XWin Server fails to start with keymap failure, strace log attached.

[Jon TURNEY]

On 06/06/2015 16:37, John T. Kerich wrote:
>>> •  Check that /usr/bin/xkbcomp can be run from a bash shell. If that
>>> fails, see if cygcheck /usr/bin/xkbcomp reports any missing DLLs.
>
>> The cygcheck output looks correct.  I assume you also checked that xkbcomp can be run?
> I am not sure what the input file should be see all I see is the error message "Error: No input file specified".  If you know what the path is I will run it and see if it works.

That's fine, it just shows that xkbcomp does exist and can be run.

>> If that doesn't help, perhaps you can run 'strace -o log XWin' and attach the resulting log file?
> Log file attached.  This is what I see in the Cygwin64 terminal.

Thanks.  The interesting bit is:

>     1       1 [main] sh (8156) **********************************************
>    54      55 [main] sh (8156) Program name: C:\cygwin64\bin\sh.exe (windows pid 8156)
>    22      77 [main] sh (8156) OS version:   Windows NT-6.1
>    20      97 [main] sh (8156) **********************************************
>    56     153 [main] sh (8156) sigprocmask: 0 = sigprocmask (0, 0x0, 0x1802E30A8)
>   105     258 [main] sh 8156 child_copy: cygheap - hp 0x5F0 low 0x180303400, high 0x180311008, res 1
>    20     278 [main] sh 8156 child_copy: done
>    54     332 [main] sh 8156 open_shared: name shared.5, n 5, shared 0x180030000 (wanted 0x180030000), h 0x6C, *m 6
>    27     359 [main] sh 8156 user_heap_info::init: heap base 0x600000000, heap top 0x600000000, heap size 0x20000000 (536870912)
>    23     382 [main] sh 8156 open_shared: name (null), n 1, shared 0x180020000 (wanted 0x180020000), h 0x54, *m 6
>    17     399 [main] sh 8156 user_info::create: opening user shared for '' at 0x180020000
>    18     417 [main] sh 8156 user_info::create: user shared version AB1FCCE8
>    34     451 [main] sh (8156) open_shared: name cygpid.8156, n 8156, shared 0x180010000 (wanted 0x180010000), h 0x74, *m 6
>    21     472 [main] sh 8156 time: 1433604545 = time(0x0)
>    19     491 [main] sh 8156 pinfo::thisproc: myself dwProcessId 8156
>    24     515 [main] sh 8156 fhandler_pty_slave::fixup_after_fork: /dev/pty0 inherited, usecount 4
>    19     534 [main] sh 8156 fhandler_pty_slave::fixup_after_fork: /dev/pty0 inherited, usecount 4
>    19     553 [main] sh 8156 fhandler_pty_slave::fixup_after_fork: /dev/pty0 inherited, usecount 4
>    26     579 [main] sh 8156 fhandler_base::fork_fixup: handle 0x324 already opened
>    18     597 [main] sh 8156 fhandler_base::fork_fixup: handle 0x32C already opened
>  2204    2801 [main] sh 8156 wsock_init: res 0
>    50    2851 [main] sh 8156 wsock_init: wVersion 514
>    19    2870 [main] sh 8156 wsock_init: wHighVersion 514
>    17    2887 [main] sh 8156 wsock_init: szDescription WinSock 2.0
>    16    2903 [main] sh 8156 wsock_init: szSystemStatus Running
>    16    2919 [main] sh 8156 wsock_init: iMaxSockets 0
>    16    2935 [main] sh 8156 wsock_init: iMaxUdpDg 0
> --- Process 8156, exception c0000005 at 000000007764DAE1
> 641327 37070714 [main] XWin 13060 child_info::sync: pid 8156, WFMO returned 1, exit_code 0xC000041D, res 0
>    15 37070729 [waitproc] XWin 13060 pinfo::status_exit: *** STATUS_0xC000041D
>   212 37070941 [main] XWin 13060 wait4: calling proc_subproc, pid 8156, options 0
>     1 37070942 [waitproc] XWin 13060 pinfo::maybe_set_exit_code_from_windows: pid 8156, exit value - old 0x0, windows 0xC000041D, cygwin 0x8007F00

This shows that sh is crashing in some DLL early in the attempt to use 
it to run xkbcomp.  I'm not quote sure how this translates to 
termination status 0x7F00.

Unfortunately strace doesn't quite capture enough information to 
identify which DLL.

I've uploaded a patched version which collects more information at [1], 
perhaps you download that, put it in /usr/bin and try that strace 
command again. (You may need to chmod +x it after downloading)

This is suggestive of some other software interfering with Cygwin somehow.

[1] ftp://cygwin.com/pub/cygwinx/x86_64/strace.exe

-- 
Jon TURNEY
Volunteer Cygwin/X X Server maintainer

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