Messages in this thread | | | Date | Fri, 13 Jun 2008 19:49:57 -0600 | From | Joe Peterson <> | Subject | Re: 2.6.25.3: su gets stuck for root |
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Vegard Nossum wrote: > I think knowing the pgrps of the above processes (there is possibly > one more involved, stty?) would be useful; try: > > $ ps -eo pid,pgrp,tpgid,user,args
OK, I performed this test again (getting the su to hang), and here is the info:
tty_check_change: current->signal->tty = f7879800 tty_check_change: tty = f7879800 tty_check_change: tty->pgrp = f78639c0 tty->pgrp->count = 5 tty->pgrp->level = 0 tty->pgrp->numbers[0].nr = 7036 tty_check_change: task_pgrp(current) = f7863f00 task_pgrp(current)->count = 1 task_pgrp(current)->level = 0 task_pgrp(current)->numbers[0].nr = 7037 tty_check_change: kill_pgrp called; returning -ERESTARTSYS set_termios: error return value (-512) from tty_check_change
scorpius ~ # ps aux | grep 7036 foo 7036 0.0 0.1 2336 1100 tty1 S+ 19:30 0:00 su foo
scorpius ~ # ps aux | grep 7037 foo 7037 0.0 0.1 2988 1460 tty1 S 19:30 0:00 bash
scorpius ~ # ps -eo pid,pgrp,tpgid,user,args | grep 7036 6902 6902 7036 root /bin/login -- 6922 6922 7036 root -bash 7036 7036 7036 foo su foo 7037 7037 7036 foo bash 7042 7037 7036 foo stty -ixany
scorpius ~ # ps -eo pid,pgrp,tpgid,user,args | grep 7037 7037 7037 7036 foo bash 7042 7037 7036 foo stty -ixany
scorpius ~ # ps aux | grep 7042 foo 7042 0.0 0.0 1608 376 tty1 T 19:30 0:00 stty -ixany
scorpius ~ # ps -eo pid,pgrp,tpgid,user,args | grep 7042 7042 7037 7036 foo stty -ixany
(I omitted, of course, when grep found itself, and I compressed some white space to allow lines to fit nicely in the email)
> ..as this problem occurs because a process tries to change the > terminal settings (and subsequently gets suspended because of that) > while it's not the owner of the terminal. > > This can happen if you fork something off to the background, e.g. like > > $ stty 9600 & > > (which should immediately give you [1]+ Stopped stty 9600), > > so can you please look for anything like that in your login scripts or > shell rc files?
I do use stty in my .bashrc (that's why this happens), but I do not put it in the background.
Anyway, hope the additional info above is of help...
Thanks, Joe
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