------------[ cut here ]------------ refcount_t: addition on 0; use-after-free. WARNING: CPU: 1 PID: 17752 at lib/refcount.c:25 refcount_warn_saturate+0x174/0x1f0 lib/refcount.c:25 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 17752 Comm: syz-executor.2 Not tainted 5.6.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x197/0x210 lib/dump_stack.c:118 panic+0x2e3/0x75c kernel/panic.c:221 __warn.cold+0x2f/0x3e kernel/panic.c:582 report_bug+0x289/0x300 lib/bug.c:195 fixup_bug arch/x86/kernel/traps.c:174 [inline] fixup_bug arch/x86/kernel/traps.c:169 [inline] do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:267 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:286 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027 RIP: 0010:refcount_warn_saturate+0x174/0x1f0 lib/refcount.c:25 Code: 06 31 ff 89 de e8 2c 02 d3 fd 84 db 0f 85 33 ff ff ff e8 df 00 d3 fd 48 c7 c7 20 98 91 88 c6 05 e1 71 fe 06 01 e8 2b 47 a3 fd <0f> 0b e9 14 ff ff ff e8 c0 00 d3 fd 0f b6 1d c6 71 fe 06 31 ff 89 RSP: 0018:ffffc90005507ce0 EFLAGS: 00010286 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 000000000000a254 RSI: ffffffff815eae46 RDI: fffff52000aa0f8e RBP: ffffc90005507cf0 R08: ffff888047876400 R09: ffffed1015d26659 R10: ffffed1015d26658 R11: ffff8880ae9332c7 R12: 0000000000000002 R13: 0000000000000000 R14: ffff88805cd2a0c4 R15: ffff8880962480c8 refcount_add include/linux/refcount.h:191 [inline] refcount_inc include/linux/refcount.h:228 [inline] get_net include/net/net_namespace.h:241 [inline] sk_alloc+0xeb0/0xfd0 net/core/sock.c:1669 __netlink_create+0x6a/0x280 net/netlink/af_netlink.c:629 netlink_create+0x3a4/0x5d0 net/netlink/af_netlink.c:692 __sock_create+0x3ce/0x730 net/socket.c:1433 sock_create net/socket.c:1484 [inline] __sys_socket+0x103/0x220 net/socket.c:1526 __do_sys_socket net/socket.c:1535 [inline] __se_sys_socket net/socket.c:1533 [inline] __x64_sys_socket+0x73/0xb0 net/socket.c:1533 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c449 Code: ad b6 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 b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f735cfb0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 00007f735cfb16d4 RCX: 000000000045c449 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000010 RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000b60 R14: 00000000004cd54b R15: 000000000076bf2c Kernel Offset: disabled Rebooting in 86400 seconds..