? blk_run_queue+0x26/0x3a
 [<ffffffff81300ff4>] ? scsi_run_queue+0x300/0x3ac
 [<ffffffff812e8964>] ? put_device+0x17/0x19
 [<ffffffff81301ddc>] ? scsi_next_command+0x3b/0x4b
 [<ffffffff813027cb>] ? scsi_io_completion+0x1f7/0x448
 [<ffffffff81300c43>] ? spin_unlock_irqrestore+0xe/0x10
 [<ffffffff812fb834>] ? scsi_finish_command+0xf5/0xfe
 [<ffffffff81302b42>] ? scsi_softirq_done+0x111/0x11a
 [<ffffffff8121a69a>] ? blk_done_softirq+0x82/0x92
 [<ffffffff810567e4>] ? __do_softirq+0xf8/0x1cd
 [<ffffffff8100ab9c>] ? call_softirq+0x1c/0x30
 [<ffffffff8100c357>] ? do_softirq+0x4b/0xa3
 [<ffffffff810563cf>] ? irq_exit+0x4a/0x8c
 [<ffffffff8147cac4>] ? do_IRQ+0xac/0xc3
 [<ffffffff81477b13>] ? ret_from_intr+0x0/0x16
 <EOI> 
 [<ffffffff81029289>] ? native_safe_halt+0xb/0xd
 [<ffffffff8107d04f>] ? trace_hardirqs_on+0xd/0xf
 [<ffffffff810115f5>] ? default_idle+0x3b/0x5d
 [<ffffffff81008bfc>] ? cpu_idle+0xaf/0xe9
 [<ffffffff8145ed6a>] ? rest_init+0x7e/0x80
 [<ffffffff81d82e2f>] ? start_kernel+0x440/0x44b
 [<ffffffff81d822bc>] ? x86_64_start_reservations+0xa7/0xab
 [<ffffffff81d823b8>] ? x86_64_start_kernel+0xf8/0x107
Code: b2 d5 10 a0 48 89 da eb 65 48 8b 9f b0 01 00 00 48 81 c7 a0 01 00 00 e8 68 02 1e e1 48 c7 c7 ec d5 10 a0 48 89 c6 48 89 da eb 6f <49> 8b 84 24 58 03 00 00 48 8b 90 80 00 00 00 48 8b 38 4c 8b a2 
RIP  [<ffffffffa010846b>] sym_int_sir+0x646/0x1549 [sym53c8xx]
 RSP <ffff880003c039b0>
CR2: 0000000000000358
---[ end trace f535af648735afc9 ]---
Kernel panic - not syncing: Fatal exception in interrupt
Pid: 0, comm: swapper Tainted: G      D    2.6.33-0.23.rc5.git1.fc13.x86_64 #1
Call Trace:
 <IRQ>  [<ffffffff81474628>] panic+0x7a/0x142
 [<ffffffff81478b03>] oops_end+0xb7/0xc7
 [<ffffffff8102f869>] no_context+0x1fc/0x20b
 [<ffffffff81029d1a>] ? pvclock_clocksource_read+0x47/0x83
 [<ffffffff8102fa0a>] __bad_area_nosemaphore+0x192/0x1b5
 [<ffffffff81029237>] ? kvm_clock_read+0x21/0x23
 [<ffffffff8102fa40>] bad_area_nosemaphore+0x13/0x15
 [<ffffffff8147a60b>] do_page_fault+0x16f/0x2df
 [<ffffffff81477e75>] page_fault+0x25/0x30
 [<ffffffffa0103c22>] ? sym53c8xx_intr+0x45/0x7b [sym53c8xx]
 [<ffffffffa010846b>] ? sym_int_sir+0x646/0x1549 [sym53c8xx]
 [<ffffffffa010980c>] sym_interrupt+0x49e/0x6d2 [sym53c8xx]
 [<ffffffffa0103c2a>] sym53c8xx_intr+0x4d/0x7b [sym53c8xx]
 [<ffffffff810abec8>] handle_IRQ_event+0x53/0x119
 [<ffffffff810add95>] handle_fasteoi_irq+0x90/0xd0
 [<ffffffff8100c437>] handle_irq+0x88/0x91
 [<ffffffff8147ca74>] do_IRQ+0x5c/0xc3
 [<ffffffff81477b13>] ret_from_intr+0x0/0x16
 [<ffffffff814778d6>] ? _raw_spin_unlock_irqrestore+0x4c/0x56
 [<ffffffff812fb08f>] ? spin_unlock_irqrestore+0xe/0x10
 [<ffffffff812fbb16>] ? scsi_dispatch_cmd+0x1c1/0x234
 [<ffffffff81301b81>] ? scsi_request_fn+0x476/0x4a3
 [<ffffffff812152ed>] ? __blk_run_queue+0x45/0x74
 [<ffffffff812153d1>] ? blk_run_queue+0x26/0x3a
 [<ffffffff81300ff4>] ? scsi_run_queue+0x300/0x3ac
 [<ffffffff812e8964>] ? put_device+0x17/0x19
 [<ffffffff81301ddc>] ? scsi_next_command+0x3b/0x4b
 [<ffffffff813027cb>] ? scsi_io_completion+0x1f7/0x448
 [<ffffffff81300c43>] ? spin_unlock_irqrestore+0xe/0x10
 [<ffffffff812fb834>] ? scsi_finish_command+0xf5/0xfe
 [<ffffffff81302b42>] ? scsi_softirq_done+0x111/0x11a
 [<ffffffff8121a69a>] ? blk_done_softirq+0x82/0x92
 [<ffffffff810567e4>] ? __do_softirq+0xf8/0x1cd
 [<ffffffff8100ab9c>] ? call_softirq+0x1c/0x30
 [<ffffffff8100c357>] ? do_softirq+0x4b/0xa3
 [<ffffffff810563cf>] ? irq_exit+0x4a/0x8c
 [<ffffffff8147cac4>] ? do_IRQ+0xac/0xc3
 [<ffffffff81477b13>] ? ret_from_intr+0x0/0x16
 <EOI>  [<ffffffff81029289>] ? native_safe_halt+0xb/0xd
 [<ffffffff8107d04f>] ? trace_hardirqs_on+0xd/0xf
 [<ffffffff810115f5>] ? default_idle+0x3b/0x5d
 [<ffffffff81008bfc>] ? cpu_idle+0xaf/0xe9
 [<ffffffff8145ed6a>] ? rest_init+0x7e/0x80
 [<ffffffff81d82e2f>] ? start_kernel+0x440/0x44b
 [<ffffffff81d822bc>] ? x86_64_start_reservations+0xa7/0xab
 [<ffffffff81d823b8>] ? x86_64_start_kernel+0xf8/0x107


Expected results:

No kernel oops