Kernel Oopsed, but where ?

[Ilya A. Volynets-Evenbakh]

Lev Olshvang wrote:
> Hi list,
>
> I am trying to figure out Oops reason, but I do not understand where
> it happens
>
>
> The system is ARM, linux kernel 2.6.31, No loadable modules
>
> I have 3 questions to following dump :
>
> 1. - PID 1 must be an init process, why it calls himself  a swapper ?
>      (Perhaps it is a kernel thread kswapd)
It is "process swapper", not process "swapper" :)
An address was accessed, swapper attempted to see if there is a page to
be loaded
for this access, and then reported an invalid page fault.
>
> 2. - who is trying to load the failed module - kernel or userspace  (
>     I see that module failed initialization and oopsed in cleanup)
>      The console shows that kernel made most initializations  before oops
Not sure, but looks like kernel is responding to detection of some device.
Can you give more details on your lpg610 module?
> 3. - why no printk from this module is not shown ( I added dozen
> printks to  module init)
Something looks rather messed up, since your init function calls a
cleanup function.
Could it be some sort of stack corruption?
>
>
>
> Here is console messages
> CPU: Testing write buffer coherency: ok
>
> Serial: AMBA PL011 UART driver
> dev:f1: ttyAMA0 at MMIO 0xc6000000 (irq = 0) is a AMBA/PL011
> console [ttyAMA0] enabled
> bio: create slab <bio-0> at 0
> MMC card not detected
> NET: Registered protocol family 2
> IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
> TCP established hash table entries: 1024 (order: 1, 8192 bytes)
> TCP bind hash table entries: 1024 (order: 3, 40960 bytes)
> TCP: Hash tables configured (established 1024 bind 1024)
> TCP reno registered
> NET: Registered protocol family 1
> Unable to handle kernel paging request at virtual address 36677670
> pgd = c0004000
> [36677670] *pgd=00000000
> Internal error: Oops: 0 [#1]
> CPU: 0    Not tainted  (2.6.31 #8)
> PC is at 0x36677670
> LR is at device_get_nodename+0x70/0xdc
> pc : [<36677670>]    lr : [<c01540e4>]    psr: 20000013
> sp : c1c33e30  ip : c1c33e50  fp : c1c33e4c
> r10: c022d744  r9 : 00000001  r8 : 00000000
> r7 : c03c5554  r6 : c1ca5880  r5 : c1c33e54  r4 : c1ca5880
> r3 : 36677670  r2 : 00000004  r1 : c1c33e54  r0 : c1ca5880
> Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment kernel
> Control: 0005317f  Table: 31004000  DAC: 00000017
> Process swapper (pid: 1, stack limit = 0xc1c32270)
> Stack: (0xc1c33e30 to 0xc1c34000)
> 3e20:                                     c1ca5880 c1c47000 c1c19bc0
> c03c5554
> .....
> 3fa0: c001f2e8 c0028a9c 00000040 c03bca48 00000000 00000000 c001befc
> c001c088
> 3fc0: 00000000 00000000 00000000 00000000 c1c33ff4 c1c33fe0 c0008448
> c001f2c0
> 3fe0: 00000000 00000000 00000000 c1c33ff8 c0034df4 c00083c0 b3cc73ac
> 318cb34c
> Backtrace:
> [<c0154074>] (device_get_nodename+0x0/0xdc) from [<c0154260>]
> (dev_uevent+0x110/0x144)
> r7:c03c5554 r6:c1c19bc0 r5:c1c47000 r4:c1ca5880
> [<c0154150>] (dev_uevent+0x0/0x144) from [<c01166fc>]
> (kobject_uevent_env+0x1e4/0x478)
> r5:c1c47000 r4:c1ca5888
> [<c0116518>] (kobject_uevent_env+0x0/0x478) from [<c01169a4>]
> (kobject_uevent+0x14/0x18)
> [<c0116990>] (kobject_uevent+0x0/0x18) from [<c01548b8>]
> (device_del+0x138/0x17c)
> [<c0154780>] (device_del+0x0/0x17c) from [<c0154910>]
> (device_unregister+0x14/0x20)
> r7:00000000 r6:0fe00000 r5:c0257698 r4:c1ca5880
> [<c01548fc>] (device_unregister+0x0/0x20) from [<c0154954>]
> (device_destroy+0x38/0x44)
> r5:c0257698 r4:c1ca5880
> [<c015491c>] (device_destroy+0x0/0x44) from [<c0028a28>]
> (lpg610_cleanup_module+0xd8/0x13c)
> r4:c03cc490
> [<c0028950>] (lpg610_cleanup_module+0x0/0x13c) from [<c0028bf0>]
> (lpg610_init_module+0x164/0x330)
> [<c0028a8c>] (lpg610_init_module+0x0/0x330) from [<c001f2e8>]
> (do_one_initcall+0x38/0x1c4)
>
>
> Thnaks for reading,
> Lev
>
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-- 
Ilya A. Volynets-Evenbakh
http://www.total-knowledge.com