bisecting fixing commit since c04fc6fa5c96ec57316527b2228fa31f26494abe
building syzkaller on f9b6950728295eb8f52b05a0d9e5dccd99f93eaa
testing commit c04fc6fa5c96ec57316527b2228fa31f26494abe with gcc (GCC) 8.1.0
kernel signature: fc0572788e1c604b7cf1cd170cc7cb0ae05926b8aa5819c254cff0286a3a46ae
all runs: crashed: BUG: unable to handle kernel paging request in csi_J
testing current HEAD 12cd844a39ed16aa183a820a54fe6f9a0bb4cd14
testing commit 12cd844a39ed16aa183a820a54fe6f9a0bb4cd14 with gcc (GCC) 8.1.0
kernel signature: 09af3a0954849e648073f2502565977a038ccaf22a874c97b4d1e45706a2e5ad
all runs: crashed: BUG: unable to handle kernel paging request in csi_J
revisions tested: 2, total time: 25m15.742467059s (build: 17m51.628530531s, test: 6m39.06847711s)
the crash still happens on HEAD
commit msg: Linux 4.14.173
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:1195
PGD 794b5067 P4D 794b5067 PUD 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 7397 Comm: syz-executor.0 Not tainted 4.14.173-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff88807965a400 task.stack: ffff888088ea0000
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:1195
RSP: 0018:ffff888088ea7788 EFLAGS: 00010202
RAX: 0000000000000720 RBX: ffff888092888d80 RCX: 0000000000000001
RDX: 7fffffff80000001 RSI: 000000010000000e RDI: 000000010000000e
RBP: ffff888088ea77b8 R08: 0000000000000001 R09: ffff888092888d80
R10: 00000000000000c8 R11: ffff88807965a400 R12: ffff888092889278
R13: ffff888092889148 R14: ffff888099496bc0 R15: ffff888092889100
FS:  00007fa6d08e0700(0000) GS:ffff8880aec00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000010000000e CR3: 000000008aeeb000 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:2010
 do_con_write.part.22+0x9bc/0x19c0 drivers/tty/vt/vt.c:2434
 do_con_write drivers/tty/vt/vt.c:2205 [inline]
 con_write+0x1f/0x80 drivers/tty/vt/vt.c:2785
 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:00007fa6d08dfc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fa6d08e06d4 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: ffff888088ea7788
RIP: scr_memsetw include/linux/vt_buffer.h:36 [inline] RSP: ffff888088ea7788
RIP: csi_J+0x2f1/0x540 drivers/tty/vt/vt.c:1195 RSP: ffff888088ea7788
CR2: 000000010000000e
---[ end trace 44c26f0057b0c5b2 ]---