------------[ cut here ]------------ refcount_t: addition on 0; use-after-free. WARNING: CPU: 0 PID: 9685 at lib/refcount.c:25 refcount_warn_saturate+0x169/0x1e0 lib/refcount.c:25 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 9685 Comm: syz-executor.3 Not tainted 5.6.0-rc3-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+0x188/0x20d lib/dump_stack.c:118 panic+0x2e3/0x75c kernel/panic.c:221 __warn.cold+0x2f/0x35 kernel/panic.c:582 report_bug+0x27b/0x2f0 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+0x12b/0x220 arch/x86/kernel/traps.c:267 do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:286 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027 RIP: 0010:refcount_warn_saturate+0x169/0x1e0 lib/refcount.c:25 Code: 06 31 ff 89 de e8 27 7e e4 fd 84 db 0f 85 36 ff ff ff e8 ea 7c e4 fd 48 c7 c7 e0 a2 51 88 c6 05 5f 8d d3 06 01 e8 1f 90 b6 fd <0f> 0b e9 17 ff ff ff e8 cb 7c e4 fd 0f b6 1d 44 8d d3 06 31 ff 89 RSP: 0018:ffffc90002b57d50 EFLAGS: 00010286 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff815bf411 RDI: fffff5200056af9c RBP: 0000000000000002 R08: ffff888066422200 R09: ffffed1015cc6659 R10: ffffed1015cc6658 R11: ffff8880ae6332c7 R12: ffff88805092a580 R13: ffff8880665b0104 R14: 0000000000000002 R15: ffff88805092a648 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+0xe86/0xfa0 net/core/sock.c:1669 inet_create net/ipv4/af_inet.c:321 [inline] inet_create+0x364/0xe00 net/ipv4/af_inet.c:247 __sock_create+0x3cb/0x730 net/socket.c:1433 sock_create net/socket.c:1484 [inline] __sys_socket+0xef/0x200 net/socket.c:1526 __do_sys_socket net/socket.c:1535 [inline] __se_sys_socket net/socket.c:1533 [inline] __x64_sys_socket+0x6f/0xb0 net/socket.c:1533 do_syscall_64+0xf6/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45eff7 Code: 00 00 00 49 89 ca b8 36 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 4a 8b fb ff c3 66 0f 1f 84 00 00 00 00 00 b8 29 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 2d 8b fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fff7ae4cda8 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045eff7 RDX: 0000000000000006 RSI: 0000000000000001 RDI: 0000000000000002 RBP: 0000000000001443 R08: 0000000000000000 R09: 000000000000000a R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff7ae4d4c0 R14: 00000000000fa011 R15: 00007fff7ae4d4d0 Kernel Offset: disabled Rebooting in 86400 seconds..