[Bug breakpoints/18062] New: Infinite loop when single-step out of syscall

["patrick at parcs dot ath.cx" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=18062

            Bug ID: 18062
           Summary: Infinite loop when single-step out of syscall
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: breakpoints
          Assignee: unassigned at sourceware dot org
          Reporter: patrick at parcs dot ath.cx

When the inferior is stopped inside a syscall (e.g. poll), single-stepping out
of this syscall (via "step") causes GDB to loop and to slowly consume more and
more memory.  This can easily be seen when debugging GDB with GDB:

$ gdb gdb
(gdb) run
Starting program: /scratchpad/binutils-gdb-build/gdb/gdb 
(gdb) ^C
Program received signal SIGINT, Interrupt.
0x00007ffff6d784f0 in poll () from /lib/x86_64-linux-gnu/libc.so.6
(gdb) step 
Single stepping until exit from function poll,
which has no line number information.
<infinite loop here>

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