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Wed, 12 Feb 2020 12:07:09 -0800 (PST) Date: Wed, 12 Feb 2020 12:07:09 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000791270059e668493@google.com> Subject: general protection fault in redraw_screen From: syzbot To: daniel.vetter@ffwll.ch, ghalat@redhat.com, gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org, lukas@wunner.de, maarten.lankhorst@linux.intel.com, nico@fluxnic.net, sam@ravnborg.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 359c92c0 Merge tag 'dax-fixes-5.6-rc1' of git://git.kernel.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15a432a1e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=6780df5a5f208964 dashboard link: https://syzkaller.appspot.com/bug?extid=4a5a3604a566ede699b9 compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16d2e2a1e00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11ff82e6e00000 Bisection is inconclusive: the bug happens on the oldest tested release. bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1701cfa5e00000 final crash: https://syzkaller.appspot.com/x/report.txt?x=1481cfa5e00000 console output: https://syzkaller.appspot.com/x/log.txt?x=1081cfa5e00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+4a5a3604a566ede699b9@syzkaller.appspotmail.com general protection fault, probably for non-canonical address 0xdffffc0020000001: 0000 [#1] PREEMPT SMP KASAN KASAN: probably user-memory-access in range [0x0000000100000008-0x000000010000000f] CPU: 1 PID: 2936 Comm: kworker/1:49 Not tainted 5.6.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events console_callback RIP: 0010:add_softcursor drivers/tty/vt/vt.c:865 [inline] RIP: 0010:set_cursor drivers/tty/vt/vt.c:906 [inline] RIP: 0010:redraw_screen+0xf1c/0x1830 drivers/tty/vt/vt.c:1013 Code: 00 00 00 00 00 fc ff df 80 3c 10 00 74 12 48 89 df e8 68 2f b5 fd 48 ba 00 00 00 00 00 fc ff df 4c 8b 2b 4d 89 ec 49 c1 ec 03 <41> 8a 04 14 84 c0 0f 85 ef 07 00 00 45 0f b7 75 00 48 8b 45 a0 48 RSP: 0018:ffffc900085b7b38 EFLAGS: 00010203 RAX: 1ffff110127e0c74 RBX: ffff888093f063a0 RCX: ffff88809e516640 RDX: dffffc0000000000 RSI: 00000000000000c0 RDI: 0000000000000000 RBP: ffffc900085b7bc0 R08: ffffffff83fef5be R09: ffffed10431c9484 R10: ffffed10431c9484 R11: 0000000000000000 R12: 0000000020000001 R13: 000000010000000c R14: 000000000000001f R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000455300 CR3: 000000008c51f000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: complete_change_console+0xb9/0x750 drivers/tty/vt/vt_ioctl.c:1264 change_console+0x2d8/0x450 drivers/tty/vt/vt_ioctl.c:1389 console_callback+0x104/0x330 drivers/tty/vt/vt.c:2824 process_one_work+0x7f5/0x10f0 kernel/workqueue.c:2264 worker_thread+0xbbc/0x1630 kernel/workqueue.c:2410 kthread+0x332/0x350 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Modules linked in: ---[ end trace f61ede7c24462fc9 ]--- RIP: 0010:add_softcursor drivers/tty/vt/vt.c:865 [inline] RIP: 0010:set_cursor drivers/tty/vt/vt.c:906 [inline] RIP: 0010:redraw_screen+0xf1c/0x1830 drivers/tty/vt/vt.c:1013 Code: 00 00 00 00 00 fc ff df 80 3c 10 00 74 12 48 89 df e8 68 2f b5 fd 48 ba 00 00 00 00 00 fc ff df 4c 8b 2b 4d 89 ec 49 c1 ec 03 <41> 8a 04 14 84 c0 0f 85 ef 07 00 00 45 0f b7 75 00 48 8b 45 a0 48 RSP: 0018:ffffc900085b7b38 EFLAGS: 00010203 RAX: 1ffff110127e0c74 RBX: ffff888093f063a0 RCX: ffff88809e516640 RDX: dffffc0000000000 RSI: 00000000000000c0 RDI: 0000000000000000 RBP: ffffc900085b7bc0 R08: ffffffff83fef5be R09: ffffed10431c9484 R10: ffffed10431c9484 R11: 0000000000000000 R12: 0000000020000001 R13: 000000010000000c R14: 000000000000001f R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000455300 CR3: 000000008c51f000 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