From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752827AbeCaUrK (ORCPT ); Sat, 31 Mar 2018 16:47:10 -0400 Received: from mail-io0-f198.google.com ([209.85.223.198]:55175 "EHLO mail-io0-f198.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751207AbeCaUrG (ORCPT ); Sat, 31 Mar 2018 16:47:06 -0400 X-Google-Smtp-Source: AIpwx4+vA7frAdr3Mh1GomL19xIjnKIrPkHufQTTELHCRorDfw9VJLtPxQS4Zqg79irNAbx9kg/F1l1O9Yzjldm8ua0ja+jXJN7e MIME-Version: 1.0 Date: Sat, 31 Mar 2018 13:47:05 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <001a113fe4c0a623b10568bb75ea@google.com> Subject: general protection fault in __mem_cgroup_free 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"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot hit the following crash on upstream commit 9dd2326890d89a5179967c947dab2bab34d7ddee (Fri Mar 30 17:29:47 2018 +0000) Merge tag 'ceph-for-4.16-rc8' of git://github.com/ceph/ceph-client syzbot dashboard link: https://syzkaller.appspot.com/bug?extid=8a5de3cce7cdc70e9ebe So far this crash happened 14 times on upstream. C reproducer: https://syzkaller.appspot.com/x/repro.c?id=5578311367393280 syzkaller reproducer: https://syzkaller.appspot.com/x/repro.syz?id=5708657048158208 Raw console output: https://syzkaller.appspot.com/x/log.txt?id=6693821748346880 Kernel config: https://syzkaller.appspot.com/x/.config?id=-2760467897697295172 compiler: gcc (GCC) 7.1.1 20170620 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+8a5de3cce7cdc70e9ebe@syzkaller.appspotmail.com It will help syzbot understand when the bug is fixed. See footer for details. If you forward the report, please keep this part and the footer. RBP: 00000000006dcc20 R08: 0000000000000002 R09: 0000000000003335 R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e R13: 00007f1747954d80 R14: ffffffffffffffff R15: 0000000000000006 kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 0 PID: 4422 Comm: syzkaller101598 Not tainted 4.16.0-rc7+ #372 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:free_mem_cgroup_per_node_info mm/memcontrol.c:4111 [inline] RIP: 0010:__mem_cgroup_free+0x71/0x110 mm/memcontrol.c:4120 RSP: 0018:ffff8801accf75a8 EFLAGS: 00010206 RAX: 0000000000000011 RBX: 0000000000000000 RCX: ffffffff8310cdfd RDX: 0000000000000000 RSI: 0000000000000040 RDI: 0000000000000088 RBP: ffff8801accf75c8 R08: 0000000000000000 R09: ffff8801accf73a0 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff8801ad210d40 R14: dffffc0000000000 R15: ffff8801ad210d40 FS: 00007f1747955700(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000460000 CR3: 00000001cb367004 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: mem_cgroup_free mm/memcontrol.c:4128 [inline] mem_cgroup_css_alloc+0x403/0x19c0 mm/memcontrol.c:4239 css_create kernel/cgroup/cgroup.c:4729 [inline] cgroup_apply_control_enable+0x44d/0xbc0 kernel/cgroup/cgroup.c:2916 cgroup_mkdir+0x56f/0xfc0 kernel/cgroup/cgroup.c:4938 kernfs_iop_mkdir+0x153/0x1e0 fs/kernfs/dir.c:1099 vfs_mkdir+0x390/0x600 fs/namei.c:3800 SYSC_mkdirat fs/namei.c:3823 [inline] SyS_mkdirat+0x22b/0x2b0 fs/namei.c:3807 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x44a0c9 RSP: 002b:00007f1747954d78 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00000000006dcc24 RCX: 000000000044a0c9 RDX: 0000000000000020 RSI: 0000000020000280 RDI: 0000000000000005 RBP: 00000000006dcc20 R08: 0000000000000002 R09: 0000000000003335 R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e R13: 00007f1747954d80 R14: ffffffffffffffff R15: 0000000000000006 Code: 00 00 48 89 f8 48 c1 e8 03 42 80 3c 30 00 0f 85 99 00 00 00 4f 8b a4 e5 f0 09 00 00 49 8d bc 24 88 00 00 00 48 89 f8 48 c1 e8 03 <42> 80 3c 30 00 0f 85 88 00 00 00 49 8b bc 24 88 00 00 00 e8 77 RIP: free_mem_cgroup_per_node_info mm/memcontrol.c:4111 [inline] RSP: ffff8801accf75a8 RIP: __mem_cgroup_free+0x71/0x110 mm/memcontrol.c:4120 RSP: ffff8801accf75a8 ---[ end trace 57ac07c30502ef78 ]--- Kernel panic - not syncing: Fatal exception Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds.. --- This bug is generated by a dumb bot. It may contain errors. See https://goo.gl/tpsmEJ for details. Direct all questions to syzkaller@googlegroups.com. syzbot will keep track of this bug report. If you forgot to add the Reported-by tag, once the fix for this bug is merged into any tree, please reply to this email with: #syz fix: exact-commit-title If you want to test a patch for this bug, please reply with: #syz test: git://repo/address.git branch and provide the patch inline or as an attachment. To mark this as a duplicate of another syzbot report, please reply with: #syz dup: exact-subject-of-another-report If it's a one-off invalid bug report, please reply with: #syz invalid Note: if the crash happens again, it will cause creation of a new bug report. Note: all commands must start from beginning of the line in the email body.