rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (10453 ticks this GP) idle=f52/1/0x4000000000000000 softirq=23056/23060 fqs=5234 (t=10501 jiffies g=31021 q=394) NMI backtrace for cpu 1 CPU: 1 PID: 13926 Comm: syz-executor.1 Not tainted 5.10.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 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:337 print_cpu_stall kernel/rcu/tree_stall.h:569 [inline] check_cpu_stall kernel/rcu/tree_stall.h:643 [inline] rcu_pending kernel/rcu/tree.c:3751 [inline] rcu_sched_clock_irq.cold+0x472/0xec3 kernel/rcu/tree.c:2580 update_process_times+0x16d/0x200 kernel/time/timer.c:1782 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1376 __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:1085 [inline] __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1102 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:1096 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628 RIP: 0010:unwind_next_frame+0xe47/0x1f90 arch/x86/kernel/unwind_orc.c:608 Code: c0 74 08 3c 03 0f 8e 49 11 00 00 41 3b 2f 0f 84 5b 05 00 00 bf 01 00 00 00 e8 95 79 1b 00 b8 01 00 00 00 65 8b 15 c9 f8 d1 7e <85> d2 0f 85 37 f2 ff ff e8 33 4e d0 ff e9 2d f2 ff ff 4c 8b 4c 24 RSP: 0018:ffffc90000d90728 EFLAGS: 00000213 RAX: 0000000000000001 RBX: 1ffff920001b20ed RCX: 0000000000000000 RDX: 0000000000000101 RSI: ffffc9000311f928 RDI: 0000000000000001 RBP: ffffc9000311f958 R08: ffffffff8d6d7eb2 R09: 0000000000000001 R10: 0000000000082081 R11: 0000000000000001 R12: ffffc90003118000 R13: ffffc90000d90835 R14: ffffc90000d90850 R15: ffffc90000d90800 arch_stack_walk+0x7d/0xe0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:121 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:461 slab_post_alloc_hook mm/slab.h:512 [inline] slab_alloc_node mm/slub.c:2889 [inline] kmem_cache_alloc_node+0x1e0/0x470 mm/slub.c:2925 __alloc_skb+0x71/0x5a0 net/core/skbuff.c:198 alloc_skb include/linux/skbuff.h:1099 [inline] ndisc_alloc_skb+0x134/0x320 net/ipv6/ndisc.c:420 ndisc_send_rs+0x388/0x700 net/ipv6/ndisc.c:686 addrconf_rs_timer+0x3f2/0x820 net/ipv6/addrconf.c:3874 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1417 expire_timers kernel/time/timer.c:1462 [inline] __run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1731 __run_timers kernel/time/timer.c:1712 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1744 __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:1096 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628 RIP: 0010:debug_spin_unlock kernel/locking/spinlock_debug.c:97 [inline] RIP: 0010:do_raw_spin_unlock+0x3d/0x230 kernel/locking/spinlock_debug.c:138 Code: 83 c7 04 48 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 bc 01 00 00 81 7d 04 ad 4e ad de <0f> 85 74 01 00 00 be 04 00 00 00 48 89 ef e8 50 90 5b 00 48 89 ea RSP: 0018:ffffc9000311f768 EFLAGS: 00000246 RAX: 0000000000000007 RBX: 0000000000000000 RCX: ffffc9000311f710 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff888013cd9d84 RBP: ffff888013cd9d80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffff88802d2db500 R13: 0000000000000000 R14: dffffc0000000000 R15: 00007f77d0d06000 __raw_spin_unlock include/linux/spinlock_api_smp.h:151 [inline] _raw_spin_unlock+0x1a/0x40 kernel/locking/spinlock.c:183 spin_unlock include/linux/spinlock.h:394 [inline] zap_pte_range mm/memory.c:1320 [inline] zap_pmd_range mm/memory.c:1368 [inline] zap_pud_range mm/memory.c:1397 [inline] zap_p4d_range mm/memory.c:1418 [inline] unmap_page_range+0xf98/0x2640 mm/memory.c:1439 unmap_single_vma+0x198/0x300 mm/memory.c:1484 unmap_vmas+0x168/0x2e0 mm/memory.c:1516 exit_mmap+0x2b1/0x5a0 mm/mmap.c:3220 __mmput+0x122/0x470 kernel/fork.c:1083 mmput+0x53/0x60 kernel/fork.c:1104 exit_mm kernel/exit.c:500 [inline] do_exit+0xa97/0x29e0 kernel/exit.c:810 do_group_exit+0x125/0x310 kernel/exit.c:920 get_signal+0x42a/0x1fb0 kernel/signal.c:2792 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:811 handle_signal_work kernel/entry/common.c:147 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x124/0x200 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e159 Code: Unable to access opcode bytes at RIP 0x45e12f. RSP: 002b:00007f77d0417cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000119c0d8 RCX: 000000000045e159 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000119c0d8 RBP: 000000000119c0d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c0dc R13: 00007ffcb4a04f3f R14: 00007f77d04189c0 R15: 000000000119c0dc