ncurses 20170401 (+) SEGV gdb 7.12.1 in TUI mode on MinGW-w64

[Allen Hewes]

Hi,

The ncurses 20170401 (onwards) release/snapshot causes SEGV in GDB 7.12.1 in TUI mode on MinGW-w64. I build my own MinGW-w64 toolchains. When I upgrade from 20170325, I get SEGVs from GDB in TUI mode:

gdb --args gdbt --tui
GNU gdb (GDB) 7.12.1
Copyright (C) 2017 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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and "show warranty" for details.
This GDB was configured as "x86_64-w64-mingw32".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
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For help, type "help".
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Reading symbols from gdbt...done.
(gdb) thread apply all bt full
(gdb) run
Starting program: C:\mingw64\bin\gdbt.exe --tui
[New Thread 48316.0xb16c]
[New Thread 48316.0x9cf8]
[New Thread 48316.0xcc68]
[New Thread 48316.0xd24c]

Thread 1 received signal SIGSEGV, Segmentation fault.
0x00007ffcd179cdb8 in strncpy () from C:\WINDOWS\System32\msvcrt.dll
(gdb) bt full
#0  0x00007ffcd179cdb8 in strncpy () from C:\WINDOWS\System32\msvcrt.dll
No symbol table info available.
#1  0x0000000000742037 in set_curterm_sp (address@hidden, address@hidden)
    at ../../../../src/ncurses-6.0-20170401/ncurses/tinfo/lib_cur_term.c:110
        TCB = 0x169e7610
        oldterm = 0x0
#2  0x00000000007436fe in _nc_setupterm_ex (address@hidden, tname=<optimized out>, address@hidden, Filedes=1,
    address@hidden, address@hidden) at ../../../../src/ncurses-6.0-20170401/ncurses/tinfo/lib_setup.c:777
        TCB = 0x169e7610
        termp = 0x169e7610
        code = 0
#3  0x0000000000739ad1 in newterm_sp (sp=<optimized out>, address@hidden, address@hidden <msvcrt!_iob+48>,
    address@hidden <msvcrt!_iob>) at ../../../../src/ncurses-6.0-20170401/ncurses/base/lib_newterm.c:200
        errret = 0
        result = 0x0
        current = 0x0
        its_term = 0x0
        _ofp = 0x7ffcd17cf030 <msvcrt!_iob+48>
        _ifp = 0x7ffcd17cf000 <msvcrt!_iob>
        new_term = 0x169e7610
#4  0x0000000000739eb3 in newterm (address@hidden, ofp=0x7ffcd17cf030 <msvcrt!_iob+48>,
    address@hidden <msvcrt!_iob>) at ../../../../src/ncurses-6.0-20170401/ncurses/base/lib_newterm.c:352
No locals.
#5  0x0000000000476229 in tui_enable () at ../../../../src/gdb-7.12.1/gdb/tui/tui.c:425
        w = <optimized out>
        s = <optimized out>
        interp = <optimized out>
#6  0x000000000046e8e3 in tui_resume (data="" out>) at ../../../../src/gdb-7.12.1/gdb/tui/tui-interp.c:283
        ui = 0x12722810
        stream = 0x12722980
#7  0x000000000054595a in interp_set (interp=0x1698a000, address@hidden)
    at ../../../../src/gdb-7.12.1/gdb/interps.c:253
        ui_interp = <optimized out>
        old_interp = 0x0
        first_time = 1
        buffer = "\005\000\000\000\000\000\000\000\020-r\022\000\000\000\000\000 \230\026\000\000\000\000\177UT", '\000' <repeats 14 times>, "d|Ñü\177\000\000\002\000\000\000\000\000\201\001\000\000\000\000\000\000"
        __PRETTY_FUNCTION__ = "int interp_set(interp*, int)"
#8  0x0000000000545b0b in set_top_level_interpreter (name=0x12722d10 "tui") at ../../../../src/gdb-7.12.1/gdb/interps.c:333
        interp = <optimized out>
#9  0x0000000000546df0 in captured_main (address@hidden) at ../../../../src/gdb-7.12.1/gdb/main.c:968
        context = 0x1270fe20
        argc = <optimized out>
        argv = <optimized out>
        quiet = 0
        set_args = 0
        inhibit_home_gdbinit = 0
        symarg = 0x0
        execarg = 0x0
        pidarg = 0x0
        corearg = 0x0
        pid_or_core_arg = 0x0
        cdarg = 0x0
        ttyarg = 0x0
        print_help = 0
        print_version = 0
        print_configuration = 0
        cmdarg_vec = 0x0
        cmdarg_p = <optimized out>
        dirarg = 0x14e34ee0
        dirsize = <optimized out>
        ndir = 0
        system_gdbinit = 0x1690b070 "c:\\mingw64\\bin\\../etc/gdbinit"
        home_gdbinit = 0x0
        local_gdbinit = 0x0
        i = <optimized out>
        save_auto_load = 350439216
        objfile = <optimized out>
        pre_stat_chain = 0x981660 <sentinel_cleanup>
#10 0x00000000005473b7 in gdb_main (address@hidden) at ../../../../src/gdb-7.12.1/gdb/main.c:1159
No locals.
#11 0x00000000004015e8 in main (argc=2, argv=0x14e34730) at ../../../../src/gdb-7.12.1/gdb/gdb.c:32
        args = {argc = 2, argv = 0x14e34730, interpreter_p = 0x92c030 "console"}

Using the ncurses 20170325 release GDB 7.12.1 TUI mode works fine.

Toolchain I build ncurses with:
mingw-w64 v5 (v5 branch)
binutils 2.28
gcc 6.3.1 (gcc-6-branch)
libsystre 1.0.1

I don't where / how to do more troubleshooting. Any ideas would be great.

Thanks,

/allen

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