rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-...!: (10499 ticks this GP) idle=542/1/0x4000000000000002 softirq=11689/11689 fqs=5 (t=10500 jiffies g=6877 q=393) rcu: rcu_preempt kthread starved for 10487 jiffies! g6877 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 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 NMI backtrace for cpu 0 CPU: 0 PID: 8317 Comm: syz-executor.5 Not tainted 5.4.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fb/0x318 lib/dump_stack.c:118 nmi_cpu_backtrace+0xaf/0x1a0 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x174/0x290 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x10/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x15a/0x220 kernel/rcu/tree_stall.h:254 print_cpu_stall kernel/rcu/tree_stall.h:455 [inline] check_cpu_stall kernel/rcu/tree_stall.h:529 [inline] rcu_pending kernel/rcu/tree.c:2827 [inline] rcu_sched_clock_irq+0xe25/0x1ad0 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+0x168/0x190 include/linux/memcontrol.h:655 Code: c7 28 96 0a 89 e8 a8 9e 69 00 48 83 3d c8 21 c2 07 00 74 2d e8 99 27 2e 00 4c 89 ff 57 9d 0f 1f 44 00 00 5b 41 5c 41 5e 41 5f <5d> c3 e8 81 27 2e 00 0f 0b e8 7a 27 2e 00 0f 0b e8 73 27 2e 00 0f RSP: 0018:ffffc90002897368 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffffffff81487433 RBX: ffff8880a0a78808 RCX: ffff8880a70b0280 RDX: 0000000000000000 RSI: 00000000fffffffc RDI: ffffea0002334040 RBP: ffffc90002897368 R08: dffffc0000000000 R09: fffffbfff120248a R10: fffffbfff120248a R11: 0000000000000000 R12: ffff8880a0a788a0 R13: dffffc0000000000 R14: 1ffff1101414f114 R15: ffff8880a074d728 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:kmem_cache_free+0xc8/0xf0 mm/slab.c:3695 Code: 58 07 00 74 42 4c 89 f7 57 9d 0f 1f 44 00 00 e8 0e 98 ca ff eb 19 e8 a7 95 ca ff 48 83 3d 07 f7 58 07 00 74 24 4c 89 f7 57 9d <0f> 1f 44 00 00 4c 89 e7 4c 89 fe e8 58 01 00 00 5b 41 5c 41 5e 41 RSP: 0018:ffffc900028975c8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: ffff8880a70b0b14 RBX: ffff88821bb74700 RCX: ffffffff815c0597 RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000286 RBP: ffffc900028975e8 R08: ffff8880a70b0ad8 R09: fffffbfff13c8d33 R10: fffffbfff13c8d33 R11: 0000000000000000 R12: ffffffff863fe34e R13: 0000000000000000 R14: 0000000000000286 R15: ffff88806cb77b80 kfree_skbmem net/core/skbuff.c:644 [inline] __kfree_skb+0x13e/0x1c0 net/core/skbuff.c:680 consume_skb+0x72/0x110 net/core/skbuff.c:838 netlink_broadcast_filtered+0x1056/0x1170 net/netlink/af_netlink.c:1512 netlink_broadcast+0x3a/0x50 net/netlink/af_netlink.c:1534 nlmsg_multicast include/net/netlink.h:968 [inline] genlmsg_multicast_netns include/net/genetlink.h:298 [inline] devlink_param_notify net/core/devlink.c:3274 [inline] devlink_params_publish+0x1d9/0x260 net/core/devlink.c:7216 nsim_dev_probe+0xb7f/0xef0 drivers/net/netdevsim/dev.c:822 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:00007ffe6a21d838 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000414130 RDX: 0000000000000003 RSI: 00007ffe6a21d860 RDI: 0000000000000004 RBP: 00007ffe6a21d860 R08: 0000000000000000 R09: 0000000000000003 R10: 0000000000000075 R11: 0000000000000246 R12: 00000000004bfc97 R13: 0000000000000004 R14: 0000000000000000 R15: 0000000000000000