------------[ cut here ]------------ refcount_t: addition on 0; use-after-free. WARNING: CPU: 1 PID: 10006 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: 10006 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:ffffc9000638fbf0 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff815eae46 RDI: fffff52000c71f70 RBP: ffffc9000638fc00 R08: ffff88806562c000 R09: ffffed1015d26659 R10: ffffed1015d26658 R11: ffff8880ae9332c7 R12: 0000000000000002 R13: 0000000000000000 R14: ffff8880656b40c4 R15: ffff88805479cc88 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 inet_create net/ipv4/af_inet.c:321 [inline] inet_create+0x363/0xe10 net/ipv4/af_inet.c:247 __sock_create+0x3ce/0x730 net/socket.c:1433 sock_create net/socket.c:1484 [inline] __sys_socket+0x103/0x220 net/socket.c:1526 __do_compat_sys_socketcall net/compat.c:744 [inline] __se_compat_sys_socketcall net/compat.c:719 [inline] __ia32_compat_sys_socketcall+0x3c3/0x710 net/compat.c:719 do_syscall_32_irqs_on arch/x86/entry/common.c:337 [inline] do_fast_syscall_32+0x27b/0xe16 arch/x86/entry/common.c:408 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7faee39 Code: 1d 00 00 00 89 d3 5b 5e 5d c3 8b 04 24 c3 8b 1c 24 c3 8b 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:000000000868f700 EFLAGS: 00000202 ORIG_RAX: 0000000000000066 RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 000000000868f714 RDX: 0000000000000003 RSI: 0000000000042c14 RDI: 000000000868fe10 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Kernel Offset: disabled Rebooting in 86400 seconds..