BUG: unable to handle kernel paging request in do_con_write

From: syzbot
Date: Thu Jan 16 2020 - 00:59:11 EST

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Hello,

syzbot found the following crash on:

HEAD commit: 51d69817 Merge tag 'platform-drivers-x86-v5.5-3' of git://..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15a41c76e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=cfbb8fa33f49f9f3
dashboard link: https://syzkaller.appspot.com/bug?extid=d8cbeb7028cd2950172e
compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81)

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+d8cbeb7028cd2950172e@xxxxxxxxxxxxxxxxxxxxxxxxx

BUG: unable to handle page fault for address: ffffffff0000000e
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 9070067 P4D 9070067 PUD 0
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 25087 Comm: syz-executor.4 Not tainted 5.5.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:memset16 arch/x86/include/asm/string_64.h:25 [inline]
RIP: 0010:scr_memsetw include/linux/vt_buffer.h:36 [inline]
RIP: 0010:delete_char drivers/tty/vt/vt.c:853 [inline]
RIP: 0010:csi_P drivers/tty/vt/vt.c:1985 [inline]
RIP: 0010:do_con_trol drivers/tty/vt/vt.c:2379 [inline]
RIP: 0010:do_con_write+0x9565/0xf360 drivers/tty/vt/vt.c:2797
Code: 00 00 00 00 fc ff df 8a 04 08 84 c0 0f 85 60 4b 00 00 48 8b 84 24 a0 00 00 00 0f b7 00 41 81 e4 ff ff ff 7f 4c 89 e1 48 89 df <f3> 66 ab 48 b8 00 00 00 00 00 fc ff df 48 8b 4c 24 50 8a 04 01 84
RSP: 0018:ffffc900019e7880 EFLAGS: 00010202
RAX: 0000000000000720 RBX: ffffffff0000000e RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000100000010 RDI: ffffffff0000000e
RBP: ffffc900019e7b68 R08: ffffffff83fa0511 R09: ffffffff83f9de70
R10: ffff8880a14b0180 R11: 000000000000001c R12: 0000000000000001
R13: 0000000000000000 R14: 0000000100000010 R15: 0000000000000002
FS: 00007f9510ce8700(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff0000000e CR3: 000000009570c000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
con_write+0x25/0x40 drivers/tty/vt/vt.c:3135
process_output_block drivers/tty/n_tty.c:595 [inline]
n_tty_write+0xd0c/0x1200 drivers/tty/n_tty.c:2333
do_tty_write drivers/tty/tty_io.c:962 [inline]
tty_write+0x5a1/0x950 drivers/tty/tty_io.c:1046
__vfs_write+0xb8/0x740 fs/read_write.c:494
vfs_write+0x270/0x580 fs/read_write.c:558
ksys_write+0x117/0x220 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+0x7b/0x90 fs/read_write.c:620
do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45aff9
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:00007f9510ce7c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f9510ce86d4 RCX: 000000000045aff9
RDX: 0000000000000320 RSI: 00000000200001c0 RDI: 0000000000000003
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000c60 R14: 00000000004cd0b9 R15: 000000000075bf2c
Modules linked in:
CR2: ffffffff0000000e
---[ end trace 0cf51c4bf0974ba5 ]---
RIP: 0010:memset16 arch/x86/include/asm/string_64.h:25 [inline]
RIP: 0010:scr_memsetw include/linux/vt_buffer.h:36 [inline]
RIP: 0010:delete_char drivers/tty/vt/vt.c:853 [inline]
RIP: 0010:csi_P drivers/tty/vt/vt.c:1985 [inline]
RIP: 0010:do_con_trol drivers/tty/vt/vt.c:2379 [inline]
RIP: 0010:do_con_write+0x9565/0xf360 drivers/tty/vt/vt.c:2797
Code: 00 00 00 00 fc ff df 8a 04 08 84 c0 0f 85 60 4b 00 00 48 8b 84 24 a0 00 00 00 0f b7 00 41 81 e4 ff ff ff 7f 4c 89 e1 48 89 df <f3> 66 ab 48 b8 00 00 00 00 00 fc ff df 48 8b 4c 24 50 8a 04 01 84
RSP: 0018:ffffc900019e7880 EFLAGS: 00010202
RAX: 0000000000000720 RBX: ffffffff0000000e RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000100000010 RDI: ffffffff0000000e
RBP: ffffc900019e7b68 R08: ffffffff83fa0511 R09: ffffffff83f9de70
R10: ffff8880a14b0180 R11: 000000000000001c R12: 0000000000000001
R13: 0000000000000000 R14: 0000000100000010 R15: 0000000000000002
FS: 00007f9510ce8700(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff0000000e CR3: 000000009570c000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

---
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Next message: syzbot: "Re: BUG: corrupted list in nft_obj_del"
Previous message: Yan Zhao: "Re: [PATCH v2 2/2] drm/i915/gvt: subsitute kvm_read/write_guest with vfio_dma_rw"
Next in thread: syzbot: "Re: BUG: unable to handle kernel paging request in do_con_write"
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