RSP: 002b:00007f351d2f2c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f351d2f2c90 RCX: 00000000004582b9 RDX: 0000000020000100 RSI: 0000000000005423 RDI: 0000000000000005 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f351d2f36d4 R13: 00000000004c2564 R14: 00000000004d52d0 R15: 0000000000000006 BUG: unable to handle kernel paging request at fffffffffffffff4 #PF error: [normal kernel read fault] PGD 8874067 P4D 8874067 PUD 8876067 PMD 0 Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 10836 Comm: syz-executor.2 Not tainted 5.1.0-rc3+ #52 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 30 39 1c fd 4d 85 e4 74 77 e8 26 39 1c 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 01 39 1c fd 4c 89 ef e8 79 04 54 fd RSP: 0018:ffff888059faf9f0 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: fffffffffffffff4 RCX: ffffc9000a22d000 RDX: 1ffffffffffffffe RSI: ffffffff845455da RDI: fffffffffffffff4 RBP: ffff888059fafa00 R08: ffff8880926b2440 R09: ffff8880926b2d30 R10: 0000000000000000 R11: 0000000000000000 R12: fffffffffffffff4 R13: ffff888062aeb680 R14: 00000000ffffff97 R15: ffff8880673f2a00 FS: 00007f351d2f3700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffffffffffff4 CR3: 000000008d821000 CR4: 00000000001406e0 DR0: 000000000000b8c4 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 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: 0033:0x4582b9 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:00007f351d2f2c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f351d2f2c90 RCX: 00000000004582b9 RDX: 0000000020000100 RSI: 0000000000005423 RDI: 0000000000000005 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f351d2f36d4 R13: 00000000004c2564 R14: 00000000004d52d0 R15: 0000000000000006 Modules linked in: CR2: fffffffffffffff4 ---[ end trace df52f6555c779465 ]--- RIP: 0010:slhc_free+0x31/0xb0 drivers/net/slip/slhc.c:159 Code: 54 49 89 fc e8 30 39 1c fd 4d 85 e4 74 77 e8 26 39 1c 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 01 39 1c fd 4c 89 ef e8 79 04 54 fd RSP: 0018:ffff888059faf9f0 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: fffffffffffffff4 RCX: ffffc9000a22d000 RDX: 1ffffffffffffffe RSI: ffffffff845455da RDI: fffffffffffffff4 RBP: ffff888059fafa00 R08: ffff8880926b2440 R09: ffff8880926b2d30 R10: 0000000000000000 R11: 0000000000000000 R12: fffffffffffffff4 R13: ffff888062aeb680 R14: 00000000ffffff97 R15: ffff8880673f2a00 FS: 00007f351d2f3700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffffffffffff4 CR3: 000000008d821000 CR4: 00000000001406e0 DR0: 000000000000b8c4 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400