rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: (detected by 1, t=10502 jiffies, g=6097, q=232) rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4294953479-4294942976), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor.4 R running task 24952 8136 8135 0x0000400a 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:__memcg_kmem_uncharge+0x213/0x2e0 mm/memcontrol.c:2925 Code: a4 ff 48 c7 c7 98 4b 0d 89 e8 59 97 00 00 bf 01 00 00 00 e8 2f e3 9b ff 65 8b 05 d4 fd 4a 7e 85 c0 74 53 48 83 c4 08 5b 41 5c <41> 5d 41 5e 41 5f 5d c3 49 8d 5f 10 48 89 df be 08 00 00 00 e8 04 RSP: 0018:ffffc900023b6f90 EFLAGS: 00000292 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000001 RBX: ffffea0002523800 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffea0002523800 RBP: ffffc900023b6fa8 R08: dffffc0000000000 R09: fffffbfff120248a R10: fffffbfff120248a R11: 0000000000000000 R12: ffff8880951d7da0 R13: 1ffffd40004a4707 R14: ffffea0002523838 R15: 0000000000000000 memcg_kmem_uncharge include/linux/memcontrol.h:1402 [inline] free_thread_stack+0x12e/0x590 kernel/fork.c:284 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_common kernel/sched/core.c:4236 [inline] preempt_schedule+0xdb/0x120 kernel/sched/core.c:4261 ___preempt_schedule+0x16/0x18 arch/x86/entry/thunk_64.S:50 __raw_spin_unlock include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock+0x3a/0x40 kernel/locking/spinlock.c:183 __register_sysctl_table+0x11d5/0x1290 include/linux/spinlock.h:378 register_net_sysctl+0x2c/0x40 net/sysctl_net.c:121 __addrconf_sysctl_register+0x24f/0x390 net/ipv6/addrconf.c:6850 addrconf_sysctl_register+0x141/0x1a0 net/ipv6/addrconf.c:6897 ipv6_add_dev+0xad5/0x14a0 net/ipv6/addrconf.c:443 addrconf_notify+0x6bc/0x3c90 net/ipv6/addrconf.c:3491 notifier_call_chain kernel/notifier.c:95 [inline] __raw_notifier_call_chain kernel/notifier.c:396 [inline] raw_notifier_call_chain+0xec/0x190 kernel/notifier.c:403 call_netdevice_notifiers_info net/core/dev.c:1893 [inline] call_netdevice_notifiers_extack net/core/dev.c:1905 [inline] call_netdevice_notifiers net/core/dev.c:1919 [inline] register_netdevice+0x1339/0x1830 net/core/dev.c:9344 nsim_create+0x1d4/0x230 drivers/net/netdevsim/netdev.c:309 __nsim_dev_port_add+0x289/0x4d0 drivers/net/netdevsim/dev.c:648 nsim_dev_port_add_all drivers/net/netdevsim/dev.c:697 [inline] nsim_dev_probe+0xb55/0xef0 drivers/net/netdevsim/dev.c:818 nsim_bus_probe+0x15/0x20 drivers/net/netdevsim/bus.c:242 really_probe+0x71c/0xf40 drivers/base/dd.c:548 driver_probe_device+0xfc/0x260 drivers/base/dd.c:721 __device_attach_driver+0x336/0x3f0 drivers/base/dd.c:828 bus_for_each_drv+0x12b/0x180 drivers/base/bus.c:430 __device_attach+0x1ea/0x390 drivers/base/dd.c:894 device_initial_probe+0x1a/0x20 drivers/base/dd.c:941 bus_probe_device+0xb9/0x1f0 drivers/base/bus.c:490 device_add+0x1710/0x1ad0 drivers/base/core.c:2487 device_register+0x1d/0x20 drivers/base/core.c:2560 nsim_bus_dev_new drivers/net/netdevsim/bus.c:288 [inline] new_device_store+0x286/0x510 drivers/net/netdevsim/bus.c:182 bus_attr_store+0x78/0x90 drivers/base/bus.c:121 sysfs_kf_write+0x281/0x2f0 fs/sysfs/file.c:138 kernfs_fop_write+0x3e4/0x4e0 fs/kernfs/file.c:315 __vfs_write+0xb8/0x740 fs/read_write.c:494 vfs_write+0x275/0x590 fs/read_write.c:558 ksys_write+0x117/0x220 fs/read_write.c:611 __do_sys_write fs/read_write.c:623 [inline] __se_sys_write fs/read_write.c:620 [inline] __x64_sys_write+0x7b/0x90 fs/read_write.c:620 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x414130 Code: b0 89 c8 f7 d8 eb ed b8 6e 00 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 83 3d 3d 43 66 00 00 75 14 b8 01 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 c4 1b 00 00 c3 48 83 ec 08 e8 ca fc ff ff RSP: 002b:00007ffd173d9528 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000414130 RDX: 0000000000000003 RSI: 00007ffd173d9550 RDI: 0000000000000004 RBP: 00007ffd173d9550 R08: 0000000000000000 R09: 0000000000000003 R10: 0000000000000075 R11: 0000000000000246 R12: 00000000004bfc97 R13: 0000000000000004 R14: 0000000000000000 R15: 0000000000000000 rcu: rcu_preempt kthread starved for 10554 jiffies! g6097 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 28992 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