CentOS release 5 (Final)
Kernel 2.6.18-8.el5 on an i686

localhost.localdomain login: 
CentOS release 5 (Final)
Kernel 2.6.18-8.el5 on an i686

localhost.localdomain login: BUG: unable to handle kernel NULL pointer dereference at virtual address 0000007f
 printing eip:
f8ab0808
*pde = 77e6e067
Oops: 0000 [#1]
SMP 
last sysfs file: /module/libata/version
Modules linked in: autofs4 hidp xpp_usb(U) xpp(U) wctc4xxp(U) dahdi_transcode(U) wcb4xxp(U) wctdm(U) wcfxo(U) wctdm24xxp(U) wcte11xp(U) wct1xxp(U) wcte12xp(U) wct4xxp(U) dahdi(U) crc_ccitt rfcomm l2cap bluetooth sunrpc ipv6 video sbs i2c_ec button battery asus_acpi ac parport_pc lp parport sg ide_cd cdrom i2c_i801 i2c_core tg3 serio_raw pcspkr dm_snapshot dm_zero dm_mirror dm_mod ata_piix libata sd_mod scsi_mod ext3 jbd ehci_hcd ohci_hcd uhci_hcd
CPU:    1
EIP:    0060:[<f8ab0808>]    Not tainted VLI
EFLAGS: 00010002   (2.6.18-8.el5 #1) 
EIP is at __dahdi_receive_chunk+0x12b/0x1404 [dahdi]
eax: 0000007f   ebx: f605a000   ecx: 00000000   edx: c0738dc8
esi: f605a000   edi: f605a000   ebp: 00000060   esp: c0738d2c
ds: 007b   es: 007b   ss: 0068
Process swapper (pid: 0, ti=c0738000 task=f7d85550 task.ti=f7d89000)
Stack: c0738d94 00000092 c0738dc8 f605a000 00000000 00000000 f605a000 c0738d6c 
       f6f61b80 00000000 00000000 f6024b40 00000000 00000000 f6f683e0 00000008 
       fef8f90c fedc00fc 09580d44 096c07e0 083402c8 04f808b8 09c810e0 05d0067c 
Call Trace:
 [<f8ab6e31>] dahdi_receive+0x65e/0x762 [dahdi]
 [<f8a5a197>] t4_prep_gen2+0x118/0x147 [wct4xxp]
 [<f8a5e0a6>] t4_interrupt_gen2+0x246/0x6dd0 [wct4xxp]
 [<c04db744>] __next_cpu+0x12/0x21
 [<c041c97f>] find_busiest_group+0x177/0x462
 [<c042c854>] do_timer+0x793/0x8a9
 [<c04db744>] __next_cpu+0x12/0x21
 [<c041d3cd>] enqueue_task+0x29/0x39
 [<c041d3f9>] __activate_task+0x1c/0x29
 [<c041dc43>] try_to_wake_up+0x371/0x37b
 [<c0559229>] ata_output_data+0x5e/0x64
 [<c042c98e>] lock_timer_base+0x15/0x2f
 [<c042ce23>] del_timer+0x41/0x47
 [<f88d00ee>] ata_scsi_qc_complete+0x96/0xa1 [libata]
 [<f88cc2d2>] __ata_qc_complete+0x1bf/0x1c6 [libata]
 [<f88cc959>] ata_hsm_qc_complete+0x16a/0x175 [libata]
 [<f88cd193>] ata_hsm_move+0x6a0/0x6b6 [libata]
 [<c055727b>] ide_end_request+0xc7/0xcf
 [<f890611e>] cdrom_pc_intr+0xb0/0x1ec [ide_cd]
 [<c042c98e>] lock_timer_base+0x15/0x2f
 [<c044a2e7>] handle_IRQ_event+0x23/0x49
 [<c044a3a0>] __do_IRQ+0x93/0xe8
 [<c04063f4>] do_IRQ+0x93/0xae
 [<c040492e>] common_interrupt+0x1a/0x20
 [<c0402ccf>] mwait_idle+0x25/0x38
 [<c0402c90>] cpu_idle+0x9f/0xb9
 =======================
Code: a0 08 00 00 b9 07 00 00 00 8b 54 24 08 8a 00 89 d7 47 88 02 f3 aa 31 c9 8b 54 24 08 8b 5c 24 18 01 ca 0f b6 02 03 83 a4 00 00 00 <8a> 00 88 02 0f b6 c0 01 c0 03 83 9c 08 00 00 66 8b 00 66 89 44 
EIP: [<f8ab0808>] __dahdi_receive_chunk+0x12b/0x1404 [dahdi] SS:ESP 0068:c0738d2c
 <0>Kernel panic - not syncing: Fatal exception in interrupt
 BUG: warning at arch/i386/kernel/smp.c:550/smp_call_function() (Not tainted)
