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SubjectRe: [Linux-usb-users] PROBLEM: Kernel 2.6.x freeze
On Mon, 02 Oct 2006 23:47:06 +0200
Arkadiusz Jalowiec <ajalowiec@interia.pl> wrote:

> BUG: unable to handle kernel paging request at virtual address 000f9edf
> printing epip
> *pde=00000000
> Ops: 0002 [#1]
> Modules linked in: ppp_deflate zlib_deflate bsd_comp pppoatm ipv6
> partport_pc partport snd_pcm_oss snd_mixer_oss via_agp agpgart uagle_atm
> usbatm uhci_hcd ehci_hcd usbcore i2c_viapro i2c_core snd_via82xx
> snd_ac97.codec snd_ac97_bus snd_pcm snd_timer snd_page_alloc
> snd_mpu_401_uart snd_rawmidi ipt_LOG snd_seq_device snd xt_limit
> soundcore via_rhine mii xt_tcpudp xt_state iptables_filter nls_iso8859-2
> nls_cp852 ip_contract_irc ip_contract_ftp xt_contract ip_contract
> iptables x_tables
> CPU: 0
> EIP: 0060: [<d0d18140>] Not tainted VLI
> EFLAGS: 00010083 (2.6.18 #1)
> EIP is at uhci_result_isochronous+0x4f/0x131 [uhci_hcd]
> eax: 000f9edf ebx: cf7b3600 edx:000f9edf edx:ceedfed0
> esi:cf7b3600 edi:cba5c2a0 epb:ceedfed0 esp:c03adef8
> ds:007b es:007b ss:0068
>
> Process swapper (pid:0,ti=c03ac000 task=c03530a0 task.ti=c03ac000)
> Stack: cf15e3a0 cba5c330 ce2caac0 ceedfed0 cf7b3600 ce2caac0 00000001
> ceedfed0
> d0d185d1 c03adfa4 ceedfed0 cf7b3600 00000001 c03adfa4 d0d1884b 00000246
> 00000000 00000000 ceedfe00 d0d192ad ceedfed0 c03adfa4 ceedfe00 00000000
>
> Call Trace:
> [<d0d185d1>] uhci_scan_qh+0x28/0x174 [uhci_hcd]
> [<d0d18846>] uhci_scan_schedule+0x72/0xec [uhci_hcd]
> [<d0d192ad>] uhci_hcd_irq+0x27/0x4e [usbcore]
> [<c012c4c4>] handle_IRQ_event+0x21/0x47
> [<c012c545>]_do_IRQ+0x5b/0xa2
> [<c0104106>] do_IRQ+0x40/04d
> [<c0102c4a>] common_interrupt+0x1a/0x20
> [<c021dfd1>] acpi_processor_idle+0x1c4/0x2c3
> [<c01010c4>] cpu_idle+0x3f/0x5b
> [<c03ae63b>] start_kernel+0x197/0x199
>
> Code 83 ed 14 39 c2 89 6c 24 04 0f 84 f3 00 00 00 8b 46 3c 8b 54 24 0c
> 3b 42 70 78 0a b8 8d ff ff ff e9 e0 00 00 00 89 c1 8b 6c 24 0c <00> 20
> 7b 0f 00 00 00 00 69 7f e0 ff 00 00 00 00 00 20 7b 0f 14
>
> EIP:[<cd0d18140>] uhci_result_isochronous+0x4f/0x131
> [uhci_hcd] SS:ESP 0068:c03adef8
> <0> Kernel panic - not syncing: Fatal excepition in interrupt
>
> I run "objdump -d drivers/usb/host/uhci-hcd.o" and post the portion of
> the output for: uhci_result_isochronous
>
> 000010f1 <uhci_result_isochronous>:

[CUT]

> 1115: 83 ed 14 sub $0x14,%ebp
> 1118: 39 c2 cmp %eax,%edx
> 111a: 89 6c 24 04 mov %ebp,0x4(%esp)
> 111e: 0f 84 f3 00 00 00 je 1217
> <uhci_result_isochronous+0x126>
> 1124: 8b 46 3c mov 0x3c(%esi),%eax
> 1127: 8b 54 24 0c mov 0xc(%esp),%edx
> 112b: 3b 42 70 cmp 0x70(%edx),%eax
> 112e: 78 0a js 113a
> <uhci_result_isochronous+0x49>
> 1130: b8 8d ff ff ff mov $0xffffff8d,%eax
> 1135: e9 e0 00 00 00 jmp 121a
> <uhci_result_isochronous+0x129>
> 113a: 89 c1 mov %eax,%ecx
> 113c: 8b 6c 24 0c mov 0xc(%esp),%ebp
> 1140: 81 e1 ff 03 00 00 and $0x3ff,%ecx
||
----> EIP points here


> 1146: 8b 45 58 mov 0x58(%ebp),%eax
> 1149: 8b 1c 88 mov (%eax,%ecx,4),%ebx
> 114c: 85 db test %ebx,%ebx
> 114e: 74 35 je 1185
> <uhci_result_isochronous+0x94>
> 1150: 8b 43 24 mov 0x24(%ebx),%eax
> 1153: 8b 55 54 mov 0x54(%ebp),%edx
> 1156: 8b 40 e0 mov 0xffffffe0(%eax),%eax
> 1159: 89 04 8a mov %eax,(%edx,%ecx,4)



The assembly extracted by the dumped code is:

0: 83 ed 14 sub $0x14,%ebp
3: 39 c2 cmp %eax,%edx
5: 89 6c 24 04 mov %ebp,0x4(%esp)
9: 0f 84 f3 00 00 00 je 102 <str+0x102>
f: 8b 46 3c mov 0x3c(%esi),%eax
12: 8b 54 24 0c mov 0xc(%esp),%edx
16: 3b 42 70 cmp 0x70(%edx),%eax
19: 78 0a js 25 <str+0x25>
1b: b8 8d ff ff ff mov $0xffffff8d,%eax
20: e9 e0 00 00 00 jmp 105 <str+0x105>
25: 89 c1 mov %eax,%ecx
27: 8b 6c 24 0c mov 0xc(%esp),%ebp
2b: 00 20 add %ah,(%eax)
||
----> EIP points here

2d: 7b 0f jnp 3e <str+0x3e>
2f: 00 00 add %al,(%eax)
31: 00 00 add %al,(%eax)
33: 69 7f e0 ff 00 00 00 imul $0xff,0xffffffe0(%edi),%edi
3a: 00 00 add %al,(%eax)
3c: 20 7b 0f and %bh,0xf(%ebx)
3f: 14


The code dumped from memory matches the original one up to, and not
including, the failing istruction. From that point the code is
different.

The failure is only a natural consequence of:

add %ah,(%eax)

with "eax" pointing to 000f9edf, that belongs to the BIOS reserved
memory region...


The real problem is that the code starting from "0xcd0d18140" has been
overwritten by something :(


Another thing: both panics happened in interrupt context and both times
uhci driver is involved.


And this is the data that has overwritten the code:

00 20 7b 0f 00 00 00 00 69 7f e0 ff 00 00 00 00 00 20 7b 0f 14
^^^^^^^^^^^ ^^^^^^^^^^^

Maybe someone have an idea of where does this data come from?


To me it looks like a struct with ints / pointers:

{
0x0f7b2000,
NULL,
0xffe07f69,
NULL,
0x0f7b2000,
0x......14
}

Maybe this will ring some bells...

--
Paolo Ornati
Linux 2.6.18 on x86_64
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