[superh-gnu-discuss] Problems with gdbserver

[Phil Edworthy]

Hi Paul,

> -----Original Message-----
> From: Paul Mundt [mailto:lethal at linux-sh.org]
> Sent: 30 September 2010 17:46
> To: Phil Edworthy
> Cc: superh-gnu-discuss at codesourcery.com
> Subject: Re: [superh-gnu-discuss] Problems with gdbserver
> 
> On Thu, Sep 30, 2010 at 04:35:55PM +0100, Phil Edworthy wrote:
> > Unable to handle kernel NULL pointer dereference at virtual address
> 00000084
> > pc = 88004260
> > *pde = 8f197000
> > Oops: 0001 [#18]
> > last sysfs file: /sys/class/vc/vcs3/dev
> > Modules linked in:
> >
> > Pid : 607, Comm:                gdbserver
> > CPU : 0                 Tainted: G      D      (2.6.35 #1)
> >
> > PC  : 88004260 SP  : 8f1e1f88 SR  : 40008100 TEA : 296608c0
> > R0  : 00000000 R1  : 00000000 R2  : 00000000 R3  : fffffffc
> > R4  : 8f0676c0 R5  : 00000006 R6  : 00000084 R7  : 00000000
> > R8  : 8f0676c0 R9  : 00000006 R10 : 00000000 R11 : 000000e0
> > R12 : 00000000 R13 : 00000004 R14 : 7bf21a40
> > MACH: 00000004 MACL: 5c405562 GBR : 296f5470 PR  : 8801dabc
> >
> > Call trace:
> >  [<8801dabc>] 0x8801dabc
> >  [<8800725a>] 0x8800725a
> >  [<8801da20>] 0x8801da20
> >
> Can you attach your System.map for this kernel? What does addr2line
> report for the PC?

Only after I sent this was it pointed out to me that the null ptr is being
picked up in the kernel.

System.map attached.

$ sh-linux-gnu-addr2line -f -e vmlinux 88004260
arch_ptrace
??:0

The call trace corresponds to:
0x8801dabc  sys_ptrace    ??:0
0x8800725a  syscall_call  probe.c:0
0x8801da20  sys_ptrace    ??:0

Thanks
Phil
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