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utrace_control(XXXSTEP)->is_setting_trap_flag() is not safe



Btw, I believe we have another problem. utrace_control(SINGLESTEP) calls
user_enable_single_step() under utrace->lock. I don't really understand
the magic in enable_single_step() but is_setting_trap_flag() calls
access_process_vm(), this doesn't look good under spinlock.

Hmm. Not sure how to fix this...

Oleg.


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