From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-it1-f200.google.com (mail-it1-f200.google.com [209.85.166.200]) by kanga.kvack.org (Postfix) with ESMTP id 1022A8E0002 for ; Wed, 2 Jan 2019 04:01:07 -0500 (EST) Received: by mail-it1-f200.google.com with SMTP id m128so35562086itd.3 for ; Wed, 02 Jan 2019 01:01:07 -0800 (PST) Received: from mail-sor-f69.google.com (mail-sor-f69.google.com. [209.85.220.69]) by mx.google.com with SMTPS id v134sor31684110itb.19.2019.01.02.01.01.05 for (Google Transport Security); Wed, 02 Jan 2019 01:01:05 -0800 (PST) MIME-Version: 1.0 Date: Wed, 02 Jan 2019 01:01:05 -0800 Message-ID: <000000000000d0ce25057e75e2da@google.com> Subject: WARNING in mem_cgroup_update_lru_size From: syzbot Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: owner-linux-mm@kvack.org List-ID: To: cgroups@vger.kernel.org, hannes@cmpxchg.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, mhocko@kernel.org, syzkaller-bugs@googlegroups.com, vdavydov.dev@gmail.com Hello, syzbot found the following crash on: HEAD commit: 8e143b90e4d4 Merge tag 'iommu-updates-v4.21' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1250f377400000 kernel config: https://syzkaller.appspot.com/x/.config?x=c2ab9708c613a224 dashboard link: https://syzkaller.appspot.com/bug?extid=c950a368703778078dc8 compiler: gcc (GCC) 9.0.0 20181231 (experimental) userspace arch: i386 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14e063fd400000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+c950a368703778078dc8@syzkaller.appspotmail.com 8021q: adding VLAN 0 to HW filter on device batadv0 ------------[ cut here ]------------ kasan: CONFIG_KASAN_INLINE enabled mem_cgroup_update_lru_size(00000000e4dac0d9, 1, 1): lru_size -2032989456 kasan: GPF could be caused by NULL-ptr deref or user memory access WARNING: CPU: 0 PID: 9560 at mm/memcontrol.c:1160 mem_cgroup_update_lru_size+0xb2/0xe0 mm/memcontrol.c:1160 general protection fault: 0000 [#1] PREEMPT SMP KASAN Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 3 Comm: Not tainted 4.20.0+ #4 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__read_once_size include/linux/compiler.h:191 [inline] RIP: 0010:get_running_cputimer include/linux/sched/cputime.h:85 [inline] RIP: 0010:account_group_system_time include/linux/sched/cputime.h:149 [inline] RIP: 0010:account_system_index_time+0xe8/0x5f0 kernel/sched/cputime.c:168 Code: 04 00 00 49 8b 84 24 00 07 00 00 48 ba 00 00 00 00 00 fc ff df 48 8d b8 40 01 00 00 48 8d 88 28 01 00 00 48 89 fe 48 c1 ee 03 <0f> b6 14 16 48 89 fe 83 e6 07 40 38 f2 7f 08 84 d2 0f 85 93 03 00 RSP: 0018:ffff8880ae707a80 EFLAGS: 00010006 RAX: 0000000041b58ab3 RBX: 1ffff11015ce0f54 RCX: 0000000041b58bdb RDX: dffffc0000000000 RSI: 000000000836b17e RDI: 0000000041b58bf3 RBP: ffff8880ae707b48 R08: ffff8880ae71f5f0 R09: fffffbfff1335af5 R10: fffffbfff1301b45 R11: ffffffff899ad7a3 R12: ffff8880a94bc440 R13: 0000000000286ccf R14: 0000000000000003 R15: ffff8880ae707b20 FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000008462a98 CR3: 00000000903b3000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: irqtime_account_process_tick.isra.0+0x3a2/0x490 kernel/sched/cputime.c:380 account_process_tick+0x27f/0x350 kernel/sched/cputime.c:483 update_process_times+0x25/0x80 kernel/time/timer.c:1633 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:161 tick_sched_timer+0x47/0x130 kernel/time/tick-sched.c:1271 __run_hrtimer kernel/time/hrtimer.c:1389 [inline] __hrtimer_run_queues+0x3a7/0x1050 kernel/time/hrtimer.c:1451 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1035 [inline] smp_apic_timer_interrupt+0x18d/0x760 arch/x86/kernel/apic/apic.c:1060 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 Modules linked in: ---[ end trace 29e64cfc002b0004 ]--- RIP: 0010:__read_once_size include/linux/compiler.h:191 [inline] RIP: 0010:get_running_cputimer include/linux/sched/cputime.h:85 [inline] RIP: 0010:account_group_system_time include/linux/sched/cputime.h:149 [inline] RIP: 0010:account_system_index_time+0xe8/0x5f0 kernel/sched/cputime.c:168 Code: 04 00 00 49 8b 84 24 00 07 00 00 48 ba 00 00 00 00 00 fc ff df 48 8d b8 40 01 00 00 48 8d 88 28 01 00 00 48 89 fe 48 c1 ee 03 <0f> b6 14 16 48 89 fe 83 e6 07 40 38 f2 7f 08 84 d2 0f 85 93 03 00 RSP: 0018:ffff8880ae707a80 EFLAGS: 00010006 RAX: 0000000041b58ab3 RBX: 1ffff11015ce0f54 RCX: 0000000041b58bdb RDX: dffffc0000000000 RSI: 000000000836b17e RDI: 0000000041b58bf3 RBP: ffff8880ae707b48 R08: ffff8880ae71f5f0 R09: fffffbfff1335af5 R10: fffffbfff1301b45 R11: ffffffff899ad7a3 R12: ffff8880a94bc440 R13: 0000000000286ccf R14: 0000000000000003 R15: ffff8880ae707b20 FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000008462a98 CR3: 00000000903b3000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Shutting down cpus with NMI Kernel Offset: disabled Rebooting in 86400 seconds.. --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches 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=-5.7 required=3.0 tests=FROM_LOCAL_DIGITS, FROM_LOCAL_HEX,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_PASS autolearn=unavailable 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 DD64FC43387 for ; Wed, 2 Jan 2019 09:01:07 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 9C29A21871 for ; Wed, 2 Jan 2019 09:01:07 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9C29A21871 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 4B1B58E0014; Wed, 2 Jan 2019 04:01:07 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 461748E0002; Wed, 2 Jan 2019 04:01:07 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 3795B8E0014; Wed, 2 Jan 2019 04:01:07 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from mail-it1-f200.google.com (mail-it1-f200.google.com [209.85.166.200]) by kanga.kvack.org (Postfix) with ESMTP id 1022A8E0002 for ; Wed, 2 Jan 2019 04:01:07 -0500 (EST) Received: by mail-it1-f200.google.com with SMTP id m128so35562086itd.3 for ; Wed, 02 Jan 2019 01:01:07 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-original-authentication-results:x-gm-message-state:mime-version :date:message-id:subject:from:to; bh=+ZeU2Loj3fiRgLYzKIr7VX4i2u1TwHYv2Zointt6598=; b=D//fD2l8SYohZQ0GPjsUzug11lD8FmVOfSp8hR3pBEgJ1AIpeUfkZgE21NODK9TCGE yo4Wmj9RJ6stZlO9FKiroQVE20dzDpm+YfagRjXATe19FKBs7obyI8+vNpTZAo3AK76q 9XL5PEXxQT+7L6H/q2sLh57di+G3Ev6NFYFhAPvGgYkjVtyp0VvwCAgeffPhablPViso IIENGbQePQps9Ki0cZ7Yue8qiYJm7fanaDFOnRA6tw1tcED9a4ugF6T44htXHx+FCfKk IjPqHLx6qykELzj7YVApBOoMLkm70U31vqpbvuhcmZrxXgTrP7OoFHio+snVUYahR4t9 SZ5g== X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of 30x0sxakbagywcdoeppivettmh.ksskpiywivgsrxirx.gsq@m3kw2wvrgufz5godrsrytgd7.apphosting.bounces.google.com designates 209.85.220.69 as permitted sender) smtp.mailfrom=30X0sXAkbAGYWcdOEPPIVETTMH.KSSKPIYWIVGSRXIRX.GSQ@M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=appspotmail.com X-Gm-Message-State: AJcUukcBlGsBfKDdjrnHNMNd4uLyl8lJuyQds6E/5dbdlu81qPXaIVRA H9WWhdgQfuyq0xsARpXFSzGnsRzyEzXRuqsvLcBYoEU9TTZWFWZkk47sk95r2ziZ7IoxoCdWk05 TTBcTNEnYRo+L/cmIC6wsDiZYZhgbzaFEooNW8JUZyHtjUjrrT9wSrEEGt5Sx3aRcnx/JSTGXTB XszETEsNIDWhmqCiQFCuewJbJH3MnwL9EtwGlQspicwMz+egP8kejpjRAnoEakmuljarC+xChC1 