------------[ cut here ]------------
WARNING: CPU: 0 PID: 7 at net/ipv4/af_inet.c:156 inet_sock_destruct+0x674/0x830 net/ipv4/af_inet.c:156
Modules linked in:
CPU: 0 PID: 7 Comm: kworker/0:1 Not tainted 5.10.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events mptcp_worker

RIP: 0010:inet_sock_destruct+0x674/0x830 net/ipv4/af_inet.c:156
Code: 4c 89 e7 e8 1e a8 6c ff e9 09 fd ff ff e8 74 c0 f0 f9 0f 0b e9 43 fe ff ff e8 68 c0 f0 f9 0f 0b e9 94 fe ff ff e8 5c c0 f0 f9 <0f> 0b e9 cf fe ff ff e8 50 c0 f0 f9 0f 0b e9 0a ff ff ff e8 84 c8
RSP: 0018:ffffc90000cc7a30 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000013284 RCX: ffffffff877f6e62
RDX: ffff888010d23480 RSI: ffffffff877f6f94 RDI: 0000000000000005
RBP: ffff8880203ae46c R08: 0000000000000000 R09: ffff8880203ae46f
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880203ae200
R13: ffff8880203ae350 R14: 0000000000000003 R15: ffff8880203ae638
FS:  0000000000000000(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000180 CR3: 0000000010f54000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __sk_destruct+0x4b/0x8f0 net/core/sock.c:1759
 sk_destruct+0xbd/0xe0 net/core/sock.c:1803
 __sk_free+0xef/0x3d0 net/core/sock.c:1814
 sk_free+0x78/0xa0 net/core/sock.c:1825
 sock_put include/net/sock.h:1783 [inline]
 __mptcp_close_ssk+0x36a/0x460 net/mptcp/protocol.c:1787
 __mptcp_destroy_sock+0x407/0x7b0 net/mptcp/protocol.c:2146
 mptcp_worker+0xb60/0x1a10 net/mptcp/protocol.c:1896
 process_one_work+0x933/0x15a0 kernel/workqueue.c:2272
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2418
 kthread+0x3af/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296