------------[ cut here ]------------
sk->sk_forward_alloc
WARNING: net/ipv4/af_inet.c:162 at inet_sock_destruct+0x62d/0x740, CPU#0: syz.2.8454/25261
Modules linked in:
CPU: 0 UID: 0 PID: 25261 Comm: syz.2.8454 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
RIP: 0010:inet_sock_destruct+0x62d/0x740
Code: 0f 0b 90 e9 58 fe ff ff e8 20 7c 9e f7 90 0f 0b 90 e9 8b fe ff ff e8 12 7c 9e f7 90 0f 0b 90 e9 b1 fe ff ff e8 04 7c 9e 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:ffffc90000007d20 EFLAGS: 00010246
RAX: ffffffff8a27484c RBX: dffffc0000000000 RCX: ffff88810c410000
RDX: 0000000000000100 RSI: 0000000000000090 RDI: 0000000000000000
RBP: 0000000000000090 R08: ffff8881725546a7 R09: 1ffff1102e4aa8d4
R10: dffffc0000000000 R11: ffffed102e4aa8d5 R12: ffff888172554400
R13: ffff888172554908 R14: ffff88817255468c R15: ffffffff8fea7c80
FS:  00007f2f06fe16c0(0000) GS:ffff88818dc95000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2f0640e490 CR3: 000000010d36e000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 __sk_destruct+0x8d/0x9d0
 rcu_core+0x7cd/0x1070
 handle_softirqs+0x22a/0x840
 __irq_exit_rcu+0xca/0x220
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:lock_acquire+0x74/0x350
Code: 83 01 00 00 89 c0 48 0f a3 05 a8 78 8e 0e 73 0d e8 91 28 09 00 84 c0 0f 84 ca 01 00 00 83 3d 82 ab 8e 0e 00 0f 84 d3 00 00 00 <48> 8b b4 24 90 00 00 00 4c 89 ef e8 3c e9 90 00 83 3d 65 ab 8e 0e
RSP: 0018:ffffc90004d77278 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000080000003
RDX: 0000000000000000 RSI: ffffffff8c28c0c0 RDI: ffffffff8c28c080
RBP: ffffffff823e5d6a R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff940008f5211 R12: 0000000000000002
R13: ffffffff8e95cda0 R14: 0000000000000000 R15: 0000000000000000
 pfn_valid+0xd6/0x480
 page_table_check_clear+0x21/0x4f0
 __zap_vma_range+0x3650/0x4b50
 unmap_vmas+0x379/0x530
 exit_mmap+0x280/0x9e0
 __mmput+0x118/0x430
 exit_mm+0x1f6/0x2d0
 do_exit+0x6a2/0x22c0
 do_group_exit+0x21b/0x2d0
 get_signal+0x1284/0x1330
 arch_do_signal_or_restart+0xbc/0x840
 exit_to_user_mode_loop+0xa9/0x680
 do_syscall_64+0x353/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2f0619ce59
Code: Unable to access opcode bytes at 0x7f2f0619ce2f.
RSP: 002b:00007f2f06fe10e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00007f2f06415fa8 RCX: 00007f2f0619ce59
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f2f06415fac
RBP: 00007f2f06415fa0 R08: 3fffffffffffffff R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2f06416038 R14: 00007ffe7d68d430 R15: 00007ffe7d68d518
 </TASK>
