ODEBUG: object ffff8801db307ce8 is NOT on stack ffff8801a62a0000, but annotated kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 0 PID: 15369 Comm: syz-executor4 Not tainted 4.9.119-g9dc978d #75 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801cea11800 task.stack: ffff8801987c0000 RIP: 0010:[] [] __lock_acquire+0xa1b/0x4070 kernel/locking/lockdep.c:3224 RSP: 0018:ffff8801987c76a0 EFLAGS: 00010006 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000014 RSI: 0000000000000000 RDI: 00000000000000a0 RBP: ffff8801987c7848 R08: 0000000000000001 R09: 0000000000000000 R10: ffff8801cea11800 R11: 0000000000000001 R12: 0000000000000001 R13: 0000000000000000 R14: 00000000000000a0 R15: 0000000000000000 FS: 00007f25edb01700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000280 CR3: 00000001d6d31000 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: dffffc0000000000 ffffffff85c257c8 0000000000000282 ffff8801987c76d8 ffffffff812358f6 0000000000000286 ffffffff85c257c8 ffff8801987c76e8 0000000000000286 ffff8801987c7708 ffffffff839fc3b5 0000000000092a00 Call Trace: [] lock_acquire+0x130/0x3e0 kernel/locking/lockdep.c:3756 [] __raw_spin_lock include/linux/spinlock_api_smp.h:144 [inline] [] _raw_spin_lock+0x36/0x50 kernel/locking/spinlock.c:151 [] spin_lock include/linux/spinlock.h:302 [inline] [] l2tp_xmit_skb+0x38b/0xf60 net/l2tp/l2tp_core.c:1233 [] pppol2tp_sendmsg+0x4e0/0x790 net/l2tp/l2tp_ppp.c:339 [] sock_sendmsg_nosec net/socket.c:636 [inline] [] sock_sendmsg+0xcc/0x110 net/socket.c:646 [] ___sys_sendmsg+0x47a/0x840 net/socket.c:1970 [] __sys_sendmmsg+0x161/0x3d0 net/socket.c:2060 [] SYSC_sendmmsg net/socket.c:2091 [inline] [] SyS_sendmmsg+0x35/0x60 net/socket.c:2086 [] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282 [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Code: 25 28 00 00 00 0f 85 17 27 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 <80> 3c 02 00 0f 85 51 27 00 00 49 81 3e a0 8c e9 84 0f 84 08 f7 RIP [] __lock_acquire+0xa1b/0x4070 kernel/locking/lockdep.c:3224 RSP ---[ end trace c6681a91e8d241ef ]---