From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 06C3AC4338F for ; Tue, 17 Aug 2021 12:13:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D8BD561029 for ; Tue, 17 Aug 2021 12:13:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239889AbhHQMOY (ORCPT ); Tue, 17 Aug 2021 08:14:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53458 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236113AbhHQMOW (ORCPT ); Tue, 17 Aug 2021 08:14:22 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 703ABC061764; Tue, 17 Aug 2021 05:13:49 -0700 (PDT) Date: Tue, 17 Aug 2021 14:13:45 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1629202426; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=d+uxAWrK6C0K97c8hr+MoI9FmXO1BEDPSMGIWGczVk8=; b=yrlAYk9W1HkvijTPh6VaegiUXmmAdYVcDOkdESa0jH/HQYqih+P+5LqH2QRQOBCmjOCOvK oaK1y7xnAS2Fn3a+xQ9/iyH1hO+oNt4KyhK9u4nM7eukazdjM/Y+2NdJtOVddf/X87zihV G9b81Qk6himwgAR7xg4OSMbkrNMZsCHs0gXJq47wnSvB2vBr7nn16QnOE65lWLAgyQ4Zbz uKH2Hs4ksrRMk+oCuh9HWRkrF2GFcS78Y7ontWCgfSVwGslm/TGeoL/YLhtkwo3sk2KuZ3 twe0CYOOhF+OoM/rizz4ljcQF39bk49m1+vE9Gkdiyzyh0YwAG7b+m/4gnvc8g== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1629202427; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=d+uxAWrK6C0K97c8hr+MoI9FmXO1BEDPSMGIWGczVk8=; b=v/OZAm542MS2E32XiA5RqzfEd9kCCfdxNFDNsNISAfhDREJorL86wsOolhrmT5IlqkhX2m c9C0u9GW5DUbeGBA== From: Sebastian Andrzej Siewior To: Valentin Schneider Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, rcu@vger.kernel.org, linux-rt-users@vger.kernel.org, Catalin Marinas , Will Deacon , Ingo Molnar , Peter Zijlstra , Thomas Gleixner , Steven Rostedt , Daniel Bristot de Oliveira , "Paul E. McKenney" , Frederic Weisbecker , Josh Triplett , Mathieu Desnoyers , Davidlohr Bueso , Lai Jiangshan , Joel Fernandes , Anshuman Khandual , Vincenzo Frascino , Steven Price , Ard Biesheuvel , Boqun Feng , Mike Galbraith Subject: Re: [PATCH v3 1/4] rcutorture: Don't disable softirqs with preemption disabled when PREEMPT_RT Message-ID: <20210817121345.5iyj5epemczn3a52@linutronix.de> References: <20210811201354.1976839-1-valentin.schneider@arm.com> <20210811201354.1976839-2-valentin.schneider@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable In-Reply-To: <20210811201354.1976839-2-valentin.schneider@arm.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2021-08-11 21:13:51 [+0100], Valentin Schneider wrote: > Running RCU torture with CONFIG_PREEMPT_RT under v5.14-rc4-rt6 triggers: >=20 > [ 8.755472] DEBUG_LOCKS_WARN_ON(this_cpu_read(softirq_ctrl.cnt)) > [ 8.755482] WARNING: CPU: 1 PID: 137 at kernel/softirq.c:172 __local_b= h_disable_ip (kernel/softirq.c:172 (discriminator 31)) > [ 8.755500] Modules linked in: > [ 8.755506] CPU: 1 PID: 137 Comm: rcu_torture_rea Not tainted 5.14.0-r= c4-rt6 #171 > [ 8.755514] Hardware name: ARM Juno development board (r0) (DT) > [ 8.755518] pstate: 60000005 (nZCv daif -PAN -UAO -TCO BTYPE=3D--) > [ 8.755622] Call trace: > [ 8.755624] __local_bh_disable_ip (kernel/softirq.c:172 (discriminator= 31)) > [ 8.755633] rcutorture_one_extend (kernel/rcu/rcutorture.c:1453) > [ 8.755640] rcu_torture_one_read (kernel/rcu/rcutorture.c:1601 kernel/= rcu/rcutorture.c:1645) > [ 8.755645] rcu_torture_reader (kernel/rcu/rcutorture.c:1737) > [ 8.755650] kthread (kernel/kthread.c:327) > [ 8.755656] ret_from_fork (arch/arm64/kernel/entry.S:783) > [ 8.755663] irq event stamp: 11959 > [ 8.755666] hardirqs last enabled at (11959): __rcu_read_unlock (kerne= l/rcu/tree_plugin.h:695 kernel/rcu/tree_plugin.h:451) > [ 8.755675] hardirqs last disabled at (11958): __rcu_read_unlock (kern= el/rcu/tree_plugin.h:661 kernel/rcu/tree_plugin.h:451) > [ 8.755683] softirqs last enabled at (11950): __local_bh_enable_ip (./= arch/arm64/include/asm/irqflags.h:85 kernel/softirq.c:261) > [ 8.755692] softirqs last disabled at (11942): rcutorture_one_extend (= =2E/include/linux/bottom_half.h:19 kernel/rcu/rcutorture.c:1441) >=20 > Per this warning, softirqs cannot be disabled in a non-preemptible region > under CONFIG_PREEMPT_RT. Adjust RCU torture accordingly. >=20 > Signed-off-by: Valentin Schneider > --- > kernel/rcu/rcutorture.c | 2 ++ > 1 file changed, 2 insertions(+) >=20 > diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c > index eecd1caef71d..4f3db1d3170d 100644 > --- a/kernel/rcu/rcutorture.c > +++ b/kernel/rcu/rcutorture.c > @@ -1548,6 +1548,8 @@ rcutorture_extend_mask(int oldmask, struct torture_= random_state *trsp) > * them on non-RT. > */ > if (IS_ENABLED(CONFIG_PREEMPT_RT)) { > + /* Can't disable bh in atomic context under PREEMPT_RT */ > + mask &=3D ~(RCUTORTURE_RDR_ATOM_BH | RCUTORTURE_RDR_ATOM_RBH); Let me stare at this=E2=80=A6 > /* > * Can't release the outermost rcu lock in an irq disabled > * section without preemption also being disabled, if irqs > --=20 > 2.25.1 Sebastian From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-14.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A2DC9C4338F for ; Tue, 17 Aug 2021 12:16:10 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 64EFC6023F for ; Tue, 17 Aug 2021 12:16:10 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 64EFC6023F Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linutronix.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=C1dIzUZEjkC3jgk0F7I4toX2q14mbT3V3FMBnir/JFk=; b=r+/pmeHU+55o+X IyHFq6aXfTPZM/k5opKOCA2/OWa8uVU1X4oNIQbAJ4N3axWThD9h0vjTfJ/bXyrqw+1MwfzsDVbOB BMca5g2iIk4QUEsB1Ii0AesquAL2+HiKUTb1MLcTtWXHYqTnUr8n8jbPKFy1YLIZUWuVnLXEUDMsT Gjzu6JD/lWtWdaFVuLcpNMmtFwwA5oVly5D06ysjDR5ymumE034h2ida8xupEiKnAMl6Z1+dirgXZ QY7b66J7DmUxVYfS//U2w8Yeo4LryTUHYHmICv+sz+bSZlRFnCtHPLQ+w/CDdPze7dDWRueUL6z7j QC20BBy1DrkxU6QcApJw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mFxyf-002Or7-Ai; Tue, 17 Aug 2021 12:13:57 +0000 