bisecting fixing commit since db5b9190ff8202b609fe802ccde41cb28669389f
building syzkaller on f9b6950728295eb8f52b05a0d9e5dccd99f93eaa
testing commit db5b9190ff8202b609fe802ccde41cb28669389f with gcc (GCC) 8.1.0
kernel signature: 8fb51575c4c5bd1d190f5f335fa98f4c985175194dba28e94cbb5d0e7e5fa6bf
all runs: crashed: BUG: unable to handle kernel paging request in csi_J
testing current HEAD 2d16cf4817bc6944a2adb5bf4db607c8258e87da
testing commit 2d16cf4817bc6944a2adb5bf4db607c8258e87da with gcc (GCC) 8.1.0
kernel signature: 01963a4dbe876b2add0596c9a323aa5b923506c4150133343ab8cc5496597f40
all runs: crashed: BUG: unable to handle kernel paging request in csi_J
revisions tested: 2, total time: 25m55.04737881s (build: 18m48.649494413s, test: 6m5.401682709s)
the crash still happens on HEAD
commit msg: Linux 4.19.125
crash: BUG: unable to handle kernel paging request in csi_J
IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready
device veth1_vlan entered promiscuous mode
BUG: unable to handle kernel paging request at 000000010000000e
PGD 8b95b067 P4D 8b95b067 PUD 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 7735 Comm: syz-executor.2 Not tainted 4.19.125-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:43 [inline]
RIP: 0010:scr_memsetw include/linux/vt_buffer.h:36 [inline]
RIP: 0010:csi_J+0x292/0xad0 drivers/tty/vt/vt.c:1560
Code: df 48 89 f9 48 c1 e9 03 0f b6 04 01 84 c0 74 08 3c 01 0f 8e 58 06 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 f9 48 c1 e9 03 80 3c
RSP: 0018:ffff888084277718 EFLAGS: 00010202
RAX: 0000000000000720 RBX: ffff88808b8cab80 RCX: 0000000000000001
RDX: 7fffffff80000001 RSI: 000000010000000e RDI: 000000010000000e
RBP: ffff888084277758 R08: 0000000000000000 R09: ffff88808b8cab80
R10: ffffed1015d64732 R11: 000000000000004a R12: 0000000000000000
R13: ffff88808b8cb090 R14: ffff8880a9acd740 R15: ffff88808b8cb078
FS:  00007fd8e3d13700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000010000000e CR3: 000000008b1b5000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 do_con_trol+0x29be/0x6360 drivers/tty/vt/vt.c:2378
 do_con_write.part.21+0xad0/0x1aa0 drivers/tty/vt/vt.c:2803
 do_con_write drivers/tty/vt/vt.c:2571 [inline]
 con_write+0x1f/0x80 drivers/tty/vt/vt.c:3138
 process_output_block drivers/tty/n_tty.c:593 [inline]
 n_tty_write+0x4a4/0x1060 drivers/tty/n_tty.c:2331
 do_tty_write drivers/tty/tty_io.c:960 [inline]
 tty_write+0x346/0x770 drivers/tty/tty_io.c:1044
 __vfs_write+0xe3/0x890 fs/read_write.c:485
 vfs_write+0x150/0x4d0 fs/read_write.c:549
 ksys_write+0x103/0x260 fs/read_write.c:599
 __do_sys_write fs/read_write.c:611 [inline]
 __se_sys_write fs/read_write.c:608 [inline]
 __x64_sys_write+0x6e/0xb0 fs/read_write.c:608
 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293
 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:00007fd8e3d12c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fd8e3d136d4 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
Modules linked in:
CR2: 000000010000000e
---[ end trace 8e28ddff817df7ff ]---
RIP: 0010:memset16 arch/x86/include/asm/string_64.h:43 [inline]
RIP: 0010:scr_memsetw include/linux/vt_buffer.h:36 [inline]
RIP: 0010:csi_J+0x292/0xad0 drivers/tty/vt/vt.c:1560
Code: df 48 89 f9 48 c1 e9 03 0f b6 04 01 84 c0 74 08 3c 01 0f 8e 58 06 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 f9 48 c1 e9 03 80 3c
RSP: 0018:ffff888084277718 EFLAGS: 00010202
RAX: 0000000000000720 RBX: ffff88808b8cab80 RCX: 0000000000000001
RDX: 7fffffff80000001 RSI: 000000010000000e RDI: 000000010000000e
RBP: ffff888084277758 R08: 0000000000000000 R09: ffff88808b8cab80
R10: ffffed1015d64732 R11: 000000000000004a R12: 0000000000000000
R13: ffff88808b8cb090 R14: ffff8880a9acd740 R15: ffff88808b8cb078
FS:  00007fd8e3d13700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000010000000e CR3: 000000008b1b5000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400