Z0HmePsQ+5morVc/Wik84KoyBc4K9YBj3GwnIYPFHm5reZHf97KhbnEIbxccESaR3q3BROXDATA rW+GBZsuL7znW7gSUQuDuvGj1C/cG/AMWhElEa2G/QSLD1s/dDO743VpeUEv9Yl6GrjT8nRCcg= = X-Received: by 2002:a24:ac65:: with SMTP id m37mr24905233iti.49.1546419666789; Wed, 02 Jan 2019 01:01:06 -0800 (PST) X-Received: by 2002:a24:ac65:: with SMTP id m37mr24905184iti.49.1546419665824; Wed, 02 Jan 2019 01:01:05 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1546419665; cv=none; d=google.com; s=arc-20160816; b=LF7aN3y0NWgjfn4SSU0zdKTwqddrgpqhJ99oO8uMVxSZYGcyq/rQFeXQI7O21zPPb3 GdxB6VWUFYRhkJSWRfZPdwG8AIDA5CFQhM6c9BVZyoOdR2gnydswqgqBa2ZZUgBNDe+/ KTypfO9ivaD0PKkyOlTY8ObVQYbrEQChGrbFdkuu7JU1bDYiiAzoJKckldL2XBXikfiK FEOPit9fEEh9l2gXAb9mRDKBeSFG9jrg1d7boIX896LzEg6Fp1HEUcCDpg5HFzGhJaxE by3TzXhcV3YLTbt/KRliKQJZTBI2N+k3H5zB4+GzCw0u3bCjqKLWMVHxX5uIYFOiX7xm wVcA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=to:from:subject:message-id:date:mime-version; bh=+ZeU2Loj3fiRgLYzKIr7VX4i2u1TwHYv2Zointt6598=; b=fmPpDyZ4r/7W6o5N0WF2bYpbqDZcd0WQQ3gFEEA8kg4kW0rDrXDLcrVcrOGSKt/YGd rCSY1TIdiEv3Wow2ObJl5Z/8ook4E2ZewvJgQTd5hXqcaOqKsb8rpKbU+Lq/8dnzghTw D+7F52V+AGAIsRc8VbyADCxzRgeDBdFWRFjJkrXmzbEvoYMD9WoCtop+VFeJ06CwZo+j z+FJDIK3CRX1GEzryfXT59mioWReA8xm/oYyZBT9wEzz9I0ebgt8CmVrludvhsEbiJ9G /baPg+PTh15SBgMqzxkzv/4C9gRK/X0Po0cg7/Z4ffodZPfurYDuSWS5xhghrFgnYbXk MRgQ== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of 30x0sxakbagywcdoeppivettmh.ksskpiywivgsrxirx.gsq@m3kw2wvrgufz5godrsrytgd7.apphosting.bounces.google.com designates 209.85.220.69 as permitted sender) smtp.mailfrom=30X0sXAkbAGYWcdOEPPIVETTMH.KSSKPIYWIVGSRXIRX.GSQ@M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=appspotmail.com Received: from mail-sor-f69.google.com (mail-sor-f69.google.com. [209.85.220.69]) by mx.google.com with SMTPS id v134sor31684110itb.19.2019.01.02.01.01.05 for (Google Transport Security); Wed, 02 Jan 2019 01:01:05 -0800 (PST) Received-SPF: pass (google.com: domain of 30x0sxakbagywcdoeppivettmh.ksskpiywivgsrxirx.gsq@m3kw2wvrgufz5godrsrytgd7.apphosting.bounces.google.com designates 209.85.220.69 as permitted sender) client-ip=209.85.220.69; Authentication-Results: mx.google.com; spf=pass (google.com: domain of 30x0sxakbagywcdoeppivettmh.ksskpiywivgsrxirx.gsq@m3kw2wvrgufz5godrsrytgd7.apphosting.bounces.google.com designates 209.85.220.69 as permitted sender) smtp.mailfrom=30X0sXAkbAGYWcdOEPPIVETTMH.KSSKPIYWIVGSRXIRX.GSQ@M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=appspotmail.com X-Google-Smtp-Source: AFSGD/XUm43d/ocziucXig0rdvdIkCOVb+ZGzaZX/ZMOb1FUtCVLKobGHiBfCyKqPtPaFiWA9UyPMBWyMEjCwyhFaLOq3M/Kyvwk MIME-Version: 1.0 X-Received: by 2002:a24:46d5:: with SMTP id j204mr31854914itb.38.1546419665159; Wed, 02 Jan 2019 01:01:05 -0800 (PST) Date: Wed, 02 Jan 2019 01:01:05 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000d0ce25057e75e2da@google.com> Subject: WARNING in mem_cgroup_update_lru_size From: syzbot To: cgroups@vger.kernel.org, hannes@cmpxchg.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, mhocko@kernel.org, syzkaller-bugs@googlegroups.com, vdavydov.dev@gmail.com Content-Type: text/plain; charset="UTF-8"; delsp="yes"; format="flowed" X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Message-ID: <20190102090105.bh0aY9N6QPfEq9KKYNuKcuOq7Fy1-ElfoZGgFuddGeE@z> Hello, syzbot found the following crash on: HEAD commit: 8e143b90e4d4 Merge tag 'iommu-updates-v4.21' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1250f377400000 kernel config: https://syzkaller.appspot.com/x/.config?x=c2ab9708c613a224 dashboard link: https://syzkaller.appspot.com/bug?extid=c950a368703778078dc8 compiler: gcc (GCC) 9.0.0 20181231 (experimental) userspace arch: i386 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14e063fd400000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+c950a368703778078dc8@syzkaller.appspotmail.com 8021q: adding VLAN 0 to HW filter on device batadv0 ------------[ cut here ]------------ kasan: CONFIG_KASAN_INLINE enabled mem_cgroup_update_lru_size(00000000e4dac0d9, 1, 1): lru_size -2032989456 kasan: GPF could be caused by NULL-ptr deref or user memory access WARNING: CPU: 0 PID: 9560 at mm/memcontrol.c:1160 mem_cgroup_update_lru_size+0xb2/0xe0 mm/memcontrol.c:1160 general protection fault: 0000 [#1] PREEMPT SMP KASAN Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 3 Comm: Not tainted 4.20.0+ #4 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__read_once_size include/linux/compiler.h:191 [inline] RIP: 0010:get_running_cputimer include/linux/sched/cputime.h:85 [inline] RIP: 0010:account_group_system_time include/linux/sched/cputime.h:149 [inline] RIP: 0010:account_system_index_time+0xe8/0x5f0 kernel/sched/cputime.c:168 Code: 04 00 00 49 8b 84 24 00 07 00 00 48 ba 00 00 00 00 00 fc ff df 48 8d b8 40 01 00 00 48 8d 88 28 01 00 00 48 89 fe 48 c1 ee 03 <0f> b6 14 16 48 89 fe 83 e6 07 40 38 f2 7f 08 84 d2 0f 85 93 03 00 RSP: 0018:ffff8880ae707a80 EFLAGS: 00010006 RAX: 0000000041b58ab3 RBX: 1ffff11015ce0f54 RCX: 0000000041b58bdb RDX: dffffc0000000000 RSI: 000000000836b17e RDI: 0000000041b58bf3 RBP: ffff8880ae707b48 R08: ffff8880ae71f5f0 R09: fffffbfff1335af5 R10: fffffbfff1301b45 R11: ffffffff899ad7a3 R12: ffff8880a94bc440 R13: 0000000000286ccf R14: 0000000000000003 R15: ffff8880ae707b20 FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000008462a98 CR3: 00000000903b3000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: irqtime_account_process_tick.isra.0+0x3a2/0x490 kernel/sched/cputime.c:380 account_process_tick+0x27f/0x350 kernel/sched/cputime.c:483 update_process_times+0x25/0x80 kernel/time/timer.c:1633 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:161 tick_sched_timer+0x47/0x130 kernel/time/tick-sched.c:1271 __run_hrtimer kernel/time/hrtimer.c:1389 [inline] __hrtimer_run_queues+0x3a7/0x1050 kernel/time/hrtimer.c:1451 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1035 [inline] smp_apic_timer_interrupt+0x18d/0x760 arch/x86/kernel/apic/apic.c:1060 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 Modules linked in: ---[ end trace 29e64cfc002b0004 ]--- RIP: 0010:__read_once_size include/linux/compiler.h:191 [inline] RIP: 0010:get_running_cputimer include/linux/sched/cputime.h:85 [inline] RIP: 0010:account_group_system_time include/linux/sched/cputime.h:149 [inline] RIP: 0010:account_system_index_time+0xe8/0x5f0 kernel/sched/cputime.c:168 Code: 04 00 00 49 8b 84 24 00 07 00 00 48 ba 00 00 00 00 00 fc ff df 48 8d b8 40 01 00 00 48 8d 88 28 01 00 00 48 89 fe 48 c1 ee 03 <0f> b6 14 16 48 89 fe 83 e6 07 40 38 f2 7f 08 84 d2 0f 85 93 03 00 RSP: 0018:ffff8880ae707a80 EFLAGS: 00010006 RAX: 0000000041b58ab3 RBX: 1ffff11015ce0f54 RCX: 0000000041b58bdb RDX: dffffc0000000000 RSI: 000000000836b17e RDI: 0000000041b58bf3 RBP: ffff8880ae707b48 R08: ffff8880ae71f5f0 R09: fffffbfff1335af5 R10: fffffbfff1301b45 R11: ffffffff899ad7a3 R12: ffff8880a94bc440 R13: 0000000000286ccf R14: 0000000000000003 R15: ffff8880ae707b20 FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000008462a98 CR3: 00000000903b3000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Shutting down cpus with NMI Kernel Offset: disabled Rebooting in 86400 seconds.. --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches