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BUG: unable to handle kernel paging request in do_con_trol

Status: upstream: reported C repro on 2019/12/09 17:13
Reported-by: syzbot+b278b6a526f6a5af5fc6@syzkaller.appspotmail.com
First crash: 1809d, last: 1638d
Fix bisection the fix commit could be any of (bisect log):
  a844dc4c5442 Linux 4.14.158
  4139fb08c05f Linux 4.14.187
   
▶ ▼ Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 BUG: unable to handle kernel paging request in do_con_trol C done 36 1577d 1809d 1/1 fixed on 2020/08/28 16:06
upstream BUG: unable to handle kernel paging request in do_con_trol serial C done 98 1611d 1809d 0/28 closed as dup on 2020/07/20 22:52
▶ ▼ Last patch testing requests (2)
Created Duration User Patch Repo Result
2022/12/27 15:31 9m retest repro linux-4.14.y report log
2022/08/31 14:27 11m retest repro linux-4.14.y report log
▶ ▼ Fix bisection attempts (3)
Created Duration User Patch Repo Result
2020/06/27 03:30 29m (3) bisect fix linux-4.14.y OK (2) job log
2020/04/23 22:55 24m bisect fix linux-4.14.y OK (0) job log log
2020/03/24 22:22 27m bisect fix linux-4.14.y OK (0) job log log

Sample crash report:
audit: type=1400 audit(1575911417.577:36): avc:  denied  { map } for  pid=6980 comm="syz-executor237" path="/root/syz-executor237277072" dev="sda1" ino=16484 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
BUG: unable to handle kernel paging request at 000000010000000e
IP: memset16 arch/x86/include/asm/string_64.h:58 [inline]
IP: scr_memsetw include/linux/vt_buffer.h:36 [inline]
IP: csi_K drivers/tty/vt/vt.c:1222 [inline]
IP: do_con_trol+0x2fac/0x5b40 drivers/tty/vt/vt.c:2013
PGD 8ea9a067 P4D 8ea9a067 PUD 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 6980 Comm: syz-executor237 Not tainted 4.14.158-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8880a950c300 task.stack: ffff888098ec0000
RIP: 0010:memset16 arch/x86/include/asm/string_64.h:58 [inline]
RIP: 0010:scr_memsetw include/linux/vt_buffer.h:36 [inline]
RIP: 0010:csi_K drivers/tty/vt/vt.c:1222 [inline]
RIP: 0010:do_con_trol+0x2fac/0x5b40 drivers/tty/vt/vt.c:2013
RSP: 0018:ffff888098ec7878 EFLAGS: 00010202
RAX: 0000000000000720 RBX: 1ffff110131d8f13 RCX: 0000000000000001
RDX: 1ffff110100fbe51 RSI: 1ffff110100fbe67 RDI: 000000010000000e
RBP: ffff888098ec7960 R08: ffff8880807df28c R09: 0000000000000002
R10: 0000000000000000 R11: ffff8880a950c300 R12: ffff8880807deec0
R13: 0000000000000001 R14: 000000010000000e R15: 0000000000000002
FS:  0000000000e53880(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000010000000e CR3: 00000000a4870000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 do_con_write.part.0+0xcc7/0x1b50 drivers/tty/vt/vt.c:2434
 do_con_write drivers/tty/vt/vt.c:2205 [inline]
 con_write+0x38/0xc0 drivers/tty/vt/vt.c:2787
 process_output_block drivers/tty/n_tty.c:595 [inline]
 n_tty_write+0x38b/0xee0 drivers/tty/n_tty.c:2333
 do_tty_write drivers/tty/tty_io.c:959 [inline]
 tty_write+0x3f6/0x700 drivers/tty/tty_io.c:1043
 __vfs_write+0x105/0x6b0 fs/read_write.c:480
 vfs_write+0x198/0x500 fs/read_write.c:544
 SYSC_write fs/read_write.c:590 [inline]
 SyS_write+0xfd/0x230 fs/read_write.c:582
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4404f9
RSP: 002b:00007ffed2974698 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004404f9
RDX: 0000000000000078 RSI: 0000000020000200 RDI: 0000000000000004
RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401de0
R13: 0000000000401e70 R14: 0000000000000000 R15: 0000000000000000
Code: c1 e0 2a 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74 08 2c 01 0f 8e e4 29 00 00 41 0f b7 84 24 c8 03 00 00 44 89 f9 4c 89 f7 d1 e9 <f3> 66 ab 49 8d bc 24 78 04 00 00 b8 ff ff 37 00 48 89 fa 48 c1 
RIP: memset16 arch/x86/include/asm/string_64.h:58 [inline] RSP: ffff888098ec7878
RIP: scr_memsetw include/linux/vt_buffer.h:36 [inline] RSP: ffff888098ec7878
RIP: csi_K drivers/tty/vt/vt.c:1222 [inline] RSP: ffff888098ec7878
RIP: do_con_trol+0x2fac/0x5b40 drivers/tty/vt/vt.c:2013 RSP: ffff888098ec7878
CR2: 000000010000000e
---[ end trace 9ed48a5e027adfcd ]---

