------------[ cut here ]------------
sk->sk_forward_alloc
WARNING: net/ipv4/af_inet.c:162 at inet_sock_destruct+0x653/0x800 net/ipv4/af_inet.c:162, 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:162
Code: 32 4d ff e9 06 fd ff ff e8 fa 73 fc f7 90 0f 0b 90 e9 35 fe ff ff e8 ec 73 fc f7 90 0f 0b 90 e9 c5 fe ff ff e8 de 73 fc f7 90 <0f> 0b 90 e9 04 ff ff ff e8 d0 73 fc f7 90 0f 0b 90 e9 65 fe ff ff
RSP: 0018:ffffc900006f8d90 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88803c9c9100 RCX: ffffffff8a0cd007
RDX: ffff88801ee9a540 RSI: ffffffff8a0cd102 RDI: ffff88801ee9a540
RBP: 0000000000000f70 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000f70 R11: 000000000000a987 R12: ffff88803c9c9100
R13: ffff88803c9c9190 R14: ffffffff81ee981d R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8880d665f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe6b93ea540 CR3: 0000000034201000 CR4: 0000000000352ef0
Call Trace:
 <IRQ>
 __sk_destruct+0x85/0xab0 net/core/sock.c:2357
 rcu_do_batch kernel/rcu/tree.c:2645 [inline]
 rcu_core+0x5a2/0x10d0 kernel/rcu/tree.c:2897
 handle_softirqs+0x1ea/0x9b0 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0x162/0x210 kernel/softirq.c:735
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:752
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0xa3/0xc0 arch/x86/kernel/apic/apic.c:1062
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:64
Code: c6 90 02 e9 c3 48 03 00 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 83 e6 1e 00 fb f4 <c3> cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0018:ffffc90000197e00 EFLAGS: 00000246
RAX: 000000000002c1ac RBX: ffff88801ee9a540 RCX: ffffffff8b8cb2b5
RDX: 0000000000000001 RSI: ffffffff8c1ce980 RDI: ffffffff81de1ea7
RBP: ffffed1003dd34a8 R08: 0000000000000000 R09: ffffed100d4e678d
R10: ffff88806a733c6b R11: ffffffff81d4f52c R12: 0000000000000000
R13: 0000000000000000 R14: 1ffff92000032fc4 R15: dffffc0000000000
 arch_safe_halt arch/x86/include/asm/paravirt.h:62 [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+0x3a7/0x5b0 kernel/sched/idle.c:355
 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:454
 start_secondary+0x21d/0x2d0 arch/x86/kernel/smpboot.c:312
 common_startup_64+0x13e/0x158
 </TASK>
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	90                   	nop
   1:	02 e9                	add    %cl,%ch
   3:	c3                   	ret
   4:	48 03 00             	add    (%rax),%rax
   7:	0f 1f 00             	nopl   (%rax)
   a:	90                   	nop
   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:	f3 0f 1e fa          	endbr64
  1e:	eb 07                	jmp    0x27
  20:	0f 00 2d 83 e6 1e 00 	verw   0x1ee683(%rip)        # 0x1ee6aa
  27:	fb                   	sti
  28:	f4                   	hlt
* 29:	c3                   	ret <-- trapping instruction
  2a:	cc                   	int3
  2b:	cc                   	int3
  2c:	cc                   	int3
  2d:	cc                   	int3
  2e:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
  35:	00 00 00
  38:	66 90                	xchg   %ax,%ax
  3a:	90                   	nop
  3b:	90                   	nop
  3c:	90                   	nop
  3d:	90                   	nop
  3e:	90                   	nop