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SubjectRe: [BUG] threaded processes get stuck in rt_sigsuspend/fillonedir/exit_notify
Mark Kettenis wrote:

> From: Ulrich Drepper <drepper@redhat.com>
> Date: 2000-09-13 6:35:16
>
> tytso@mit.edu writes:
>
> > I didn't realize things had changed that broke the old threading model.
> > Did Linus do more than add support for the new thread groups? I didn't
> > think any that had changed that would break the old LinuxThread
> > programs.
>
> First he introduces CLONE_THREAD (or how it was called). This was
> fine. But in pre2 ore pre3 he unified CLONE_SIGHAND and CLONE_THREAD
> under the new name CLONE_SIGNAL which makes perfect if CLONE_SIGHAND
> would be used. But it is. Simply undo this change, separate the two
> flags.
>
> This has been fixed in test8 (final). CLONE_SIGHAND and CLONE_THREAD
> are seperate bits again, and CLONE_SIGNAL is both of them or'ed
> together.

Something else is broken then which only happens to threaded programs on test8
stuff.

$ pse|grep defun
88 [nscd <defunct>] exit_notify
89 [nscd <defunct>] exit_notify
90 [nscd <defunct>] exit_notify
91 [nscd <defunct>] exit_notify
1097 [host <defunct>] exit_notify
1098 [host <defunct>] exit_notify
1110 [host <defunct>] exit_notify
1111 [host <defunct>] exit_notify
1115 [nslookup <defun exit_notify
1116 [nslookup <defun exit_notify
1117 [nslookup <defun exit_notify
1118 [nslookup <defun exit_notify
1124 [nslookup <defun exit_notify
1125 [nslookup <defun exit_notify
1126 [nslookup <defun exit_notify
1170 [host <defunct>] exit_notify
1175 [host <defunct>] exit_notify
1177 [host <defunct>] exit_notify
1182 [host <defunct>] exit_notify
1184 [host <defunct>] exit_notify
1190 [host <defunct>] exit_notify
1192 [host <defunct>] exit_notify
1197 [host <defunct>] exit_notify
1199 [host <defunct>] exit_notify
1168 [host <defunct>] exit_notify
14899 [xmms <defunct>] exit_notify
14902 [xmms <defunct>] exit_notify
14903 [xmms <defunct>] exit_notify
[...] goes on and on. almost 100 processes stuck now.

here's one that is currently stuck:

8243 pan rt_sigsuspend
8244 pan rt_sigsuspend
8249 pan rt_sigsuspend

gdb pan 8243
[...]
(gdb) bt
#0 0x40498d05 in __sigsuspend (set=0xbf7ffab4)
at ../sysdeps/unix/sysv/linux/sigsuspend.c:48
#1 0x4044f2f4 in __pthread_wait_for_restart_signal (self=0xbf7ffe40)
at pthread.c:785
#2 0x4044cfd2 in pthread_cond_timedwait_relative_new (cond=0x80eb4f8,
mutex=0x80eebd0, abstime=0xbf7ffd64) at restart.h:26
#3 0x4044d054 in pthread_cond_timedwait (cond=0x80eb4f8, mutex=0x80eebd0,
abstime=0xbf7ffd64) at condvar.c:381
#4 0x808ade6 in queue_mainloop ()
#5 0x4044d938 in pthread_start_thread (arg=0xbf7ffe40) at manager.c:241

a kill -9 is the only thing that will kick it, but that yields a zombie.

-d







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