 [<c0415af0>] stop_this_cpu+0x0/0x33
 [<c04158df>] smp_call_function+0x57/0xc3
 [<c042417c>] printk+0x18/0x8e
 [<c041595e>] smp_send_stop+0x13/0x1c
 [<c0423757>] panic+0x4c/0x171
 [<c04054dd>] die+0x262/0x296
 [<c05fd66f>] do_page_fault+0x3ea/0x4b8
 [<c05fd285>] do_page_fault+0x0/0x4b8
 [<c0404a71>] error_code+0x39/0x40
 [<f8ab0808>] __dahdi_receive_chunk+0x12b/0x1404 [dahdi]
 [<f8ab6e31>] dahdi_receive+0x65e/0x762 [dahdi]
 [<f8a5a197>] t4_prep_gen2+0x118/0x147 [wct4xxp]
 [<f8a5e0a6>] t4_interrupt_gen2+0x246/0x6dd0 [wct4xxp]
 [<c04db744>] __next_cpu+0x12/0x21
 [<c041c97f>] find_busiest_group+0x177/0x462
 [<c042c854>] do_timer+0x793/0x8a9
 [<c04db744>] __next_cpu+0x12/0x21
 [<c041d3cd>] enqueue_task+0x29/0x39
 [<c041d3f9>] __activate_task+0x1c/0x29
 [<c041dc43>] try_to_wake_up+0x371/0x37b
 [<c0559229>] ata_output_data+0x5e/0x64
 [<c042c98e>] lock_timer_base+0x15/0x2f
 [<c042ce23>] del_timer+0x41/0x47
 [<f88d00ee>] ata_scsi_qc_complete+0x96/0xa1 [libata]
 [<f88cc2d2>] __ata_qc_complete+0x1bf/0x1c6 [libata]
 [<f88cc959>] ata_hsm_qc_complete+0x16a/0x175 [libata]
 [<f88cd193>] ata_hsm_move+0x6a0/0x6b6 [libata]
 [<c055727b>] ide_end_request+0xc7/0xcf
 [<f890611e>] cdrom_pc_intr+0xb0/0x1ec [ide_cd]
 [<c042c98e>] lock_timer_base+0x15/0x2f
 [<c044a2e7>] handle_IRQ_event+0x23/0x49
 [<c044a3a0>] __do_IRQ+0x93/0xe8
 [<c04063f4>] do_IRQ+0x93/0xae
 [<c040492e>] common_interrupt+0x1a/0x20
 [<c0402ccf>] mwait_idle+0x25/0x38
 [<c0402c90>] cpu_idle+0x9f/0xb9
 =======================
BUG: warning at kernel/panic.c:137/panic() (Not tainted)
 [<c0423867>] panic+0x15c/0x171
 [<c04054dd>] die+0x262/0x296
 [<c05fd66f>] do_page_fault+0x3ea/0x4b8
 [<c05fd285>] do_page_fault+0x0/0x4b8
 [<c0404a71>] error_code+0x39/0x40
 [<f8ab0808>] __dahdi_receive_chunk+0x12b/0x1404 [dahdi]
 [<f8ab6e31>] dahdi_receive+0x65e/0x762 [dahdi]
 [<f8a5a197>] t4_prep_gen2+0x118/0x147 [wct4xxp]
 [<f8a5e0a6>] t4_interrupt_gen2+0x246/0x6dd0 [wct4xxp]
 [<c04db744>] __next_cpu+0x12/0x21
 [<c041c97f>] find_busiest_group+0x177/0x462
 [<c042c854>] do_timer+0x793/0x8a9
 [<c04db744>] __next_cpu+0x12/0x21
 [<c041d3cd>] enqueue_task+0x29/0x39
 [<c041d3f9>] __activate_task+0x1c/0x29
 [<c041dc43>] try_to_wake_up+0x371/0x37b
 [<c0559229>] ata_output_data+0x5e/0x64
 [<c042c98e>] lock_timer_base+0x15/0x2f
 [<c042ce23>] del_timer+0x41/0x47
 [<f88d00ee>] ata_scsi_qc_complete+0x96/0xa1 [libata]
 [<f88cc2d2>] __ata_qc_complete+0x1bf/0x1c6 [libata]
 [<f88cc959>] ata_hsm_qc_complete+0x16a/0x175 [libata]
 [<f88cd193>] ata_hsm_move+0x6a0/0x6b6 [libata]
 [<c055727b>] ide_end_request+0xc7/0xcf
 [<f890611e>] cdrom_pc_intr+0xb0/0x1ec [ide_cd]
 [<c042c98e>] lock_timer_base+0x15/0x2f
 [<c044a2e7>] handle_IRQ_event+0x23/0x49
 [<c044a3a0>] __do_IRQ+0x93/0xe8
 [<c04063f4>] do_IRQ+0x93/0xae
 [<c040492e>] common_interrupt+0x1a/0x20
 [<c0402ccf>] mwait_idle+0x25/0x38
 [<c0402c90>] cpu_idle+0x9f/0xb9
 =======================