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=-5.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, 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 AD012C10F27 for ; Wed, 11 Mar 2020 09:14:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8A92B2146E for ; Wed, 11 Mar 2020 09:14:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728245AbgCKJOB convert rfc822-to-8bit (ORCPT ); Wed, 11 Mar 2020 05:14:01 -0400 Received: from mail-wr1-f65.google.com ([209.85.221.65]:40522 "EHLO mail-wr1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726097AbgCKJOB (ORCPT ); Wed, 11 Mar 2020 05:14:01 -0400 Received: by mail-wr1-f65.google.com with SMTP id p2so1548754wrw.7 for ; Wed, 11 Mar 2020 02:13:59 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:user-agent:in-reply-to:references :mime-version:content-transfer-encoding:subject:to:cc:from :message-id; bh=xsSU+80Y3lxtivrqrvbzy5IJmkkrb659KNbVYST+ACI=; b=IFOsCCE2tqs8vx0LM5wU6CBztdfLg8u2Yup4/1hoWnbdB8GRQnXPqJAupS00fKh0SQ gyW5ONhZFoGqUClx+6WidjOaeLvCqHarhro1Wih52JXWfB6iGxVH1NIhpmyNjVfcLScE OysFcgv0gnUrFxRa7VeRmv2YlTf7HzOiMUCrOJeeW//iZiZzHLRhVFPwy5TYk6vldHUV JcuAeJTEMtx4feucRB1uHuJj5AbSV4J2ovEcstxrGHRhHmvNqpUUhqu575E2EEh4EpDQ MfHaayirdiHL3P1RzvQ7rEo5ifv+yLeZsajyiuBLsdIj7YjD3KRcXfauNIRYJgO7Aj7k WCLA== X-Gm-Message-State: ANhLgQ0S0OZ0xfTq4oyY0UQL1q14jAtzfaJEbgiQDF2NiqmUOdluHYjz 1z6bBN+7PFBl7n8pPgJ3LLPVBQ== X-Google-Smtp-Source: ADFU+vsYf1KquYfcemf3FjAgci4KByuaitL3xBXGeBCd9SxaaK7D/ZsYeNmplABcK3CkkFJDnRTDxQ== X-Received: by 2002:a5d:42c8:: with SMTP id t8mr3390174wrr.415.1583918039172; Wed, 11 Mar 2020 02:13:59 -0700 (PDT) Received: from Google-Pixel-3a.fritz.box (ip5f5bf7ec.dynamic.kabel-deutschland.de. [95.91.247.236]) by smtp.gmail.com with ESMTPSA id f127sm7782162wma.4.2020.03.11.02.13.58 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 11 Mar 2020 02:13:58 -0700 (PDT) Date: Wed, 11 Mar 2020 10:13:57 +0100 User-Agent: K-9 Mail for Android In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8BIT Subject: Re: WARNING: at refcount.c:190 refcount_sub_and_test_checked+0xac/0xc8 - refcount_t: underflow; use-after-free. To: Naresh Kamboju , "open list:KERNEL SELFTEST FRAMEWORK" , open list CC: John Stultz , tkjos@google.com, Shuah Khan , Greg Kroah-Hartman , Ard Biesheuvel , ardb@kernel.org, Kees Cook , lkft-triage@lists.linaro.org From: Christian Brauner Message-ID: Sender: linux-kselftest-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org On March 11, 2020 8:52:16 AM GMT+01:00, Naresh Kamboju wrote: >While running selftest binderfs_test on linux mainline the following >warning on arm64, arm, x86_64 and i386. > >[ 329.383391] refcount_t: underflow; use-after-free. >[ 329.391025] WARNING: CPU: 0 PID: 2604 at >/usr/src/kernel/lib/refcount.c:28 refcount_warn_saturate+0xd4/0x150 >[ 329.403319] Modules linked in: cls_bpf sch_fq algif_hash af_alg >rfkill tda998x drm_kms_helper drm crct10dif_ce fuse >[ 329.413828] CPU: 0 PID: 2604 Comm: binderfs_test Not tainted >5.6.0-rc5 #1 >[ 329.420640] Hardware name: ARM