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Cause of the ?? in backtrace


Why would one get the following when trying to do a backtrace in GDB...
(gdb) bt
#0  0x403cdcb4 in _int_malloc () from /lib/libc.so.6
#1  0x403cedfc in malloc () from /lib/libc.so.6
#2  0x401c4418 in sqlite3MallocRaw () from /usr/lib/libsqlite3.so.0
#3  0x401c450c in sqlite3StrNDup () from /usr/lib/libsqlite3.so.0
#4  0x401cc070 in sqlite3VdbeChangeP3 () from /usr/lib/libsqlite3.so.0
#5  0x401cc0ac in sqlite3VdbeOp3 () from /usr/lib/libsqlite3.so.0
#6  0x401ac010 in sqlite3CodeSubselect () from /usr/lib/libsqlite3.so.0
#7  0x401ab4b0 in sqlite3ExprCode () from /usr/lib/libsqlite3.so.0
#8  0x401abd00 in sqlite3ExprIfFalse () from /usr/lib/libsqlite3.so.0
#9  0x401d02cc in sqlite3WhereBegin () from /usr/lib/libsqlite3.so.0
#10 0x401bf13c in sqlite3Select () from /usr/lib/libsqlite3.so.0
#11 0x401b6978 in sqlite3Parser () from /usr/lib/libsqlite3.so.0
#12 0x401c12e0 in sqlite3RunParser () from /usr/lib/libsqlite3.so.0
#13 0x47de97e0 in ?? ()        <------------------------------- This
is my problem
Cannot access memory at address 0x30  <------------|
(gdb)


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