[Wayland-bugs] [Bug 51398] New: [bug] Weston crash when execute "ls" instantly followed "ctrl+shift+c"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=51398

             Bug #: 51398
           Summary: [bug] Weston crash when execute "ls" instantly
                    followed "ctrl+shift+c"
    Classification: Unclassified
           Product: Wayland
           Version: unspecified
          Platform: Other
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: weston
        AssignedTo: wayland-bugs at lists.freedesktop.org
        ReportedBy: shengyanx.zhao at intel.com


System Environment:
--------------------------
Arch:     i386
Libdrm:  (master)libdrm-2.4.35-11-ga1d462d2a6f720538eaf1199a94dd27cd04e8a54 
Wayland: (master)67e16be8aa9408d77dc291d9accb238fb9422c94
Mesa:    (master)2f8351a5ac7bb04482eebaa73d967f7527df4d18
Xserver: (master)
xorg-server-1.12.0-232-g8dc70acbf3d82611ac9ec1ec2a52edcc01934850
Xf86_video_intel: 2.19.0-317-g38f06a351fdd35fa5c6136e9a25e034a812a94c2
Cairo:   (master) dbc0efad7e565558a3abf7f69d7675efddc4688d
Cairo_gl: (master) 35e4ffd91cc73fb17c47a12010f515941d6f4d3d
Xkbcommon: (master) 6992de408a890be7bd66f7d829dc84eb9c4b81a6
Weston:  (master) 8fe8d24902a423cb34e2336321a1b5854793b132
Kernel_unstable: (drm-intel-next-queued)
e3f33d46fd917747e966f8e6d25f2940223ad1ee

Bug detailed description:
-----------------------------
Start weston under drm mode, then run weston-terminal. Click weston-terminal
and type "ls" and "enter". Nearly at the same time, press "ctrl+shift+c", then
weston crash with the following info:
[14:05:20.590]   [000000000804d36a]  --  (./weston)
[14:05:20.590]   [00000000b77d340c]  __kernel_rt_sigreturn  ()
[14:05:20.590]   [0000000008054108]  --  (./weston)
[14:05:20.590]   [00000000080541cf]  --  (./weston)
[14:05:20.590]   [00000000b779122e]  wl_seat_set_selection 
(/opt/X11R7/lib/libw                                                           
                                     ayland-server.so.0)
[14:05:20.590]   [00000000b77912b5]  -- 
(/opt/X11R7/lib/libwayland-server.so.0)
[14:05:20.590]   [0000000046a89447]  ffi_call_SYSV  (/usr/lib/libffi.so.5)
[14:05:20.590]   [0000000046a891c0]  ffi_call  (/usr/lib/libffi.so.5)
[14:05:20.590]   [00000000b77930a3]  -- 
(/opt/X11R7/lib/libwayland-server.so.0)
[14:05:20.590]   [00000000b778ead1]  -- 
(/opt/X11R7/lib/libwayland-server.so.0)
[14:05:20.590]   [00000000b77913c2]  -- 
(/opt/X11R7/lib/libwayland-server.so.0)
[14:05:20.590]   [00000000b7791c0a]  wl_event_loop_dispatch 
(/opt/X11R7/lib/lib                                                            
                                    wayland-server.so.0)
[14:05:20.590]   [00000000b778f9a2]  wl_display_run 
(/opt/X11R7/lib/libwayland-                                                    
                                            server.so.0)
[14:05:20.590]   [000000000804cd9f]  --  (./weston)
[14:05:20.590]   [00000000466373f3]  __libc_start_main  (/lib/libc.so.6)
[14:05:20.590]   [000000000804cedd]  --  (./weston)

ps. 
1. The time interval of two operations "ls+enter" and "ctrl+shift+c" should
within 1 second.
2. This bug can not be reproduced every time, if it doesn't happen, restart
weston. The reproduce rate is more or less 70%.

The bug can only be reproduced under drm mode, With X mode, it is normal.

Reproduce steps:
----------------------------
1. Start weston under drm mode.
2. Start weston-terminal.
3. Click weston-terminal.
4. Type "ls" and "Enter" and instantly press "ctrl+shift+c".

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