rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (1 GPs behind) idle=12d/1/0x4000000000000000 softirq=76633/76634 fqs=7 (t=10500 jiffies g=113489 q=1258) rcu: rcu_preempt kthread starved for 10485 jiffies! g113489 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: task:rcu_preempt state:R running task stack:28344 pid: 14 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4972 [inline] __schedule+0xa9a/0x4900 kernel/sched/core.c:6253 schedule+0xd2/0x260 kernel/sched/core.c:6326 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881 rcu_gp_fqs_loop+0x186/0x810 kernel/rcu/tree.c:1955 rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2128 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 8024 Comm: kworker/u4:25 Not tainted 5.16.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: wg-kex-wg2 wg_packet_handshake_send_worker RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x0/0x70 kernel/kcov.c:286 Code: b7 c9 48 83 c2 01 48 c7 44 30 e0 02 00 00 00 48 89 7c 30 e8 48 89 4c 30 f0 4c 89 54 d8 20 48 89 10 5b c3 0f 1f 80 00 00 00 00 <41> 89 f8 bf 03 00 00 00 4c 8b 14 24 89 f1 65 48 8b 34 25 40 70 02 RSP: 0018:ffffc9000b5bf668 EFLAGS: 00000206 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000 RDX: ffff888031ee8080 RSI: 0000000000000009 RDI: 000000000000000b RBP: 0000000000000001 R08: 0000000000000001 R09: ffffc9000b5bf76f R10: ffffffff87e45df5 R11: 000000007d062000 R12: 0000000000000009 R13: ffffc9000b5bf758 R14: ffff88807d062040 R15: ffffc9000b5bf718 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f893ad10718 CR3: 0000000040eeb000 CR4: 00000000003506f0 Call Trace: __ipv6_dev_get_saddr+0x233/0x5c0 net/ipv6/addrconf.c:1687 ipv6_dev_get_saddr+0x824/0xbc0 net/ipv6/addrconf.c:1826 ip6_route_get_saddr include/net/ip6_route.h:145 [inline] ip6_dst_lookup_tail+0xa6e/0x1620 net/ipv6/ip6_output.c:1075 ip6_dst_lookup_flow+0x8c/0x1d0 net/ipv6/ip6_output.c:1200 send6+0x5f4/0xcc0 drivers/net/wireguard/socket.c:139 wg_socket_send_skb_to_peer+0xf5/0x220 drivers/net/wireguard/socket.c:177 wg_socket_send_buffer_to_peer+0x127/0x170 drivers/net/wireguard/socket.c:199 wg_packet_send_handshake_initiation+0x212/0x340 drivers/net/wireguard/send.c:40 wg_packet_handshake_send_worker+0x18/0x30 drivers/net/wireguard/send.c:51 process_one_work+0x9b2/0x1660 kernel/workqueue.c:2298 worker_thread+0x65d/0x1130 kernel/workqueue.c:2445 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 NMI backtrace for cpu 1 CPU: 1 PID: 31541 Comm: syz-executor.1 Not tainted 5.16.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111 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+0x25e/0x3f0 kernel/rcu/tree_stall.h:343 print_cpu_stall kernel/rcu/tree_stall.h:627 [inline] check_cpu_stall kernel/rcu/tree_stall.h:711 [inline] rcu_pending kernel/rcu/tree.c:3878 [inline] rcu_sched_clock_irq.cold+0x5c/0x759 kernel/rcu/tree.c:2597 update_process_times+0x16d/0x200 kernel/time/timer.c:1785 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1428 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline] __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103 sysvec_apic_timer_interrupt+0x40/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:lock_acquire+0x1ef/0x510 kernel/locking/lockdep.c:5605 Code: 96 a6 7e 83 f8 01 0f 85 b4 02 00 00 9c 58 f6 c4 02 0f 85 9f 02 00 00 48 83 7c 24 08 00 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24 