------------[ cut here ]------------
WARNING: CPU: 1 PID: 20 at net/ipv4/af_inet.c:152 inet_sock_destruct+0x633/0x7f0 net/ipv4/af_inet.c:152
Modules linked in:
CPU: 1 PID: 20 Comm: kworker/1:0 Not tainted 5.15.0-rc4-next-20211007-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+0x633/0x7f0 net/ipv4/af_inet.c:152
Code: e9 42 81 b0 f9 e8 3d 81 b0 f9 89 ee 4c 89 e7 e8 93 de 64 ff e9 13 fd ff ff e8 29 81 b0 f9 0f 0b e9 4d fe ff ff e8 1d 81 b0 f9 <0f> 0b e9 e5 fe ff ff e8 11 81 b0 f9 0f 0b e9 20 ff ff ff e8 05 81
RSP: 0018:ffffc90000da7a70 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 00000000000a65e0 RCX: 0000000000000000
RDX: ffff8880119b0000 RSI: ffffffff87c5fb23 RDI: 0000000000000003
RBP: ffff88806350dbac R08: 0000000000000000 R09: ffff88806350dbaf
R10: ffffffff87c5fa07 R11: 0000000000000000 R12: ffff88806350d940
R13: ffff88806350da90 R14: 0000000000000003 R15: ffffc90000da7bd0
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000184 CR3: 00000000790bb000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __sk_destruct+0x4b/0x900 net/core/sock.c:1999
 sk_destruct+0xbd/0xe0 net/core/sock.c:2044
 __sk_free+0xef/0x3d0 net/core/sock.c:2055
 sk_free+0x78/0xa0 net/core/sock.c:2066
 sock_put include/net/sock.h:1870 [inline]
 __mptcp_close_ssk+0x435/0x590 net/mptcp/protocol.c:2317
 __mptcp_destroy_sock+0x35f/0x830 net/mptcp/protocol.c:2744
 mptcp_worker+0x7aa/0xc20 net/mptcp/protocol.c:2510
 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2297
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>