R13: 00000000000003fa R14: 00000000006f8010 R15: 000000000000003c overlayfs: missing 'lowerdir' ------------[ cut here ]------------ refcount_t: increment on 0; use-after-free. WARNING: CPU: 1 PID: 7997 at lib/refcount.c:153 refcount_inc+0x47/0x50 lib/refcount.c:153 overlayfs: missing 'lowerdir' Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 7997 Comm: syz-executor2 Not tainted 4.16.0-rc6+ #43 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x24d lib/dump_stack.c:53 panic+0x1e4/0x41c kernel/panic.c:183 __warn+0x1dc/0x200 kernel/panic.c:547 report_bug+0x1f4/0x2b0 lib/bug.c:186 fixup_bug.part.10+0x37/0x80 arch/x86/kernel/traps.c:178 fixup_bug arch/x86/kernel/traps.c:247 [inline] do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:986 RIP: 0010:refcount_inc+0x47/0x50 lib/refcount.c:153 RSP: 0018:ffff8801b2ab7810 EFLAGS: 00010286 RAX: dffffc0000000008 RBX: ffff8801bd8d82c4 RCX: ffffffff815b423e RDX: 00000000000036ff RSI: ffffc9000990d000 RDI: 1ffff10036556e87 RBP: ffff8801b2ab7818 R08: ffffffff88583118 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801b2ab7aa8 R13: ffff88019cc237d3 R14: ffff8801bd8d82c0 R15: ffff88019cc23801 get_net include/net/net_namespace.h:204 [inline] sk_alloc+0x3f9/0x1440 net/core/sock.c:1540 smc_sock_alloc+0xc0/0x410 net/smc/af_smc.c:185 smc_create+0xbd/0x320 net/smc/af_smc.c:1402 __sock_create+0x4d4/0x850 net/socket.c:1285 sock_create net/socket.c:1325 [inline] SYSC_socketpair net/socket.c:1409 [inline] SyS_socketpair+0x1c0/0x6f0 net/socket.c:1366 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x454e79 RSP: 002b:00007f4f1f2f0c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000035 RAX: ffffffffffffffda RBX: 00007f4f1f2f16d4 RCX: 0000000000454e79 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 000000000000002b RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020001240 R11: 0000000000000246 R12: 00000000ffffffff R13: 000000000000063f R14: 00000000006fb688 R15: 0000000000000000 Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..