RDX: 0000000020000100 RSI: 0000000000005423 RDI: 0000000000000005 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f23ff96a6d4 R13: 00000000004c3215 R14: 00000000004d65a8 R15: 0000000000000006 kobject: 'loop2' (ffff8880a495a0a0): fill_kobj_path: path = '/devices/virtual/block/loop2' BUG: unable to handle kernel paging request at fffffffffffffff4 IP: slhc_free+0x31/0xb0 drivers/net/slip/slhc.c:159 PGD 766d067 P4D 766d067 PUD 766f067 PMD 0 Oops: 0000 [#1] PREEMPT SMP KASAN kobject: 'loop5' (ffff8880a4aa1320): kobject_uevent_env Modules linked in: CPU: 1 PID: 19913 Comm: syz-executor.0 Not tainted 4.14.113 #3 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880927f4400 task.stack: ffff88805ebe0000 kobject: 'loop5' (ffff8880a4aa1320): fill_kobj_path: path = '/devices/virtual/block/loop5' RIP: 0010:slhc_free+0x31/0xb0 drivers/net/slip/slhc.c:159 RSP: 0018:ffff88805ebe7ae8 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: fffffffffffffff4 RCX: ffffc90007247000 RDX: 1ffffffffffffffe RSI: ffffffff83d4f8da RDI: fffffffffffffff4 RBP: ffff88805ebe7af8 R08: ffff8880927f4400 R09: ffff8880927f4cf0 R10: 0000000000000000 R11: 0000000000000000 R12: fffffffffffffff4 R13: ffff888095e818c8 R14: ffff88808d1cd400 R15: ffff888095e80e00 kobject: 'loop2' (ffff8880a495a0a0): kobject_uevent_env FS: 00007f23ff96a700(0000) GS:ffff8880aef00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffffffffffff4 CR3: 0000000090d3d000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: sl_alloc_bufs drivers/net/slip/slip.c:197 [inline] slip_open+0xc96/0xfb5 drivers/net/slip/slip.c:826 kobject: 'loop2' (ffff8880a495a0a0): fill_kobj_path: path = '/devices/virtual/block/loop2' tty_ldisc_open.isra.0+0x75/0xc0 drivers/tty/tty_ldisc.c:474 tty_set_ldisc+0x29a/0x610 drivers/tty/tty_ldisc.c:599 tiocsetd drivers/tty/tty_io.c:2351 [inline] tty_ioctl+0x976/0x1340 drivers/tty/tty_io.c:2595 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x7b9/0x1070 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692 do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 kobject: 'loop5' (ffff8880a4aa1320): kobject_uevent_env RIP: 0033:0x458da9 kobject: 'loop5' (ffff8880a4aa1320): fill_kobj_path: path = '/devices/virtual/block/loop5' RSP: 002b:00007f23ff969c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f23ff969c90 RCX: 0000000000458da9 RDX: 0000000020000100 RSI: 0000000000005423 RDI: 0000000000000005 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f23ff96a6d4 R13: 00000000004c3215 R14: 00000000004d65a8 R15: 0000000000000006 Code: 41 54 49 89 fc e8 30 ee 87 fd 4d 85 e4 74 77 e8 26 ee 87 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 ee 87 fd 4c 89 ef e8 69 69 b1 RIP: slhc_free+0x31/0xb0 drivers/net/slip/slhc.c:159 RSP: ffff88805ebe7ae8 CR2: fffffffffffffff4 ---[ end trace 36c7d12a4f982190 ]---