Juno development board (r2) (DT) >[ 329.426584] pstate: 40000005 (nZcv daif -PAN -UAO) >[ 329.431402] pc : refcount_warn_saturate+0xd4/0x150 >[ 329.436216] lr : refcount_warn_saturate+0xd4/0x150 >[ 329.441026] sp : ffff800013d03a70 >[ 329.444356] x29: ffff800013d03a70 x28: ffff00092c3f8000 >[ 329.449694] x27: 0000000000000000 x26: ffff80001236f000 >[ 329.455033] x25: ffff800012656000 x24: 0000000000000001 >[ 329.460371] x23: ffff800012656f76 x22: ffff80001265b2c0 >[ 329.465709] x21: ffff000929035c00 x20: ffff00095cd8ce00 >[ 329.471048] x19: ffff80001261c848 x18: ffffffffffffffff >[ 329.476386] x17: 0000000000000000 x16: 0000000000000000 >[ 329.481724] x15: ffff80001236fa88 x14: ffff800093d03767 >[ 329.487062] x13: ffff800013d03775 x12: ffff80001239e000 >[ 329.492400] x11: 0000000005f5e0ff x10: ffff800013d03700 >[ 329.497738] x9 : ffff8000126ddc68 x8 : 0000000000000028 >[ 329.503076] x7 : ffff800010190a5c x6 : ffff00097ef0b428 >[ 329.508414] x5 : ffff00097ef0b428 x4 : ffff00092c3f8000 >[ 329.513752] x3 : ffff800012370000 x2 : 0000000000000000 >[ 329.519090] x1 : 295161095161e100 x0 : 0000000000000000 >[ 329.524429] Call trace: >[ 329.526894] refcount_warn_saturate+0xd4/0x150 >[ 329.531362] binderfs_evict_inode+0xcc/0xe8 >[ 329.535567] evict+0xa8/0x188 >[ 329.538552] iput+0x278/0x318 >[ 329.541537] dentry_unlink_inode+0x154/0x170 >[ 329.545827] __dentry_kill+0xc4/0x1d8 >[ 329.549509] shrink_dentry_list+0xf4/0x210 >[ 329.553625] shrink_dcache_parent+0x124/0x210 >[ 329.558002] do_one_tree+0x20/0x50 >[ 329.561423] shrink_dcache_for_umount+0x30/0x98 >[ 329.565975] generic_shutdown_super+0x2c/0xf8 >[ 329.570354] kill_anon_super+0x24/0x48 >[ 329.574122] kill_litter_super+0x2c/0x38 >[ 329.578065] binderfs_kill_super+0x24/0x48 >[ 329.582182] deactivate_locked_super+0x74/0xa0 >[ 329.586647] deactivate_super+0x8c/0x98 >[ 329.590502] cleanup_mnt+0xd8/0x130 >[ 329.594008] __cleanup_mnt+0x20/0x30 >[ 329.597605] task_work_run+0x90/0x150 >[ 329.601287] do_notify_resume+0x130/0x498 >[ 329.605317] work_pending+0x8/0x14 >[ 329.608736] irq event stamp: 1612 >[ 329.612072] hardirqs last enabled at (1611): [] >console_unlock+0x514/0x5d8 >[ 329.620631] hardirqs last disabled at (1612): [] >debug_exception_enter+0xac/0xe8 >[ 329.629622] softirqs last enabled at (1608): [] >__do_softirq+0x4c4/0x578 >[ 329.638005] softirqs last disabled at (1561): [] >irq_exit+0x144/0x150 >[ 329.646035] ---[ end trace bac6584738d9306f ]--- > >Metadata: >--------------- > git branch: master >git repo: >https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git > git describe: v5.6-rc5 > kernel-config: >http://snapshots.linaro.org/openembedded/lkft/lkft/sumo/intel-corei7-64/lkft/linux-mainline/2518/config > >Full test log, >https://lkft.validation.linaro.org/scheduler/job/1273667#L6591 >https://lkft.validation.linaro.org/scheduler/job/1273569#L6222 >https://lkft.validation.linaro.org/scheduler/job/1273548#L6126 >https://lkft.validation.linaro.org/scheduler/job/1273596#L4687 Thanks, I'll take a look in a little bit.