rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (10433 ticks this GP) idle=f7e/1/0x4000000000000000 softirq=24314/24317 fqs=5181 (t=10500 jiffies g=31085 q=908) NMI backtrace for cpu 1 CPU: 1 PID: 14883 Comm: syz-executor.5 Not tainted 5.10.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x1e3/0x21e kernel/rcu/tree_stall.h:331 print_cpu_stall kernel/rcu/tree_stall.h:563 [inline] check_cpu_stall kernel/rcu/tree_stall.h:637 [inline] rcu_pending kernel/rcu/tree.c:3694 [inline] rcu_sched_clock_irq.cold+0x472/0xee8 kernel/rcu/tree.c:2567 update_process_times+0x77/0xd0 kernel/time/timer.c:1709 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:176 tick_sched_timer+0x1d1/0x2a0 kernel/time/tick-sched.c:1328 __run_hrtimer kernel/time/hrtimer.c:1519 [inline] __hrtimer_run_queues+0x1ce/0xea0 kernel/time/hrtimer.c:1583 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline] __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1097 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:91 [inline] sysvec_apic_timer_interrupt+0x48/0x100 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631 RIP: 0010:security_sk_classify_flow+0x18/0x80 security/security.c:2212 Code: 89 df e8 ab bb 35 fe eb dc 66 0f 1f 84 00 00 00 00 00 41 55 49 89 fd 41 54 49 89 f4 55 53 e8 6f 3e f4 fd 48 8b 1d f8 13 68 07 <48> 85 db 74 47 e8 5e 3e f4 fd 49 83 c4 10 48 bd 00 00 00 00 00 fc RSP: 0018:ffffc90000d90a68 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffffffff8ae40840 RCX: 0000000000000000 RDX: ffff88801fe10000 RSI: ffffffff837bc601 RDI: ffff888020c1b100 RBP: ffffc90000d90c30 R08: 0000000000000001 R09: ffffc90000d90b60 R10: fffff520001b2176 R11: 0000000000000000 R12: ffffc90000d90b60 R13: ffff888020c1b100 R14: 0000000000000000 R15: ffff888077391dc0 ndisc_send_skb+0x11d7/0x1720 net/ipv6/ndisc.c:487 ndisc_send_rs+0x12e/0x700 net/ipv6/ndisc.c:702 addrconf_rs_timer+0x3f2/0x820 net/ipv6/addrconf.c:3873 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1410 expire_timers kernel/time/timer.c:1455 [inline] __run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1747 __run_timers kernel/time/timer.c:1728 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1760 __do_softirq+0x2a0/0x9f6 kernel/softirq.c:298 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu kernel/softirq.c:423 [inline] irq_exit_rcu+0x132/0x200 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631 RIP: 0010:__schedule+0xa8/0x2130 kernel/sched/core.c:4420 Code: 4c 63 e8 49 83 fd 07 0f 87 d2 1b 00 00 4a 8d 3c ed c0 c6 e3 8a 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 <0f> 85 fd 1a 00 00 4e 03 24 ed c0 c6 e3 8a 49 8d 84 24 28 0a 00 00 RSP: 0018:ffffc90001aaf630 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 1ffff92000355ece RDX: 1ffffffff15c78d9 RSI: 0000000000000001 RDI: ffffffff8ae3c6c8 RBP: ffffc90001aaf6f8 R08: 0000000000000000 R09: ffff888020716783 R10: ffffed10040e2cf0 R11: 0000000000000000 R12: 0000000000034980 R13: 0000000000000001 R14: dffffc0000000000 R15: 0000000000034980 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:4687 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:40 __raw_spin_unlock include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock+0x36/0x40 kernel/locking/spinlock.c:183 spin_unlock include/linux/spinlock.h:394 [inline] zap_pte_range mm/memory.c:1309 [inline] zap_pmd_range mm/memory.c:1357 [inline] zap_pud_range mm/memory.c:1386 [inline] zap_p4d_range mm/memory.c:1407 [inline] unmap_page_range+0xf98/0x2640 mm/memory.c:1428 unmap_single_vma+0x198/0x300 mm/memory.c:1473 unmap_vmas+0x168/0x2e0 mm/memory.c:1505 exit_mmap+0x2b1/0x530 mm/mmap.c:3220 __mmput+0x122/0x470 kernel/fork.c:1079 mmput+0x53/0x60 kernel/fork.c:1100 exit_mm kernel/exit.c:486 [inline] do_exit+0xa72/0x29b0 kernel/exit.c:796 do_group_exit+0x125/0x310 kernel/exit.c:906 get_signal+0x42a/0x1f10 kernel/signal.c:2758 arch_do_signal+0x82/0x2390 arch/x86/kernel/signal.c:811 exit_to_user_mode_loop kernel/entry/common.c:161 [inline] exit_to_user_mode_prepare+0x100/0x1a0 kernel/entry/common.c:191 syscall_exit_to_user_mode+0x38/0x260 kernel/entry/common.c:266 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e159 Code: Unable to access opcode bytes at RIP 0x45e12f. RSP: 002b:00007fddcc71ac68 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: 0000000000000003 RBX: 0000000000000003 RCX: 000000000045e159 RDX: 0000000000000001 RSI: 0000000000000003 RDI: 0000000000000002 RBP: 000000000119c110 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c0dc R13: 00007fffc0e4c86f R14: 00007fddcc71b9c0 R15: 000000000119c0dc