Infinite loop with stat watcher and inotify

[Graham Leggett]

Hi all,




During the spin, the program flow looks like below.

The spin is happening because w_, w and w_->next all have the same value:

(gdb) print w_
$1 = (WL) 0x1f12d710
(gdb) print w
$2 = (ev_stat *) 0x1f12d710
(gdb) print w_->next
$3 = (struct ev_watcher_list *) 0x1f12d710



2514          for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
(gdb)
2516              ev_stat *w = (ev_stat *)w_;
(gdb)

(gdb)
2519              if (w->wd == wd || wd == -1)
(gdb)
2514          for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
(gdb)
2516              ev_stat *w = (ev_stat *)w_;
(gdb)

(gdb)
2519              if (w->wd == wd || wd == -1)
(gdb)
2514          for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
(gdb)
2516              ev_stat *w = (ev_stat *)w_;
(gdb)

(gdb)
2519              if (w->wd == wd || wd == -1)
(gdb)
2514          for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
(gdb)
2516              ev_stat *w = (ev_stat *)w_;
(gdb)

(gdb)
2519              if (w->wd == wd || wd == -1)
(gdb)

Regards,
Graham
--

I have been testing my libev application under RHEL5 instead of MacOSX, and I have discovered an infinite loop that develops within libev that causes the app to hang (and spin). Does anyone have any ideas on how this might have happened? I am using libev v3.49, and the Linux kernel version is kernel-2.6.18-53.1.13.el5. 2517 w_ = w_->next; /* lets us remove this watcher and all before it */ 2517 w_ = w_->next; /* lets us remove this watcher and all before it */ 2517 w_ = w_->next; /* lets us remove this watcher and all before it */ 2517 w_ = w_->next; /* lets us remove this watcher and all before it */

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