IPVS: ftp: loaded support on port[0] = 21
DEBUG_LOCKS_WARN_ON(mutex_is_locked(lock))
------------[ cut here ]------------
WARNING: CPU: 0 PID: 14806 at kernel/locking/mutex-debug.c:103 mutex_destroy.cold+0x13/0x1a kernel/locking/mutex-debug.c:103
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 14806 Comm: syz-executor.1 Not tainted 4.14.198-syzkaller #0
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+0x1b2/0x283 lib/dump_stack.c:58
 panic+0x1f9/0x42d kernel/panic.c:183
 __warn.cold+0x20/0x4b kernel/panic.c:547
 report_bug+0x208/0x249 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 fixup_bug arch/x86/kernel/traps.c:172 [inline]
 do_error_trap+0x195/0x2d0 arch/x86/kernel/traps.c:295
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:964
RIP: 0010:mutex_destroy.cold+0x13/0x1a kernel/locking/mutex-debug.c:103
RSP: 0018:ffff88805675fda8 EFLAGS: 00010286
RAX: 000000000000002a RBX: ffff8880a47e8a80 RCX: 0000000000000000
RDX: 00000000000002f8 RSI: ffffffff814a4600 RDI: ffffed100acebfab
RBP: ffff8880a47e8900 R08: 000000000000002a R09: 0000000000000000
R10: 0000000000000000 R11: ffff8880a4102100 R12: 0000000000000000
R13: ffff8880a47e8a80 R14: ffffffff8afd0ec0 R15: ffff888094ebd790
 ww_mutex_destroy include/linux/ww_mutex.h:347 [inline]
 reservation_object_fini include/linux/reservation.h:129 [inline]
 dma_buf_release+0x4be/0x5c0 drivers/dma-buf/dma-buf.c:77
 __fput+0x25f/0x7a0 fs/file_table.c:210
 task_work_run+0x11f/0x190 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
 do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x45e179
RSP: 002b:00007f42bccffc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: 0000000000000000 RBX: 000000000000c540 RCX: 000000000045e179
RDX: 0000000020000240 RSI: 00000000c00464b4 RDI: 0000000000000004
RBP: 000000000118d028 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cff4
R13: 00007ffc1f4e33ef R14: 00007f42bcd009c0 R15: 000000000118cff4
Kernel Offset: disabled
Rebooting in 86400 seconds..