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=-20.8 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,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS 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 5DEA8C433B4 for ; Thu, 6 May 2021 07:20:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1FF4D60232 for ; Thu, 6 May 2021 07:20:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233369AbhEFHVE (ORCPT ); Thu, 6 May 2021 03:21:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35910 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233127AbhEFHVD (ORCPT ); Thu, 6 May 2021 03:21:03 -0400 Received: from mail-wr1-x435.google.com (mail-wr1-x435.google.com [IPv6:2a00:1450:4864:20::435]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 602E3C061574 for ; Thu, 6 May 2021 00:20:05 -0700 (PDT) Received: by mail-wr1-x435.google.com with SMTP id m9so4441282wrx.3 for ; Thu, 06 May 2021 00:20:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=cr7Isl4uulgxjmAqUcuO2+t5PPEbu1o+EkbpfXpE+BY=; b=L6C2Y7DoaPWMOuRhGLWPKWMX+R+v3XTwKZXv7yubXzqC0LvwtA4T1aVV6HKGfwKcji NoJI2CaC5rxJX97Q8GQaJfEjTfnjIlEaI3Xd17M5uR+40dDhlGvekuGs87pNPIbexxgo rKGus8hLiNXEMfp9j9dzwSoIDO2JJMkh7T8rOI8Dt8rZFb6L+rIMXkjbl4QchJk3BYJw TA7JoJCXEfFJCkzV0EqoS4tlqU4nJbYbR3+JFpTZn0TGu3jqXx28cxCnkT/IR5bodaQx sV6jj7Q29fUGkJZHzjyCC+xiqnjGl03sXsHuZblBZGp3CgtZyk4hrCM+Oz0ONmzpfuEp dkug== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=cr7Isl4uulgxjmAqUcuO2+t5PPEbu1o+EkbpfXpE+BY=; b=LDwpOxRhx7mEccXg+FySH/slO5fTm3kPS/mob5E+2xSAMY3et7PVkthFhp49grU6Do j9oU+lu5hoTjoERB+nw1qwUkidjU2WoEoHN3eVhXbNHZUO1oOAyWE/+SpEAMNCN9bqa9 z2fFrDbm9bJXC34+tJ6u9rv2YMi6TmPzFaJrU7H7tvlz/jw0mdeAU7lLmajd6CVvPsXp XHpxh0DmP83KY6hLKkJKUt8CW/IqrEbAdkHhUy6e3bOrVyJqPOibk35VxE2miowvKaqm t53s02YhOet4HSDWE9bWSI3VN4Qg2RS6aelQ4fbqr519j8XXr0jiZckXcLt2aF22qves tfTg== X-Gm-Message-State: AOAM532rz2vTBlwmG/3c+8tjFL/AoB01mA1C4vMepHnCMgdgk7mnmuSI DEGdHHQZpOhxMwT7Dg/0EY33cKbEoU3rl0kw35JbaQ== X-Google-Smtp-Source: ABdhPJydbuUC2QzP6GlVHrLClTGQnYCaLGpUf+NIZUs2bjvQti0iPGyDM1tg/Qoxv9LloFiUSQ9rZ09icigep3WZB/U= X-Received: by 2002:adf:e552:: with SMTP id z18mr3141238wrm.226.1620285604009; Thu, 06 May 2021 00:20:04 -0700 (PDT) MIME-Version: 1.0 References: <20210225090610.242623-1-allen.lkml@gmail.com> <20210225090610.242623-2-allen.lkml@gmail.com> <9a6c017c-d156-f939-f907-d6dfe83c41ac@linux.microsoft.com> <409F60D9-F0FB-4B69-B64B-CC6B3704038E@linux.microsoft.com> <51FC863B-96C5-47BA-8EBF-3D9FB6DE7DD2@linux.microsoft.com> In-Reply-To: <51FC863B-96C5-47BA-8EBF-3D9FB6DE7DD2@linux.microsoft.com> From: Jens Wiklander Date: Thu, 6 May 2021 09:19:53 +0200 Message-ID: Subject: Re: [PATCH v2 1/2] optee: fix tee out of memory failure seen during kexec reboot To: Allen Pais Cc: Allen Pais , zajec5@gmail.com, bcm-kernel-feedback-list@broadcom.com, Linux ARM , Linux Kernel Mailing List , OP-TEE TrustedFirmware Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, May 6, 2021 at 9:10 AM Allen Pais wrote= : > > > >>>>>> [ 0.368428] tee_bnxt_fw optee-clnt0: tee_shm_alloc failed > >>>>>> [ 0.368461] tee_bnxt_fw: probe of optee-clnt0 failed with error= -22 > >>>>>> > >>>>>> tee_shm_release() is not invoked on dma shm buffer. > >>>>>> > >>>>>> Implement .shutdown() method to handle the release of the buffers > >>>>>> correctly. > >>>>>> > >>>>>> More info: > >>>>>> https://github.com/OP-TEE/optee_os/issues/3637 > >>>>>> > >>>>>> Signed-off-by: Allen Pais > >>>>>> --- > >>>>>> drivers/tee/optee/core.c | 20 ++++++++++++++++++++ > >>>>>> 1 file changed, 20 insertions(+) > >>>>> > >>>>> This looks good to me. Do you have a practical way of testing this = on > >>>>> QEMU for instance? > >>>>> > >>>> > >>>> Jens, > >>>> > >>>> I could not reproduce nor create a setup using QEMU, I could only > >>>> do it on a real h/w. > >>>> > >>>> I have extensively tested the fix and I don't see any issues. > >>> > >>> I did a few test runs too, seems OK. > >> > >> I carried these changes and have not run into any issues with Kexec so= far. > >> Last week, while trying out kdump, we ran into a crash(this is when th= e > >> Kdump kernel reboots). > >> > >> $echo c > /proc/sysrq-trigger > >> > >> Leads to: > >> > >> [ 18.004831] Unable to handle kernel paging request at virtual addre= ss ffff0008dcef6758 > >> [ 18.013002] Mem abort info: > >> [ 18.015885] ESR =3D 0x96000005 > >> [ 18.019034] EC =3D 0x25: DABT (current EL), IL =3D 32 bits > >> [ 18.024516] SET =3D 0, FnV =3D 0 > >> [ 18.027667] EA =3D 0, S1PTW =3D 0 > >> [ 18.030905] Data abort info: > >> [ 18.033877] ISV =3D 0, ISS =3D 0x00000005 > >> [ 18.037835] CM =3D 0, WnR =3D 0 > >> [ 18.040896] swapper pgtable: 4k pages, 48-bit VAs, pgdp=3D000000097= 0a78000 > >> [ 18.047811] [ffff0008dcef6758] pgd=3D000000097fbf9003, pud=3D000000= 0000000000 > >> [ 18.054819] Internal error: Oops: 96000005 [#1] SMP > >> [ 18.059850] Modules linked in: bnxt_en pcie_iproc_platform pcie_ipr= oc diagbe(O) > >> [ 18.067395] CPU: 3 PID: 1 Comm: systemd-shutdow Tainted: G = O 5.4.83-microsoft-standard #1 > >> [ 18.077174] Hardware name: Overlake (DT) > >> [ 18.081219] pstate: 80400005 (Nzcv daif +PAN -UAO) > >> [ 18.086170] pc : tee_shm_free+0x18/0x48 > >> [ 18.090126] lr : optee_disable_shm_cache+0xa4/0xf0 > >> [ 18.095066] sp : ffff80001005bb90 > >> [ 18.098484] x29: ffff80001005bb90 x28: ffff000037e20000 > >> [ 18.103962] x27: 0000000000000000 x26: ffff00003ed10490 > >> [ 18.109440] x25: ffffca760e975f90 x24: 0000000000000000 > >> [ 18.114918] x23: ffffca760ed79808 x22: ffff00003ec66e18 > >> [ 18.120396] x21: ffff80001005bc08 x20: 00000000b200000a > >> [ 18.125874] x19: ffff0008dcef6700 x18: 0000000000000010 > >> [ 18.131352] x17: 0000000000000000 x16: 0000000000000000 > >> [ 18.136829] x15: ffffffffffffffff x14: ffffca760ed79808 > >> [ 18.142307] x13: ffff80009005b897 x12: ffff80001005b89f > >> [ 18.147786] x11: ffffca760eda4000 x10: ffff80001005b820 > >> [ 18.153264] x9 : 00000000ffffffd0 x8 : ffffca760e59b2c0 > >> [ 18.158742] x7 : 0000000000000000 x6 : 0000000000000000 > >> [ 18.164220] x5 : 0000000000000000 x4 : 0000000000000000 > >> [ 18.169698] x3 : 0000000000000000 x2 : ffff0008dcef6700 > >> [ 18.175175] x1 : 00000000ffff0008 x0 : ffffca760e59ca04 > >> [ 18.180654] Call trace: > >> [ 18.183176] tee_shm_free+0x18/0x48 > >> [ 18.186773] optee_disable_shm_cache+0xa4/0xf0 > >> [ 18.191356] optee_shutdown+0x20/0x30 > >> [ 18.195135] platform_drv_shutdown+0x2c/0x38 > >> [ 18.199538] device_shutdown+0x180/0x298 > >> [ 18.203586] kernel_restart_prepare+0x44/0x50 > >> [ 18.208078] kernel_restart+0x20/0x68 > >> [ 18.211853] __do_sys_reboot+0x104/0x258 > >> [ 18.215899] __arm64_sys_reboot+0x2c/0x38 > >> [ 18.220035] el0_svc_handler+0x90/0x138 > >> [ 18.223991] el0_svc+0x8/0x208 > >> [ 18.227143] Code: f9000bf3 aa0003f3 aa1e03e0 d503201f (b9405a60) > >> [ 18.233435] ---[ end trace 835d756cd66aa959 ]--- > >> [ 18.238621] Kernel panic - not syncing: Fatal exception > >> [ 18.244014] Kernel Offset: 0x4a75fde00000 from 0xffff800010000000 > >> [ 18.250299] PHYS_OFFSET: 0xffff99c680000000 > >> [ 18.254613] CPU features: 0x0002,21806008 > >> [ 18.258747] Memory Limit: none > >> [ 18.262310] ---[ end Kernel panic - not syncing: Fatal exception ]= =E2=80=94 > >> > >> I see that before secure world returns OPTEE_SMC_RETURN_ENOTAVAIL(whic= h > >> Should disable and clear all the cache) we run into the crash trying t= o free shm. > >> > >> Thoughts? > > > > It seems that the pointer is invalid, but the pointer doesn't look > > like garbage. Could the kernel have unmapped the memory area covering > > that address? > > > > Yes, I am not entirely sure if the kernel had the time to unmap the memo= ry. > Right after triggering the crash the kdump kernel is booted and I see the= following > > [ 2.050145] optee: probing for conduit method. > [ 2.054743] optee: revision 3.6 (f84427aa) > [ 2.054821] optee: dynamic shared memory is enabled > [ 2.066186] optee: initialized driver > > Could this be previous un-released maps causing corruption? Aha, yes, that could be it. Cheers, Jens 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=-19.4 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,MENTIONS_GIT_HOSTING,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 2703EC433ED for ; Thu, 6 May 2021 07:22:47 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (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 73B3361164 for ; Thu, 6 May 2021 07:22:46 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 73B3361164 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X-Received: by 2002:adf:e552:: with SMTP id z18mr3141238wrm.226.1620285604009; Thu, 06 May 2021 00:20:04 -0700 (PDT) MIME-Version: 1.0 References: <20210225090610.242623-1-allen.lkml@gmail.com> <20210225090610.242623-2-allen.lkml@gmail.com> <9a6c017c-d156-f939-f907-d6dfe83c41ac@linux.microsoft.com> <409F60D9-F0FB-4B69-B64B-CC6B3704038E@linux.microsoft.com> <51FC863B-96C5-47BA-8EBF-3D9FB6DE7DD2@linux.microsoft.com> In-Reply-To: <51FC863B-96C5-47BA-8EBF-3D9FB6DE7DD2@linux.microsoft.com> From: Jens Wiklander Date: Thu, 6 May 2021 09:19:53 +0200 Message-ID: Subject: Re: [PATCH v2 1/2] optee: fix tee out of memory failure seen during kexec reboot To: Allen Pais Cc: Allen Pais , zajec5@gmail.com, bcm-kernel-feedback-list@broadcom.com, Linux ARM , Linux Kernel Mailing List , OP-TEE TrustedFirmware X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210506_002006_140411_B94A00BE X-CRM114-Status: GOOD ( 27.22 ) 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 T24gVGh1LCBNYXkgNiwgMjAyMSBhdCA5OjEwIEFNIEFsbGVuIFBhaXMgPGFwYWlzQGxpbnV4Lm1p Y3Jvc29mdC5jb20+IHdyb3RlOgo+Cj4KPiA+Pj4+Pj4gWyAgICAwLjM2ODQyOF0gdGVlX2JueHRf Zncgb3B0ZWUtY2xudDA6IHRlZV9zaG1fYWxsb2MgZmFpbGVkCj4gPj4+Pj4+IFsgICAgMC4zNjg0 NjFdIHRlZV9ibnh0X2Z3OiBwcm9iZSBvZiBvcHRlZS1jbG50MCBmYWlsZWQgd2l0aCBlcnJvciAt MjIKPiA+Pj4+Pj4KPiA+Pj4+Pj4gdGVlX3NobV9yZWxlYXNlKCkgaXMgbm90IGludm9rZWQgb24g ZG1hIHNobSBidWZmZXIuCj4gPj4+Pj4+Cj4gPj4+Pj4+IEltcGxlbWVudCAuc2h1dGRvd24oKSBt ZXRob2QgdG8gaGFuZGxlIHRoZSByZWxlYXNlIG9mIHRoZSBidWZmZXJzCj4gPj4+Pj4+IGNvcnJl Y3RseS4KPiA+Pj4+Pj4KPiA+Pj4+Pj4gTW9yZSBpbmZvOgo+ID4+Pj4+PiBodHRwczovL2dpdGh1 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