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Message-ID: <a08aa1b3-9d75-2f38-a0f0-aefe181137da@molgen.mpg.de> Date: Wed, 20 Dec 2017 12:00:48 +0100 From: Paul Menzel <pmenzel+linux-wireless@...gen.mpg.de> To: Luca Coelho <luca@...lho.fi>, Johannes Berg <johannes.berg@...el.com>, Emmanuel Grumbach <emmanuel.grumbach@...el.com>, Intel Linux Wireless <linuxwifi@...el.com> Cc: linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org, it+linux-wireless@...gen.mpg.de Subject: Re: UBSAN: Undefined behaviour in drivers/net/wireless/intel/iwlwifi/mvm/utils.c:838:5 Dear Luca, Am 18.12.2017 um 19:30 schrieb Luca Coelho: > On Wed, 2017-12-13 at 16:32 +0200, Luciano Coelho wrote: >> On Wed, 2017-12-13 at 14:25 +0100, Paul Menzel wrote: >>> I enabled the undefined behavior sanitizer, and built Linus’ >>> master branch under Ubuntu 17.10 with gcc (Ubuntu 7.2.0-8ubuntu3) >>> 7.2.0. >>> >>> ``` $ grep UBSAN /boot/config-4.15.0-rc3+ >>> CONFIG_ARCH_HAS_UBSAN_SANITIZE_ALL=y # >>> CONFIG_ARCH_WANTS_UBSAN_NO_NULL is not set CONFIG_UBSAN=y >>> CONFIG_UBSAN_SANITIZE_ALL=y # CONFIG_UBSAN_ALIGNMENT is not set >>> CONFIG_UBSAN_NULL=y ``` >>> >>> Starting the system the messages below are printed. >>> >>> Starting the system and using the wireless device shows the >>> messages below. >> >> Thanks for reporting! This shouldn't cause any problems, but I'll >> fix it by checking that the mac80211_queue is not INVALID_QUEUE >> (255) which seems to be the trigger for this warning. > > Can you try the following patch to see if the problem goes away? > > http://pastebin.coelho.fi/7b624f474846da52.txt Thank you. The warning is gone now. Thank you. For the next time, it’d be great to provide the output of `git format-patch -1`, which can be applied with `git am`. The output of `git show` is with my knowledge hard to apply. Kind regards, Paul
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