Broken tty handling

Broken tty handling

[David Ford]

Every once in a while I have a very frustrating problem develop.  All tty
handling stops.  Packets flow in and out of the machine fine, but anything
with a tty halts.  I don't know exactly what is happening but I have found
that killing the last user that logged in (all his processes) usually fixes
everything.

It just happened to me and I realize this is vague but there's nothing I
have been able to attribute it to other than a problem in tty handling.  I
know it isn't ssh v.s. telnet v.s. xyz because it doesn't matter, they all
stall.

Here's the data I had.  Aaron was the last person to log in when it broke, I
was the first after it broke.

# grep aaron brokettyspseo
aaron    22843 do_adj -bash
aaron    22865 write_ pine
aaron    23211 do_adj -bash
aaron    23228 tty_wa stty icanon echo
aaron    23277 read_c -bash

# w|grep aaron
.aaron    pts/13  dur-cas1-cs-26.d  9:12pm 26:44   0.14s  0.10s  pine 
.aaron    pts/14  dur-cas1-cs-26.d  9:28pm 15:09   0.01s  0.01s  -bash 
.aaron    pts/15  dur-cas1-cs-26.d  9:29pm 14:26   0.06s  0.06s  -bash 

An 'skill aaron' didn't solve it but 'skill -9 aaron' did.

Here's a snippet from my /etc/profile which the stty from above comes into
play:

# does the user want his titlebar set?
if [ "x$TITLEBAR" = "xyes" ]; then
  echo -ne Checking for titlebar capability
  stty -icanon -echo min 0 time 20
  echo -ne '\033[7n'
  read term_id
  display=$(echo $term_id|sed '/.*:0/!d')
  if [ x$display != x ]; then
    PS1='\[\033]2; ($(date +%l:%M%p)) \u@\h \w\007\033]1;\u@\h\007\]\$ '
  else
    PS1='\h:\w\$ '
  fi
  echo -ne '\033[2K\r'
  stty icanon echo
else
  PS1='\h:\w\$ '
fi


# uname -r
2.4.0-test11

# sed '/C [lL]ibrary /!d; s/[^0-9]*\([0-9.]*\).*/\1/' /lib/libc.so.6
2.1.3

# mount|grep pts
none on /dev/pts type devpts (rw,gid=5,mode=640)


Any suggestions?  Should this be addressed elsewhere?  The reason I bring it
up here is because ALL ttys halt except those on the console.

-d

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Re: Broken tty handling

[Andrew Morton]

David Ford wrote:
> 
> Every once in a while I have a very frustrating problem develop.  All tty
> handling stops.
> ...
> # uname -r
> 2.4.0-test11

Fixed in test13, I suspect.

http://www.uwsg.iu.edu/hypermail/linux/kernel/0012.2/0823.html
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Re: Broken tty handling

[Blu3Viper]

Drat it, don't you hate it when you get around to reporting a long standing
bug and it's already fixed.

Thank you,
-d

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