------------[ 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: udevd/5336
Modules linked in:
CPU: 3 UID: 0 PID: 5336 Comm: udevd 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:163
Code: e3 4e ff e9 06 fd ff ff e8 ba 62 ff f7 90 0f 0b 90 e9 35 fe ff ff e8 ac 62 ff f7 90 0f 0b 90 e9 c5 fe ff ff e8 9e 62 ff f7 90 <0f> 0b 90 e9 04 ff ff ff e8 90 62 ff f7 90 0f 0b 90 e9 65 fe ff ff
RSP: 0018:ffffc900006f8d98 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888058b1f700 RCX: ffffffff8a099427
RDX: ffff88802df48000 RSI: ffffffff8a099522 RDI: ffff88802df48000
RBP: 0000000000000090 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000090 R11: 0000000000000000 R12: ffff888058b1f700
R13: ffff888058b1f790 R14: ffffffff81eebbdd R15: 0000000000000003
FS:  00007f32e99e5880(0000) GS:ffff8880d663e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000034a78000 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:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:194
Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 16 5d 51 f6 48 89 df e8 fe ac 51 f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 <bf> 01 00 00 00 e8 b5 cd 41 f6 65 8b 05 5e 6e 7a 08 85 c0 74 16 5b
RSP: 0018:ffffc900037bf478 EFLAGS: 00000246
RAX: 0000000000000002 RBX: ffffffff9b48bc00 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8de7920a RDI: ffffffff8c1b14a0
RBP: 0000000000000206 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000001
R13: dffffc0000000000 R14: ffff88801fcb3888 R15: 1ffff920006f7e96
 debug_object_active_state+0x2ea/0x3f0 lib/debugobjects.c:1072
 debug_rcu_head_queue kernel/rcu/rcu.h:237 [inline]
 __call_rcu_common.constprop.0+0x4e/0x9b0 kernel/rcu/tree.c:3116
 destroy_inode+0x134/0x1c0 fs/inode.c:402
 evict+0x599/0xad0 fs/inode.c:870
 iput_final fs/inode.c:1966 [inline]
 iput.part.0+0x605/0xf50 fs/inode.c:2015
 iput+0x35/0x40 fs/inode.c:1981
 dentry_unlink_inode+0x2a1/0x490 fs/dcache.c:467
 __dentry_kill+0x1d0/0x600 fs/dcache.c:670
 shrink_kill fs/dcache.c:1147 [inline]
 shrink_dentry_list+0x180/0x5e0 fs/dcache.c:1174
 shrink_dcache_tree+0x100/0x570 fs/dcache.c:1620
 shrink_dcache_parent fs/dcache.c:1626 [inline]
 d_invalidate fs/dcache.c:1708 [inline]
 d_invalidate+0x13a/0x290 fs/dcache.c:1693
 lookup_fast+0x3f4/0x600 fs/namei.c:1881
 walk_component fs/namei.c:2275 [inline]
 link_path_walk+0x7d4/0x1cc0 fs/namei.c:2647
 path_openat+0x1be/0x31a0 fs/namei.c:4826
 do_file_open+0x20e/0x430 fs/namei.c:4859
 do_sys_openat2+0x10d/0x1e0 fs/open.c:1366
 do_sys_open fs/open.c:1372 [inline]
 __do_sys_openat fs/open.c:1388 [inline]
 __se_sys_openat fs/open.c:1383 [inline]
 __x64_sys_openat+0x12d/0x210 fs/open.c:1383
 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: 0033:0x7f32e92a7407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007fff5ce370e0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f32e99e5880 RCX: 00007f32e92a7407
RDX: 0000000000080000 RSI: 00007fff5ce37260 RDI: ffffffffffffff9c
RBP: 0000000000000008 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 00005617333577f5
R13: 00005617333577f5 R14: 0000000000000001 R15: 0000000000000000
 </TASK>
----------------
Code disassembly (best guess):
   0:	f5                   	cmc
   1:	53                   	push   %rbx
   2:	48 8b 74 24 10       	mov    0x10(%rsp),%rsi
   7:	48 89 fb             	mov    %rdi,%rbx
   a:	48 83 c7 18          	add    $0x18,%rdi
   e:	e8 16 5d 51 f6       	call   0xf6515d29
  13:	48 89 df             	mov    %rbx,%rdi
  16:	e8 fe ac 51 f6       	call   0xf651ad19
  1b:	f7 c5 00 02 00 00    	test   $0x200,%ebp
  21:	75 23                	jne    0x46
  23:	9c                   	pushf
  24:	58                   	pop    %rax
  25:	f6 c4 02             	test   $0x2,%ah
  28:	75 37                	jne    0x61
* 2a:	bf 01 00 00 00       	mov    $0x1,%edi <-- trapping instruction
  2f:	e8 b5 cd 41 f6       	call   0xf641cde9
  34:	65 8b 05 5e 6e 7a 08 	mov    %gs:0x87a6e5e(%rip),%eax        # 0x87a6e99
  3b:	85 c0                	test   %eax,%eax
  3d:	74 16                	je     0x55
  3f:	5b                   	pop    %rbx