bisecting fixing commit since c04fc6fa5c96ec57316527b2228fa31f26494abe
building syzkaller on f9b6950728295eb8f52b05a0d9e5dccd99f93eaa
testing commit c04fc6fa5c96ec57316527b2228fa31f26494abe with gcc (GCC) 8.1.0
kernel signature: f2734e5a90c86720b92067ed884bde5daa1a336a7a7526b65fe47c0b2f0c0916
all runs: crashed: BUG: unable to handle kernel paging request in csi_J
testing current HEAD c10b57a567e4333b9fdf60b5ec36de9859263ca2
testing commit c10b57a567e4333b9fdf60b5ec36de9859263ca2 with gcc (GCC) 8.1.0
kernel signature: 272fada8820d1d4cab6c6885f21507c92d1081a66c1ded26a5e3473e0a22c0cf
all runs: crashed: BUG: unable to handle kernel paging request in csi_J
revisions tested: 2, total time: 23m53.381790801s (build: 17m7.435067065s, test: 6m14.210223365s)
the crash still happens on HEAD
commit msg: Linux 4.14.176
crash: BUG: unable to handle kernel paging request in csi_J
IPv6: ADDRCONF(NETDEV_UP): macvlan0: link is not ready
IPv6: ADDRCONF(NETDEV_UP): macvlan1: link is not ready
IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready
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_J+0x2f1/0x540 drivers/tty/vt/vt.c:1208
PGD a5617067 P4D a5617067 PUD 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 7695 Comm: syz-executor.5 Not tainted 4.14.176-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff888084dd4000 task.stack: ffff888089788000
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_J+0x2f1/0x540 drivers/tty/vt/vt.c:1208
RSP: 0018:ffff88808978f788 EFLAGS: 00010202
RAX: 0000000000000720 RBX: ffff88808c46b700 RCX: 0000000000000001
RDX: 7fffffff80000001 RSI: 000000010000000e RDI: 000000010000000e
RBP: ffff88808978f7b8 R08: 0000000000000001 R09: ffff88808c46b700
R10: 00000000000000c8 R11: ffff888084dd4000 R12: ffff88808c46bbf8
R13: ffff88808c46bac8 R14: ffff88808c46ae80 R15: ffff88808c46bb00
FS:  00007fe621a19700(0000) GS:ffff8880aec00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000010000000e CR3: 00000000a5232000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 do_con_trol+0x2609/0x61a0 drivers/tty/vt/vt.c:2023
 do_con_write.part.22+0x9bc/0x19c0 drivers/tty/vt/vt.c:2447
 do_con_write drivers/tty/vt/vt.c:2218 [inline]
 con_write+0x1f/0x80 drivers/tty/vt/vt.c:2798
 process_output_block drivers/tty/n_tty.c:595 [inline]
 n_tty_write+0x498/0x1040 drivers/tty/n_tty.c:2333
 do_tty_write drivers/tty/tty_io.c:959 [inline]
 tty_write+0x346/0x770 drivers/tty/tty_io.c:1043
 __vfs_write+0xdb/0x840 fs/read_write.c:480
 vfs_write+0x150/0x4f0 fs/read_write.c:544
 SYSC_write fs/read_write.c:590 [inline]
 SyS_write+0x100/0x250 fs/read_write.c:582
 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45aff9
RSP: 002b:00007fe621a18c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fe621a196d4 RCX: 000000000045aff9
RDX: 0000000000000078 RSI: 0000000020000000 RDI: 0000000000000004
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000c60 R14: 00000000004cd0b9 R15: 000000000075bf2c
Code: ff df 4c 89 e9 48 c1 e9 03 0f b6 04 01 84 c0 74 08 3c 01 0f 8e e8 01 00 00 89 d1 0f b7 83 c8 03 00 00 48 89 f7 81 e1 ff ff ff 7f <f3> 66 ab 48 b8 00 00 00 00 00 fc ff df 4c 89 e1 48 c1 e9 03 80 
RIP: memset16 arch/x86/include/asm/string_64.h:58 [inline] RSP: ffff88808978f788
RIP: scr_memsetw include/linux/vt_buffer.h:36 [inline] RSP: ffff88808978f788
RIP: csi_J+0x2f1/0x540 drivers/tty/vt/vt.c:1208 RSP: ffff88808978f788
CR2: 000000010000000e
---[ end trace dda27d5174277359 ]---