INFO: task syz-executor.0:6781 blocked for more than 430 seconds.
      Tainted: G        W          6.2.0-rc1-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:0     pid:6781  ppid:2885   flags:0x00000004
Call Trace:
[<ffffffff834484b8>] context_switch kernel/sched/core.c:5244 [inline]
[<ffffffff834484b8>] __schedule+0x644/0x1274 kernel/sched/core.c:6555
[<ffffffff83449162>] schedule+0x7a/0x102 kernel/sched/core.c:6631
[<ffffffff828b07d8>] __lock_sock+0x126/0x204 net/core/sock.c:2904
[<ffffffff828b0972>] lock_sock_nested+0xbc/0xbe net/core/sock.c:3475
[<ffffffff83371f84>] __mptcp_close_ssk+0x10e/0x4c4 net/mptcp/protocol.c:2322
[<ffffffff83374bf8>] mptcp_destroy_common+0xda/0x2d0 net/mptcp/protocol.c:3152
[<ffffffff83374f1e>] mptcp_disconnect+0x8e/0x220 net/mptcp/protocol.c:3003
[<ffffffff82dbe1b2>] __inet_stream_connect+0x7de/0x842 net/ipv4/af_inet.c:717
[<ffffffff82d1748e>] tcp_sendmsg_fastopen+0x232/0x360 net/ipv4/tcp.c:1200
[<ffffffff83371c0a>] mptcp_sendmsg_fastopen net/mptcp/protocol.c:1676 [inline]
[<ffffffff83371c0a>] mptcp_sendmsg+0xc8c/0xef8 net/mptcp/protocol.c:1715
[<ffffffff82f2cbb8>] inet6_sendmsg+0x78/0x98 net/ipv6/af_inet6.c:660
[<ffffffff8289c116>] sock_sendmsg_nosec net/socket.c:714 [inline]
[<ffffffff8289c116>] sock_sendmsg+0xa0/0xc4 net/socket.c:734
[<ffffffff8289c69c>] ____sys_sendmsg+0x280/0x520 net/socket.c:2476
[<ffffffff828a3f7c>] ___sys_sendmsg+0x124/0x1b6 net/socket.c:2530
[<ffffffff828a447a>] __sys_sendmmsg+0x1cc/0x582 net/socket.c:2616
[<ffffffff828a4864>] __do_sys_sendmmsg net/socket.c:2645 [inline]
[<ffffffff828a4864>] sys_sendmmsg+0x34/0x44 net/socket.c:2642
[<ffffffff80005ff6>] ret_from_syscall+0x0/0x2

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
 #0: ffffffff8517bdd0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x34/0x6fe kernel/rcu/tasks.h:507
1 lock held by rcu_tasks_trace/13:
 #0: ffffffff8517bb30 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x34/0x6fe kernel/rcu/tasks.h:507
1 lock held by khungtaskd/29:
 #0: ffffffff8517b960 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x3c/0x20e kernel/locking/lockdep.c:6496
2 locks held by getty/2794:
 #0: ff60000013605098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3a/0x46 drivers/tty/tty_ldsem.c:340
 #1: ff2000000026b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xb9c/0xd0c drivers/tty/n_tty.c:2177
3 locks held by syz-executor.0/6781:
 #0: ff6000001a304930 (sk_lock-AF_INET6){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1725 [inline]
 #0: ff6000001a304930 (sk_lock-AF_INET6){+.+.}-{0:0}, at: mptcp_sendmsg+0xd2/0xef8 net/mptcp/protocol.c:1708
 #1: ff60000014d7c0f0 (k-sk_lock-AF_INET6){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1725 [inline]
 #1: ff60000014d7c0f0 (k-sk_lock-AF_INET6){+.+.}-{0:0}, at: mptcp_sendmsg_fastopen net/mptcp/protocol.c:1672 [inline]
 #1: ff60000014d7c0f0 (k-sk_lock-AF_INET6){+.+.}-{0:0}, at: mptcp_sendmsg+0xc26/0xef8 net/mptcp/protocol.c:1715
 #2: ff60000014d7c0f0 (k-sk_lock-AF_INET6/1){+.+.}-{0:0}, at: __mptcp_close_ssk+0x10e/0x4c4 net/mptcp/protocol.c:2322
1 lock held by syz-executor.1/7418:
1 lock held by syz-executor.0/7419:

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