From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: ARC-Seal: i=1; a=rsa-sha256; t=1517385590; cv=none; d=google.com; s=arc-20160816; b=pEN2plkxbXgcP5+ma4lBeyTRcWPQguxFnp2LOXOn71+FkTOB1vq2bzTYo0fDpYwfpw X6gvzC0ghXCB55C9sLdINnh/MDd8JLlIyZxa/O0FzvQ4uRZ8YEhP1CSCr6dq6HLqyNge imXMM+1Ay9bBIM6448P9CGAbR/anZrUH2dhsmRNIE0b3iCg6uR24ZoShHU9rq0Sk5JAU ZKKfy8u6TAxP4/CmNwixRbXRvNm1PgNVbt5XYJ1oY3jyP0qHy8cq2pUuri7O+38u9LvQ m2ZCJ6H9wcAoI4PjHN7gCw/0IcwK40Vj5ztHEDtlqA7oWPEFtbQ7/Alxv8xcPbVCZvXK eCdg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=user-agent:in-reply-to:content-disposition:mime-version:references :message-id:subject:cc:to:from:date:dkim-signature :arc-authentication-results; bh=G3heV79utc2ieip0e3+8r7mvEppVKxlPtjVwYsHxUDM=; b=Ckhivhwor1ttmZD+j4/ENimT0tMdWqQhhibIyYpH5vvnp5zxlb5f3nl/yYs86rV2O/ /IV7EK3e44SxE76bKlhp8Uvfqp1mnCketIzoXnMnQ7ou7o3ysdToYgyW7wrFcDywQXqb 3VlB9rcSJZLxHje2BQGa3YumVSI4lelGqlBo7I+2oh9D8KWmEHbI/D6A7mCYWaPIPwlx 5Zwmc8uIrv987bKB/oABcTXr3lo8g71iS2kqRA9QO/jXNHd3iz5flTavJfo61hlWJleW O2e6SEMJxfxTRkhmqMpzBtb+/JQp8VZwVtl//4mzgk7M4jYFe9Cp09U25fDYOJnMcrWS NQ9w== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=V5i6K+/n; spf=pass (google.com: domain of ebiggers3@gmail.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=ebiggers3@gmail.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=gmail.com Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=V5i6K+/n; spf=pass (google.com: domain of ebiggers3@gmail.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=ebiggers3@gmail.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=gmail.com X-Google-Smtp-Source: AH8x224Kc0hElk37ioESQB4QxccLpoN11MvmJeatuxzyD5mdAQScFUjsGQjxb/EB62Ls05i0uJqvXA== Date: Tue, 30 Jan 2018 23:59:47 -0800 From: Eric Biggers To: syzbot Cc: arve@android.com, devel@driverdev.osuosl.org, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, riandrews@android.com, syzkaller-bugs@googlegroups.com, Martijn Coenen Subject: Re: kernel BUG at drivers/android/binder_alloc.c:LINE! Message-ID: <20180131075947.GG2736@zzz.localdomain> References: <94eb2c111b8cc9b724055f4999a7@google.com> <001a1145ee704e6c33055f50798d@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <001a1145ee704e6c33055f50798d@google.com> User-Agent: Mutt/1.9.3 (2018-01-21) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1585598537470221646?= X-GMAIL-MSGID: =?utf-8?q?1591094112756620395?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: On Fri, Dec 01, 2017 at 04:22:00PM -0800, syzbot wrote: > syzkaller has found reproducer for the following crash on > 3c1c4ddffb58b9e10b3365764fe59546130b3f32 > git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master > compiler: gcc (GCC) 7.1.1 20170620 > .config is attached > Raw console output is attached. > C reproducer is attached > syzkaller reproducer is attached. See https://goo.gl/kgGztJ > for information about syzkaller reproducers > > > binder: 3087:3087 ERROR: BC_REGISTER_LOOPER called without request > binder: 3087:3087 ioctl c0306201 2000dfd0 returned -14 > ------------[ cut here ]------------ > kernel BUG at drivers/android/binder_alloc.c:750! > invalid opcode: 0000 [#1] SMP KASAN > Dumping ftrace buffer: > (ftrace buffer empty) > Modules linked in: > CPU: 0 PID: 1404 Comm: kworker/0:2 Not tainted 4.15.0-rc1+ #203 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Workqueue: events binder_deferred_func > task: 0000000009b739b6 task.stack: 00000000c1d4442c > RIP: 0010:binder_alloc_deferred_release+0x146/0xa40 > drivers/android/binder_alloc.c:750 > RSP: 0018:ffff8801d2b16fd8 EFLAGS: 00010293 > RAX: ffff8801d2b08080 RBX: ffff8801d7829300 RCX: ffffffff8403b856 > RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8801d7829330 > RBP: ffff8801d2b17138 R08: ffffffff8403b7d9 R09: 1ffffffff0e53001 > R10: ffff8801d2b16fc8 R11: ffffffff87489d60 R12: 0000000000000000 > R13: dffffc0000000000 R14: ffff8801d2b17110 R15: ffff8801d7829310 > FS: 0000000000000000(0000) GS:ffff8801db400000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00000000006d00a8 CR3: 0000000005e25000 CR4: 00000000001406f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > binder_free_proc drivers/android/binder.c:4200 [inline] > binder_proc_dec_tmpref+0x2f3/0x420 drivers/android/binder.c:1833 > binder_deferred_release drivers/android/binder.c:4858 [inline] > binder_deferred_func+0xe22/0x12f0 drivers/android/binder.c:4893 > process_one_work+0xbfd/0x1be0 kernel/workqueue.c:2112 > worker_thread+0x223/0x1990 kernel/workqueue.c:2246 > kthread+0x37a/0x440 kernel/kthread.c:238 > ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:441 > Code: e8 00 40 6c fd 49 8d 7f 20 49 8d 5f f0 48 89 fa 48 c1 ea 03 42 80 3c > 2a 00 0f 85 84 07 00 00 49 83 7f 20 00 74 a9 e8 da 3f 6c fd <0f> 0b 48 8b 9d > e8 fe ff ff 44 89 a5 bc fe ff ff e8 c5 3f 6c fd > RIP: binder_alloc_deferred_release+0x146/0xa40 > drivers/android/binder_alloc.c:750 RSP: ffff8801d2b16fd8 > ---[ end trace 616e085d0dbf3c21 ]--- > Kernel panic - not syncing: Fatal exception > Dumping ftrace buffer: > (ftrace buffer empty) > Kernel Offset: disabled > Rebooting in 86400 seconds.. This crash stopped occurring in v4.15-rc3, and I verified that it was commit fb2c445277e which fixed it (thanks Martijn!). So, telling syzbot so that it can start reporting similar crashes again: #syz fix: ANDROID: binder: fix transaction leak. - Eric