kernel timers do not expire

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I have a Linux system, running a couple of third party kernel modules.
The functionality seems all right except a rare case where kernel
timers stop expiring. When the system reaches this state, everything
works fine except the functionalities depending upon kernel timers.
For example:

- "sleep 3" on shell never returns
- telnet <to some unreachable host> never returns
- sample kernel module registers timer using add_timer. But timer never expires

It appears to me that one of third party kernel module is causing
this. Before I look into the source code, can someone give some hints
about possible reasons where kernel timers may stop working
(expiring).

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