------------[ cut here ]------------
sk->sk_forward_alloc
WARNING: net/ipv4/af_inet.c:157 at inet_sock_destruct+0x62d/0x740, CPU#0: kworker/0:4/5873
Modules linked in:
CPU: 0 UID: 0 PID: 5873 Comm: kworker/0:4 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: mld mld_ifc_work
RIP: 0010:inet_sock_destruct+0x62d/0x740
Code: 0f 0b 90 e9 58 fe ff ff e8 40 3a a1 f7 90 0f 0b 90 e9 8b fe ff ff e8 32 3a a1 f7 90 0f 0b 90 e9 b1 fe ff ff e8 24 3a a1 f7 90 <0f> 0b 90 e9 d7 fe ff ff 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 95 fc
RSP: 0018:ffffc90000007d48 EFLAGS: 00010246
RAX: ffffffff8a24532c RBX: dffffc0000000000 RCX: ffff888109d05700
RDX: 0000000000000100 RSI: 0000000000000090 RDI: 0000000000000000
RBP: 0000000000000090 R08: ffff8881ac6e4f27 R09: 1ffff110358dc9e4
R10: dffffc0000000000 R11: ffffed10358dc9e5 R12: ffff8881ac6e4c80
R13: dffffc0000000000 R14: ffff8881ac6e4f0c R15: ffffffff8fca9480
FS:  0000000000000000(0000) GS:ffff88818de67000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555566595000 CR3: 000000019cd8a000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 __sk_destruct+0x85/0x880
 rcu_core+0x7cd/0x1070
 handle_softirqs+0x22a/0x870
 do_softirq+0x76/0xd0
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0xf8/0x130
 __alloc_skb+0x1aa/0x7d0
 mld_newpack+0x14c/0xc90
 add_grec+0xaee/0x1740
 mld_ifc_work+0x1d0/0xe70
 process_scheduled_works+0xb02/0x1830
 worker_thread+0xa50/0xfc0
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 ret_from_fork_asm+0x1a/0x30
 </TASK>
