From nobody Thu Nov 28 21:32:26 2024 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D5379C4332F for ; Mon, 30 Oct 2023 08:45:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232267AbjJ3Ipc (ORCPT ); Mon, 30 Oct 2023 04:45:32 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46880 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232260AbjJ3Ip2 (ORCPT ); Mon, 30 Oct 2023 04:45:28 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C0E64AF for ; Mon, 30 Oct 2023 01:45:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=7iSC55MBBKbBPMjxq7D6a8mNZJA5wjULy8jPs4yPReM=; b=m6ia6yfwqNZzTS+R1U/3zWEn5h fNlVdPLoRa8mnyPLszt5TnImDcwUd1My193pN371ok3XUfe5nuNX24AHspVG3GR+7lzP2XqBmy1RL U8tw0sHzYir7/hKRc2JGUv0uQqwbq1PJUUZJjuyW85a7NZ0KhOEIO+QocUlyfOHo1Jwqk53UUYxh7 rw6FgGT1ZY24Y4DTw8SccBOFZQkSYJoHe18+aXguC39Z1lShnmYhgQaUbFOkixAMFQwA48oHCZ1Fr SNPx5kNI4dYoT5j+Hk6Lf0zK4rYojPgbyUesy8Jeyf5NOR/pOU3lkSZSQfT8XIu7HLm4JRXfSK1Ya bThFxrUg==; Received: from [2001:8b0:10b:5:9cbc:41e:b3e7:96ad] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1qxNtR-0034XF-UW; Mon, 30 Oct 2023 08:45:06 +0000 Message-ID: <2b8c36376fa01fa6a1bac9570eb7d41e7e232a29.camel@infradead.org> Subject: [PATCH v3] lockdep: add lockdep_cleanup_dead_cpu() From: David Woodhouse To: Thomas Gleixner , Peter Zijlstra , Ingo Molnar , Will Deacon , Waiman Long , Boqun Feng , linux-kernel Cc: Juergen Gross Date: Mon, 30 Oct 2023 08:45:05 +0000 In-Reply-To: <635fa006e8f3816b4a36b964d6281f0d8efa789b.camel@infradead.org> References: <635fa006e8f3816b4a36b964d6281f0d8efa789b.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-MjGvCDbu6s9yyae/hQ6Z" User-Agent: Evolution 3.44.4-0ubuntu2 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-MjGvCDbu6s9yyae/hQ6Z Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: David Woodhouse Add a function to check that an offline CPU left the tracing infrastructure in a sane state. The acpi_idle_play_dead() function was recently observed= =C2=B9 calling safe_halt() instead of raw_safe_halt(), which had the side-effect of setting the hardirqs_enabled flag for the offline CPU. On x86 this triggered lockdep warnings when the CPU came back online, but too early for the exception to be handled correctly, leading to a triple-fault. Add lockdep_cleanup_dead_cpu() to check for this kind of failure mode, print the events leading up to it, and correct it so that the CPU can come online again correctly. [ 61.556652] smpboot: CPU 1 is now offline [ 61.556769] CPU 1 left hardirqs enabled! [ 61.556915] irq event stamp: 128149 [ 61.556965] hardirqs last enabled at (128149): [] acp= i_idle_play_dead+0x46/0x70 [ 61.557055] hardirqs last disabled at (128148): [] do_= idle+0x90/0xe0 [ 61.557117] softirqs last enabled at (128078): [] __d= o_softirq+0x31c/0x423 [ 61.557199] softirqs last disabled at (128065): [] __i= rq_exit_rcu+0x91/0x100 =C2=B9 https://lore.kernel.org/lkml/a079bba5a0e47d6534b307553fc3772d26ce911= b.camel@infradead.org/ Signed-off-by: David Woodhouse Reviewed-by: Thomas Gleixner --- v3: Add forward declaration of struct task_struct. v2: Fix spelling. 'Offlone' wasn't quite what I meant to type. Add reference to ACPI patch. Fix kerneldoc args for lockdep_cleanup_dead_cpu() (thanks lkp) Closes: https://lore.kernel.org/oe-kbuild-all/202310290041.L5ndwcQ9-lkp= @intel.com/ include/linux/irqflags.h | 6 ++++++ kernel/cpu.c | 1 + kernel/locking/lockdep.c | 24 ++++++++++++++++++++++++ 3 files changed, 31 insertions(+) diff --git a/include/linux/irqflags.h b/include/linux/irqflags.h index 2b665c32f5fe..9b44f8b042a0 100644 --- a/include/linux/irqflags.h +++ b/include/linux/irqflags.h @@ -17,6 +17,8 @@ #include #include =20 +struct task_struct; + /* Currently lockdep_softirqs_on/off is used only by lockdep */ #ifdef CONFIG_PROVE_LOCKING extern void lockdep_softirqs_on(unsigned long ip); @@ -24,12 +26,16 @@ extern void lockdep_hardirqs_on_prepare(void); extern void lockdep_hardirqs_on(unsigned long ip); extern void lockdep_hardirqs_off(unsigned long ip); + extern void lockdep_cleanup_dead_cpu(unsigned int cpu, + struct task_struct *idle); #else static inline void lockdep_softirqs_on(unsigned long ip) { } static inline void lockdep_softirqs_off(unsigned long ip) { } static inline void lockdep_hardirqs_on_prepare(void) { } static inline void lockdep_hardirqs_on(unsigned long ip) { } static inline void lockdep_hardirqs_off(unsigned long ip) { } + static inline void lockdep_cleanup_dead_cpu(unsigned int cpu, + struct task_struct *idle) {} #endif =20 #ifdef CONFIG_TRACE_IRQFLAGS diff --git a/kernel/cpu.c b/kernel/cpu.c index 6de7c6bb74ee..225f5bc3708f 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -1371,6 +1371,7 @@ static int takedown_cpu(unsigned int cpu) =20 cpuhp_bp_sync_dead(cpu); =20 + lockdep_cleanup_dead_cpu(cpu, idle_thread_get(cpu)); tick_cleanup_dead_cpu(cpu); rcutree_migrate_callbacks(cpu); return 0; diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index e85b5ad3e206..62bfda8991b8 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -4538,6 +4538,30 @@ void lockdep_softirqs_off(unsigned long ip) debug_atomic_inc(redundant_softirqs_off); } =20 +/** + * lockdep_cleanup_dead_cpu - Ensure CPU lockdep state is cleanly stopped + * + * @cpu: index of offlined CPU + * @idle: task pointer for offlined CPU's idle thread + * + * Invoked after the CPU is dead. Ensures that the tracing infrastructure + * is left in a suitable state for the CPU to be subsequently brought + * online again. + */ +void lockdep_cleanup_dead_cpu(unsigned int cpu, struct task_struct *idle) +{ + if (unlikely(!debug_locks)) + return; + + if (unlikely(per_cpu(hardirqs_enabled, cpu))) { + pr_warn("CPU %u left hardirqs enabled!", cpu); + if (idle) + print_irqtrace_events(idle); + /* Clean it up for when the CPU comes online again. */ + per_cpu(hardirqs_enabled, cpu) =3D 0; + } +} + static int mark_usage(struct task_struct *curr, struct held_lock *hlock, int check) { --=20 2.41.0 --=-MjGvCDbu6s9yyae/hQ6Z Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG 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