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Wed, 30 Jan 2019 03:32:03 -0800 (PST) Date: Wed, 30 Jan 2019 03:32:03 -0800 In-Reply-To: <0000000000007e10c50580aa7684@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000004a10840580ab4277@google.com> Subject: Re: general protection fault in __dentry_path From: syzbot To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org syzbot has found a reproducer for the following crash on: HEAD commit: 02495e76ded5 Add linux-next specific files for 20190130 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=106161ef400000 kernel config: https://syzkaller.appspot.com/x/.config?x=a2b2e9c0bc43c14d dashboard link: https://syzkaller.appspot.com/bug?extid=7857962b4d45e602b8ad compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1182e5b8c00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+7857962b4d45e602b8ad@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: 8239 Comm: syz-executor4 Not tainted 5.0.0-rc4-next-20190130 #22 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__dentry_path+0x2a5/0xaa0 fs/d_path.c:344 Code: 00 00 e8 1e 9d 9f ff 48 c7 c7 68 26 81 89 e8 72 c4 14 06 e8 0d 9d 9f ff 48 8b 85 00 ff ff ff 48 8d 78 40 48 89 f8 48 c1 e8 03 <42> 80 3c 38 00 0f 85 b0 07 00 00 48 8b 85 00 ff ff ff 4c 8b 68 40 RSP: 0018:ffff88808ab5f8a8 EFLAGS: 00010207 RAX: 0000000000000005 RBX: 0000000000000000 RCX: ffffffff81e27f21 RDX: 0000000000000000 RSI: ffffffff81e27c43 RDI: 000000000000002f RBP: ffff88808ab5f9d0 R08: ffff88809edd4280 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88808ab5f9a8 R13: 0000000000000000 R14: 0000000000000c78 R15: dffffc0000000000 FS: 00007f69a6d18700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000144a008 CR3: 00000000a1190000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: dentry_path_raw+0x26/0x30 fs/d_path.c:371 kvm_uevent_notify_change.part.0+0x213/0x440 arch/x86/kvm/../../../virt/kvm/kvm_main.c:4050 kvm_uevent_notify_change arch/x86/kvm/../../../virt/kvm/kvm_main.c:4017 [inline] kvm_dev_ioctl_create_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:3355 [inline] kvm_dev_ioctl+0x137a/0x1a60 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3377 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0x107b/0x17d0 fs/ioctl.c:696 ksys_ioctl+0xab/0xd0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458089 Code: 6d b7 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 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f69a6d17c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458089 RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000006 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f69a6d186d4 R13: 00000000004c0bcf R14: 00000000004d2890 R15: 00000000ffffffff Modules linked in: ---[ end trace c2b508264c762aae ]--- RIP: 0010:__dentry_path+0x2a5/0xaa0 fs/d_path.c:344 Code: 00 00 e8 1e 9d 9f ff 48 c7 c7 68 26 81 89 e8 72 c4 14 06 e8 0d 9d 9f ff 48 8b 85 00 ff ff ff 48 8d 78 40 48 89 f8 48 c1 e8 03 <42> 80 3c 38 00 0f 85 b0 07 00 00 48 8b 85 00 ff ff ff 4c 8b 68 40 RSP: 0018:ffff88808ab5f8a8 EFLAGS: 00010207 RAX: 0000000000000005 RBX: 0000000000000000 RCX: ffffffff81e27f21 RDX: 0000000000000000 RSI: ffffffff81e27c43 RDI: 000000000000002f RBP: ffff88808ab5f9d0 R08: ffff88809edd4280 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88808ab5f9a8 R13: 0000000000000000 R14: 0000000000000c78 R15: dffffc0000000000 FS: 00007f69a6d18700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fec12a1fdb8 CR3: 00000000a1190000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400