syzbot

INFO: rcu_preempt detected stalls on CPUs/tasks:
	(detected by 1, t=10502 jiffies, g=24013, c=24012, q=0)
All QSes seen, last rcu_preempt kthread activity 10502 (4295040859-4295030357), jiffies_till_next_fqs=1, root ->qsmask 0x0
syz-executor.0  R  running task    25264 30362   7320 0x0000000c
Call Trace:
 <IRQ>
 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:kernel_text_address+0x93/0xe0 kernel/extable.c:158
RSP: 0018:ffff8880aeb07850 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10
RAX: 0000000000000001 RBX: ffffffff818326b7 RCX: 0000000000000000
RDX: 1ffff11015d60f19 RSI: 0000000000000000 RDI: ffffffff818326b7
RBP: ffff8880aeb078c8 R08: ffffffff88efc662 R09: ffff888026206f90
R10: ffff8880aeb078b5 R11: 0000000000058071 R12: 0000000000000000
R13: 0000000000000000 R14: ffff888027be8080 R15: ffff88807dcae0e7
 __kernel_text_address+0x9/0x30 kernel/extable.c:105
 unwind_get_return_address arch/x86/kernel/unwind_orc.c:255 [inline]
 unwind_get_return_address+0x5a/0xa0 arch/x86/kernel/unwind_orc.c:250
 __save_stack_trace+0x7b/0xd0 arch/x86/kernel/stacktrace.c:45
 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
 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]
 nr_loopback_queue+0x50/0x210 net/netrom/nr_loopback.c:37
 nr_route_frame+0x5bd/0x815 net/netrom/nr_route.c:799
 nr_transmit_buffer+0x120/0x180 net/netrom/nr_out.c:212
 nr_write_internal+0x642/0xd10 net/netrom/nr_subr.c:208
 nr_t1timer_expiry+0x279/0x310 net/netrom/nr_timer.c:230
 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
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline]
RIP: 0010:lock_acquire+0x1ec/0x3f0 kernel/locking/lockdep.c:3997
RSP: 0018:ffff888026206f40 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10
RAX: 1ffffffff0fa2cd1 RBX: ffff888027be8080 RCX: 00000000c1ba2cc1
RDX: dffffc0000000000 RSI: ffff888027be8950 RDI: 0000000000000282
RBP: ffffffff87de5fc0 R08: 000000000000048a R09: ffffffff8a05dcd0
R10: ffff888027be8950 R11: ffff888027be8080 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000
 fs_reclaim_acquire.part.0+0x20/0x30 mm/page_alloc.c:3551
 slab_pre_alloc_hook mm/slab.h:416 [inline]
 slab_alloc_node mm/slab.c:3297 [inline]
 kmem_cache_alloc_node+0x37/0x7a0 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
 netdev_queue_add_kobject net/core/net-sysfs.c:1347 [inline]
 netdev_queue_update_kobjects+0x283/0x350 net/core/net-sysfs.c:1364
 register_queue_kobjects net/core/net-sysfs.c:1406 [inline]
 netdev_register_kobject+0x287/0x390 net/core/net-sysfs.c:1612
 register_netdevice+0x7ce/0xc70 net/core/dev.c:7660
 veth_newlink+0x3ba/0x8a0 drivers/net/veth.c:416
 rtnl_newlink+0xecb/0x1720 net/core/rtnetlink.c:2728
 rtnetlink_rcv_msg+0x3be/0xb10 net/core/rtnetlink.c:4315
 netlink_rcv_skb+0x127/0x370 net/netlink/af_netlink.c:2433
 netlink_unicast_kernel net/netlink/af_netlink.c:1287 [inline]
 netlink_unicast+0x437/0x620 net/netlink/af_netlink.c:1313
 netlink_sendmsg+0x733/0xbe0 net/netlink/af_netlink.c:1878
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xc5/0x100 net/socket.c:656
 ___sys_sendmsg+0x70a/0x840 net/socket.c:2062
 __sys_sendmsg+0xa3/0x120 net/socket.c:2096
 SYSC_sendmsg net/socket.c:2107 [inline]
 SyS_sendmsg+0x27/0x40 net/socket.c:2103
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45c679
RSP: 002b:00007f4136364c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f41363656d4 RCX: 000000000045c679
RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000018
RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000009f9 R14: 00000000004cc937 R15: 000000000076bf0c
rcu_preempt kthread starved for 10502 jiffies! g24013 c24012 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0
rcu_preempt     R  running task    29920     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