rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
	(detected by 0, t=10502 jiffies, g=172701, q=6153)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4295083317-4295072815), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10502 jiffies! g172701 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:28696 pid:   14 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4955 [inline]
 __schedule+0x940/0x26f0 kernel/sched/core.c:6236
 schedule+0xd3/0x270 kernel/sched/core.c:6315
 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881
 rcu_gp_fqs_loop+0x186/0x810 kernel/rcu/tree.c:1959
 rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2132
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 417 Comm: syz-executor.3 Not tainted 5.15.0-rc3-next-20210927-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__lock_acquire+0xb6a/0x54a0 kernel/locking/lockdep.c:5011
Code: c7 c0 48 a0 6e 8d 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 90 45 00 00 8b 05 8a 73 13 0c 85 c0 0f 85 a3 00 00 00 8b 44 24 18 <85> c0 0f 85 83 08 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 54 24
RSP: 0018:ffffc90000dc0c58 EFLAGS: 00000046
RAX: 0000000000000002 RBX: 0000000000000040 RCX: ffffffff815b317a
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff888089328ad9
RBP: ffff888089328ada R08: 0000000000000000 R09: ffffffff8fd0d94f
R10: fffffbfff1fa1b29 R11: 0000000000000000 R12: ffff888089328ab8
R13: ffff888089328000 R14: 0000000000000001 R15: 89f049399db47ce3
FS:  00007f1f6ce37700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2ca26000 CR3: 00000000774f4000 CR4: 00000000003506e0
Call Trace:
 <IRQ>
 lock_acquire kernel/locking/lockdep.c:5625 [inline]
 lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5590
 seqcount_lockdep_reader_access include/linux/seqlock.h:103 [inline]
 timekeeping_get_delta kernel/time/timekeeping.c:252 [inline]
 timekeeping_get_ns kernel/time/timekeeping.c:386 [inline]
 ktime_get+0x147/0x470 kernel/time/timekeeping.c:829
 clockevents_program_event+0x141/0x370 kernel/time/clockevents.c:326
 tick_program_event+0xac/0x140 kernel/time/tick-oneshot.c:44
 hrtimer_interrupt+0x36e/0x790 kernel/time/hrtimer.c:1824
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103
 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:lock_acquire+0x1ef/0x510 kernel/locking/lockdep.c:5593
Code: ef a6 7e 83 f8 01 0f 85 b4 02 00 00 9c 58 f6 c4 02 0f 85 9f 02 00 00 48 83 7c 24 08 00 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24
RSP: 0018:ffffc9000b45f618 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: 1ffff9200168bec5 RCX: ffffffff815b378f
RDX: 1ffff1101126514c RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8fd0d9cf
R10: fffffbfff1fa1b39 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: ffff88806f43ef60 R15: 0000000000000000
 lock_sock_fast+0x36/0x100 net/core/sock.c:3229
 mptcp_subflow_cleanup_rbuf net/mptcp/protocol.c:465 [inline]
 mptcp_cleanup_rbuf net/mptcp/protocol.c:499 [inline]
 mptcp_recvmsg+0xad3/0x27b0 net/mptcp/protocol.c:2069
 inet6_recvmsg+0x11b/0x5e0 net/ipv6/af_inet6.c:659
 sock_recvmsg_nosec net/socket.c:944 [inline]
 ____sys_recvmsg+0x527/0x600 net/socket.c:2626
 ___sys_recvmsg+0x127/0x200 net/socket.c:2670
 do_recvmmsg+0x24d/0x6d0 net/socket.c:2764
 __sys_recvmmsg net/socket.c:2843 [inline]
 __do_sys_recvmmsg net/socket.c:2866 [inline]
 __se_sys_recvmmsg net/socket.c:2859 [inline]
 __x64_sys_recvmmsg+0x20b/0x260 net/socket.c:2859
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f1f6f8c0709
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1f6ce37188 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007f1f6f9c4f60 RCX: 00007f1f6f8c0709
RDX: 0000000000000002 RSI: 00000000200017c0 RDI: 0000000000000004
RBP: 00007f1f6f91acb4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe5b05c9ff R14: 00007f1f6ce37300 R15: 0000000000022000
 </TASK>
----------------
Code disassembly (best guess):
   0:	c7 c0 48 a0 6e 8d    	mov    $0x8d6ea048,%eax
   6:	83 e0 07             	and    $0x7,%eax
   9:	83 c0 03             	add    $0x3,%eax
   c:	38 d0                	cmp    %dl,%al
   e:	7c 08                	jl     0x18
  10:	84 d2                	test   %dl,%dl
  12:	0f 85 90 45 00 00    	jne    0x45a8
  18:	8b 05 8a 73 13 0c    	mov    0xc13738a(%rip),%eax        # 0xc1373a8
  1e:	85 c0                	test   %eax,%eax
  20:	0f 85 a3 00 00 00    	jne    0xc9
  26:	8b 44 24 18          	mov    0x18(%rsp),%eax
* 2a:	85 c0                	test   %eax,%eax <-- trapping instruction
  2c:	0f 85 83 08 00 00    	jne    0x8b5
  32:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  39:	fc ff df
  3c:	48                   	rex.W
  3d:	8b                   	.byte 0x8b
  3e:	54                   	push   %rsp
  3f:	24                   	.byte 0x24