From mboxrd@z Thu Jan 1 00:00:00 1970 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Subject: x86/mce: suspicious RCU usage in 4.13.4 From: Borislav Petkov Message-Id: <20171015094046.6477zglnee3s75lc@pd.tnic> Date: Sun, 15 Oct 2017 11:40:46 +0200 To: "Luck, Tony" Cc: Andi Kleen , Jeremy Cline , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , "x86@kernel.org" , "linux-edac@vger.kernel.org" , "linux-kernel@vger.kernel.org" , Laura Abbott List-ID: T24gV2VkLCBPY3QgMTEsIDIwMTcgYXQgMDk6MzQ6MjJQTSArMDAwMCwgTHVjaywgVG9ueSB3cm90 ZToKPiA+IGhlcmUncyBhIHNlY29uZCBhdHRlbXB0IGF0IGEgbW9yZSByaWdvcm91cyBzaW1wbGlm aWNhdGlvbjogUkNVIHN0dWZmIGlzCj4gPiBnb25lIGFuZCBvbmx5IGEgc2luZ2xlIGxvb3Agc2Nh bnMgdGhyb3VnaCB0aGUgZWxlbWVudHMuCj4gCj4gVGhlIGRldl9tY2VfbG9nKCkgY2hhbmdlcyBs b29rIGdvb2Qgbm93Lgo+IAo+IFlvdSBjYW4gYXBwbHkgdGhlIGF4ZSB0byBtb3JlIGJpdHMgb2Yg bWNlX2NocmRldl9yZWFkKCkgdGhvdWdoLiBMaWtlIHRoYXQKClRoYXQgcHJvdm9rZWQgYSB2ZXJ5 IHNlcmlvdXMgYXhpbmcuIFBsZWFzZSBjaGVjayB3aGV0aGVyIEkgd2VudCB0b28gZmFyLiBIdW5r CmJlbG93IGlzIG9udG9wIG9mIHdoYXQgZ290IGF4ZWQgYWxyZWFkeToKCmRpZmYgLS1naXQgYS9h cmNoL3g4Ni9rZXJuZWwvY3B1L21jaGVjay9kZXYtbWNlbG9nLmMgYi9hcmNoL3g4Ni9rZXJuZWwv Y3B1L21jaGVjay9kZXYtbWNlbG9nLmMKaW5kZXggMWUxYzZkMjJjOTNlLi4xN2QyYmFiMjU3MjAg MTAwNjQ0Ci0tLSBhL2FyY2gveDg2L2tlcm5lbC9jcHUvbWNoZWNrL2Rldi1tY2Vsb2cuYworKysg Yi9hcmNoL3g4Ni9rZXJuZWwvY3B1L21jaGVjay9kZXYtbWNlbG9nLmMKQEAgLTE2MiwxMyArMTYy LDYgQEAgc3RhdGljIGludCBtY2VfY2hyZGV2X3JlbGVhc2Uoc3RydWN0IGlub2RlICppbm9kZSwg c3RydWN0IGZpbGUgKmZpbGUpCiAJcmV0dXJuIDA7CiB9CiAKLXN0YXRpYyB2b2lkIGNvbGxlY3Rf dHNjcyh2b2lkICpkYXRhKQotewotCXVuc2lnbmVkIGxvbmcgKmNwdV90c2MgPSAodW5zaWduZWQg bG9uZyAqKWRhdGE7Ci0KLQljcHVfdHNjW3NtcF9wcm9jZXNzb3JfaWQoKV0gPSByZHRzYygpOwot fQotCiBzdGF0aWMgaW50IG1jZV9hcGVpX3JlYWRfZG9uZTsKIAogLyogQ29sbGVjdCBNQ0UgcmVj b3JkIG9mIHByZXZpb3VzIGJvb3QgaW4gcGVyc2lzdGVudCBzdG9yYWdlIHZpYSBBUEVJIEVSU1Qu ICovCkBAIC0yMTYsMTQgKzIwOSw5IEBAIHN0YXRpYyBzc2l6ZV90IG1jZV9jaHJkZXZfcmVhZChz dHJ1Y3QgZmlsZSAqZmlscCwgY2hhciBfX3VzZXIgKnVidWYsCiAJCQkJc2l6ZV90IHVzaXplLCBs b2ZmX3QgKm9mZikKIHsKIAljaGFyIF9fdXNlciAqYnVmID0gdWJ1ZjsKLQl1bnNpZ25lZCBsb25n ICpjcHVfdHNjOwotCXVuc2lnbmVkIHByZXYsIG5leHQ7CisJdW5zaWduZWQgbmV4dDsKIAlpbnQg aSwgZXJyOwogCi0JY3B1X3RzYyA9IGttYWxsb2MobnJfY3B1X2lkcyAqIHNpemVvZihsb25nKSwg R0ZQX0tFUk5FTCk7Ci0JaWYgKCFjcHVfdHNjKQotCQlyZXR1cm4gLUVOT01FTTsKLQogCW11dGV4 X2xvY2soJm1jZV9jaHJkZXZfcmVhZF9tdXRleCk7CiAKIAlpZiAoIW1jZV9hcGVpX3JlYWRfZG9u ZSkgewpAQCAtMjMyLDYzICsyMjAsMzIgQEAgc3RhdGljIHNzaXplX3QgbWNlX2NocmRldl9yZWFk KHN0cnVjdCBmaWxlICpmaWxwLCBjaGFyIF9fdXNlciAqdWJ1ZiwKIAkJCWdvdG8gb3V0OwogCX0K IAotCW5leHQgPSBtY2Vsb2cubmV4dDsKLQogCS8qIE9ubHkgc3VwcG9ydHMgZnVsbCByZWFkcyBy aWdodCBub3cgKi8KIAllcnIgPSAtRUlOVkFMOwogCWlmICgqb2ZmICE9IDAgfHwgdXNpemUgPCBN Q0VfTE9HX0xFTipzaXplb2Yoc3RydWN0IG1jZSkpCiAJCWdvdG8gb3V0OwogCisJbmV4dCA9IG1j ZWxvZy5uZXh0OwogCWVyciA9IDA7Ci0JcHJldiA9IDA7Ci0JZG8gewotCQlmb3IgKGkgPSBwcmV2 OyBpIDwgbmV4dDsgaSsrKSB7Ci0JCQl1bnNpZ25lZCBsb25nIHN0YXJ0ID0gamlmZmllczsKLQkJ CXN0cnVjdCBtY2UgKm0gPSAmbWNlbG9nLmVudHJ5W2ldOwotCi0JCQl3aGlsZSAoIW0tPmZpbmlz aGVkKSB7Ci0JCQkJaWYgKHRpbWVfYWZ0ZXJfZXEoamlmZmllcywgc3RhcnQgKyAyKSkgewotCQkJ CQltZW1zZXQobSwgMCwgc2l6ZW9mKCptKSk7Ci0JCQkJCWdvdG8gdGltZW91dDsKLQkJCQl9Ci0J CQkJY3B1X3JlbGF4KCk7Ci0JCQl9Ci0JCQlzbXBfcm1iKCk7Ci0JCQllcnIgfD0gY29weV90b191 c2VyKGJ1ZiwgbSwgc2l6ZW9mKCptKSk7Ci0JCQlidWYgKz0gc2l6ZW9mKCptKTsKLXRpbWVvdXQ6 Ci0JCQk7Ci0JCX0KLQotCQltZW1zZXQobWNlbG9nLmVudHJ5ICsgcHJldiwgMCwKLQkJICAgICAg IChuZXh0IC0gcHJldikgKiBzaXplb2Yoc3RydWN0IG1jZSkpOwotCQlwcmV2ID0gbmV4dDsKLQkJ bmV4dCA9IGNtcHhjaGcoJm1jZWxvZy5uZXh0LCBwcmV2LCAwKTsKLQl9IHdoaWxlIChuZXh0ICE9 IHByZXYpOwotCi0JLyoKLQkgKiBDb2xsZWN0IGVudHJpZXMgdGhhdCB3ZXJlIHN0aWxsIGdldHRp bmcgd3JpdHRlbiBiZWZvcmUgdGhlCi0JICogc3luY2hyb25pemUuCi0JICovCi0Jb25fZWFjaF9j cHUoY29sbGVjdF90c2NzLCBjcHVfdHNjLCAxKTsKIAotCWZvciAoaSA9IG5leHQ7IGkgPCBNQ0Vf TE9HX0xFTjsgaSsrKSB7CisJZm9yIChpID0gMDsgaSA8IG5leHQ7IGkrKykgewogCQlzdHJ1Y3Qg bWNlICptID0gJm1jZWxvZy5lbnRyeVtpXTsKIAotCQlpZiAobS0+ZmluaXNoZWQgJiYgbS0+dHNj IDwgY3B1X3RzY1ttLT5jcHVdKSB7Ci0JCQllcnIgfD0gY29weV90b191c2VyKGJ1ZiwgbSwgc2l6 ZW9mKCptKSk7Ci0JCQlzbXBfcm1iKCk7Ci0JCQlidWYgKz0gc2l6ZW9mKCptKTsKLQkJCW1lbXNl dChtLCAwLCBzaXplb2YoKm0pKTsKLQkJfQorCQlpZiAoIW0tPmZpbmlzaGVkKQorCQkJY29udGlu dWU7CisKKwkJZXJyIHw9IGNvcHlfdG9fdXNlcihidWYsIG0sIHNpemVvZigqbSkpOworCQlidWYg Kz0gc2l6ZW9mKCptKTsKIAl9CiAKKwltZW1zZXQobWNlbG9nLmVudHJ5LCAwLCBuZXh0ICogc2l6 ZW9mKHN0cnVjdCBtY2UpKTsKKwltY2Vsb2cubmV4dCA9IDA7CisKIAlpZiAoZXJyKQogCQllcnIg PSAtRUZBVUxUOwogCiBvdXQ6CiAJbXV0ZXhfdW5sb2NrKCZtY2VfY2hyZGV2X3JlYWRfbXV0ZXgp OwotCWtmcmVlKGNwdV90c2MpOwogCiAJcmV0dXJuIGVyciA/IGVyciA6IGJ1ZiAtIHVidWY7CiB9 Cg==