INFO: rcu_sched detected stalls on CPUs/tasks: (detected by 0, t=10502 jiffies, g=11984, c=11983, q=3) All QSes seen, last rcu_sched kthread activity 8288 (4295032840-4295024552), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor.1 R running task 26528 32248 6337 0x00000004 Call Trace: sched_show_task kernel/sched/core.c:5168 [inline] sched_show_task.cold+0x335/0x399 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.isra.0+0x73/0x150 kernel/time/tick-sched.c:165 tick_sched_timer+0x41/0x120 kernel/time/tick-sched.c:1223 __run_hrtimer kernel/time/hrtimer.c:1223 [inline] __hrtimer_run_queues+0x24b/0xb90 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+0x117/0x5f0 arch/x86/kernel/apic/apic.c:1100 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793 RIP: 0010:__read_once_size_nocheck.constprop.0+0x3/0x10 include/linux/compiler.h:201 RSP: 0018:ffff8880aec075e8 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff10 RAX: ffffffff8183f1c0 RBX: 1ffff11015d80ebe RCX: 1ffff11015d80ee3 RDX: ffff888203447430 RSI: ffff8880aec07610 RDI: ffff888203447428 RBP: ffff888203447428 R08: 0000000000000000 R09: 0000000000000001 R10: 00000000000201d8 R11: 0000000000056071 R12: ffff8880aec07750 R13: dffffc0000000000 R14: ffff8880aec07758 R15: ffff8880aec07708 deref_stack_reg arch/x86/kernel/unwind_orc.c:296 [inline] deref_stack_reg+0x8a/0xc0 arch/x86/kernel/unwind_orc.c:290 unwind_next_frame+0xc7b/0x1700 arch/x86/kernel/unwind_orc.c:429 __save_stack_trace+0x6b/0xd0 arch/x86/kernel/stacktrace.c:44 save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc.part.0+0x4f/0xd0 mm/kasan/kasan.c:551 slab_post_alloc_hook mm/slab.h:442 [inline] slab_alloc mm/slab.c:3390 [inline] kmem_cache_alloc+0x111/0x3c0 mm/slab.c:3550 dst_alloc+0xe4/0x170 net/core/dst.c:107 __ip6_dst_alloc+0x2e/0x50 net/ipv6/route.c:357 ip6_dst_alloc+0x2a/0x1d0 net/ipv6/route.c:370 icmp6_dst_alloc+0x155/0x580 net/ipv6/route.c:1768 ndisc_send_skb+0xcff/0x1390 net/ipv6/ndisc.c:463 ndisc_send_rs+0x125/0x630 net/ipv6/ndisc.c:677 addrconf_rs_timer+0x280/0x5a0 net/ipv6/addrconf.c:3765 call_timer_fn+0x14a/0x650 kernel/time/timer.c:1279 expire_timers+0x233/0x4d0 kernel/time/timer.c:1318 __run_timers kernel/time/timer.c:1636 [inline] run_timer_softirq+0x1d8/0x5b0 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+0x141/0x5f0 arch/x86/kernel/apic/apic.c:1102 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793 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+0xd2/0x110 mm/kasan/quarantine.c:166 RSP: 0018:ffff8882034473f8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000007 RBX: ffff8881fc2c8800 RCX: 1ffff11012d18515 RDX: 0000000000000000 RSI: ffff8880968c28b0 RDI: 0000000000000282 RBP: 0000000000000282 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff8881fb81f8c0 R14: ffff888203447430 R15: ffff8880aa800940 quarantine_reduce+0x140/0x170 mm/kasan/quarantine.c:259 kasan_kmalloc+0x95/0xc0 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+0x133/0x400 mm/slab.c:3640 __alloc_skb+0x9a/0x4c0 net/core/skbuff.c:193 alloc_skb include/linux/skbuff.h:980 [inline] sock_wmalloc+0xa5/0xf0 net/core/sock.c:1933 __ip6_append_data.isra.0+0x21c2/0x28d0 net/ipv6/ip6_output.c:1426 ip6_append_data+0x1c3/0x300 net/ipv6/ip6_output.c:1582 rawv6_sendmsg+0x10b8/0x2d50 net/ipv6/raw.c:952 inet_sendmsg+0x116/0x4d0 net/ipv4/af_inet.c:762 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 ___sys_sendmsg+0x349/0x840 net/socket.c:2062 __sys_sendmmsg+0x129/0x330 net/socket.c:2152 SYSC_sendmmsg net/socket.c:2183 [inline] SyS_sendmmsg+0x2f/0x50 net/socket.c:2178 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45ca69 RSP: 002b:00007fac81a6bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00000000004fc5c0 RCX: 000000000045ca69 RDX: 0000000000000066 RSI: 000000002000ac80 RDI: 0000000000000003 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000008dd R14: 00000000004cba5f R15: 00007fac81a6c6d4 rcu_sched kthread starved for 8358 jiffies! g11984 c11983 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0 rcu_sched R running task 29472 9 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x8a6/0x1d70 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_timeout+0x4df/0xe50 kernel/time/timer.c:1746 rcu_gp_kthread+0xb3d/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