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7.2

signal BUS (invalid address aligments) in ....

Asked by lofanabrams in Unix Systems Programming

Tags: address, bad, bus

Need help from the Expert,

I am running out of idea to debug this issue.  Please help!!!

My application run into a BUS error (works on window, solaris 32 bit release version) but get bus error in (solaris 64bits and 32bits debug version).  Why?  It doesn't make any sense to me.  The error occurred in the 3rd party library code and does not compiled with the debug symbol.  

See below error message:

(dbx) step

t@1   (1@1)   signal BUS (invalid address alignment) in AssignUnicodeBuffer at 0xffffffff79221ee4
0xffffffff79221ee4:  AssignUnicodeBuffer+0x01cc:     sth     %14. [%13 + %12]
   t@1   a   1@1   dbx:   bad VDL/DDL:   thread:   Expected  ':event|:curr|:db_syspended|:tid|:addr|:lid|:lrelation|:state|:curfun'   but   got   :rootfun'   ' '
   

Note:    int AssignUnicodeBuffer(( char *) buf, int)  - It takes a char pointer buffer and the lenght of the buffer.
 
For example, if I declared char buf[7] (this example is in window, 32 bit, solaris give me bus signal error)
before this function call, buf=0x0012e834"" - [0]=0, [1]=0......[6]=0 [7]=garbage value
result = AssignUnicodeBuffer( (char*) buf, 7);
 after this function call, buf=0x0012e834"U" - [0]="U", [1]=0, [2]="N", [3]=0, [4]="I", [5]=0, [6]="C", [7]=0, [8]="O", [9]=0, [10]="D", [11]=0, [12]="E", [13]=0,[14]=garbage value

Why it only works on window application?  Do you think I should not typecast char [] to char*?  Is it dangerous to do this kind of type casting in 64bits application?  If it is bits conversion problem, why it also give me bus error in a 32-bit debug version?  but it works on 32-bit release error.   Or can I trust the debugger?  Maybe there is memory problems elsewhere and it just happened the debugger caught in that function?  I run the debugger more than 10 times and it failed in the same code.  

I hope I can hear from you, I really need your help.  Thank you.
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Zone: Unix Systems Programming
Tags: address, bad, bus
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Solution Provided By: ahoffmann
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Solution Grade: B
 
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