INFO: rcu_preempt detected stalls on CPUs/tasks: (detected by 0, t=10502 jiffies, g=7763, c=7762, q=292) All QSes seen, last rcu_preempt kthread activity 10184 (4294972175-4294961991), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor.0 R running task 27840 16560 6341 0x8000000c Call Trace: sched_show_task kernel/sched/core.c:5168 [inline] sched_show_task.cold+0x335/0x399 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.isra.0+0x73/0x150 kernel/time/tick-sched.c:165 tick_sched_timer+0x41/0x120 kernel/time/tick-sched.c:1223 __run_hrtimer kernel/time/hrtimer.c:1223 [inline] __hrtimer_run_queues+0x24b/0xb90 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+0x117/0x5f0 arch/x86/kernel/apic/apic.c:1100 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793 RIP: 0010:ipv6_get_ifaddr+0x1f4/0x520 net/ipv6/addrconf.c:1917 RSP: 0018:ffff8880aec07c08 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 RAX: 1ffff110122a2ed0 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: 0000000000000100 RSI: ffffffff86c449a0 RDI: ffff88808ccf6e60 RBP: ffff8880aec07cf0 R08: 0000000000000000 R09: 0000000000022296 R10: ffff88808a93ad00 R11: ffff88808a93a400 R12: ffff88808ccf6d40 R13: ffff88806fe88040 R14: ffffed1015d80f9e R15: ffff888091517680 ndisc_send_rs+0x176/0x630 net/ipv6/ndisc.c:646 addrconf_rs_timer+0x280/0x5a0 net/ipv6/addrconf.c:3765 call_timer_fn+0x14a/0x650 kernel/time/timer.c:1279 expire_timers+0x233/0x4d0 kernel/time/timer.c:1318 __run_timers kernel/time/timer.c:1636 [inline] run_timer_softirq+0x1d8/0x5b0 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+0x141/0x5f0 arch/x86/kernel/apic/apic.c:1102 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline] RIP: 0010:lock_acquire+0x1ec/0x3f0 kernel/locking/lockdep.c:4001 RSP: 0018:ffff8880665d76f8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff0f62cd1 RBX: ffff88808a93a400 RCX: ffff88808a93ac88 RDX: dffffc0000000000 RSI: ffff88808a93acb0 RDI: 0000000000000282 RBP: ffffffff87b84be0 R08: 0000000000000000 R09: 0000000000020012 R10: ffff88808a93acb0 R11: ffff88808a93a400 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000002 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:242 [inline] rcu_read_lock include/linux/rcupdate.h:629 [inline] lock_page_memcg+0x36/0x220 mm/memcontrol.c:1669 page_remove_file_rmap mm/rmap.c:1211 [inline] page_remove_rmap+0x193/0x920 mm/rmap.c:1296 zap_pte_range mm/memory.c:1342 [inline] zap_pmd_range mm/memory.c:1444 [inline] zap_pud_range mm/memory.c:1473 [inline] zap_p4d_range mm/memory.c:1494 [inline] unmap_page_range+0xe6c/0x1d80 mm/memory.c:1515 unmap_single_vma+0x147/0x2b0 mm/memory.c:1560 unmap_vmas+0x9d/0x160 mm/memory.c:1590 exit_mmap+0x271/0x4b0 mm/mmap.c:3056 __mmput kernel/fork.c:930 [inline] mmput kernel/fork.c:951 [inline] mmput+0xfa/0x3a0 kernel/fork.c:946 exit_mm kernel/exit.c:545 [inline] do_exit+0x93c/0x2ae0 kernel/exit.c:845 do_group_exit+0x100/0x2e0 kernel/exit.c:955 get_signal+0x385/0x1c90 kernel/signal.c:2423 do_signal+0x7c/0x15d0 arch/x86/kernel/signal.c:814 exit_to_usermode_loop+0x160/0x200 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45cb09 RSP: 002b:00007faa5e657c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: 0000000000000004 RBX: 00000000004db1c0 RCX: 000000000045cb09 RDX: 0000000000000048 RSI: 00000000200054c0 RDI: 0000000000000005 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000070 R14: 00000000004c3414 R15: 00007faa5e6586d4 rcu_preempt kthread starved for 10227 jiffies! g7763 c7762 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0 rcu_preempt R running task 29312 8 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x8a6/0x1d70 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_timeout+0x4df/0xe50 kernel/time/timer.c:1746 rcu_gp_kthread+0xb3d/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