Crashes (29):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/12/09 17:12 linux-4.14.y a844dc4c5442 b31eda3d .config console log report syz C ci2-linux-4-14
2020/05/28 01:38 linux-4.14.y 4f68020fef1c 9072c126 .config console log report ci2-linux-4-14
2020/05/27 16:10 linux-4.14.y 4f68020fef1c 9072c126 .config console log report ci2-linux-4-14
2020/05/13 11:43 linux-4.14.y ab9dfda23248 9a6d42fb .config console log report ci2-linux-4-14
2020/05/11 20:10 linux-4.14.y ab9dfda23248 9eb09c40 .config console log report ci2-linux-4-14
2020/05/11 13:54 linux-4.14.y ab9dfda23248 f8f57555 .config console log report ci2-linux-4-14
2020/05/11 06:06 linux-4.14.y ab9dfda23248 8742a2b9 .config console log report ci2-linux-4-14
2020/05/05 18:53 linux-4.14.y d71f695ce745 4b76dd25 .config console log report ci2-linux-4-14
2020/02/23 22:22 linux-4.14.y 98db2bf27b9e d801cb02 .config console log report ci2-linux-4-14
2020/02/23 12:35 linux-4.14.y 98db2bf27b9e 2c36e7a7 .config console log report ci2-linux-4-14
2020/02/19 02:27 linux-4.14.y 98db2bf27b9e 135c18aa .config console log report ci2-linux-4-14
2020/02/19 01:01 linux-4.14.y 98db2bf27b9e 135c18aa .config console log report ci2-linux-4-14
2020/02/12 17:33 linux-4.14.y e0f8b8a65a47 84f4fc8a .config console log report ci2-linux-4-14
2020/02/09 05:42 linux-4.14.y e0f8b8a65a47 06150bf1 .config console log report ci2-linux-4-14
2020/02/01 22:41 linux-4.14.y 9fa690a2a016 2274ad39 .config console log report ci2-linux-4-14
2020/01/28 04:44 linux-4.14.y 9a95f25269bd 56cd6c9b .config console log report ci2-linux-4-14
2020/01/25 08:16 linux-4.14.y 8bac50406cca 2e95ab33 .config console log report ci2-linux-4-14
2020/01/23 15:47 linux-4.14.y 8bac50406cca 11ebf937 .config console log report ci2-linux-4-14
2020/01/23 15:10 linux-4.14.y 8bac50406cca 11ebf937 .config console log report ci2-linux-4-14
2020/01/15 16:33 linux-4.14.y c04fc6fa5c96 069a5a44 .config console log report ci2-linux-4-14
2020/01/15 15:34 linux-4.14.y c04fc6fa5c96 069a5a44 .config console log report ci2-linux-4-14
2020/01/13 12:12 linux-4.14.y 6d0c334a400d 99565c1a .config console log report ci2-linux-4-14
2020/01/12 13:03 linux-4.14.y 6d0c334a400d 31290a45 .config console log report ci2-linux-4-14
2020/01/10 15:51 linux-4.14.y b0cdffaa546e 532ec44e .config console log report ci2-linux-4-14
2020/01/10 14:37 linux-4.14.y b0cdffaa546e 532ec44e .config console log report ci2-linux-4-14
2020/01/09 04:04 linux-4.14.y 84f5ad468100 ddc3e859 .config console log report ci2-linux-4-14
2020/01/08 10:30 linux-4.14.y 84f5ad468100 ddc3e859 .config console log report ci2-linux-4-14
2019/12/30 16:42 linux-4.14.y e1f7d50ae3a3 6b36d338 .config console log report ci2-linux-4-14
2019/12/13 06:42 linux-4.14.y a844dc4c5442 2a752b7c .config console log report ci2-linux-4-14
* Struck through repros no longer work on HEAD.