rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: (detected by 1, t=10502 jiffies, g=7057, q=186) rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4294954511-4294944008), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor.0 R running task 27912 8513 8495 0x80004008 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:1517 [inline] __hrtimer_run_queues+0x403/0x840 kernel/time/hrtimer.c:1579 hrtimer_interrupt+0x38c/0xda0 kernel/time/hrtimer.c:1641 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+0x6/0x190 include/linux/memcontrol.h:652 Code: 60 00 eb 0c e8 eb 27 2e 00 eb 05 e8 e4 27 2e 00 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 ba 27 2e 00 48 83 c3 38 48 89 RSP: 0018:ffffc900023b7790 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 1ffff110129e8d71 RBX: ffff888094f46b88 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 00000000fffffffc RDI: ffffea0002486b40 RBP: ffffc900023b7798 R08: dffffc0000000000 R09: fffffbfff12c962d R10: fffffbfff12c962d R11: 0000000000000000 R12: ffff888094f46c20 R13: dffffc0000000000 R14: 1ffff110129e8d84 R15: ffff8880a92cd478 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:arch_local_irq_restore arch/x86/include/asm/paravirt.h:752 [inline] RIP: 0010:qlink_free+0x91/0xb0 mm/kasan/quarantine.c:151 Code: 77 07 00 74 35 4c 89 f7 57 9d 0f 1f 44 00 00 e8 35 37 c9 ff eb 19 e8 ce 34 c9 ff 48 83 3d 7e 65 77 07 00 74 17 4c 89 f7 57 9d <0f> 1f 44 00 00 5b 41 5e 41 5f 5d c3 0f 0b 0f 0b 0f 0b 0f 0b 90 66 RSP: 0018:ffffc900023b79f8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: ffff88808b088d54 RBX: ffff88809afec800 RCX: ffff88808b0884c0 RDX: 0000000000000000 RSI: ffffffff81b32b3e RDI: 0000000000000286 RBP: ffffc900023b7a10 R08: ffff88808b088d18 R09: ffffed1025fff789 R10: ffffed1025fff789 R11: 0000000000000000 R12: ffff88809afec800 R13: 0000000000000158 R14: 0000000000000286 R15: ffff8880aa5fba80 qlist_free_all mm/kasan/quarantine.c:167 [inline] quarantine_reduce+0x15e/0x1d0 mm/kasan/quarantine.c:260 __kasan_kmalloc+0x46/0x1b0 mm/kasan/common.c:494 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:521 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc mm/slab.c:3320 [inline] kmem_cache_alloc+0x1f5/0x2e0 mm/slab.c:3484 kmem_cache_zalloc include/linux/slab.h:660 [inline] taskstats_tgid_alloc kernel/taskstats.c:565 [inline] taskstats_exit+0xdd/0xbc0 kernel/taskstats.c:604 do_exit+0x56d/0x2000 kernel/exit.c:786 do_group_exit+0x15c/0x2b0 kernel/exit.c:899 __do_sys_exit_group+0x17/0x20 kernel/exit.c:910 __se_sys_exit_group+0x14/0x20 kernel/exit.c:908 __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:908 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45af49 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffe81daf3d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 000000000000001e RCX: 000000000045af49 RDX: 0000000000414ae1 RSI: fffffffffffffff7 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffffffffffff R09: 00007ffe81daf430 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffe81daf430 R14: 0000000000000000 R15: 00007ffe81daf440 rcu: rcu_preempt kthread starved for 10547 jiffies! g7057 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29104 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