INFO: rcu_preempt detected stalls on CPUs/tasks: (detected by 1, t=10502 jiffies, g=2982, c=2981, q=351) All QSes seen, last rcu_preempt kthread activity 10503 (4294963397-4294952894), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor.1 R running task 25936 9534 7484 0x00000008 Call Trace: sched_show_task kernel/sched/core.c:5168 [inline] sched_show_task.cold+0x2e3/0x347 kernel/sched/core.c:5143 print_other_cpu_stall kernel/rcu/tree.c:1501 [inline] check_cpu_stall kernel/rcu/tree.c:1616 [inline] __rcu_pending kernel/rcu/tree.c:3390 [inline] rcu_pending kernel/rcu/tree.c:3452 [inline] rcu_check_callbacks.cold+0xd3f/0xdaa kernel/rcu/tree.c:2792 update_process_times+0x29/0x60 kernel/time/timer.c:1590 tick_sched_handle+0x7d/0x150 kernel/time/tick-sched.c:165 tick_sched_timer+0x3e/0x120 kernel/time/tick-sched.c:1223 __run_hrtimer kernel/time/hrtimer.c:1223 [inline] __hrtimer_run_queues+0x25c/0xbb0 kernel/time/hrtimer.c:1287 hrtimer_interrupt+0x1e6/0x5e0 kernel/time/hrtimer.c:1321 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1075 [inline] smp_apic_timer_interrupt+0x117/0x5e0 arch/x86/kernel/apic/apic.c:1100 apic_timer_interrupt+0x8f/0xa0 arch/x86/entry/entry_64.S:792 RIP: 0010:preempt_count_sub+0xaf/0x130 kernel/sched/core.c:3136 RSP: 0018:ffff8880aeb077b0 EFLAGS: 00000297 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000102 RBX: 0000000000000001 RCX: 0000000000000000 RDX: 0000000000000004 RSI: ffff8880aeb07778 RDI: 0000000000000001 RBP: 1ffff11015d60eff R08: 0000000000000001 R09: ffff888095fd7d70 R10: ffff8880aeb078a5 R11: 0000000000058071 R12: ffff888095fd7da8 R13: ffff888095fd0000 R14: ffff888095fd7da8 R15: 0000000000000001 unwind_next_frame+0xbc6/0x17a0 arch/x86/kernel/unwind_orc.c:498 __save_stack_trace+0x6b/0xd0 arch/x86/kernel/stacktrace.c:44 save_stack+0x32/0xa0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc mm/kasan/kasan.c:551 [inline] kasan_kmalloc+0xbf/0xe0 mm/kasan/kasan.c:529 kmem_cache_alloc_node+0x148/0x7a0 mm/slab.c:3642 __alloc_skb+0x9a/0x4c0 net/core/skbuff.c:193 alloc_skb include/linux/skbuff.h:980 [inline] new_skb+0x24/0x1c0 drivers/block/aoe/aoecmd.c:67 aoecmd_cfg_pkts drivers/block/aoe/aoecmd.c:427 [inline] aoecmd_cfg+0x155/0x570 drivers/block/aoe/aoecmd.c:1392 discover_timer drivers/block/aoe/aoemain.c:44 [inline] discover_timer+0xc5/0x160 drivers/block/aoe/aoemain.c:21 call_timer_fn+0x14a/0x650 kernel/time/timer.c:1279 expire_timers kernel/time/timer.c:1318 [inline] __run_timers kernel/time/timer.c:1636 [inline] __run_timers kernel/time/timer.c:1604 [inline] run_timer_softirq+0x52a/0x1390 kernel/time/timer.c:1649 __do_softirq+0x254/0x9bf kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x15b/0x1a0 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:648 [inline] smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1102 apic_timer_interrupt+0x8f/0xa0 arch/x86/entry/entry_64.S:792 RIP: 0010:preempt_schedule_irq+0xab/0x140 kernel/sched/core.c:3611 RSP: 0018:ffff888095fd7830 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff0fa2cd3 RBX: dffffc0000000000 RCX: 1ffff1100b7315d6 RDX: 0000000000000000 RSI: ffff88805b98aeb8 RDI: 0000000000000001 RBP: ffffed100b7314b8 R08: 00000025bcb1849b R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88805b98a5c0 R13: ffffffff87d16698 R14: 0000000000000000 R15: 0000000000000000 retint_kernel+0x1b/0x2d RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline] RIP: 0010:qlink_free mm/kasan/quarantine.c:150 [inline] RIP: 0010:qlist_free_all+0xfc/0x140 mm/kasan/quarantine.c:166 RSP: 0018:ffff888095fd7900 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000007 RBX: ffff88805ce64600 RCX: 1ffff1100b7315d6 RDX: 0000000000000000 RSI: ffff88805b98aeb8 RDI: 0000000000000282 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888096dd8600 R13: ffff888095fd7938 R14: ffff8880aa586e40 R15: 0000000000000282 quarantine_reduce+0x140/0x170 mm/kasan/quarantine.c:259 kasan_kmalloc+0x95/0xe0 mm/kasan/kasan.c:536 slab_post_alloc_hook mm/slab.h:442 [inline] slab_alloc_node mm/slab.c:3333 [inline] kmem_cache_alloc_node+0x135/0x7a0 mm/slab.c:3640 __alloc_skb+0x9a/0x4c0 net/core/skbuff.c:193 alloc_skb include/linux/skbuff.h:980 [inline] kobject_uevent_env+0x6d1/0xc50 lib/kobject_uevent.c:479 rx_queue_add_kobject net/core/net-sysfs.c:931 [inline] net_rx_queue_update_kobjects+0xcd/0x3e0 net/core/net-sysfs.c:953 register_queue_kobjects net/core/net-sysfs.c:1401 [inline] netdev_register_kobject+0x26e/0x390 net/core/net-sysfs.c:1612 register_netdevice+0x7ce/0xc70 net/core/dev.c:7660 register_netdev+0x17/0x30 net/core/dev.c:7798 br_add_bridge+0x97/0xe0 net/bridge/br_if.c:392 br_ioctl_deviceless_stub+0x565/0x5f0 net/bridge/br_ioctl.c:378 sock_ioctl+0x254/0x450 net/socket.c:1038 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xfe0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45c849 RSP: 002b:00007f369a7fcc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f369a7fd6d4 RCX: 000000000045c849 RDX: 0000000020000100 RSI: 00000000000089a0 RDI: 0000000000000008 RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000006af R14: 00000000004c96a5 R15: 000000000076bf0c rcu_preempt kthread starved for 10572 jiffies! g2982 c2981 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0 rcu_preempt R running task 29984 8 2 0x80000000 Call Trace: schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_timeout+0x43c/0xe40 kernel/time/timer.c:1746 rcu_gp_kthread+0xb8e/0x1ce0 kernel/rcu/tree.c:2255 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404