------------[ cut here ]------------
sk->sk_forward_alloc
WARNING: net/ipv4/af_inet.c:157 at inet_sock_destruct+0x653/0x800 net/ipv4/af_inet.c:157, CPU#1: syz-executor/13661
Modules linked in:
CPU: 1 UID: 0 PID: 13661 Comm: syz-executor Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
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:157
Code: fc 4e ff e9 06 fd ff ff e8 3a 5b 0b f8 90 0f 0b 90 e9 35 fe ff ff e8 2c 5b 0b f8 90 0f 0b 90 e9 c5 fe ff ff e8 1e 5b 0b f8 90 <0f> 0b 90 e9 04 ff ff ff e8 10 5b 0b f8 90 0f 0b 90 e9 65 fe ff ff
RSP: 0018:ffffc900006a0d98 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888026dd7700 RCX: ffffffff89fbb767
RDX: ffff888035a04900 RSI: ffffffff89fbb862 RDI: ffff888035a04900
RBP: 0000000000000f70 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000f70 R11: 0000000000000000 R12: ffff888026dd7700
R13: ffff888026dd7790 R14: ffffffff81ed0bad R15: 0000000000000000
FS:  00005555584dc500(0000) GS:ffff8880d648b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa5a73e42f8 CR3: 0000000059595000 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+0x1ea/0x910 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:rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline]
RIP: 0010:rcu_is_watching+0xd/0xc0 kernel/rcu/tree.c:752
Code: 81 e8 f7 ed 86 00 e9 49 ff ff ff 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 53 65 ff 05 c3 83 1d 12 <e8> 6e e8 94 09 48 c7 c3 a8 8a 0a 94 89 c5 83 f8 07 0f 87 82 00 00
RSP: 0018:ffffc90006a6f9c0 EFLAGS: 00000283
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff906c5588
RBP: ffffffff906c5588 R08: 0000000000000001 R09: 0000000000000000
R10: ffffc90006a6fbf0 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000
 trace_lock_acquire include/trace/events/lock.h:24 [inline]
 lock_acquire+0x2c4/0x330 kernel/locking/lockdep.c:5831
 __mutex_lock_common kernel/locking/mutex.c:614 [inline]
 __mutex_lock+0x1a2/0x1b90 kernel/locking/mutex.c:776
 nf_sockopt_find.isra.0+0x2a/0x290 net/netfilter/nf_sockopt.c:67
 nf_getsockopt+0x2d/0xe0 net/netfilter/nf_sockopt.c:113
 ipv6_getsockopt+0x207/0x2a0 net/ipv6/ipv6_sockglue.c:1473
 tcp_getsockopt+0xa1/0x110 net/ipv4/tcp.c:4893
 do_sock_getsockopt+0x259/0x3d0 net/socket.c:2383
 __sys_getsockopt+0x148/0x260 net/socket.c:2412
 __do_sys_getsockopt net/socket.c:2419 [inline]
 __se_sys_getsockopt net/socket.c:2416 [inline]
 __x64_sys_getsockopt+0xbd/0x160 net/socket.c:2416
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa5a719d76a
Code: 48 83 ec 10 89 d2 48 63 ff 45 31 c9 6a 2a 45 31 c0 31 c9 e8 58 9a fb ff 48 83 c4 18 c3 0f 1f 00 49 89 ca b8 37 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 06 c3 0f 1f 44 00 00 48 c7 c2 e8 ff ff ff f7
RSP: 002b:00007ffdcb714eb8 EFLAGS: 00000212 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 00007ffdcb714f40 RCX: 00007fa5a719d76a
RDX: 0000000000000041 RSI: 0000000000000029 RDI: 0000000000000003
RBP: 0000000000000003 R08: 00007ffdcb714edc R09: 0000000000000000
R10: 00007ffdcb714f40 R11: 0000000000000212 R12: 00007fa5a73e77a0
R13: 00007ffdcb714edc R14: 0000000000000000 R15: 00007fa5a73e7e60
 </TASK>
----------------
Code disassembly (best guess):
   0:	81 e8 f7 ed 86 00    	sub    $0x86edf7,%eax
   6:	e9 49 ff ff ff       	jmp    0xffffff54
   b:	66 90                	xchg   %ax,%ax
   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:	90                   	nop
  1c:	90                   	nop
  1d:	f3 0f 1e fa          	endbr64
  21:	55                   	push   %rbp
  22:	53                   	push   %rbx
  23:	65 ff 05 c3 83 1d 12 	incl   %gs:0x121d83c3(%rip)        # 0x121d83ed
* 2a:	e8 6e e8 94 09       	call   0x994e89d <-- trapping instruction
  2f:	48 c7 c3 a8 8a 0a 94 	mov    $0xffffffff940a8aa8,%rbx
  36:	89 c5                	mov    %eax,%ebp
  38:	83 f8 07             	cmp    $0x7,%eax
  3b:	0f                   	.byte 0xf
  3c:	87                   	.byte 0x87
  3d:	82                   	(bad)