bug#15075: 24.3.50; Infinite loop when closing some connections

[Lars Magne Ingebrigtsen]

Here's another gdb backtrace from when it hangs.  Hm...  Ok, I should
probably re-compile it with -O2.  I'll do that and get another hang.

0  0x00007ffff2f4718d in read () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00000000004e5086 in read (__nbytes=4096, __buf=0x7fffffffb6d0, __fd=21) 
at /usr/include/x86_64-linux-gnu/bits/unistd.h:45
#2  emacs_read (fildes=fildes@entry=21, buf=0x7fffffffb6d0 "221 
hermes.netfonds.no closing connection\r\n", nbyte=4096) at sysdep.c:2300
#3  0x0000000000577820 in read_process_output (proc=proc@entry=85871045, 
channel=21) at process.c:4980
#4  0x000000000057c548 in wait_reading_process_output (time_limit=<optimized 
out>, nsecs=-1, read_kbd=read_kbd@entry=0, 
    do_display=do_display@entry=false, wait_for_cell=11969090, 
wait_proc=0x51e49c0, just_wait_proc=0) at process.c:4435
#5  0x000000000057d541 in Faccept_process_output (process=85871045, 
seconds=<optimized out>, millisec=<optimized out>, 
    just_this_one=<optimized out>) at process.c:3948

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