INFO: rcu_preempt detected stalls on CPUs/tasks: (detected by 0, t=10502 jiffies, g=9907, c=9906, q=233) All QSes seen, last rcu_preempt kthread activity 10503 (4294998637-4294988134), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor.3 R running task 28032 13900 12871 0x00000008 Call Trace: sched_show_task kernel/sched/core.c:5168 [inline] sched_show_task.cold+0x2e3/0x347 kernel/sched/core.c:5143 print_other_cpu_stall kernel/rcu/tree.c:1501 [inline] check_cpu_stall kernel/rcu/tree.c:1616 [inline] __rcu_pending kernel/rcu/tree.c:3390 [inline] rcu_pending kernel/rcu/tree.c:3452 [inline] rcu_check_callbacks.cold+0xd3f/0xdaa kernel/rcu/tree.c:2792 update_process_times+0x29/0x60 kernel/time/timer.c:1590 tick_sched_handle+0x7d/0x150 kernel/time/tick-sched.c:165 tick_sched_timer+0x3e/0x120 kernel/time/tick-sched.c:1223 __run_hrtimer kernel/time/hrtimer.c:1223 [inline] __hrtimer_run_queues+0x25c/0xbb0 kernel/time/hrtimer.c:1287 hrtimer_interrupt+0x1e6/0x5e0 kernel/time/hrtimer.c:1321 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1075 [inline] smp_apic_timer_interrupt+0x117/0x5e0 arch/x86/kernel/apic/apic.c:1100 apic_timer_interrupt+0x8f/0xa0 arch/x86/entry/entry_64.S:792 RIP: 0010:ipv6_get_ifaddr+0x1f4/0x520 net/ipv6/addrconf.c:1917 RSP: 0000:ffff8880aea07c38 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 RAX: 1ffff11007632e48 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: 0000000000000100 RSI: ffffffff86e45700 RDI: ffff88808f98ae20 RBP: ffff8880aea07d20 R08: 0000000000000000 R09: 0000000000022296 R10: ffff8880509d0e20 R11: ffff8880509d0500 R12: ffff88808f98ad00 R13: ffff88807ce54780 R14: ffffed1015d40fa4 R15: ffff88803b197240 ndisc_send_rs+0x176/0x630 net/ipv6/ndisc.c:646 addrconf_rs_timer+0x289/0x5a0 net/ipv6/addrconf.c:3761 call_timer_fn+0x14a/0x650 kernel/time/timer.c:1279 expire_timers kernel/time/timer.c:1318 [inline] __run_timers kernel/time/timer.c:1636 [inline] __run_timers kernel/time/timer.c:1604 [inline] run_timer_softirq+0x52a/0x1390 kernel/time/timer.c:1649 __do_softirq+0x254/0x9bf kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x15b/0x1a0 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:648 [inline] smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1102 apic_timer_interrupt+0x8f/0xa0 arch/x86/entry/entry_64.S:792 RIP: 0010:_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:153 RSP: 0000:ffff88805678f930 EFLAGS: 00000296 ORIG_RAX: ffffffffffffff10 RAX: ffffffff812860b4 RBX: ffffea00020e1580 RCX: 00000000365034ea RDX: dffffc0000000000 RSI: ffff8880509d0dd0 RDI: ffff8880a07b4738 RBP: ffff8880a07b4738 R08: 0000000000001d49 R09: ffffffff8a06a2c8 R10: ffff8880509d0dd0 R11: ffff8880509d0500 R12: ffff8880a07b4738 R13: 00003ffffffff000 R14: ffffffff87c6ac90 R15: dffffc0000000000 spin_lock include/linux/spinlock.h:317 [inline] sync_global_pgds+0x204/0x400 arch/x86/mm/init_64.c:162 __vmalloc_node_range+0x3a2/0x6c0 mm/vmalloc.c:1772 __vmalloc_node mm/vmalloc.c:1815 [inline] __vmalloc_node_flags mm/vmalloc.c:1829 [inline] vmalloc+0x42/0x50 mm/vmalloc.c:1851 bpf_prog_calc_tag+0xaf/0x660 kernel/bpf/core.c:162 replace_map_fd_with_map_ptr kernel/bpf/verifier.c:4436 [inline] bpf_check+0x390/0x18a0 kernel/bpf/verifier.c:5030 bpf_prog_load+0x5e9/0xe00 kernel/bpf/syscall.c:1057 SYSC_bpf kernel/bpf/syscall.c:1509 [inline] SyS_bpf+0x456/0x2d12 kernel/bpf/syscall.c:1475 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45c849 RSP: 002b:00007fcb6ae19c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fcb6ae1a6d4 RCX: 000000000045c849 RDX: 0000000000000048 RSI: 00000000200054c0 RDI: 0000000000000005 RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000068 R14: 00000000004c3099 R15: 000000000076bf0c rcu_preempt kthread starved for 10544 jiffies! g9907 c9906 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0 rcu_preempt R running task 29920 8 2 0x80000000 Call Trace: schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_timeout+0x43c/0xe40 kernel/time/timer.c:1746 rcu_gp_kthread+0xb8e/0x1ce0 kernel/rcu/tree.c:2255 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404