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From: "patrick at parcs dot ath.cx" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug breakpoints/18063] New: Buggy behavior after single-stepping
 into inferior's SIGWINCH handler
Date: Sat, 28 Feb 2015 15:39:00 -0000
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X-Bugzilla-Product: gdb
X-Bugzilla-Component: breakpoints
X-Bugzilla-Version: HEAD
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X-Bugzilla-Priority: P2
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https://sourceware.org/bugzilla/show_bug.cgi?id=18063

            Bug ID: 18063
           Summary: Buggy behavior after single-stepping into inferior's
                    SIGWINCH handler
           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

GDB seems to malfunction after catching a SIGWINCH signal and stepping into the
program's SIGWINCH handler.  In particular GDB seems to catch an endless stream
of SIGTRAPs when attempting to exit the SIGWINCH handler.  This behavior can be
seen when debugging GDB with GDB:

$ gdb gdb
(gdb) catch signal SIGWINCH
Catchpoint 1 (signal SIGWINCH)
(gdb) run
Starting program: /scratchpad/binutils-gdb-build/gdb/gdb 
(gdb) <resize terminal>
Catchpoint 1 (signal SIGWINCH), 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.
rl_sigwinch_handler (sig=28) at
/home/patrick/code/binutils-gdb/readline/signals.c:246
246     {
(gdb) next
259       RL_SETSTATE(RL_STATE_SIGHANDLER);
(gdb) finish
Run till exit from #0  rl_sigwinch_handler (sig=28) at
/home/patrick/code/binutils-gdb/readline/signals.c:246

Program received signal SIGTRAP, Trace/breakpoint trap.
rl_sigwinch_handler (sig=28) at
/home/patrick/code/binutils-gdb/readline/signals.c:260
260       rl_resize_terminal ();
(gdb) finish
Run till exit from #0  rl_sigwinch_handler (sig=28) at
/home/patrick/code/binutils-gdb/readline/signals.c:260

Program received signal SIGTRAP, Trace/breakpoint trap.
rl_resize_terminal () at
/home/patrick/code/binutils-gdb/readline/terminal.c:364
364     {
(gdb) <ad infinitum..>

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