[LU-218] deadlock (pagefault vs. blocking ast) in clio

Mon, 18 Apr 2011 18:46:30 +0000

The following deadlock was hit when I was running mmap tests:

mmap test thread: pagefault -> lock page -> release dlm lock -> cancel dlm lock -> cl_lock_mutex_get;
bl_ast handler thread: cancel dlm lock -> cl_lock_mutex_get -> flush pages -> lock page;

And because of this deadlock, ll_imp_inval thread is blocked on cl_lock_mutex_get, so the client eviction can never be finished. I think it's the root cause of ~~LU-180~~, but I'm not 100 percent sure because they didn't provide the stack trace to prove it yet.

The stack trace is attached.

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[LU-218] deadlock (pagefault vs. blocking ast) in clio