INFO: task syz-executor.4:8800 can't die for more than 143 seconds.
task:syz-executor.4  state:R  running task     stack:26544 pid: 8800 ppid:  6889 flags:0x00004006
Call Trace:
 context_switch kernel/sched/core.c:3777 [inline]
 __schedule+0xec5/0x2200 kernel/sched/core.c:4526
 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:4685
 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:40
 __local_bh_enable_ip+0x1a0/0x1f0 kernel/softirq.c:202
 __mptcp_move_skbs+0x216/0x510 net/mptcp/protocol.c:1466
 mptcp_recvmsg+0x1015/0x1880 net/mptcp/protocol.c:1507
 inet6_recvmsg+0x11b/0x5d0 net/ipv6/af_inet6.c:654
 sock_recvmsg_nosec net/socket.c:885 [inline]
 sock_recvmsg net/socket.c:903 [inline]
 sock_recvmsg net/socket.c:899 [inline]
 ____sys_recvmsg+0x2c4/0x640 net/socket.c:2585
 ___sys_recvmsg+0x127/0x200 net/socket.c:2627
 do_recvmmsg+0x252/0x700 net/socket.c:2727
 __sys_recvmmsg net/socket.c:2806 [inline]
 __do_sys_recvmmsg net/socket.c:2829 [inline]
 __se_sys_recvmmsg net/socket.c:2822 [inline]
 __x64_sys_recvmmsg+0x20b/0x260 net/socket.c:2822
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45e179
Code: Bad RIP value.
RSP: 002b:00007f190ef2bc78 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 0000000000027000 RCX: 000000000045e179
RDX: 0000000000000002 RSI: 0000000020004280 RDI: 0000000000000003
RBP: 000000000118cf90 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000246 R12: 000000000118cf4c
R13: 00007ffeffe732af R14: 00007f190ef2c9c0 R15: 000000000118cf4c

Showing all locks held in the system:
1 lock held by khungtaskd/1183:
 #0: ffffffff8a553d40 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6221
1 lock held by in:imklog/6767:
 #0: ffff8880992e5370 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:930
1 lock held by syz-executor.4/8800:

=============================================