------------[ cut here ]------------
remove_proc_entry: removing non-empty directory 'net/rpc', leaking at least 'use-gss-proxy'
WARNING: CPU: 0 PID: 21 at fs/proc/generic.c:681 remove_proc_entry+0x367/0x410 fs/proc/generic.c:681
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 21 Comm: kworker/u4:1 Not tainted 5.1.0-next-20190513 #6
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x172/0x1f0 lib/dump_stack.c:113
 panic+0x2cb/0x75a kernel/panic.c:218
 __warn.cold+0x20/0x47 kernel/panic.c:575
 report_bug+0x263/0x2b0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:179 [inline]
 fixup_bug arch/x86/kernel/traps.c:174 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:272
 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:291
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:972
RIP: 0010:remove_proc_entry+0x367/0x410 fs/proc/generic.c:681
Code: 00 00 00 48 89 fa 48 c1 ea 03 80 3c 02 00 75 4c 49 8b 95 d0 00 00 00 48 c7 c6 80 85 97 87 48 c7 c7 00 85 97 87 e8 c7 b1 6d ff <0f> 0b e9 4b fe ff ff e8 6d 54 d4 ff e9 b5 fd ff ff e8 23 55 d4 ff
RSP: 0018:ffff8880a9a0fb10 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 1ffff11015341f64 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815b20a6 RDI: ffffed1015341f54
RBP: ffff8880a9a0fbc0 R08: ffff8880a99fa580 R09: ffff8880a99fae70
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88808c6ac900
R13: ffff88809a705200 R14: ffff88808c6ac9b0 R15: dffffc0000000000
 rpc_proc_exit+0x3e/0x50 net/sunrpc/stats.c:335
 sunrpc_exit_net+0x187/0x2d0 net/sunrpc/sunrpc_syms.c:73
 ops_exit_list.isra.0+0xb0/0x160 net/core/net_namespace.c:153
 cleanup_net+0x3fb/0x960 net/core/net_namespace.c:552
 process_one_work+0x98e/0x1790 kernel/workqueue.c:2268
 worker_thread+0x98/0xe40 kernel/workqueue.c:2414
 kthread+0x357/0x430 kernel/kthread.c:254
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Kernel Offset: disabled
Rebooting in 86400 seconds..