Received: from galois.linutronix.de ([193.142.43.55]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1mFxyX-002Onn-9F for linux-arm-kernel@lists.infradead.org; Tue, 17 Aug 2021 12:13:55 +0000 Date: Tue, 17 Aug 2021 14:13:45 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1629202426; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=d+uxAWrK6C0K97c8hr+MoI9FmXO1BEDPSMGIWGczVk8=; b=yrlAYk9W1HkvijTPh6VaegiUXmmAdYVcDOkdESa0jH/HQYqih+P+5LqH2QRQOBCmjOCOvK oaK1y7xnAS2Fn3a+xQ9/iyH1hO+oNt4KyhK9u4nM7eukazdjM/Y+2NdJtOVddf/X87zihV G9b81Qk6himwgAR7xg4OSMbkrNMZsCHs0gXJq47wnSvB2vBr7nn16QnOE65lWLAgyQ4Zbz uKH2Hs4ksrRMk+oCuh9HWRkrF2GFcS78Y7ontWCgfSVwGslm/TGeoL/YLhtkwo3sk2KuZ3 twe0CYOOhF+OoM/rizz4ljcQF39bk49m1+vE9Gkdiyzyh0YwAG7b+m/4gnvc8g== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1629202427; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=d+uxAWrK6C0K97c8hr+MoI9FmXO1BEDPSMGIWGczVk8=; b=v/OZAm542MS2E32XiA5RqzfEd9kCCfdxNFDNsNISAfhDREJorL86wsOolhrmT5IlqkhX2m c9C0u9GW5DUbeGBA== From: Sebastian Andrzej Siewior To: Valentin Schneider Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, rcu@vger.kernel.org, linux-rt-users@vger.kernel.org, Catalin Marinas , Will Deacon , Ingo Molnar , Peter Zijlstra , Thomas Gleixner , Steven Rostedt , Daniel Bristot de Oliveira , "Paul E. McKenney" , Frederic Weisbecker , Josh Triplett , Mathieu Desnoyers , Davidlohr Bueso , Lai Jiangshan , Joel Fernandes , Anshuman Khandual , Vincenzo Frascino , Steven Price , Ard Biesheuvel , Boqun Feng , Mike Galbraith Subject: Re: [PATCH v3 1/4] rcutorture: Don't disable softirqs with preemption disabled when PREEMPT_RT Message-ID: <20210817121345.5iyj5epemczn3a52@linutronix.de> References: <20210811201354.1976839-1-valentin.schneider@arm.com> <20210811201354.1976839-2-valentin.schneider@arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210811201354.1976839-2-valentin.schneider@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210817_051349_603446_D70C2086 X-CRM114-Status: GOOD ( 13.39 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gMjAyMS0wOC0xMSAyMToxMzo1MSBbKzAxMDBdLCBWYWxlbnRpbiBTY2huZWlkZXIgd3JvdGU6 Cj4gUnVubmluZyBSQ1UgdG9ydHVyZSB3aXRoIENPTkZJR19QUkVFTVBUX1JUIHVuZGVyIHY1LjE0 LXJjNC1ydDYgdHJpZ2dlcnM6Cj4gCj4gWyAgICA4Ljc1NTQ3Ml0gREVCVUdfTE9DS1NfV0FSTl9P Tih0aGlzX2NwdV9yZWFkKHNvZnRpcnFfY3RybC5jbnQpKQo+IFsgICAgOC43NTU0ODJdIFdBUk5J Tkc6IENQVTogMSBQSUQ6IDEzNyBhdCBrZXJuZWwvc29mdGlycS5jOjE3MiBfX2xvY2FsX2JoX2Rp c2FibGVfaXAgKGtlcm5lbC9zb2Z0aXJxLmM6MTcyIChkaXNjcmltaW5hdG9yIDMxKSkKPiBbICAg IDguNzU1NTAwXSBNb2R1bGVzIGxpbmtlZCBpbjoKPiBbICAgIDguNzU1NTA2XSBDUFU6IDEgUElE OiAxMzcgQ29tbTogcmN1X3RvcnR1cmVfcmVhIE5vdCB0YWludGVkIDUuMTQuMC1yYzQtcnQ2ICMx NzEKPiBbICAgIDguNzU1NTE0XSBIYXJkd2FyZSBuYW1lOiBBUk0gSnVubyBkZXZlbG9wbWVudCBi b2FyZCAocjApIChEVCkKPiBbICAgIDguNzU1NTE4XSBwc3RhdGU6IDYwMDAwMDA1IChuWkN2IGRh aWYgLVBBTiAtVUFPIC1UQ08gQlRZUEU9LS0pCj4gWyAgICA4Ljc1NTYyMl0gQ2FsbCB0cmFjZToK