rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (10376 ticks this GP) idle=6d6/1/0x4000000000000000 softirq=26626/26628 fqs=4888 (t=10500 jiffies g=37549 q=1321) NMI backtrace for cpu 0 CPU: 0 PID: 16141 Comm: syz-executor.3 Not tainted 5.11.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x1e3/0x21e kernel/rcu/tree_stall.h:337 print_cpu_stall kernel/rcu/tree_stall.h:569 [inline] check_cpu_stall kernel/rcu/tree_stall.h:643 [inline] rcu_pending kernel/rcu/tree.c:3751 [inline] rcu_sched_clock_irq.cold+0x472/0xec3 kernel/rcu/tree.c:2580 update_process_times+0x16d/0x200 kernel/time/timer.c:1782 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1369 __run_hrtimer kernel/time/hrtimer.c:1519 [inline] __hrtimer_run_queues+0x1ce/0xea0 kernel/time/hrtimer.c:1583 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1085 [inline] __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1102 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:91 [inline] sysvec_apic_timer_interrupt+0x48/0x100 arch/x86/kernel/apic/apic.c:1096 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628 RIP: 0010:orc_ip arch/x86/kernel/unwind_orc.c:30 [inline] RIP: 0010:__orc_find+0x6f/0xf0 arch/x86/kernel/unwind_orc.c:52 Code: 72 4d 4c 89 e0 48 29 e8 48 89 c2 48 c1 e8 3f 48 c1 fa 02 48 01 d0 48 d1 f8 48 8d 5c 85 00 48 89 d8 48 c1 e8 03 42 0f b6 14 38 <48> 89 d8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 48 48 63 03 48 01 RSP: 0018:ffffc90000007538 EFLAGS: 00000216 RAX: 1ffffffff1a9e64b RBX: ffffffff8d4f3258 RCX: ffffffff87ac7b2d RDX: 0000000000000000 RSI: ffffffff8de310d2 RDI: ffffffff8d4f3248 RBP: ffffffff8d4f3248 R08: ffffffff8de31108 R09: ffffffff8de310d2 R10: 0000000000082083 R11: 000000000015b409 R12: ffffffff8d4f3268 R13: ffffffff8d4f3248 R14: ffffffff8d4f3248 R15: dffffc0000000000 orc_find arch/x86/kernel/unwind_orc.c:173 [inline] unwind_next_frame+0x342/0x1f90 arch/x86/kernel/unwind_orc.c:443 arch_stack_walk+0x7d/0xe0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:121 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:401 [inline] ____kasan_kmalloc.constprop.0+0x82/0xa0 mm/kasan/common.c:429 kasan_slab_alloc include/linux/kasan.h:205 [inline] slab_post_alloc_hook mm/slab.h:512 [inline] slab_alloc_node mm/slub.c:2892 [inline] slab_alloc mm/slub.c:2900 [inline] kmem_cache_alloc_trace+0x1be/0x360 mm/slub.c:2917 kmalloc include/linux/slab.h:552 [inline] dst_cow_metrics_generic+0x48/0x1e0 net/core/dst.c:201 dst_metrics_write_ptr include/net/dst.h:117 [inline] dst_metric_set include/net/dst.h:178 [inline] icmp6_dst_alloc+0x4f5/0x6c0 net/ipv6/route.c:3180 ndisc_send_skb+0x1207/0x1720 net/ipv6/ndisc.c:488 ndisc_send_rs+0x12e/0x700 net/ipv6/ndisc.c:702 addrconf_rs_timer+0x3f2/0x820 net/ipv6/addrconf.c:3874 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1417 expire_timers kernel/time/timer.c:1462 [inline] __run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1731 __run_timers kernel/time/timer.c:1712 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1744 __do_softirq+0x2a5/0x9f7 kernel/softirq.c:343 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:226 [inline] __irq_exit_rcu kernel/softirq.c:420 [inline] irq_exit_rcu+0x134/0x200 kernel/softirq.c:432 sysvec_irq_work+0x4d/0x100 arch/x86/kernel/irq_work.c:17 asm_sysvec_irq_work+0x12/0x20 arch/x86/include/asm/idtentry.h:654 RIP: 0010:call_rcu+0x2e7/0x700 kernel/rcu/tree.c:3039 Code: 3c 02 00 0f 85 bb 03 00 00 48 8b 05 c3 f6 d6 09 49 03 84 24 f0 00 00 00 49 39 c7 0f 8f 65 01 00 00 e8 2d 83 18 00 ff 34 24 9d <48> 83 c4 20 5b 5d 41 5c 41 5d 41 5e 41 5f c3 80 3c 02 00 0f 84 2f RSP: 0018:ffffc900094ffba8 EFLAGS: 00000246 RAX: 0000000000ff807b RBX: ffff88801786e778 RCX: ffffffff81580937 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffff8880b9e35b70 R08: 0000000000000001 R09: ffffffff8ebd9917 R10: fffffbfff1d7b322 R11: 0000000000000000 R12: ffff8880b9e35a80 R13: ffff8880b9e35b60 R14: ffff8880b9e35b18 R15: 0000000000000062 put_task_struct_rcu_user+0x7f/0xb0 kernel/exit.c:178 context_switch kernel/sched/core.c:4316 [inline] __schedule+0x914/0x21a0 kernel/sched/core.c:5064 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:5224 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:40 __raw_spin_unlock include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock+0x36/0x40 kernel/locking/spinlock.c:183 spin_unlock include/linux/spinlock.h:394 [inline] fasync_insert_entry+0x22b/0x2b0 fs/fcntl.c:945 fasync_add_entry fs/fcntl.c:968 [inline] fasync_helper+0x5f/0xb0 fs/fcntl.c:986 perf_fasync+0x7e/0xb0 kernel/events/core.c:6237 setfl fs/fcntl.c:73 [inline] do_fcntl+0x667/0x1070 fs/fcntl.c:347 __do_sys_fcntl fs/fcntl.c:463 [inline] __se_sys_fcntl fs/fcntl.c:448 [inline] __x64_sys_fcntl+0x165/0x1e0 fs/fcntl.c:448 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e299 Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f9f85c2fc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000048 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e299 RDX: 0000000000042000 RSI: 0000000000000004 RDI: 0000000000000004 RBP: 000000000119bfc0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffd9263b4df R14: 00007f9f85c309c0 R15: 000000000119bf8c