rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (10499 ticks this GP) idle=08b/1/0x4000000000000000 softirq=49971/49971 fqs=35 
	(t=10500 jiffies g=93509 q=310)
rcu: rcu_preempt kthread starved for 10422 jiffies! g93509 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
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:1966
 rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2139
 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 28828 Comm: syz-executor.4 Not tainted 5.15.0-rc3-next-20211001-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:debug_lockdep_rcu_enabled+0x2b/0x30 kernel/rcu/update.c:282
Code: 05 3a 64 3b 04 85 c0 74 21 8b 05 4c 97 3b 04 85 c0 74 17 65 48 8b 04 25 40 70 02 00 8b 80 64 0a 00 00 85 c0 0f 94 c0 0f b6 c0 <c3> cc cc cc cc 41 54 55 48 c7 c5 08 aa 03 00 53 89 fb e8 ae 0c 00
RSP: 0018:ffffc90000007df8 EFLAGS: 00000046
RAX: 0000000000000001 RBX: ffff8880b9c2a440 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffffffff8165eeeb RDI: 0000000000000003
RBP: ffff888083a8b600 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff8165ecec R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000000 R14: ffff8880b9c2a3c0 R15: 0000000000000001
FS:  00007f3d9c43e700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f729000 CR3: 00000000764d5000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 rcu_read_lock_held_common kernel/rcu/update.c:104 [inline]
 rcu_read_lock_sched_held+0xd/0x70 kernel/rcu/update.c:123
 trace_hrtimer_start include/trace/events/timer.h:195 [inline]
 debug_activate kernel/time/hrtimer.c:476 [inline]
 enqueue_hrtimer+0x2bd/0x3e0 kernel/time/hrtimer.c:1084
 __run_hrtimer kernel/time/hrtimer.c:1702 [inline]
 __hrtimer_run_queues+0xb02/0xe50 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
 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:__sanitizer_cov_trace_const_cmp1+0x18/0x80 kernel/kcov.c:274
Code: 4c 38 f0 4e 89 54 c8 20 48 89 10 c3 66 0f 1f 44 00 00 53 41 89 fb 41 89 f1 bf 03 00 00 00 65 48 8b 0c 25 40 70 02 00 48 89 ce <4c> 8b 54 24 08 e8 3e f8 ff ff 84 c0 74 51 48 8b 81 90 15 00 00 44
RSP: 0018:ffffc900045676e0 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffff88801d1cba00
RDX: ffffed101013c416 RSI: ffff88801d1cba00 RDI: 0000000000000003
RBP: ffff8880809e20a8 R08: 0000000000000001 R09: 0000000000000000
R10: ffffed101013c415 R11: 0000000000000000 R12: ffff8880809e1800
R13: ffff8880809e1800 R14: ffff8880809e1888 R15: ffffc90004567828
 mptcp_release_cb+0x134/0x210 net/mptcp/protocol.c:3058
 release_sock+0xb4/0x1b0 net/core/sock.c:3293
 mptcp_wait_data net/mptcp/protocol.c:1812 [inline]
 mptcp_recvmsg+0x100c/0x27b0 net/mptcp/protocol.c:2122
 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: 0033:0x7f3d9eec78d9
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:00007f3d9c43e188 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007f3d9efcbf60 RCX: 00007f3d9eec78d9
RDX: 0000000000000002 RSI: 00000000200017c0 RDI: 0000000000000004
RBP: 00007f3d9ef21cb4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff1ab913ff R14: 00007f3d9c43e300 R15: 0000000000022000
 </TASK>
NMI backtrace for cpu 1
CPU: 1 PID: 28815 Comm: syz-executor.2 Not tainted 5.15.0-rc3-next-20211001-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x25e/0x3f0 kernel/rcu/tree_stall.h:343
 print_cpu_stall kernel/rcu/tree_stall.h:604 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:688 [inline]
 rcu_pending kernel/rcu/tree.c:3889 [inline]
 rcu_sched_clock_irq.cold+0x9d/0x746 kernel/rcu/tree.c:2608
 update_process_times+0x16d/0x200 kernel/time/timer.c:1785
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1428
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
 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:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x38/0x70 kernel/locking/spinlock.c:194
Code: 74 24 10 e8 1a ad 25 f8 48 89 ef e8 62 23 26 f8 81 e3 00 02 00 00 75 25 9c 58 f6 c4 02 75 2d 48 85 db 74 01 fb bf 01 00 00 00 <e8> e3 c0 19 f8 65 8b 05 3c 6e cc 76 85 c0 74 0a 5b 5d c3 e8 d0 a1
RSP: 0018:ffffc900044df728 EFLAGS: 00000206
RAX: 0000000000000006 RBX: 0000000000000200 RCX: 1ffffffff1fac53e
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffff88806b535a40 R08: 0000000000000001 R09: ffffffff8fd17a07
R10: 0000000000000001 R11: 0000000000000000 R12: ffff8880225a8060
R13: dffffc0000000000 R14: ffff8880225a8238 R15: ffffc900044df828
 mptcp_wait_data net/mptcp/protocol.c:1816 [inline]
 mptcp_recvmsg+0x114b/0x27b0 net/mptcp/protocol.c:2122
 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: 0033:0x7fa55bd8a8d9
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:00007fa559301188 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007fa55be8ef60 RCX: 00007fa55bd8a8d9
RDX: 0000000000000002 RSI: 00000000200017c0 RDI: 0000000000000004
RBP: 00007fa55bde4cb4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff7356789f R14: 00007fa559301300 R15: 0000000000022000
 </TASK>
----------------
Code disassembly (best guess):
   0:	05 3a 64 3b 04       	add    $0x43b643a,%eax
   5:	85 c0                	test   %eax,%eax
   7:	74 21                	je     0x2a
   9:	8b 05 4c 97 3b 04    	mov    0x43b974c(%rip),%eax        # 0x43b975b
   f:	85 c0                	test   %eax,%eax
  11:	74 17                	je     0x2a
  13:	65 48 8b 04 25 40 70 	mov    %gs:0x27040,%rax
  1a:	02 00
  1c:	8b 80 64 0a 00 00    	mov    0xa64(%rax),%eax
  22:	85 c0                	test   %eax,%eax
  24:	0f 94 c0             	sete   %al
  27:	0f b6 c0             	movzbl %al,%eax
* 2a:	c3                   	retq <-- trapping instruction
  2b:	cc                   	int3
  2c:	cc                   	int3
  2d:	cc                   	int3
  2e:	cc                   	int3
  2f:	41 54                	push   %r12
  31:	55                   	push   %rbp
  32:	48 c7 c5 08 aa 03 00 	mov    $0x3aa08,%rbp
  39:	53                   	push   %rbx
  3a:	89 fb                	mov    %edi,%ebx
  3c:	e8                   	.byte 0xe8
  3d:	ae                   	scas   %es:(%rdi),%al
  3e:	0c 00                	or     $0x0,%al