Fengguang Wu [2014-03-08 20:11 +0800]: > [ 4.429993] mac80211_hwsim: ieee80211_register_hw failed (-2) > [...] > [ 4.431924] [<c12377de>] get_device+0xf/0x17 > [ 4.431924] [<c123a165>] driver_detach+0x38/0x8f > [ 4.431924] [<c1239433>] bus_remove_driver+0x53/0x66 > [ 4.431924] [<c123a535>] driver_unregister+0x38/0x3d > [ 4.431924] [<c123b3aa>] platform_driver_unregister+0xb/0xd > [ 4.431924] [<c1c4ac9f>] init_mac80211_hwsim+0x3a5/0x3b6
So that first message is from http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/net/wireless/mac80211_hwsim.c?id=9ea927748#n2428 At this point we registered the platform driver and the class, and it should have created two devices (at least for the default radios=2). What's odd is that I don't see this printk in your kernel log: mac80211_hwsim: Initializing radio %d If for some reasons "radio" is 0, it would not show this and not initialize data->dev, but then you shouldn't get to ieee80211_register_hw() either as it's in the same loop. So that's a bit of a mystery to me. On failure, above ieee80211_register_hw() jumps to the cleanup: | failed_hw: | device_unregister(data->dev); | failed_drvdata: | ieee80211_free_hw(hw); | failed: | mac80211_hwsim_free(); | failed_unregister_driver: | driver_unregister(&mac80211_hwsim_driver); | return err; | } The mac80211_hwsim_free() function again calls device_unregister(data->dev) for a list (not sure which, I'm not certain how to interpret list_for_each_entry_safe(data, tmpdata, &tmplist, list) ) Could that be the double free causing the memory corruption? If you are in a position to do quick builds and tests, does the crash go away with this? printk(KERN_DEBUG "mac80211_hwsim: device_bind_driver failed (%d)\n", err); - goto failed_hw; + goto failed_drvdata; } (I'm not claiming that this is correct, just taking a stab at understanding what happens) If not, does it go away with changing the goto to failed_unregister_driver()? Thanks, Martin -- Martin Pitt | http://www.piware.de Ubuntu Developer (www.ubuntu.com) | Debian Developer (www.debian.org)
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