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BUG: unable to handle kernel paging request in insert_char

Status: closed as dup on 2020/07/27 22:45
Subsystems: serial
[Documentation on labels]
Reported-by: syzbot+6a8d618862e1fc55313d@syzkaller.appspotmail.com
First crash: 1807d, last: 1608d
Cause bisection: the issue happens on the oldest tested release (bisect log)
Crash: general protection fault in insert_char (log)
Repro: C syz .config
  
Fix bisection: fixed by (bisect log) :
commit ce684552a266cb1c7cc2f7e623f38567adec6653
Author: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Date: Sun Jul 12 11:10:12 2020 +0000

  vt: Reject zero-sized screen buffer size.

  
▶ ▼ Duplicate of
Title Repro Cause bisect Fix bisect Count Last Reported
general protection fault in do_con_write C done 10703 1579d 1814d
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
BUG: unable to handle kernel paging request in insert_char 0 (3) 2020/07/27 21:26
▶ ▼ 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 insert_char C done 46 1590d 1811d 1/1 fixed on 2020/08/14 11:39
linux-4.14 BUG: unable to handle kernel paging request in insert_char C inconclusive 21 1577d 1805d 0/1 upstream: reported C repro on 2019/12/13 18:49

Sample crash report:
BUG: unable to handle page fault for address: 000000010000000e
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD a0297067 P4D a0297067 PUD 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 8954 Comm: syz-executor069 Not tainted 5.5.0-rc1-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:insert_char+0x23d/0x400 drivers/tty/vt/vt.c:840
Code: 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 01 0f 8e 1e 01 00 00 d1 eb 41 0f b7 85 c8 03 00 00 4c 89 ff 89 d9 <f3> 66 ab 49 8d bd 78 04 00 00 48 b8 00 00 00 00 00 fc ff df 48 89
RSP: 0018:ffffc90001d87858 EFLAGS: 00010202
RAX: 0000000000000720 RBX: 0000000000000001 RCX: 0000000000000001
RDX: 1ffff11011ed1879 RSI: 000000010000000e RDI: 000000010000000e
RBP: ffffc90001d878a0 R08: ffff88809aaf0180 R09: ffff88809aaf0a10
R10: fffffbfff14f3388 R11: ffffffff8a799c47 R12: 0000000000000000
R13: ffff88808f68c000 R14: ffff88808f68c334 R15: 000000010000000e
FS:  0000000000b30880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000010000000e CR3: 0000000096506000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 csi_at drivers/tty/vt/vt.c:1964 [inline]
 do_con_trol+0x41a6/0x61b0 drivers/tty/vt/vt.c:2431
 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: 0033:0x4404f9
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 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 5b 14 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fff33c5bfe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004404f9
RDX: 0000000000000078 RSI: 0000000020000000 RDI: 0000000000000004
RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401de0
R13: 0000000000401e70 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
CR2: 000000010000000e
---[ end trace 763703d908dc8dbd ]---
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:insert_char+0x23d/0x400 drivers/tty/vt/vt.c:840
Code: 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 01 0f 8e 1e 01 00 00 d1 eb 41 0f b7 85 c8 03 00 00 4c 89 ff 89 d9 <f3> 66 ab 49 8d bd 78 04 00 00 48 b8 00 00 00 00 00 fc ff df 48 89
RSP: 0018:ffffc90001d87858 EFLAGS: 00010202
RAX: 0000000000000720 RBX: 0000000000000001 RCX: 0000000000000001
RDX: 1ffff11011ed1879 RSI: 000000010000000e RDI: 000000010000000e
RBP: ffffc90001d878a0 R08: ffff88809aaf0180 R09: ffff88809aaf0a10
R10: fffffbfff14f3388 R11: ffffffff8a799c47 R12: 0000000000000000
R13: ffff88808f68c000 R14: ffff88808f68c334 R15: 000000010000000e
FS:  0000000000b30880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000233afd0 CR3: 0000000096506000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (173):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/12/17 01:18 upstream 510c9788991c b80769fc .config console log report syz C ci-upstream-kasan-gce-root
2019/12/17 00:35 upstream 510c9788991c b80769fc .config console log report syz C ci-upstream-kasan-gce-selinux-root
2019/12/16 21:38 upstream 510c9788991c b80769fc .config console log report syz C ci-upstream-kasan-gce
2019/12/17 00:10 upstream 510c9788991c b80769fc .config console log report syz C ci-upstream-kasan-gce-386
2019/12/27 01:20 linux-next 7ddd09fc4b74 be5c2c81 .config console log report syz C ci-upstream-linux-next-kasan-gce-root
2020/06/26 23:43 upstream 4a21185cda0f aea82c00 .config console log report ci-upstream-kasan-gce
2020/06/11 12:47 upstream 7ae77150d94d 3ab7a05a .config console log report ci-upstream-kasan-gce-selinux-root
2020/06/08 15:06 upstream 7ae77150d94d 7604bb03 .config console log report ci-upstream-kasan-gce-selinux-root
2020/06/08 02:35 upstream 7ae77150d94d 7751efd0 .config console log report ci-upstream-kasan-gce-selinux-root
2020/05/18 14:52 upstream b9bbe6ed63b2 684d3606 .config console log report ci-upstream-kasan-gce-root
2020/05/06 20:00 upstream 3c40cdb0e93e 4618eb2d .config console log report ci-upstream-kasan-gce-root
2020/05/01 20:26 upstream 052c467cb587 bc734e7a .config console log report ci-upstream-kasan-gce-root
2020/04/29 14:38 upstream 96c9a7802af7 496a08ae .config console log report ci-upstream-kasan-gce
2020/04/28 21:47 upstream 3f777e19d171 e3ecea2e .config console log report ci-upstream-kasan-gce
2020/04/27 22:34 upstream 51184ae37e05 0ce7569e .config console log report ci-upstream-kasan-gce-selinux-root
2020/04/26 16:54 upstream b2768df24ec4 99b258dd .config console log report ci-upstream-kasan-gce
2020/04/26 04:42 upstream b2768df24ec4 99b258dd .config console log report ci-upstream-kasan-gce
2020/04/26 03:21 upstream b2768df24ec4 99b258dd .config console log report ci-upstream-kasan-gce
2020/04/26 02:11 upstream b2768df24ec4 b8bb8e5f .config console log report ci-upstream-kasan-gce-root
2020/04/26 00:50 upstream b2768df24ec4 b8bb8e5f .config console log report ci-upstream-kasan-gce
2020/04/25 03:39 upstream b4f633221f0a 03d97a1b .config console log report ci-upstream-kasan-gce
2020/04/02 05:51 upstream 919dce24701f a34e2c33 .config console log report ci-upstream-kasan-gce-selinux-root
2020/04/01 02:05 upstream 56a451b78067 a34e2c33 .config console log report ci-upstream-kasan-gce-root
2020/03/29 17:56 upstream e595dd94515e 05736b29 .config console log report ci-upstream-kasan-gce-root
2020/03/28 12:48 upstream 69c5eea3128e f1ebdfba .config console log report ci-upstream-kasan-gce-root
2020/03/25 06:51 upstream 76ccd234269b 41f049cc .config console log report ci-upstream-kasan-gce-root
2020/03/07 00:38 upstream fb279f4e2386 fd2a5f28 .config console log report ci-upstream-kasan-gce-root
2020/02/14 22:23 upstream 2019fc96af22 5d7b90f1 .config console log report ci-upstream-kasan-gce-selinux-root
2020/02/14 14:36 upstream b19e8c684703 5d7b90f1 .config console log report ci-upstream-kasan-gce-selinux-root
2020/02/04 05:42 upstream 754beeec1d90 93e5e335 .config console log report ci-upstream-kasan-gce
2020/02/03 20:59 upstream 754beeec1d90 93e5e335 .config console log report ci-upstream-kasan-gce
2020/01/28 17:52 upstream b0be0eff1a5a c8e81ce4 .config console log report ci-upstream-kasan-gce
2020/01/28 09:24 upstream b0be0eff1a5a 56cd6c9b .config console log report ci-upstream-kasan-gce
2020/01/27 21:05 upstream d5226fa6dbae 56cd6c9b .config console log report ci-upstream-kasan-gce-root
2020/01/27 13:49 upstream d5226fa6dbae dd56146d .config console log report ci-upstream-kasan-gce
2020/01/27 08:56 upstream a45ea48e2bcd dd56146d .config console log report ci-upstream-kasan-gce
2020/01/26 21:08 upstream a45ea48e2bcd dd56146d .config console log report ci-upstream-kasan-gce-root
2020/01/24 20:38 upstream 6381b442836e 2e95ab33 .config console log report ci-upstream-kasan-gce
2020/01/24 20:15 upstream 6381b442836e 2e95ab33 .config console log report ci-upstream-kasan-gce
2020/01/24 00:04 upstream 4703d9119972 2e95ab33 .config console log report ci-upstream-kasan-gce
2019/12/11 05:19 upstream 6794862a16ef 101194eb .config console log report ci-upstream-kasan-gce
2020/06/07 14:27 upstream 7ae77150d94d 2c2b926c .config console log report ci-upstream-kasan-gce-386
2020/06/07 11:36 upstream 7ae77150d94d 2c2b926c .config console log report ci-upstream-kasan-gce-386
2020/02/03 18:03 upstream 754beeec1d90 93e5e335 .config console log report ci-upstream-kasan-gce-386
2020/01/28 11:26 upstream b0be0eff1a5a 56cd6c9b .config console log report ci-upstream-kasan-gce-386
2020/05/17 04:18 linux-next ac935d227366 37bccd4e .config console log report ci-upstream-linux-next-kasan-gce-root
2020/05/17 00:45 linux-next ac935d227366 37bccd4e .config console log report ci-upstream-linux-next-kasan-gce-root
2020/05/02 23:54 linux-next ac935d227366 5457883a .config console log report ci-upstream-linux-next-kasan-gce-root
2020/05/02 12:49 linux-next ac935d227366 58da4c35 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/05/01 18:45 linux-next ac935d227366 bc734e7a .config console log report ci-upstream-linux-next-kasan-gce-root
2020/05/01 07:19 linux-next ac935d227366 a4d01b80 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/02/13 17:24 linux-next 51d5d207918d c5ed587f .config console log report ci-upstream-linux-next-kasan-gce-root
2020/02/10 07:45 linux-next 2981de746b18 35f5e45e .config console log report ci-upstream-linux-next-kasan-gce-root
* Struck through repros no longer work on HEAD.