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Mon, 06 Apr 2020 11:16:14 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=qNP9UDy4Ly1/fSgo8ZGDVd9zXzm3XrXZBZreph/oOFo=; b=Uai+FJIeTMy0l4CgIbX9YWRTm6d+6FhOT0bflUgczfvw9H5XoA4kKnELQgN0zOkAYk w53O8+NdcqcEI7cWwoE3+LFZqX6VzbtGrKIjxIqe5HJo/TlmzR56O4gU336CeDAo3mPR mkioOYU+tPsu5JakYRAKbQhZTV7E5ofebRFrpnW9wIsw+P22mXglYaBMX7pin8ATwMy/ nmZviXmkHM/FD5KnE08e8NGX6A1TuIFwqn51A4FKrGRJWhh1OllqhWGGR/CXwZ4nTfkJ 0ZyLUBF+wsCz4JJvkr2fLNUT69/mWCCdeqqAllrngYQvrP22wDH/AOFrQpXsacBDTO1t 9qXQ== X-Gm-Message-State: AGi0PuZ2/NN0CoraIaz2AXg8iO063PmSDfZhbTBQlARvY+IJUp7bNWoy CS4IY3KbI0UbiOoBoaYiYMeb04eZFbfKn5J0rWHTSMCIXruE X-Google-Smtp-Source: APiQypIHw/QFNnMEPb7wn/+NCy7yUgDe/gv7pno2an9Nkl/JIv8/B9KBw/oYfu05eW7vIon8xsuEO++3IcX7rqQSRsL8X2sqenT3 MIME-Version: 1.0 X-Received: by 2002:a92:8510:: with SMTP id f16mr651423ilh.208.1586196973821; Mon, 06 Apr 2020 11:16:13 -0700 (PDT) Date: Mon, 06 Apr 2020 11:16:13 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000002b25f105a2a3434d@google.com> Subject: BUG: unable to handle kernel paging request in kernel_get_mempolicy From: syzbot To: akpm@linux-foundation.org, bgeffon@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, peterx@redhat.com, syzkaller-bugs@googlegroups.com, torvalds@linux-foundation.org Content-Type: text/plain; charset="UTF-8" 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: Hello, syzbot found the following crash on: HEAD commit: bef7b2a7 Merge tag 'devicetree-for-5.7' of git://git.kerne.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13966e8fe00000 kernel config: https://syzkaller.appspot.com/x/.config?x=91b674b8f0368e69 dashboard link: https://syzkaller.appspot.com/bug?extid=693dc11fcb53120b5559 compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1738b02be00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17d2c76de00000 The bug was bisected to: commit 4426e945df588f2878affddf88a51259200f7e29 Author: Peter Xu Date: Thu Apr 2 04:08:49 2020 +0000 mm/gup: allow VM_FAULT_RETRY for multiple times bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=14ac4a5de00000 final crash: https://syzkaller.appspot.com/x/report.txt?x=16ac4a5de00000 console output: https://syzkaller.appspot.com/x/log.txt?x=12ac4a5de00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+693dc11fcb53120b5559@syzkaller.appspotmail.com Fixes: 4426e945df58 ("mm/gup: allow VM_FAULT_RETRY for multiple times") BUG: unable to handle page fault for address: ffffffff00000000 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 987c067 P4D 987c067 PUD 0 Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 7181 Comm: syz-executor616 Not tainted 5.6.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:page_to_nid include/linux/mm.h:1245 [inline] RIP: 0010:lookup_node mm/mempolicy.c:906 [inline] RIP: 0010:do_get_mempolicy mm/mempolicy.c:970 [inline] RIP: 0010:kernel_get_mempolicy+0x60e/0xfb0 mm/mempolicy.c:1615 Code: 88 00 07 00 00 e8 b2 35 c5 ff 4c 8b 7c 24 78 48 b8 00 00 00 00 00 fc ff df 4c 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 fb 08 00 00 <49> 8b 1f 48 c7 c7 ff ff ff ff 48 89 de e8 10 37 c5 ff 48 83 fb ff RSP: 0018:ffffc900018d7de8 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff81adaaf1 RDX: 1fffffffe0000000 RSI: ffffffff81adaafe RDI: 0000000000000005 RBP: 0000000000000000 R08: ffff88808de924c0 R09: ffffed1011bd2499 R10: ffff88808de924c7 R11: ffffed1011bd2498 R12: 0000000000000000 R13: 1ffff9200031afc4 R14: ffffffff89a6df60 R15: ffffffff00000000 FS: 00007f848cd4a700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffff00000000 CR3: 00000000a7a8d000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __do_sys_get_mempolicy mm/mempolicy.c:1633 [inline] __se_sys_get_mempolicy mm/mempolicy.c:1629 [inline] __x64_sys_get_mempolicy+0xba/0x150 mm/mempolicy.c:1629 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x446719 Code: e8 5c b3 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 0b 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f848cd49db8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ef RAX: ffffffffffffffda RBX: 00000000006dbc28 RCX: 0000000000446719 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00000000006dbc20 R08: 0000000000000003 R09: 0000000000000000 R10: 000000002073b000 R11: 0000000000000246 R12: 00000000006dbc2c R13: 00007ffcfe6ba66f R14: 00007f848cd4a9c0 R15: 20c49ba5e353f7cf Modules linked in: CR2: ffffffff00000000 ---[ end trace 0becf554e06291c3 ]--- RIP: 0010:page_to_nid include/linux/mm.h:1245 [inline] RIP: 0010:lookup_node mm/mempolicy.c:906 [inline] RIP: 0010:do_get_mempolicy mm/mempolicy.c:970 [inline] RIP: 0010:kernel_get_mempolicy+0x60e/0xfb0 mm/mempolicy.c:1615 Code: 88 00 07 00 00 e8 b2 35 c5 ff 4c 8b 7c 24 78 48 b8 00 00 00 00 00 fc ff df 4c 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 fb 08 00 00 <49> 8b 1f 48 c7 c7 ff ff ff ff 48 89 de e8 10 37 c5 ff 48 83 fb ff RSP: 0018:ffffc900018d7de8 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff81adaaf1 RDX: 1fffffffe0000000 RSI: ffffffff81adaafe RDI: 0000000000000005 RBP: 0000000000000000 R08: ffff88808de924c0 R09: ffffed1011bd2499 R10: ffff88808de924c7 R11: ffffed1011bd2498 R12: 0000000000000000 R13: 1ffff9200031afc4 R14: ffffffff89a6df60 R15: ffffffff00000000 FS: 00007f848cd4a700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffff00000000 CR3: 00000000a7a8d000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- 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#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches