rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: (detected by 0, t=10502 jiffies, g=6433, q=81) rcu: All QSes seen, last rcu_preempt kthread activity 10501 (4294953751-4294943250), jiffies_till_next_fqs=1, root ->qsmask 0x0 udevd R running task 28312 8155 8103 0x8000400a Call Trace: sched_show_task+0x40f/0x560 kernel/sched/core.c:5954 print_other_cpu_stall kernel/rcu/tree_stall.h:410 [inline] check_cpu_stall kernel/rcu/tree_stall.h:538 [inline] rcu_pending kernel/rcu/tree.c:2827 [inline] rcu_sched_clock_irq+0x1861/0x1ad0 kernel/rcu/tree.c:2271 update_process_times+0x12d/0x180 kernel/time/timer.c:1726 tick_sched_handle kernel/time/tick-sched.c:167 [inline] tick_sched_timer+0x263/0x420 kernel/time/tick-sched.c:1310 __run_hrtimer kernel/time/hrtimer.c:1514 [inline] __hrtimer_run_queues+0x403/0x840 kernel/time/hrtimer.c:1576 hrtimer_interrupt+0x38c/0xda0 kernel/time/hrtimer.c:1638 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline] smp_apic_timer_interrupt+0x109/0x280 arch/x86/kernel/apic/apic.c:1135 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:mod_memcg_page_state+0x16/0x190 include/linux/memcontrol.h:653 Code: 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d c3 0f 1f 44 00 00 55 48 89 e5 41 57 41 56 41 54 53 41 89 f6 48 89 fb e8 da 28 2e 00 <48> 83 c3 38 48 89 d8 48 c1 e8 03 49 bc 00 00 00 00 00 fc ff df 42 RSP: 0018:ffffc90002597628 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffffffff81487326 RBX: ffffea00029e2880 RCX: ffff8880a7d6a5c0 RDX: 0000000000000000 RSI: 00000000fffffffc RDI: ffffea00029e2880 RBP: ffffc90002597648 R08: dffffc0000000000 R09: fffffbfff120248a R10: fffffbfff120248a R11: 0000000000000000 R12: ffff888093e44aa0 R13: dffffc0000000000 R14: 00000000fffffffc R15: ffff888090145528 free_thread_stack+0x168/0x590 kernel/fork.c:280 release_task_stack kernel/fork.c:440 [inline] put_task_stack+0xa3/0x130 kernel/fork.c:451 finish_task_switch+0x3f1/0x550 kernel/sched/core.c:3256 context_switch kernel/sched/core.c:3388 [inline] __schedule+0x9a8/0xcc0 kernel/sched/core.c:4081 preempt_schedule_irq+0xc1/0x140 kernel/sched/core.c:4338 retint_kernel+0x1b/0x2b RIP: 0010:compound_head include/linux/page-flags.h:176 [inline] RIP: 0010:PageSwapCache include/linux/page-flags.h:383 [inline] RIP: 0010:free_swap_cache+0x49/0x2c0 mm/swap_state.c:267 Code: cd 2f cb ff 49 8d 5d 08 48 89 d8 48 c1 e8 03 48 89 45 c8 42 80 3c 30 00 74 08 48 89 df e8 af a6 06 00 48 89 5d d0 4d 8b 75 08 <4c> 89 f6 48 83 e6 01 31 ff e8 c9 33 cb ff 4c 89 f0 4c 89 6d c0 48 RSP: 0018:ffffc900025978a0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 1ffffd40004bd4d9 RBX: ffffea00025ea6c8 RCX: ffff8880a7d6a5c0 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffea00025ea6c0 RBP: ffffc900025978e0 R08: ffffffff81ab6dca R09: fffff940004bd4d1 R10: fffff940004bd4d1 R11: 0000000000000000 R12: 0000000000000123 R13: ffffea00025ea6c0 R14: ffffea00025ea688 R15: 0000000000000149 free_pages_and_swap_cache+0x7a/0xb0 mm/swap_state.c:295 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline] tlb_flush_mmu_free mm/mmu_gather.c:184 [inline] tlb_flush_mmu+0x755/0x8f0 mm/mmu_gather.c:191 tlb_finish_mmu+0xd2/0x1f0 mm/mmu_gather.c:272 exit_mmap+0x29b/0x530 mm/mmap.c:3142 __mmput+0x120/0x3a0 kernel/fork.c:1082 mmput+0x5d/0x70 kernel/fork.c:1103 exec_mmap fs/exec.c:1047 [inline] flush_old_exec+0x551/0x6d0 fs/exec.c:1280 load_elf_binary+0x652/0x3670 fs/binfmt_elf.c:847 search_binary_handler+0x1a5/0x660 fs/exec.c:1658 exec_binprm fs/exec.c:1701 [inline] __do_execve_file+0x1573/0x1cd0 fs/exec.c:1821 do_execveat_common fs/exec.c:1867 [inline] do_execve fs/exec.c:1884 [inline] __do_sys_execve fs/exec.c:1960 [inline] __se_sys_execve fs/exec.c:1955 [inline] __x64_sys_execve+0x94/0xb0 fs/exec.c:1955 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7eff51372207 Code: Bad RIP value. RSP: 002b:00007ffc6a7e1a28 EFLAGS: 00000206 ORIG_RAX: 000000000000003b RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 00007eff51372207 RDX: 0000000002413fe0 RSI: 00007ffc6a7e1b20 RDI: 00007ffc6a7e2b30 RBP: 0000000000625500 R08: 0000000000001fa7 R09: 0000000000001fa7 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000002413fe0 R13: 0000000000000007 R14: 0000000002403250 R15: 0000000000000005 rcu: rcu_preempt kthread starved for 10542 jiffies! g6433 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29032 10 2 0x80004000 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x9a0/0xcc0 kernel/sched/core.c:4081 schedule+0x181/0x210 kernel/sched/core.c:4155 schedule_timeout+0x14f/0x240 kernel/time/timer.c:1895 rcu_gp_fqs_loop kernel/rcu/tree.c:1661 [inline] rcu_gp_kthread+0xed8/0x1770 kernel/rcu/tree.c:1821 kthread+0x332/0x350 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352