Dear,

    Here is my problems,

     Our environmet is:
    OS: hardhat Linux 2.1
    platform: ppc lopec 7410
    uname -r : 2.4.17_mvl21-lopec
   
   When we port the ppp_generic.c(Which is a kernel module), and the program can be executed on host(redhat 7.2). Howerver, when we complied it and runned on ppc lopec7410 (target) by the cross-developemnt enviornment, which can result in the machine down, and when wei return in the beginning of ppp_xmit_process(), the machine is not down but the following massages is printed in the /var/log/massages:

Dec 29 13:52:31 10 kernel: IN ppp_generic.c(ppp_write()):called function ppp_write () 0  times! 
Dec 29 13:52:31 10 kernel: In ppp_geberic.c(ppp_file_write()): the send device kind (pf->kind,1=INTERFACE,2=CHANNEL)is 1 
Dec 29 13:52:31 10 kernel: In ppp_geberic.c(ppp_file_write()):After copy_from_user, the data from pppd to kernel space is : 
Dec 29 13:52:31 10 kernel:  
Dec 29 13:52:31 10 kernel: c0 21 01 01 00 0a 02 06 00 00 00 00  
Dec 29 13:52:31 10 kernel: IN ppp_GENERIC.c :ppp_xmit_process(),into this function  
Dec 29 13:52:31 10 kernel: IN ppp_GENERIC.c :ppp_xmit_process(),ppp->xmit_pending is 0  
Dec 29 13:52:32 10 kernel: Oops: kernel access of bad area, sig: 11 
Dec 29 13:52:32 10 kernel: NIP: C0012F4C XER: 00000000 LR: C0012F34 SP: DF61FE40 REGS: df61fd90 TRAP: 0300    Tainted: P  
Dec 29 13:52:32 10 kernel: MSR: 00001032 EE: 0 PR: 0 FP: 0 ME: 1 IR/DR: 11 
Dec 29 13:52:32 10 kernel: DAR: 00000004, DSISR: 42000000 
Dec 29 13:52:32 10 kernel: TASK = df61e000[102] 'pppd' Last syscall: 142  
Dec 29 13:52:32 10 kernel: last math df61e000 last altivec df61e000 
Dec 29 13:52:32 10 kernel: GPR00: 00001032 DF61FE40 DF61E000 00000001 00009032 000000A5 DFDBEDE4 0001F618  
Dec 29 13:52:32 10 kernel: GPR08: 0000003C 00000000 DF619008 DF619014 84244862 1004BE28 10040000 10040000  
Dec 29 13:52:32 10 kernel: GPR16: 10040000 10040000 10040000 10040000 00009032 DF61FEF8 DF61FE98 0000012C  
Dec 29 13:52:32 10 kernel: GPR24: 00000006 00000000 00000145 DF61FED8 C02B0984 DF61900C DF7A35E0 DF619000  
Dec 29 13:52:32 10 kernel: Call backtrace:  
Dec 29 13:52:32 10 kernel: C0035128 C00516E0 E100379C C0051A28 C0051D30 C0009FD0 C000409C  
Dec 29 13:52:32 10 kernel: 1001CBA8 10005EC0 100059B8 0FE69628 00000000  


How to debug it and correcte it , Plese help me!

Thanks a lot!
-------------------------------------------

 Best Regards
 
 Dr. Jinwu Wei
 
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National Digital Switching System 
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