RSP: 0018:ffffc90000fd8c08 EFLAGS: 00000206 RAX: dffffc0000000000 RBX: 1ffff920001fb183 RCX: 000000000000ebb3 RDX: 1ffff110029bb183 RSI: 0000000000000101 RDI: 0000000000000000 RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8ff7aaef R10: fffffbfff1fef55d R11: 0000000000000001 R12: 0000000000000000 R13: 0000000000000000 R14: ffff888095e66078 R15: 0000000000000000 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:349 [inline] garp_join_timer+0x20/0xf0 net/802/garp.c:418 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421 expire_timers kernel/time/timer.c:1466 [inline] __run_timers.part.0+0x67c/0xa30 kernel/time/timer.c:1734 __run_timers kernel/time/timer.c:1715 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:qlist_free_all+0x67/0x110 mm/kasan/quarantine.c:160 Code: 07 bd 81 48 c1 e8 03 42 c6 04 28 fb e8 d2 7a ff ff 48 85 db 75 52 9c 58 f6 c4 02 0f 85 a4 00 00 00 48 85 db 74 01 fb 48 85 ed <74> 73 48 89 ee 4d 85 e4 4c 89 e7 74 38 48 63 87 80 00 00 00 48 8b RSP: 0018:ffffc9001139f510 EFLAGS: 00000282 RAX: 0000000000000006 RBX: 0000000000000200 RCX: 1ffffffff1b21e01 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff888019616840 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff817d08b8 R11: 000000000000003f R12: 0000000000000000 R13: dffffc0000000000 R14: ffffc9001139f558 R15: ffffea0000000000 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:272 __kasan_slab_alloc+0x97/0xb0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:259 [inline] slab_post_alloc_hook mm/slab.h:519 [inline] slab_alloc_node mm/slab.c:3261 [inline] kmem_cache_alloc_node_trace+0x2ff/0x5b0 mm/slab.c:3617 __do_kmalloc_node mm/slab.c:3639 [inline] __kmalloc_node+0x38/0x60 mm/slab.c:3647 kmalloc_node include/linux/slab.h:613 [inline] __vmalloc_area_node mm/vmalloc.c:2940 [inline] __vmalloc_node_range+0x470/0xab0 mm/vmalloc.c:3065 __vmalloc_node mm/vmalloc.c:3114 [inline] vmalloc+0x67/0x80 mm/vmalloc.c:3147 bpf_prog_calc_tag+0xc9/0x6e0 kernel/bpf/core.c:279 resolve_pseudo_ldimm64 kernel/bpf/verifier.c:11733 [inline] bpf_check+0x21b3/0xca20 kernel/bpf/verifier.c:14016 bpf_prog_load+0xf52/0x21e0 kernel/bpf/syscall.c:2343 __sys_bpf+0x674/0x5950 kernel/bpf/syscall.c:4633 __do_sys_bpf kernel/bpf/syscall.c:4737 [inline] __se_sys_bpf kernel/bpf/syscall.c:4735 [inline] __x64_sys_bpf+0x75/0xb0 kernel/bpf/syscall.c:4735 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f2cde697e99 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2cdd00d168 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f2cde7aaf60 RCX: 00007f2cde697e99 RDX: 0000000000000070 RSI: 0000000020000440 RDI: 0000000000000005 RBP: 00007f2cde6f1ff1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffeecd4392f R14: 00007f2cdd00d300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: b7 c9 mov $0xc9,%bh 2: 48 83 c2 01 add $0x1,%rdx 6: 48 c7 44 30 e0 02 00 movq $0x2,-0x20(%rax,%rsi,1) d: 00 00 f: 48 89 7c 30 e8 mov %rdi,-0x18(%rax,%rsi,1) 14: 48 89 4c 30 f0 mov %rcx,-0x10(%rax,%rsi,1) 19: 4c 89 54 d8 20 mov %r10,0x20(%rax,%rbx,8) 1e: 48 89 10 mov %rdx,(%rax) 21: 5b pop %rbx 22: c3 retq 23: 0f 1f 80 00 00 00 00 nopl 0x0(%rax) * 2a: 41 89 f8 mov %edi,%r8d <-- trapping instruction 2d: bf 03 00 00 00 mov $0x3,%edi 32: 4c 8b 14 24 mov (%rsp),%r10 36: 89 f1 mov %esi,%ecx 38: 65 gs 39: 48 rex.W 3a: 8b .byte 0x8b 3b: 34 25 xor $0x25,%al 3d: 40 70 02 rex jo 0x42