rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10499 ticks this GP) idle=e69/1/0x4000000000000000 softirq=45547/45547 fqs=5240 
	(t=10500 jiffies g=71437 q=265)
NMI backtrace for cpu 1
CPU: 1 PID: 19338 Comm: syz-executor.3 Not tainted 5.15.0-rc2-next-20210920-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:627 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:711 [inline]
 rcu_pending kernel/rcu/tree.c:3878 [inline]
 rcu_sched_clock_irq.cold+0x9d/0x746 kernel/rcu/tree.c:2597
 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>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0xd/0x60 kernel/kcov.c:197
Code: ff ff ba 08 00 00 00 4d 8b 03 48 0f bd ca 49 8b 45 00 48 63 c9 e9 64 ff ff ff 0f 1f 00 65 8b 05 a9 ce 8b 7e 89 c1 48 8b 34 24 <81> e1 00 01 00 00 65 48 8b 14 25 40 f0 01 00 a9 00 01 ff 00 74 0e
RSP: 0018:ffffc9000ab6f730 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff88807772a098 RCX: 0000000000000000
RDX: 0000000000040000 RSI: ffffffff88e98b22 RDI: 0000000000000003
RBP: ffff88807772a098 R08: 0000000000000f96 R09: ffffffff8fd06a07
R10: ffffffff88e99517 R11: 0000000000000000 R12: ffff8880777297e0
R13: ffffc9000ab6f828 R14: dffffc0000000000 R15: ffff888077729780
 mptcp_cleanup_rbuf net/mptcp/protocol.c:486 [inline]
 mptcp_recvmsg+0x722/0x27b0 net/mptcp/protocol.c:2027
 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: 0033:0x7f8b70c54739
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:00007f8b6e1cb188 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007f8b70d58f80 RCX: 00007f8b70c54739
RDX: 0000000000000002 RSI: 00000000200017c0 RDI: 0000000000000005
RBP: 00007f8b70caecc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000246 R12: 00007f8b70d58f80
R13: 00007ffe171dc67f R14: 00007f8b6e1cb300 R15: 0000000000022000
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	ba 08 00 00 00       	mov    $0x8,%edx
   5:	4d 8b 03             	mov    (%r11),%r8
   8:	48 0f bd ca          	bsr    %rdx,%rcx
   c:	49 8b 45 00          	mov    0x0(%r13),%rax
  10:	48 63 c9             	movslq %ecx,%rcx
  13:	e9 64 ff ff ff       	jmpq   0xffffff7c
  18:	0f 1f 00             	nopl   (%rax)
  1b:	65 8b 05 a9 ce 8b 7e 	mov    %gs:0x7e8bcea9(%rip),%eax        # 0x7e8bcecb
  22:	89 c1                	mov    %eax,%ecx
  24:	48 8b 34 24          	mov    (%rsp),%rsi
* 28:	81 e1 00 01 00 00    	and    $0x100,%ecx <-- trapping instruction
  2e:	65 48 8b 14 25 40 f0 	mov    %gs:0x1f040,%rdx
  35:	01 00
  37:	a9 00 01 ff 00       	test   $0xff0100,%eax
  3c:	74 0e                	je     0x4c