RBP: 000000000072bea0 R08: 0000000020000940 R09: 0000000000000000 R10: 0000000020000900 R11: 0000000000000246 R12: 0000000000000014 R13: 0000000000000051 R14: 00000000006f2838 R15: 0000000000000028 ------------[ cut here ]------------ refcount_t: underflow; use-after-free. WARNING: CPU: 1 PID: 23141 at lib/refcount.c:187 refcount_sub_and_test+0x167/0x1b0 lib/refcount.c:187 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 23141 Comm: syz-executor2 Not tainted 4.16.0-rc7+ #373 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_sub_and_test+0x167/0x1b0 lib/refcount.c:187 RSP: 0018:ffff8801aa2df318 EFLAGS: 00010282 RAX: dffffc0000000008 RBX: 0000000000000000 RCX: ffffffff815b193e RDX: 0000000000040000 RSI: ffffc900026cc000 RDI: 1ffff1003545bde8 RBP: ffff8801aa2df3a8 R08: ffffffff88583158 R09: 0000000000000000 R10: ffff8801aa2df2d0 R11: 0000000000000000 R12: 1ffff1003545be64 R13: 00000000ffffffff R14: 0000000000000001 R15: ffff8801b4477260 refcount_dec_and_test+0x1a/0x20 lib/refcount.c:212 kref_put include/linux/kref.h:69 [inline] put_pid_ns+0x9d/0xc0 kernel/pid_namespace.c:192 free_nsproxy+0xfa/0x1f0 kernel/nsproxy.c:182 switch_task_namespaces+0x9d/0xc0 kernel/nsproxy.c:229 exit_task_namespaces+0x17/0x20 kernel/nsproxy.c:234 copy_process.part.38+0x3aba/0x4bd0 kernel/fork.c:1988 copy_process kernel/fork.c:1606 [inline] _do_fork+0x1f7/0xf70 kernel/fork.c:2087 SYSC_clone kernel/fork.c:2194 [inline] SyS_clone+0x37/0x50 kernel/fork.c:2188 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x454e79 RSP: 002b:00007f935ae4bc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007f935ae4c6d4 RCX: 0000000000454e79 RDX: 00000000200008c0 RSI: 0000000020000800 RDI: 000000002000c100 RBP: 000000000072bea0 R08: 0000000020000940 R09: 0000000000000000 R10: 0000000020000900 R11: 0000000000000246 R12: 0000000000000014 R13: 0000000000000051 R14: 00000000006f2838 R15: 0000000000000028 Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..