From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754031AbeEAIbG (ORCPT ); Tue, 1 May 2018 04:31:06 -0400 Received: from mail-io0-f199.google.com ([209.85.223.199]:46975 "EHLO mail-io0-f199.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752090AbeEAIbC (ORCPT ); Tue, 1 May 2018 04:31:02 -0400 X-Google-Smtp-Source: AB8JxZqR5e/U2kwwaC3pdJNNeuuWwYRYC9gpiwwxWSIL76aI9sMyVwlVGXH4gqZ0ukH3Gb41aaxEXI8aDwjCSBNkirmmVbOCKJmC MIME-Version: 1.0 Date: Tue, 01 May 2018 01:31:01 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000005dbad8056b20cabc@google.com> Subject: kernel BUG at include/linux/mm.h:LINE! From: syzbot To: akpm@linux-foundation.org, bhe@redhat.com, dyoung@redhat.com, hpa@zytor.com, kirill.shutemov@linux.intel.com, linux-kernel@vger.kernel.org, mingo@redhat.com, prudo@linux.vnet.ibm.com, syzkaller-bugs@googlegroups.com, takahiro.akashi@linaro.org, tglx@linutronix.de, thomas.lendacky@amd.com, x86@kernel.org, xlpang@redhat.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 found the following crash on: HEAD commit: 6da6c0db5316 Linux v4.17-rc3 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?id=5229040734568448 kernel config: https://syzkaller.appspot.com/x/.config?id=6493557782959164711 dashboard link: https://syzkaller.appspot.com/bug?extid=d96f60296ef613fe1d69 compiler: gcc (GCC) 8.0.1 20180413 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+d96f60296ef613fe1d69@syzkaller.appspotmail.com flags: 0x2fffc0000000000() raw: 02fffc0000000000 0000000000000000 0000000000000000 00000000ffffffff raw: ffffea00071786e0 ffff8801daf2fdd8 0000000000000000 0000000000000000 page dumped because: VM_BUG_ON_PAGE(page_ref_count(page) == 0) ------------[ cut here ]------------ kernel BUG at include/linux/mm.h:492! invalid opcode: 0000 [#1] SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 1 PID: 10012 Comm: syz-executor1 Not tainted 4.17.0-rc3+ #25 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:put_page_testzero include/linux/mm.h:492 [inline] RIP: 0010:__free_pages+0x14f/0x180 mm/page_alloc.c:4427 RSP: 0018:ffff8801b881fc08 EFLAGS: 00010203 RAX: 0000000000000000 RBX: 1ffff10037103f82 RCX: 0000000000000000 RDX: 0000000000040000 RSI: ffffffff81a5b455 RDI: ffffed0037103f70 RBP: ffff8801b881fc98 R08: ffff8801b0c9a080 R09: 0000000000000006 R10: ffff8801b0c9a080 R11: 0000000000000000 R12: ffffea00072e24c0 R13: 1ffff10037103f86 R14: ffff8801b881fc70 R15: ffffea00072e24dc FS: 00007f2e2794c700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000000 CR3: 00000001ae61b000 CR4: 00000000001406e0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: free_pages+0x50/0x90 mm/page_alloc.c:4441 free_transition_pgtable+0x68/0xf0 arch/x86/kernel/machine_kexec_64.c:42 machine_kexec_cleanup+0x9/0x10 arch/x86/kernel/machine_kexec_64.c:268 kimage_free+0x1f2/0x270 kernel/kexec_core.c:639 do_kexec_load+0x53a/0x790 kernel/kexec.c:170 __do_sys_kexec_load kernel/kexec.c:243 [inline] __se_sys_kexec_load kernel/kexec.c:218 [inline] __x64_sys_kexec_load+0x1bf/0x230 kernel/kexec.c:218 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455979 RSP: 002b:00007f2e2794bc68 EFLAGS: 00000246 ORIG_RAX: 00000000000000f6 RAX: ffffffffffffffda RBX: 00007f2e2794c6d4 RCX: 0000000000455979 RDX: 0000000020000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000013 R13: 0000000000000403 R14: 00000000006fa0e8 R15: 000000000000000a Code: 68 5b 41 5c 41 5d 41 5e 41 5f 5d c3 8b b5 74 ff ff ff 4c 89 e7 e8 02 87 ff ff eb c6 48 c7 c6 00 66 d0 87 4c 89 e7 e8 81 7a 0d 00 <0f> 0b 4c 89 ef 89 85 70 ff ff ff e8 51 7b 1d 00 8b 85 70 ff ff RIP: put_page_testzero include/linux/mm.h:492 [inline] RSP: ffff8801b881fc08 RIP: __free_pages+0x14f/0x180 mm/page_alloc.c:4427 RSP: ffff8801b881fc08 ---[ end trace f3320966708ec92c ]--- --- This bug is generated by a bot. 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