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[2620:137:e000::1:20]) by mx.google.com with ESMTP id b10-20020a631b0a000000b0055fec018757si3617793pgb.152.2023.07.19.10.33.19; Wed, 19 Jul 2023 10:33:31 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@broadcom.com header.s=google header.b=fjbLHIh+; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=broadcom.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231296AbjGSROb (ORCPT + 99 others); Wed, 19 Jul 2023 13:14:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50138 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231251AbjGSRO3 (ORCPT ); Wed, 19 Jul 2023 13:14:29 -0400 Received: from mail-pf1-x42b.google.com (mail-pf1-x42b.google.com [IPv6:2607:f8b0:4864:20::42b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 03BBE172E for ; Wed, 19 Jul 2023 10:14:28 -0700 (PDT) Received: by mail-pf1-x42b.google.com with SMTP id d2e1a72fcca58-6689430d803so4882141b3a.0 for ; Wed, 19 Jul 2023 10:14:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; t=1689786867; x=1690391667; h=in-reply-to:from:references:cc:to:subject:user-agent:mime-version :date:message-id:from:to:cc:subject:date:message-id:reply-to; bh=Qalv+Q4Ug8+K0+0tgKoGeHLaBY2cykE7CA2ZTIz7x+E=; b=fjbLHIh+EQ6yGJ6KwjuQjH9u49mhnDY/cL6wkusFHEQFvPuzqghxU+duCkcdjXIftQ 2PfL0LMLa3P4RwAD82HDbH9I86LuvqkpppCSJQcm2GuZOMSVtAQYKMfVRZkZn2Y7lLdV f1/9JPz6rjujr9kjEDilF5gbBGpG/AlPXwAV0= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1689786867; x=1690391667; h=in-reply-to:from:references:cc:to:subject:user-agent:mime-version :date:message-id:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=Qalv+Q4Ug8+K0+0tgKoGeHLaBY2cykE7CA2ZTIz7x+E=; b=cDIjShOOAOkKLiSG/8BA7oiZJRmpAv6EeUkKDwqi3NAhSQ/As6F1UvrG0yWYQm9Gu/ NH9k0mpZS3JTR6u6rc8NFk/tMNT6cisuw30AWyxhCgvR6eXb0VM3UMrrzGEY9aYy7gQz AOLWFNnTIwRdOGygK/BAoOeQAmw3UxHMyBD9wYGVa6NgjWrGpx7TwstNGjItrhfD3XbQ ZP0AKAxgSYuuE2NKhZRsmEzr5py1gdVkZC8fJvrhBkDNmrUQdybbleSWCDMSBChnpb+6 sjGsV3weOljxowrB3PBPjQ0wcaqyZShKnZZQ+bmga9ybeIF3ouHrkUcu3ugCoQ+0GBem hiHw== X-Gm-Message-State: ABy/qLZ4vLKZpDzIBwm3uYCUbhYJt9yKF24FDuqRQe9TWkx3bHyr5MYv cyIsO0zI2UzIXFY9xoudDlpHog== X-Received: by 2002:a05:6a20:3d15:b0:127:72c3:fd60 with SMTP id y21-20020a056a203d1500b0012772c3fd60mr111783pzi.1.1689786867395; Wed, 19 Jul 2023 10:14:27 -0700 (PDT) Received: from [10.136.13.65] ([192.19.161.248]) by smtp.gmail.com with ESMTPSA id x3-20020a170902ea8300b001b895336435sm4271659plb.21.2023.07.19.10.14.26 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 19 Jul 2023 10:14:27 -0700 (PDT) Message-ID: <873b7f79-6049-a5fc-f64c-f2c5c09c43ce@broadcom.com> Date: Wed, 19 Jul 2023 10:10:45 -0700 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.11.0 Subject: Re: [PATCH v3] misc: bcm_vk: Fix potential deadlock on &vk->ctx_lock To: Chengfeng Ye , bcm-kernel-feedback-list@broadcom.com, arnd@arndb.de, gregkh@linuxfoundation.org Cc: linux-kernel@vger.kernel.org References: <20230629182941.13045-1-dg573847474@gmail.com> From: Scott Branden In-Reply-To: <20230629182941.13045-1-dg573847474@gmail.com> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000ffca330600da2985" X-Spam-Status: No, score=-2.2 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,NICE_REPLY_A, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE, URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --000000000000ffca330600da2985 Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Works fine. Corrected Acked-by and Tested-by below. On 2023-06-29 11:29, Chengfeng Ye wrote: > As &vk->ctx_lock is acquired by timer bcm_vk_hb_poll() under softirq > context, other process context code should disable irq or bottom-half > before acquire the same lock, otherwise deadlock could happen if the > timer preempt the execution while the lock is held in process context > on the same CPU. > > Possible deadlock scenario > bcm_vk_open() > -> bcm_vk_get_ctx() > -> spin_lock(&vk->ctx_lock) > > -> bcm_vk_hb_poll() > -> bcm_vk_blk_drv_access() > -> spin_lock_irqsave(&vk->ctx_lock, flags) (deadlock here) > > This flaw was found using an experimental static analysis tool we are > developing for irq-related deadlock, which reported the following > warning when analyzing the linux kernel 6.4-rc7 release. > > [Deadlock]: &vk->ctx_lock > [Interrupt]: bcm_vk_hb_poll > -->/root/linux/drivers/misc/bcm-vk/bcm_vk_msg.c:176 > -->/root/linux/drivers/misc/bcm-vk/bcm_vk_dev.c:512 > [Locking Unit]: bcm_vk_ioctl > -->/root/linux/drivers/misc/bcm-vk/bcm_vk_dev.c:1181 > -->/root/linux/drivers/misc/bcm-vk/bcm_vk_dev.c:512 > > [Deadlock]: &vk->ctx_lock > [Interrupt]: bcm_vk_hb_poll > -->/root/linux/drivers/misc/bcm-vk/bcm_vk_msg.c:176 > -->/root/linux/drivers/misc/bcm-vk/bcm_vk_dev.c:512 > [Locking Unit]: bcm_vk_ioctl > -->/root/linux/drivers/misc/bcm-vk/bcm_vk_dev.c:1169 > > [Deadlock]: &vk->ctx_lock > [Interrupt]: bcm_vk_hb_poll > -->/root/linux/drivers/misc/bcm-vk/bcm_vk_msg.c:176 > -->/root/linux/drivers/misc/bcm-vk/bcm_vk_dev.c:512 > [Locking Unit]: bcm_vk_open > -->/root/linux/drivers/misc/bcm-vk/bcm_vk_msg.c:216 > > [Deadlock]: &vk->ctx_lock > [Interrupt]: bcm_vk_hb_poll > -->/root/linux/drivers/misc/bcm-vk/bcm_vk_msg.c:176 > -->/root/linux/drivers/misc/bcm-vk/bcm_vk_dev.c:512 > [Locking Unit]: bcm_vk_release > -->/root/linux/drivers/misc/bcm-vk/bcm_vk_msg.c:306 > > As suggested by Arnd, the tentative patch fix the potential deadlocks > by replacing the timer with delay workqueue. x86_64 allyesconfig using > GCC shows no new warning. Note that no runtime testing was performed > due to no device on hand. > > Signed-off-by: