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kernel/module.c: wakeup processes in module_wq on module unload
commit5d60331161
upstream. Fix the race between load and unload a kernel module. sys_delete_module() try_stop_module() mod->state = _GOING add_unformed_module() old = find_module_all() (old->state == _GOING => wait_event_interruptible()) During pre-condition finished_loading() rets 0 schedule() (never gets waken up later) free_module() mod->state = _UNFORMED list_del_rcu(&mod->list) (dels mod from "modules" list) return The race above leads to modprobe hanging forever on loading a module. Error paths on loading module call wake_up_all(&module_wq) after freeing module, so let's do the same on straight module unload. Fixes:6e6de3dee5
("kernel/module.c: Only return -EEXIST for modules that have finished loading") Reviewed-by: Prarit Bhargava <prarit@redhat.com> Signed-off-by: Konstantin Khorenko <khorenko@virtuozzo.com> Signed-off-by: Jessica Yu <jeyu@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -1033,6 +1033,8 @@ SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
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strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
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free_module(mod);
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/* someone could wait for the module in add_unformed_module() */
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wake_up_all(&module_wq);
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return 0;
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out:
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mutex_unlock(&module_mutex);
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