INFO: rcu_preempt detected stalls on CPUs/tasks: (detected by 1, t=10502 jiffies, g=1911, c=1910, q=905) All QSes seen, last rcu_preempt kthread activity 10502 (4294965764-4294955262), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor.3 R running task 28960 7874 6361 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:unwind_next_frame+0x2df/0x17a0 arch/x86/kernel/unwind_orc.c:349 RSP: 0018:ffff8880aeb06ec8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000005 RBX: ffff8880aeb06f78 RCX: ffffffff8500bff5 RDX: 0000000000000006 RSI: ffffffff89398064 RDI: ffffffff88d27458 RBP: 1ffff11015d60de0 R08: ffffffff893980e6 R09: ffff8880aeb07468 R10: ffff8880aeb06fad R11: 0000000000058071 R12: ffffffff893980e2 R13: ffff8880aeb06fb0 R14: ffff8880aeb06fc0 R15: 0000000000000002 __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 slab_post_alloc_hook mm/slab.h:442 [inline] slab_alloc mm/slab.c:3390 [inline] kmem_cache_alloc+0x114/0x770 mm/slab.c:3550 kmem_cache_zalloc include/linux/slab.h:651 [inline] fill_pool lib/debugobjects.c:110 [inline] __debug_object_init+0x5b7/0x830 lib/debugobjects.c:341 debug_object_init lib/debugobjects.c:393 [inline] debug_object_activate+0x274/0x450 lib/debugobjects.c:474 debug_rcu_head_queue kernel/rcu/rcu.h:152 [inline] __call_rcu.constprop.0+0x31/0x7e0 kernel/rcu/tree.c:3050 dst_release+0x56/0x80 net/core/dst.c:188 refdst_drop include/net/dst.h:286 [inline] skb_dst_drop include/net/dst.h:298 [inline] skb_release_head_state+0x1e6/0x250 net/core/skbuff.c:612 skb_release_all+0x11/0x60 net/core/skbuff.c:629 __kfree_skb net/core/skbuff.c:645 [inline] kfree_skb+0xae/0x340 net/core/skbuff.c:663 ip6gre_tunnel_xmit+0x272/0xf40 net/ipv6/ip6_gre.c:713 __netdev_start_xmit include/linux/netdevice.h:4039 [inline] netdev_start_xmit include/linux/netdevice.h:4048 [inline] xmit_one net/core/dev.c:3009 [inline] dev_hard_start_xmit+0x186/0x890 net/core/dev.c:3025 sch_direct_xmit+0x25f/0x510 net/sched/sch_generic.c:186 __dev_xmit_skb net/core/dev.c:3218 [inline] __dev_queue_xmit+0x1b6e/0x25c0 net/core/dev.c:3493 neigh_resolve_output net/core/neighbour.c:1369 [inline] neigh_resolve_output+0x50a/0x8b0 net/core/neighbour.c:1349 neigh_output include/net/neighbour.h:500 [inline] ip6_finish_output2+0x992/0x2150 net/ipv6/ip6_output.c:120 ip6_finish_output+0x4d9/0xaf0 net/ipv6/ip6_output.c:154 NF_HOOK_COND include/linux/netfilter.h:239 [inline] ip6_output+0x1c9/0x650 net/ipv6/ip6_output.c:171 dst_output include/net/dst.h:462 [inline] NF_HOOK include/linux/netfilter.h:250 [inline] ndisc_send_skb+0xb56/0x11e0 net/ipv6/ndisc.c:483 ndisc_send_rs+0x125/0x630 net/ipv6/ndisc.c:677 addrconf_rs_timer+0x289/0x5a0 net/ipv6/addrconf.c:3765 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:qlist_free_all+0x2f/0x140 mm/kasan/quarantine.c:164 RSP: 0018:ffff8880475e7c68 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000000 RBX: ffff888091596cc0 RCX: ffffea000246f29f RDX: 0000000000000000 RSI: ffffffff8129bb13 RDI: ffff888091596cc0 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888091596cc0 R13: ffff8880475e7ca0 R14: ffff88812fe56c40 R15: 0000000000000282 quarantine_reduce+0x140/0x170 mm/kasan/quarantine.c:259 kasan_kmalloc+0x95/0xe0 mm/kasan/kasan.c:536 kmem_cache_alloc+0x127/0x770 mm/slab.c:3552 __d_alloc+0x2a/0x9b0 fs/dcache.c:1623 sock_alloc_file+0xc8/0x2e0 net/socket.c:409 sock_map_fd+0x2e/0x70 net/socket.c:439 SYSC_socket net/socket.c:1349 [inline] SyS_socket+0xf0/0x170 net/socket.c:1325 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45c889 RSP: 002b:00007f1170b7ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 00007f1170b7b6d4 RCX: 000000000045c889 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000010 RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000b8a R14: 00000000004cdc06 R15: 000000000076bf0c rcu_preempt kthread starved for 10502 jiffies! g1911 c1910 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=1 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