9pnet: Insufficient options for proto=fd INFO: rcu_preempt detected stalls on CPUs/tasks: (detected by 1, t=10502 jiffies, g=5958, c=5957, q=308) All QSes seen, last rcu_preempt kthread activity 10503 (4294963551-4294953048), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor.5 R running task 27792 12927 6413 0x00000008 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:orc_ip arch/x86/kernel/unwind_orc.c:27 [inline] RIP: 0010:__orc_find+0x6f/0xf0 arch/x86/kernel/unwind_orc.c:49 RSP: 0018:ffff8880aed077c0 EFLAGS: 00000a07 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff1183760 RBX: ffffffff88c1bb04 RCX: ffffffff86400963 RDX: 0000000000000000 RSI: ffffffff89301f0a RDI: ffffffff88c1babc RBP: ffffffff88c1babc R08: ffffffff89301fe8 R09: ffffffff89301f0a R10: 000000000011d12b R11: 0000000000056071 R12: ffffffff88c1bb4c R13: ffffffff88c1babc R14: ffffffff88c1babc R15: dffffc0000000000 orc_find arch/x86/kernel/unwind_orc.c:118 [inline] unwind_next_frame+0x632/0x1700 arch/x86/kernel/unwind_orc.c:352 __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_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] ndisc_alloc_skb+0x134/0x310 net/ipv6/ndisc.c:402 ndisc_send_rs+0x2ec/0x630 net/ipv6/ndisc.c:661 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:preempt_schedule_irq+0xa6/0x140 kernel/sched/core.c:3611 RSP: 0018:ffff8880a85b78d0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff0f62cd3 RBX: dffffc0000000000 RCX: 1ffff11013c7d5cd RDX: 0000000000000000 RSI: ffff88809e3eae48 RDI: ffff88809e3eae44 RBP: ffffed1013c7d4b8 R08: ffff88821fff705c R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88809e3ea5c0 R13: ffffffff87b16698 R14: 0000000000000000 R15: 0000000000000000 retint_kernel+0x1b/0x2d RIP: 0010:mark_reg_read kernel/bpf/verifier.c:759 [inline] RIP: 0010:check_reg_arg.isra.0+0x15a/0x270 kernel/bpf/verifier.c:781 RSP: 0018:ffff8880a85b79a0 EFLAGS: 00000a02 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000000 RBX: ffff88808998f680 RCX: ffffc9000c3d9000 RDX: 1ffff11011331ed9 RSI: ffffffff81651ab0 RDI: ffff88808998f6c8 RBP: 0000000000000000 R08: ffffed1011b7b98f R09: 0000000000000007 R10: ffffed1011b7b98e R11: ffff88808dbdcc77 R12: 0000000000000000 R13: 0000000000000040 R14: dffffc0000000000 R15: 0000000000000005 do_check+0x3a32/0x9420 kernel/bpf/verifier.c:4340 bpf_check+0xaf3/0x1830 kernel/bpf/verifier.c:5047 bpf_prog_load+0x5e9/0xe00 kernel/bpf/syscall.c:1057 SYSC_bpf kernel/bpf/syscall.c:1512 [inline] SyS_bpf+0x12b2/0x34e0 kernel/bpf/syscall.c:1477 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45ca59 RSP: 002b:00007fc86b60dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00000000004dada0 RCX: 000000000045ca59 RDX: 0000000000000048 RSI: 00000000200054c0 RDI: 0000000000000005 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 000000000000006f R14: 00000000004c334a R15: 00007fc86b60e6d4 rcu_preempt kthread starved for 10561 jiffies! g5958 c5957 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0 rcu_preempt R running task 29904 8 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