------------[ cut here ]------------
sk->sk_forward_alloc
WARNING: net/ipv4/af_inet.c:163 at inet_sock_destruct+0x653/0x800 net/ipv4/af_inet.c:163, CPU#3: swapper/3/0
Modules linked in:
CPU: 3 UID: 0 PID: 0 Comm: swapper/3 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:inet_sock_destruct+0x653/0x800 net/ipv4/af_inet.c:163
Code: f1 4e ff e9 06 fd ff ff e8 7a 81 ff f7 90 0f 0b 90 e9 35 fe ff ff e8 6c 81 ff f7 90 0f 0b 90 e9 c5 fe ff ff e8 5e 81 ff f7 90 <0f> 0b 90 e9 04 ff ff ff e8 50 81 ff f7 90 0f 0b 90 e9 65 fe ff ff
RSP: 0018:ffffc900006f8d98 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88803968f700 RCX: ffffffff8a095ee7
RDX: ffff88801eafa4c0 RSI: ffffffff8a095fe2 RDI: ffff88801eafa4c0
RBP: 0000000000000f70 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000f70 R11: 000000000000aa13 R12: ffff88803968f700
R13: ffff88803968f790 R14: ffffffff81eea6fd R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8880d663f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007faf44981f20 CR3: 000000002d2b0000 CR4: 0000000000352ef0
Call Trace:
 <IRQ>
 __sk_destruct+0x85/0xbb0 net/core/sock.c:2350
 rcu_do_batch kernel/rcu/tree.c:2617 [inline]
 rcu_core+0x5a2/0x10d0 kernel/rcu/tree.c:2869
 handle_softirqs+0x1eb/0x9e0 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xef/0x150 kernel/softirq.c:723
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0xa3/0xc0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:63
Code: 28 82 02 c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa eb 07 0f 00 2d a3 f1 1a 00 fb f4 <e9> fc 35 03 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0018:ffffc90000197df0 EFLAGS: 00000202
RAX: 00000000001158fd RBX: ffff88801eafa4c0 RCX: ffffffff8b909c75
RDX: 0000000000000000 RSI: ffffffff8de788ab RDI: ffffffff8c1b1220
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed100d4e679d
R10: ffff88806a733ceb R11: 0000000000000000 R12: 0000000000000003
R13: ffffed1003d5f498 R14: 0000000000000003 R15: ffffffff90d9ae10
 arch_safe_halt arch/x86/include/asm/paravirt.h:73 [inline]
 default_idle+0x9/0x10 arch/x86/kernel/process.c:767
 default_idle_call+0x6c/0xb0 kernel/sched/idle.c:122
 cpuidle_idle_call kernel/sched/idle.c:199 [inline]
 do_idle+0x464/0x590 kernel/sched/idle.c:352
 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:451
 start_secondary+0x21d/0x2d0 arch/x86/kernel/smpboot.c:312
 common_startup_64+0x13e/0x148
 </TASK>
----------------
Code disassembly (best guess):
   0:	28 82 02 c3 cc cc    	sub    %al,-0x33333cfe(%rdx)
   6:	cc                   	int3
   7:	cc                   	int3
   8:	0f 1f 00             	nopl   (%rax)
   b:	90                   	nop
   c:	90                   	nop
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	90                   	nop
  19:	90                   	nop
  1a:	90                   	nop
  1b:	f3 0f 1e fa          	endbr64
  1f:	eb 07                	jmp    0x28
  21:	0f 00 2d a3 f1 1a 00 	verw   0x1af1a3(%rip)        # 0x1af1cb
  28:	fb                   	sti
  29:	f4                   	hlt
* 2a:	e9 fc 35 03 00       	jmp    0x3362b <-- trapping instruction
  2f:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
  36:	00 00 00
  39:	66 90                	xchg   %ax,%ax
  3b:	90                   	nop
  3c:	90                   	nop
  3d:	90                   	nop
  3e:	90                   	nop
  3f:	90                   	nop