Messages in this thread | | | Date | Thu, 26 Jan 2012 18:56:12 +0100 | From | Oleg Nesterov <> | Subject | Re: + kmod-avoid-deadlock-by-recursive-kmod-call.patch added to -mm tree |
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> @@ -449,6 +460,16 @@ int call_usermodehelper_exec(struct subp > retval = -EBUSY; > goto out; > } > + /* > + * Worker thread must not wait for khelper thread at below > + * wait_for_completion() if the thread was created with CLONE_VFORK > + * flag, for khelper thread is already waiting for the thread at > + * wait_for_completion() in do_fork(). > + */ > + if (wait != UMH_NO_WAIT && current == kmod_thread_locker) { > + retval = -EBUSY; > + goto out; > + }
So, this is because khelper_wq's max_active == 1.
Can't we simply kill khelper_wq and use system_unbound_wq instead?
Oleg.
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