RAX: ffffffffffffffda RBX: 00007f6ec4f5dc90 RCX: 0000000000458c29
RDX: 00000000200000c0 RSI: 0000000000005423 RDI: 0000000000000003
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6ec4f5e6d4
R13: 00000000004c2f76 R14: 00000000004d5fb0 R15: 0000000000000005
BUG: unable to handle kernel paging request at fffffffffffffff4
#PF error: [normal kernel read fault]
PGD 8870067 P4D 8870067 PUD 8872067 PMD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 20524 Comm: syz-executor.2 Not tainted 5.1.0-rc4-next-20190412 #24
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:slhc_free+0x31/0xb0 drivers/net/slip/slhc.c:159
Code: 54 49 89 fc e8 10 76 17 fd 4d 85 e4 74 77 e8 06 76 17 fd 4c 89 e2 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 75 6d <4d> 8b 2c 24 4d 85 ed 74 0d e8 e1 75 17 fd 4c 89 ef e8 e9 44 50 fd
RSP: 0018:ffff8880592879f0 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: fffffffffffffff4 RCX: ffffc9000a23d000
RDX: 1ffffffffffffffe RSI: ffffffff845912ea RDI: fffffffffffffff4
RBP: ffff888059287a00 R08: ffff88809c3d6000 R09: ffff88809c3d68f0
R10: 0000000000000000 R11: 0000000000000000 R12: fffffffffffffff4
R13: ffff88809f4e3000 R14: 00000000ffffff97 R15: ffff88809730ed40
FS:  00007f6ec4f5e700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffff4 CR3: 00000000a83bd000 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+0xe16/0x1138 drivers/net/slip/slip.c:821
 tty_ldisc_open.isra.0+0x8b/0xe0 drivers/tty/tty_ldisc.c:469
 tty_set_ldisc+0x2d7/0x690 drivers/tty/tty_ldisc.c:596
 tiocsetd drivers/tty/tty_io.c:2332 [inline]
 tty_ioctl+0x5dc/0x15c0 drivers/tty/tty_io.c:2592
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:509 [inline]
 do_vfs_ioctl+0xd6e/0x1390 fs/ioctl.c:696
 ksys_ioctl+0xab/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+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x458c29
Code: ad b8 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 b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f6ec4f5dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f6ec4f5dc90 RCX: 0000000000458c29
RDX: 00000000200000c0 RSI: 0000000000005423 RDI: 0000000000000003
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6ec4f5e6d4
R13: 00000000004c2f76 R14: 00000000004d5fb0 R15: 0000000000000005
Modules linked in:
CR2: fffffffffffffff4
---[ end trace 062e966b7e07d82f ]---
RIP: 0010:slhc_free+0x31/0xb0 drivers/net/slip/slhc.c:159
Code: 54 49 89 fc e8 10 76 17 fd 4d 85 e4 74 77 e8 06 76 17 fd 4c 89 e2 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 75 6d <4d> 8b 2c 24 4d 85 ed 74 0d e8 e1 75 17 fd 4c 89 ef e8 e9 44 50 fd
RSP: 0018:ffff8880592879f0 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: fffffffffffffff4 RCX: ffffc9000a23d000
RDX: 1ffffffffffffffe RSI: ffffffff845912ea RDI: fffffffffffffff4
RBP: ffff888059287a00 R08: ffff88809c3d6000 R09: ffff88809c3d68f0
R10: 0000000000000000 R11: 0000000000000000 R12: fffffffffffffff4
R13: ffff88809f4e3000 R14: 00000000ffffff97 R15: ffff88809730ed40
FS:  00007f6ec4f5e700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffff4 CR3: 00000000a83bd000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400