linux-kernel - Re: [PATCH v3 2/2] UBSAN: run-time undefined behavior sanity checker

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Message-ID: <201512010119.fW408Kb6%fengguang.wu@intel.com>
Date:	Tue, 1 Dec 2015 01:23:29 +0800
From:	kbuild test robot <lkp@...el.com>
To:	Andrey Ryabinin <aryabinin@...tuozzo.com>
Cc:	kbuild-all@...org, linux-kernel@...r.kernel.org,
	Andrey Ryabinin <aryabinin@...tuozzo.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Sasha Levin <sasha.levin@...cle.com>,
	Randy Dunlap <rdunlap@...radead.org>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Jonathan Corbet <corbet@....net>,
	Michal Marek <mmarek@...e.cz>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Yury Gribov <y.gribov@...sung.com>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Konstantin Khlebnikov <koct9i@...il.com>,
	Kostya Serebryany <kcc@...gle.com>, x86@...nel.org,
	linux-doc@...r.kernel.org, linux-kbuild@...r.kernel.org
Subject: Re: [PATCH v3 2/2] UBSAN: run-time undefined behavior sanity checker

Hi Andrey,

[auto build test ERROR on: v4.4-rc3]
[cannot apply to: tip/x86/core kbuild/for-next next-20151127]

url:    https://github.com/0day-ci/linux/commits/Andrey-Ryabinin/kernel-printk-specify-alignment-for-struct-printk_log/20151201-000229
config: i386-allyesconfig (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   net/mac80211/debugfs.c: In function 'hwflags_read':
>> net/mac80211/debugfs.c:150:240: error: call to '__compiletime_assert_150' declared with attribute error: BUILD_BUG_ON failed: hw_flag_names[NUM_IEEE80211_HW_FLAGS] != (void *)0x1

vim +/__compiletime_assert_150 +150 net/mac80211/debugfs.c

279daf64 Ben Greear               2011-03-23  134  static ssize_t hwflags_read(struct file *file, char __user *user_buf,
279daf64 Ben Greear               2011-03-23  135  			    size_t count, loff_t *ppos)
279daf64 Ben Greear               2011-03-23  136  {
279daf64 Ben Greear               2011-03-23  137  	struct ieee80211_local *local = file->private_data;
30686bf7 Johannes Berg            2015-06-02  138  	size_t bufsz = 30 * NUM_IEEE80211_HW_FLAGS;
30686bf7 Johannes Berg            2015-06-02  139  	char *buf = kzalloc(bufsz, GFP_KERNEL);
30686bf7 Johannes Berg            2015-06-02  140  	char *pos = buf, *end = buf + bufsz - 1;
279daf64 Ben Greear               2011-03-23  141  	ssize_t rv;
30686bf7 Johannes Berg            2015-06-02  142  	int i;
279daf64 Ben Greear               2011-03-23  143  
d15b8459 Joe Perches              2011-08-29  144  	if (!buf)
30686bf7 Johannes Berg            2015-06-02  145  		return -ENOMEM;
30686bf7 Johannes Berg            2015-06-02  146  
30686bf7 Johannes Berg            2015-06-02  147  	/* fail compilation if somebody adds or removes
30686bf7 Johannes Berg            2015-06-02  148  	 * a flag without updating the name array above
30686bf7 Johannes Berg            2015-06-02  149  	 */
30686bf7 Johannes Berg            2015-06-02 @150  	BUILD_BUG_ON(hw_flag_names[NUM_IEEE80211_HW_FLAGS] != (void *)0x1);
30686bf7 Johannes Berg            2015-06-02  151  
30686bf7 Johannes Berg            2015-06-02  152  	for (i = 0; i < NUM_IEEE80211_HW_FLAGS; i++) {
30686bf7 Johannes Berg            2015-06-02  153  		if (test_bit(i, local->hw.flags))
4633dfc3 Mohammed Shafi Shajakhan 2015-10-08  154  			pos += scnprintf(pos, end - pos, "%s\n",
30686bf7 Johannes Berg            2015-06-02  155  					 hw_flag_names[i]);
30686bf7 Johannes Berg            2015-06-02  156  	}
279daf64 Ben Greear               2011-03-23  157  
279daf64 Ben Greear               2011-03-23  158  	rv = simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf));

:::::: The code at line 150 was first introduced by commit
:::::: 30686bf7f5b3c30831761e188a6e3cb33580fa48 mac80211: convert HW flags to unsigned long bitmap

:::::: TO: Johannes Berg <johannes.berg@...el.com>
:::::: CC: Johannes Berg <johannes.berg@...el.com>

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