rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: (detected by 0, t=10502 jiffies, g=6785, q=108) rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4294954199-4294943696), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor.3 R running task 24888 8436 8434 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+0x44/0x2e0 mm/memcontrol.c:2913 Code: fc ff df 4c 8d 77 38 4d 89 f5 49 c1 ed 03 41 80 7c 05 00 00 74 08 4c 89 f7 e8 d8 f4 fa ff 4d 8b 3e b8 01 00 00 00 89 d9 d3 e0 <4d> 85 ff 0f 84 bf 01 00 00 4c 39 3d 04 ce 8c 07 0f 84 6e 02 00 00 RSP: 0018:ffffc900022a6ba8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffea000255cbc0 RBP: ffffc900022a6bd8 R08: dffffc0000000000 R09: fffffbfff120248a R10: fffffbfff120248a R11: 0000000000000000 R12: ffffea000255cbc0 R13: 1ffffd40004ab97f R14: ffffea000255cbf8 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_irq+0xc1/0x140 kernel/sched/core.c:4338 retint_kernel+0x1b/0x2b RIP: 0010:unwind_next_frame+0x6e/0x7a0 arch/x86/kernel/unwind_frame.c:269 Code: 84 f6 05 00 00 48 89 9d 68 ff ff ff 4d 8d 7d 58 4c 89 f8 48 c1 e8 03 48 89 45 a8 42 80 3c 30 00 74 08 4c 89 ff e8 b2 e6 7c 00 <49> 8b 1f 48 85 db 74 30 4c 8d b3 88 00 00 00 4c 89 f0 48 c1 e8 03 RSP: 0018:ffffc900022a6e38 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 1ffff92000454de7 RBX: 1ffff92000454ddc RCX: 0000000000000000 RDX: 000000000000000c RSI: 0000000000000040 RDI: ffffc900022a6ee0 RBP: ffffc900022a6ed0 R08: ffffffff81659d9d R09: ffffc900022a6ee0 R10: fffff52000454de8 R11: 0000000000000000 R12: ffff88808d5ea400 R13: ffffc900022a6ee0 R14: dffffc0000000000 R15: ffffc900022a6f38 arch_stack_walk+0xb4/0xe0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xb6/0x150 kernel/stacktrace.c:123 save_stack mm/kasan/common.c:71 [inline] set_track mm/kasan/common.c:79 [inline] __kasan_kmalloc+0x11c/0x1b0 mm/kasan/common.c:512 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:520 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] __kernfs_new_node+0x97/0x680 fs/kernfs/dir.c:627 kernfs_new_node+0x97/0x170 fs/kernfs/dir.c:689 __kernfs_create_file+0x4a/0x2f0 fs/kernfs/file.c:1001 sysfs_add_file_mode_ns+0x2dc/0x3a0 fs/sysfs/file.c:305 create_files fs/sysfs/group.c:63 [inline] internal_create_group+0x4be/0xd80 fs/sysfs/group.c:148 sysfs_create_group+0x1f/0x30 fs/sysfs/group.c:174 netdev_queue_add_kobject net/core/net-sysfs.c:1471 [inline] netdev_queue_update_kobjects+0x1b0/0x3c0 net/core/net-sysfs.c:1493 register_queue_kobjects net/core/net-sysfs.c:1535 [inline] netdev_register_kobject+0x241/0x2f0 net/core/net-sysfs.c:1753 register_netdevice+0xfc9/0x1830 net/core/dev.c:9315 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:00007ffdb0a6c4a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000414130 RDX: 0000000000000003 RSI: 00007ffdb0a6c4d0 RDI: 0000000000000004 RBP: 00007ffdb0a6c4d0 R08: 0000000000000000 R09: 0000000000000003 R10: 0000000000000075 R11: 0000000000000246 R12: 00000000004bfc97 R13: 0000000000000004 R14: 0000000000000000 R15: 0000000000000000 rcu: rcu_preempt kthread starved for 10573 jiffies! g6785 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 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