This is a Mac OS X / GDB counterpart to Truncated Dump pattern previously described for Windows platforms (Volume 1, page 340):
(gdb) info threads Cannot access memory at address 0x7fff885e9e42 4 0x00007fff885e9e42 in ?? () 3 0x00007fff885e9e42 in ?? () 2 0x00007fff885e9e42 in ?? () * 1 0x00007fff885e9e42 in ?? () warning: Couldn't restore frame in current thread, at frame 0 0x00007fff885e9e42 in ?? ()
(gdb) disass 0x00007fff885e9e42 No function contains specified address. (gdb) info r rsp rsp 0x7fff67fe8a18 0x7fff67fe8a18 (gdb) x/100a 0x7fff67fe8a18 0x7fff67fe8a18: Cannot access memory at address 0x7fff67fe8a18
This often happens if there is no space to save a full core dump.