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I just noticed this afternoon that my poll probe example wasn't working correctly. I can simplify it to a single empty probe and still see the problem. The probe is
void fastcall inst_add_wait_queue (wait_queue_head_t *q, wait_queue_t *wait) { jprobe_return(); }
I'll attach full source.
I compile that code into a module and load it. Then launch Firefox. Firefox almost never launches. It usually hangs immediately. In the rare case it launches, if I close it and try to launch it again, it hangs. Eventually the system locks up.
This happens on an x86_64 running 2.6.10-1.753_FC3.smp and an x86 running 2.6.10-1.741_FC3.smp
Martin
2.6.10-1.7241_FC3 (appeared to work/not crash system) 2.6.10-1.741_FC3smp (appeared to work/not crash system)
# trying to replicate martin hunts problem probe add_wait_queue:entry { } proto { void fastcall add_wait_queue (wait_queue_head_t *q, wait_queue_t *wait); }
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