From mboxrd@z Thu Jan 1 00:00:00 1970 From: syzbot Date: Fri, 27 Dec 2019 07:13:08 +0000 Subject: BUG: unable to handle kernel paging request in vga16fb_imageblit Message-Id: <000000000000cdb581059aaa39b2@google.com> List-Id: References: In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="windows-1252" Content-Transfer-Encoding: quoted-printable To: b.zolnierkie@samsung.com, dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Hello, syzbot found the following crash on: HEAD commit: 46cf053e Linux 5.5-rc3 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12e35351e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=ED9d672709340e35 dashboard link: https://syzkaller.appspot.com/bug?extid=83449358d6355b0b9728 compiler: gcc (GCC) 9.0.0 20181231 (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+83449358d6355b0b9728@syzkaller.appspotmail.com BUG: unable to handle page fault for address: ffff8880ffff7900 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD c201067 P4D c201067 PUD 0 Oops: 0002 [#1] PREEMPT SMP KASAN CPU: 0 PID: 31197 Comm: syz-executor.4 Not tainted 5.5.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS =20 Google 01/01/2011 RIP: 0010:writeb arch/x86/include/asm/io.h:65 [inline] RIP: 0010:vga_imageblit_expand drivers/video/fbdev/vga16fb.c:1168 [inline] RIP: 0010:vga16fb_imageblit+0xa52/0x2200 drivers/video/fbdev/vga16fb.c:1260 Code: df 48 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 = =20 7c 09 84 d2 74 05 e8 16 9f f9 fd 41 8b 45 14 48 8b 4d c8 <88> 01 0f ae e8 = 8a 01 b8 05 00 00 00 ba ce 03 00 00 ee 48 c7 c2 d8 RSP: 0018:ffffc90004e57450 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000007 RCX: ffff8880ffff7900 RDX: 0000000000000000 RSI: ffffffff83b944b6 RDI: ffffc90004e5760c RBP: ffffc90004e574e8 R08: ffff88804b708240 R09: 0000000000000000 R10: ffffed10432d371b R11: ffff88821969b8df R12: ffffc90004e575fc R13: ffffc90004e575f8 R14: ffff8880a3f140c0 R15: 0000000000000001 FS: 00007f4674e1a700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff8880ffff7900 CR3: 000000004de7b000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: bit_putcs_unaligned drivers/video/fbdev/core/bitblit.c:139 [inline] bit_putcs+0x9a3/0xf10 drivers/video/fbdev/core/bitblit.c:188 fbcon_putcs+0x33c/0x3e0 drivers/video/fbdev/core/fbcon.c:1353 fbcon_redraw_move.isra.0+0x258/0x2a0 drivers/video/fbdev/core/fbcon.c:1733 ypan_down_redraw drivers/video/fbdev/core/fbcon.c:1598 [inline] fbcon_scroll+0x2e07/0x35b0 drivers/video/fbdev/core/fbcon.c:2048 con_scroll+0x3fd/0x650 drivers/tty/vt/vt.c:631 csi_L drivers/tty/vt/vt.c:1974 [inline] do_con_trol+0x5317/0x61b0 drivers/tty/vt/vt.c:2373 do_con_write.part.0+0xfd9/0x1ef0 drivers/tty/vt/vt.c:2797 do_con_write drivers/tty/vt/vt.c:2565 [inline] con_write+0x46/0xd0 drivers/tty/vt/vt.c:3135 process_output_block drivers/tty/n_tty.c:595 [inline] n_tty_write+0x40e/0x1080 drivers/tty/n_tty.c:2333 do_tty_write drivers/tty/tty_io.c:962 [inline] tty_write+0x496/0x7f0 drivers/tty/tty_io.c:1046 __vfs_write+0x8a/0x110 fs/read_write.c:494 vfs_write+0x268/0x5d0 fs/read_write.c:558 ksys_write+0x14f/0x290 fs/read_write.c:611 __do_sys_write fs/read_write.c:623 [inline] __se_sys_write fs/read_write.c:620 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:620 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a919 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 = =20 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:00007f4674e19c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a919 RDX: 00000000000002c1 RSI: 0000000020000880 RDI: 0000000000000009 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4674e1a6d4 R13: 00000000004cbd7a R14: 00000000004e5b48 R15: 00000000ffffffff Modules linked in: CR2: ffff8880ffff7900 ---[ end trace 80930dfe0366796b ]--- RIP: 0010:writeb arch/x86/include/asm/io.h:65 [inline] RIP: 0010:vga_imageblit_expand drivers/video/fbdev/vga16fb.c:1168 [inline] RIP: 0010:vga16fb_imageblit+0xa52/0x2200 drivers/video/fbdev/vga16fb.c:1260 Code: df 48 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 = =20 7c 09 84 d2 74 05 e8 16 9f f9 fd 41 8b 45 14 48 8b 4d c8 <88> 01 0f ae e8 = 8a 01 b8 05 00 00 00 ba ce 03 00 00 ee 48 c7 c2 d8 RSP: 0018:ffffc90004e57450 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000007 RCX: ffff8880ffff7900 RDX: 0000000000000000 RSI: ffffffff83b944b6 RDI: ffffc90004e5760c RBP: ffffc90004e574e8 R08: ffff88804b708240 R09: 0000000000000000 R10: ffffed10432d371b R11: ffff88821969b8df R12: ffffc90004e575fc R13: ffffc90004e575f8 R14: ffff8880a3f140c0 R15: 0000000000000001 FS: 00007f4674e1a700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff8880ffff7900 CR3: 000000004de7b000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- This bug is generated by a bot. 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