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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