------------[ cut here ]------------
atomic_read(&sk->sk_rmem_alloc)
WARNING: net/ipv4/af_inet.c:154 at inet_sock_destruct+0x603/0x740 net/ipv4/af_inet.c:154, CPU#0: syz.0.0/5315
Modules linked in:
CPU: 0 UID: 0 PID: 5315 Comm: syz.0.0 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+0x603/0x740 net/ipv4/af_inet.c:154
Code: 00 41 0f b6 74 24 12 48 c7 c7 e0 4b e8 8c 4c 89 e2 48 83 c4 20 5b 41 5c 41 5d 41 5e 41 5f 5d e9 f3 3d 01 f7 e8 0e 29 9f f7 90 <0f> 0b 90 e9 58 fe ff ff e8 00 29 9f f7 90 0f 0b 90 e9 8b fe ff ff
RSP: 0018:ffffc9000df26f20 EFLAGS: 00010283
RAX: ffffffff8a267c72 RBX: dffffc0000000000 RCX: 0000000000100000
RDX: ffffc9000ec4a000 RSI: 0000000000001b79 RDI: 0000000000001b7a
RBP: 00000000000003c4 R08: ffff88801f7be743 R09: 1ffff11003ef7ce8
R10: dffffc0000000000 R11: ffffed1003ef7ce9 R12: ffff88801f7be600
R13: dffffc0000000000 R14: ffff88801f7be740 R15: 1ffff11003ef7cc2
FS:  00007f8e458d46c0(0000) GS:ffff88808ca59000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8e44bec6b8 CR3: 000000001f7a4000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 __sk_destruct+0x85/0x880 net/core/sock.c:2350
 sock_put include/net/sock.h:2007 [inline]
 __mptcp_close_ssk+0x886/0x1180 net/mptcp/protocol.c:2587
 mptcp_pm_rm_addr_or_subflow+0x4ab/0x9d0 net/mptcp/pm.c:740
 mptcp_pm_nl_fullmesh net/mptcp/pm_kernel.c:1449 [inline]
 mptcp_pm_nl_set_flags_all net/mptcp/pm_kernel.c:1478 [inline]
 mptcp_pm_nl_set_flags+0x853/0xc90 net/mptcp/pm_kernel.c:1542
 mptcp_pm_set_flags net/mptcp/pm_netlink.c:277 [inline]
 mptcp_pm_nl_set_flags_doit+0x364/0x450 net/mptcp/pm_netlink.c:282
 genl_family_rcv_msg_doit+0x22a/0x330 net/netlink/genetlink.c:1114
 genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline]
 genl_rcv_msg+0x61c/0x7a0 net/netlink/genetlink.c:1209
 netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1218
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x80f/0x9b0 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg net/socket.c:742 [inline]
 ____sys_sendmsg+0xa68/0xad0 net/socket.c:2592
 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2646
 __sys_sendmsg net/socket.c:2678 [inline]
 __do_sys_sendmsg net/socket.c:2683 [inline]
 __se_sys_sendmsg net/socket.c:2681 [inline]
 __x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2681
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8e4499c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f8e458d3fe8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f8e44c15fa0 RCX: 00007f8e4499c799
RDX: 0000000000000008 RSI: 0000200000000100 RDI: 0000000000000007
RBP: 00007f8e44a32bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8e44c16038 R14: 00007f8e44c15fa0 R15: 00007ffe29592458
 </TASK>