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Sun, 10 Nov 2019 05:56:07 -0800 (PST) Date: Sun, 10 Nov 2019 05:56:07 -0800 In-Reply-To: <000000000000be219705967f9963@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000078b1710596fe60a3@google.com> Subject: Re: general protection fault in kvm_coalesced_mmio_init From: syzbot To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, pbonzini@redhat.com, rkrcmar@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org syzbot has found a reproducer for the following crash on: HEAD commit: 00aff683 Merge tag 'for-5.4-rc6-tag' of git://git.kernel.o.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1777fb52e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=896c87b73c6fcda6 dashboard link: https://syzkaller.appspot.com/bug?extid=e27e7027eb2b80e44225 compiler: clang version 9.0.0 (/home/glider/llvm/clang 80fee25776c2fb61e74c1ecb1a523375c2500b69) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17ed65aae00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+e27e7027eb2b80e44225@syzkaller.appspotmail.com kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 20263 Comm: syz-executor.2 Not tainted 5.4.0-rc6+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:kvm_coalesced_mmio_init+0x59/0xf0 arch/x86/kvm/../../../virt/kvm/coalesced_mmio.c:121 Code: 00 00 00 fc ff df e8 46 7d 6b 00 48 c1 e3 06 49 be 00 00 00 00 80 08 05 00 49 01 de 49 8d bf d8 96 00 00 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 05 e8 bb bb a4 00 4d 89 b7 d8 96 00 00 49 8d bf RSP: 0018:ffff888091647d10 EFLAGS: 00010206 RAX: 00000000000012db RBX: fffa80009cb1b000 RCX: ffff8880a42d21c0 RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 00000000000096d8 RBP: ffff888091647d30 R08: ffffffff83486eda R09: ffffed1015d46b05 R10: ffffed1015d46b05 R11: 0000000000000000 R12: dffffc0000000000 R13: 0000000000000000 R14: ffff88809cb1b000 R15: 0000000000000000 FS: 00007fb51eb61700(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa986fb7000 CR3: 000000009c69d000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kvm_dev_ioctl_create_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:3448 [inline] kvm_dev_ioctl+0x18fa/0x1fd0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3496 do_vfs_ioctl+0x744/0x1730 fs/ioctl.c:46 ksys_ioctl fs/ioctl.c:713 [inline] __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0xe3/0x120 fs/ioctl.c:718 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a219 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fb51eb60c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a219 RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000004 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb51eb616d4 R13: 00000000004c348b R14: 00000000004d7708 R15: 00000000ffffffff Modules linked in: ---[ end trace 15ab0f35a80c9e5d ]--- RIP: 0010:kvm_coalesced_mmio_init+0x59/0xf0 arch/x86/kvm/../../../virt/kvm/coalesced_mmio.c:121 Code: 00 00 00 fc ff df e8 46 7d 6b 00 48 c1 e3 06 49 be 00 00 00 00 80 08 05 00 49 01 de 49 8d bf d8 96 00 00 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 05 e8 bb bb a4 00 4d 89 b7 d8 96 00 00 49 8d bf RSP: 0018:ffff888091647d10 EFLAGS: 00010206 RAX: 00000000000012db RBX: fffa80009cb1b000 RCX: ffff8880a42d21c0 RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 00000000000096d8 RBP: ffff888091647d30 R08: ffffffff83486eda R09: ffffed1015d46b05 R10: ffffed1015d46b05 R11: 0000000000000000 R12: dffffc0000000000 R13: 0000000000000000 R14: ffff88809cb1b000 R15: 0000000000000000 FS: 00007fb51eb61700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000625208 CR3: 000000009c69d000 CR4: 00000000001426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400