PiBbICAgIDguNzU1NjI0XSBfX2xvY2FsX2JoX2Rpc2FibGVfaXAgKGtlcm5lbC9zb2Z0aXJxLmM6 MTcyIChkaXNjcmltaW5hdG9yIDMxKSkKPiBbICAgIDguNzU1NjMzXSByY3V0b3J0dXJlX29uZV9l eHRlbmQgKGtlcm5lbC9yY3UvcmN1dG9ydHVyZS5jOjE0NTMpCj4gWyAgICA4Ljc1NTY0MF0gcmN1 X3RvcnR1cmVfb25lX3JlYWQgKGtlcm5lbC9yY3UvcmN1dG9ydHVyZS5jOjE2MDEga2VybmVsL3Jj dS9yY3V0b3J0dXJlLmM6MTY0NSkKPiBbICAgIDguNzU1NjQ1XSByY3VfdG9ydHVyZV9yZWFkZXIg KGtlcm5lbC9yY3UvcmN1dG9ydHVyZS5jOjE3MzcpCj4gWyAgICA4Ljc1NTY1MF0ga3RocmVhZCAo a2VybmVsL2t0aHJlYWQuYzozMjcpCj4gWyAgICA4Ljc1NTY1Nl0gcmV0X2Zyb21fZm9yayAoYXJj aC9hcm02NC9rZXJuZWwvZW50cnkuUzo3ODMpCj4gWyAgICA4Ljc1NTY2M10gaXJxIGV2ZW50IHN0 YW1wOiAxMTk1OQo+IFsgICAgOC43NTU2NjZdIGhhcmRpcnFzIGxhc3QgZW5hYmxlZCBhdCAoMTE5 NTkpOiBfX3JjdV9yZWFkX3VubG9jayAoa2VybmVsL3JjdS90cmVlX3BsdWdpbi5oOjY5NSBrZXJu ZWwvcmN1L3RyZWVfcGx1Z2luLmg6NDUxKQo+IFsgICAgOC43NTU2NzVdIGhhcmRpcnFzIGxhc3Qg ZGlzYWJsZWQgYXQgKDExOTU4KTogX19yY3VfcmVhZF91bmxvY2sgKGtlcm5lbC9yY3UvdHJlZV9w bHVnaW4uaDo2NjEga2VybmVsL3JjdS90cmVlX3BsdWdpbi5oOjQ1MSkKPiBbICAgIDguNzU1Njgz XSBzb2Z0aXJxcyBsYXN0IGVuYWJsZWQgYXQgKDExOTUwKTogX19sb2NhbF9iaF9lbmFibGVfaXAg KC4vYXJjaC9hcm02NC9pbmNsdWRlL2FzbS9pcnFmbGFncy5oOjg1IGtlcm5lbC9zb2Z0aXJxLmM6 MjYxKQo+IFsgICAgOC43NTU2OTJdIHNvZnRpcnFzIGxhc3QgZGlzYWJsZWQgYXQgKDExOTQyKTog cmN1dG9ydHVyZV9vbmVfZXh0ZW5kICguL2luY2x1ZGUvbGludXgvYm90dG9tX2hhbGYuaDoxOSBr ZXJuZWwvcmN1L3JjdXRvcnR1cmUuYzoxNDQxKQo+IAo+IFBlciB0aGlzIHdhcm5pbmcsIHNvZnRp cnFzIGNhbm5vdCBiZSBkaXNhYmxlZCBpbiBhIG5vbi1wcmVlbXB0aWJsZSByZWdpb24KPiB1bmRl ciBDT05GSUdfUFJFRU1QVF9SVC4gQWRqdXN0IFJDVSB0b3J0dXJlIGFjY29yZGluZ2x5Lgo+IAo+ IFNpZ25lZC1vZmYtYnk6IFZhbGVudGluIFNjaG5laWRlciA8dmFsZW50aW4uc2NobmVpZGVyQGFy bS5jb20+Cj4gLS0tCj4gIGtlcm5lbC9yY3UvcmN1dG9ydHVyZS5jIHwgMiArKwo+ICAxIGZpbGUg Y2hhbmdlZCwgMiBpbnNlcnRpb25zKCspCj4gCj4gZGlmZiAtLWdpdCBhL2tlcm5lbC9yY3UvcmN1 dG9ydHVyZS5jIGIva2VybmVsL3JjdS9yY3V0b3J0dXJlLmMKPiBpbmRleCBlZWNkMWNhZWY3MWQu LjRmM2RiMWQzMTcwZCAxMDA2NDQKPiAtLS0gYS9rZXJuZWwvcmN1L3JjdXRvcnR1cmUuYwo+ICsr KyBiL2tlcm5lbC9yY3UvcmN1dG9ydHVyZS5jCj4gQEAgLTE1NDgsNiArMTU0OCw4IEBAIHJjdXRv cnR1cmVfZXh0ZW5kX21hc2soaW50IG9sZG1hc2ssIHN0cnVjdCB0b3J0dXJlX3JhbmRvbV9zdGF0 ZSAqdHJzcCkKPiAgCSAqIHRoZW0gb24gbm9uLVJULgo+ICAJICovCj4gIAlpZiAoSVNfRU5BQkxF RChDT05GSUdfUFJFRU1QVF9SVCkpIHsKPiArCQkvKiBDYW4ndCBkaXNhYmxlIGJoIGluIGF0b21p YyBjb250ZXh0IHVuZGVyIFBSRUVNUFRfUlQgKi8KPiArCQltYXNrICY9IH4oUkNVVE9SVFVSRV9S RFJfQVRPTV9CSCB8IFJDVVRPUlRVUkVfUkRSX0FUT01fUkJIKTsKCkxldCBtZSBzdGFyZSBhdCB0 aGlz4oCmCgo+ICAJCS8qCj4gIAkJICogQ2FuJ3QgcmVsZWFzZSB0aGUgb3V0ZXJtb3N0IHJjdSBs b2NrIGluIGFuIGlycSBkaXNhYmxlZAo+ICAJCSAqIHNlY3Rpb24gd2l0aG91dCBwcmVlbXB0aW9u IGFsc28gYmVpbmcgZGlzYWJsZWQsIGlmIGlycXMKPiAtLSAKPiAyLjI1LjEKClNlYmFzdGlhbgoK X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KbGludXgtYXJt LWtlcm5lbCBtYWlsaW5nIGxpc3QKbGludXgtYXJtLWtlcm5lbEBsaXN0cy5pbmZyYWRlYWQub3Jn Cmh0dHA6Ly9saXN0cy5pbmZyYWRlYWQub3JnL21haWxtYW4vbGlzdGluZm8vbGludXgtYXJtLWtl cm5lbAo=