------------[ cut here ]------------
refcount_t: increment on 0; use-after-free.
WARNING: CPU: 0 PID: 5699 at lib/refcount.c:153 refcount_inc_checked lib/refcount.c:153 [inline]
WARNING: CPU: 0 PID: 5699 at lib/refcount.c:153 refcount_inc_checked+0x61/0x70 lib/refcount.c:151
Kernel panic - not syncing: panic_on_warn set ...
kobject: 'loop3' (00000000c28ccefc): kobject_uevent_env
CPU: 0 PID: 5699 Comm: syz-executor1 Not tainted 5.0.0-rc4+ #52
kobject: 'loop3' (00000000c28ccefc): fill_kobj_path: path = '/devices/virtual/block/loop3'
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+0x1db/0x2d0 lib/dump_stack.c:113
 panic+0x2cb/0x65c kernel/panic.c:214
IPVS: ftp: loaded support on port[0] = 21
kobject: 'lo' (0000000072581ec8): kobject_add_internal: parent: 'net', set: 'devices'
 __warn.cold+0x20/0x48 kernel/panic.c:571
 report_bug+0x263/0x2b0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 fixup_bug arch/x86/kernel/traps.c:173 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271
kobject: 'lo' (0000000072581ec8): kobject_uevent_env
 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:290
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973
RIP: 0010:refcount_inc_checked lib/refcount.c:153 [inline]
RIP: 0010:refcount_inc_checked+0x61/0x70 lib/refcount.c:151
Code: 1d b1 66 c8 06 31 ff 89 de e8 4b 1f f2 fd 84 db 75 dd e8 02 1e f2 fd 48 c7 c7 60 9f 81 88 c6 05 91 66 c8 06 01 e8 0f 69 bb fd <0f> 0b eb c1 90 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 54 49
RSP: 0018:ffff888056c2f8a0 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc90008201000
RDX: 00000000000109c1 RSI: ffffffff81685776 RDI: 0000000000000005
RBP: ffff888056c2f8b0 R08: ffff8880981ee180 R09: ffffed1015cc5021
R10: ffffed1015cc5020 R11: ffff8880ae628107 R12: ffffc9000193c6b8
kobject: 'lo' (0000000072581ec8): fill_kobj_path: path = '/devices/virtual/net/lo'
R13: ffff8880a48f5f00 R14: ffffffff898bdf60 R15: ffffc90001933000
 kvm_get_kvm arch/x86/kvm/../../../virt/kvm/kvm_main.c:762 [inline]
 kvm_ioctl_create_device arch/x86/kvm/../../../virt/kvm/kvm_main.c:3012 [inline]
 kvm_vm_ioctl+0x117f/0x1fe0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3250
kobject: 'queues' (00000000e8d705ca): kobject_add_internal: parent: 'lo', set: '<NULL>'
kobject: 'queues' (00000000e8d705ca): kobject_uevent_env
kobject: 'queues' (00000000e8d705ca): kobject_uevent_env: filter function caused the event to drop!
 kvm_vm_compat_ioctl+0x13c/0x420 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3306
kobject: 'rx-0' (0000000058247817): kobject_add_internal: parent: 'queues', set: 'queues'
 __do_compat_sys_ioctl fs/compat_ioctl.c:1052 [inline]
 __se_compat_sys_ioctl fs/compat_ioctl.c:998 [inline]
 __ia32_compat_sys_ioctl+0x197/0x620 fs/compat_ioctl.c:998
 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline]
 do_fast_syscall_32+0x333/0xf98 arch/x86/entry/common.c:397
kobject: 'rx-0' (0000000058247817): kobject_uevent_env
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7f9c869
Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 14 24 c3 8b 3c 24 c3 90 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
kobject: 'rx-0' (0000000058247817): fill_kobj_path: path = '/devices/virtual/net/lo/queues/rx-0'
RSP: 002b:00000000f5d770cc EFLAGS: 00000296 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 00000000c00caee0
RDX: 0000000020000340 RSI: 0000000000000000 RDI: 0000000000000000
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..