[screen-devel] [bug #42342] screen hangs irretrievably

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?42342>

                 Summary: screen hangs irretrievably
                 Project: GNU Screen
            Submitted by: None
            Submitted on: Tue 13 May 2014 01:28:04 AM UTC
                Category: Crash/Freeze/Infloop
                Severity: 3 - Normal
                Priority: 5 - Normal
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.2.1
           Fixed Release: None
         Planned Release: None
           Work Required: None

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Details:

I was working in screen, and it stopped responding.  The master SCREEN process
is using 100% of a CPU.

I attached with gdb, the stack trace looks like this:

(gdb) bt
#0  WinProcess (bufpp=0x7fff52363150, lenp=0x7fff52363164) at window.c:326
#1  0x0000000000433cd6 in DoAction (act=<optimized out>, key=0) at
process.c:1837
#2  0x000000000043941c in StuffKey (i=<optimized out>) at process.c:6548
#3  0x000000000042d871 in ProcessInput (
    ibuf=0x7fff52365231
"OA\033OA\033A\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033OA\033"...,
    ilen=<optimized out>) at process.c:848
#4  0x000000000044166d in disp_readev_fn (ev=<optimized out>, data=<optimized
out>)
    at display.c:3510
#5  0x0000000000448550 in sched () at sched.c:237
#6  0x0000000000406b98 in main (ac=0, av=<optimized out>) at screen.c:1475

The problem appears to be that fore->w_inbuf is full:

(gdb) p sizeof(fore->w_inbuf)
$20 = 4096
(gdb) p fore->w_inlen
$21 = 4096
(gdb) p f
$22 = 0

Therefore, no data can be copied into w_inbuf from *bufpp, and the loop at
process.c:1837 never exits.

The only way out is to forcibly kill the screen process, which loses all of my
session state.





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