RAX: ffffffffffffffda RBX: 00007fc7e19f2c90 RCX: 0000000000457759
RDX: 0000000020000080 RSI: 0000000000005423 RDI: 0000000000000005
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc7e19f36d4
R13: 00000000004c18ff R14: 00000000004d3b28 R15: 0000000000000006
BUG: unable to handle kernel paging request at fffffffffffffff4
PGD 946d067 P4D 946d067 PUD 946f067 PMD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 24942 Comm: syz-executor5 Not tainted 4.20.0 #167
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:slhc_free+0x30/0xb0 drivers/net/slip/slhc.c:159
Code: 53 48 89 fb e8 71 04 ad fc 48 85 db 74 74 e8 67 04 ad fc 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 75 69 <4c> 8b 23 4d 85 e4 74 0d e8 43 04 ad fc 4c 89 e7 e8 bb e1 ef fc e8
RSP: 0018:ffff88817ad6f770 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: fffffffffffffff4 RCX: ffffc9000fecd000
RDX: 1ffffffffffffffe RSI: ffffffff84d15439 RDI: fffffffffffffff4
RBP: ffff88817ad6f780 R08: ffff8881ad9bcbb0 R09: 0000000000000006
R10: 0000000000000000 R11: ffff8881ad9bc2c0 R12: 00000000ffffff97
R13: ffff88817a430240 R14: ffff8881acb5ea80 R15: ffff8881843f1640
FS:  00007fc7e19f3700(0000) GS:ffff8881daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffff4 CR3: 00000001b06f9000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 sl_alloc_bufs drivers/net/slip/slip.c:196 [inline]
 slip_open+0xdee/0x1107 drivers/net/slip/slip.c:821
kobject: 'loop3' (000000008be44d72): kobject_uevent_env
 tty_ldisc_open.isra.1+0x8b/0xe0 drivers/tty/tty_ldisc.c:453
kobject: 'loop3' (000000008be44d72): fill_kobj_path: path = '/devices/virtual/block/loop3'
 tty_set_ldisc+0x2dc/0x6a0 drivers/tty/tty_ldisc.c:578
 tiocsetd drivers/tty/tty_io.c:2321 [inline]
 tty_ioctl+0x39d/0x17d0 drivers/tty/tty_io.c:2581
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:509 [inline]
 do_vfs_ioctl+0x1de/0x1790 fs/ioctl.c:696
 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:713
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl fs/ioctl.c:718 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457759
Code: fd b3 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 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fc7e19f2c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fc7e19f2c90 RCX: 0000000000457759
RDX: 0000000020000080 RSI: 0000000000005423 RDI: 0000000000000005
sg_write: data in/out 167162/1 bytes for SCSI command 0xff-- guessing data in;
   program syz-executor2 not setting count and/or reply_len properly
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc7e19f36d4
R13: 00000000004c18ff R14: 00000000004d3b28 R15: 0000000000000006
Modules linked in:
CR2: fffffffffffffff4
---[ end trace 004e021a5676c673 ]---
RIP: 0010:slhc_free+0x30/0xb0 drivers/net/slip/slhc.c:159
Code: 53 48 89 fb e8 71 04 ad fc 48 85 db 74 74 e8 67 04 ad fc 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 75 69 <4c> 8b 23 4d 85 e4 74 0d e8 43 04 ad fc 4c 89 e7 e8 bb e1 ef fc e8
kobject: 'hwsim171' (000000008b7d9b9c): kobject_add_internal: parent: 'mac80211_hwsim', set: 'devices'
RSP: 0018:ffff88817ad6f770 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: fffffffffffffff4 RCX: ffffc9000fecd000
RDX: 1ffffffffffffffe RSI: ffffffff84d15439 RDI: fffffffffffffff4
RBP: ffff88817ad6f780 R08: ffff8881ad9bcbb0 R09: 0000000000000006
R10: 0000000000000000 R11: ffff8881ad9bc2c0 R12: 00000000ffffff97
R13: ffff88817a430240 R14: ffff8881acb5ea80 R15: ffff8881843f1640
FS:  00007fc7e19f3700(0000) GS:ffff8881daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
kobject: 'hwsim171' (000000008b7d9b9c): kobject_uevent_env
CR2: fffffffffffffff4 CR3: 00000001b06f9000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400