Chengfeng Ye Acked-by: Scott Branden Tested-by: Desmond Yan > --- > drivers/misc/bcm-vk/bcm_vk.h | 2 +- > drivers/misc/bcm-vk/bcm_vk_msg.c | 14 +++++++------- > 2 files changed, 8 insertions(+), 8 deletions(-) > > diff --git a/drivers/misc/bcm-vk/bcm_vk.h b/drivers/misc/bcm-vk/bcm_vk.h > index 25d51222eedf..386884c2a263 100644 > --- a/drivers/misc/bcm-vk/bcm_vk.h > +++ b/drivers/misc/bcm-vk/bcm_vk.h > @@ -340,7 +340,7 @@ struct bcm_vk_proc_mon_info { > }; > > struct bcm_vk_hb_ctrl { > - struct timer_list timer; > + struct delayed_work work; > u32 last_uptime; > u32 lost_cnt; > }; > diff --git a/drivers/misc/bcm-vk/bcm_vk_msg.c b/drivers/misc/bcm-vk/bcm_vk_msg.c > index 3c081504f38c..e17d81231ea6 100644 > --- a/drivers/misc/bcm-vk/bcm_vk_msg.c > +++ b/drivers/misc/bcm-vk/bcm_vk_msg.c > @@ -137,11 +137,11 @@ void bcm_vk_set_host_alert(struct bcm_vk *vk, u32 bit_mask) > #define BCM_VK_HB_TIMER_VALUE (BCM_VK_HB_TIMER_S * HZ) > #define BCM_VK_HB_LOST_MAX (27 / BCM_VK_HB_TIMER_S) > > -static void bcm_vk_hb_poll(struct timer_list *t) > +static void bcm_vk_hb_poll(struct work_struct *work) > { > u32 uptime_s; > - struct bcm_vk_hb_ctrl *hb = container_of(t, struct bcm_vk_hb_ctrl, > - timer); > + struct bcm_vk_hb_ctrl *hb = container_of(to_delayed_work(work), struct bcm_vk_hb_ctrl, > + work); > struct bcm_vk *vk = container_of(hb, struct bcm_vk, hb_ctrl); > > if (bcm_vk_drv_access_ok(vk) && hb_mon_is_on()) { > @@ -177,22 +177,22 @@ static void bcm_vk_hb_poll(struct timer_list *t) > bcm_vk_set_host_alert(vk, ERR_LOG_HOST_HB_FAIL); > } > /* re-arm timer */ > - mod_timer(&hb->timer, jiffies + BCM_VK_HB_TIMER_VALUE); > + schedule_delayed_work(&hb->work, BCM_VK_HB_TIMER_VALUE); > } > > void bcm_vk_hb_init(struct bcm_vk *vk) > { > struct bcm_vk_hb_ctrl *hb = &vk->hb_ctrl; > > - timer_setup(&hb->timer, bcm_vk_hb_poll, 0); > - mod_timer(&hb->timer, jiffies + BCM_VK_HB_TIMER_VALUE); > + INIT_DELAYED_WORK(&hb->work, bcm_vk_hb_poll); > + schedule_delayed_work(&hb->work, BCM_VK_HB_TIMER_VALUE); > } > > void bcm_vk_hb_deinit(struct bcm_vk *vk) > { > struct bcm_vk_hb_ctrl *hb = &vk->hb_ctrl; > > - del_timer(&hb->timer); > + cancel_delayed_work_sync(&hb->work); > } > > static void bcm_vk_msgid_bitmap_clear(struct bcm_vk *vk, --000000000000ffca330600da2985 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIQcAYJKoZIhvcNAQcCoIIQYTCCEF0CAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg gg3HMIIFDTCCA/WgAwIBAgIQeEqpED+lv77edQixNJMdADANBgkqhkiG9w0BAQsFADBMMSAwHgYD VQQLExdHbG9iYWxTaWduIFJvb3QgQ0EgLSBSMzETMBEGA1UEChMKR2xvYmFsU2lnbjETMBEGA1UE AxMKR2xvYmFsU2lnbjAeFw0yMDA5MTYwMDAwMDBaFw0yODA5MTYwMDAwMDBaMFsxCzAJBgNVBAYT AkJFMRkwFwYDVQQKExBHbG9iYWxTaWduIG52LXNhMTEwLwYDVQQDEyhHbG9iYWxTaWduIEdDQyBS 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