netlink: 24 bytes leftover after parsing attributes in process `syz-executor.4'. rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-...!: (1 GPs behind) idle=eae/1/0x4000000000000004 softirq=146649/146650 fqs=2 rcu: (t=10501 jiffies g=239981 q=98) rcu: rcu_preempt kthread starved for 10498 jiffies! g239981 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29728 10 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 schedule_timeout+0x4cf/0xfe0 kernel/time/timer.c:1817 rcu_gp_kthread+0xdad/0x21c0 kernel/rcu/tree.c:2202 kthread+0x30b/0x410 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 NMI backtrace for cpu 0 CPU: 0 PID: 18466 Comm: syz-executor.5 Not tainted 4.19.134-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2fe lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1eb lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x15f/0x19c kernel/rcu/tree.c:1340 print_cpu_stall kernel/rcu/tree.c:1478 [inline] check_cpu_stall kernel/rcu/tree.c:1550 [inline] __rcu_pending kernel/rcu/tree.c:3293 [inline] rcu_pending kernel/rcu/tree.c:3336 [inline] rcu_check_callbacks.cold+0x62d/0xe19 kernel/rcu/tree.c:2682 update_process_times+0x2a/0x70 kernel/time/timer.c:1649 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:168 tick_sched_timer+0xfc/0x290 kernel/time/tick-sched.c:1278 __run_hrtimer kernel/time/hrtimer.c:1401 [inline] __hrtimer_run_queues+0x3f6/0xe60 kernel/time/hrtimer.c:1463 hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1521 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1067 [inline] smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1092 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xa3/0xe0 kernel/locking/spinlock.c:184 Code: 48 c7 c0 48 5b d2 88 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 2f 48 83 3d cc a6 97 01 00 74 15 48 89 df 57 9d <0f> 1f 44 00 00 eb b2 e8 6a aa c5 f9 eb c0 0f 0b 0f 0b 48 c7 c7 48 RSP: 0018:ffff8880ae607c18 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff11a4b69 RBX: 0000000000000282 RCX: 1ffff11005217992 RDX: dffffc0000000000 RSI: ffff8880290bcc70 RDI: 0000000000000282 RBP: ffff8880ae623a40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000023a40 R14: 0000000000000000 R15: ffff8880ae623a40 __mod_timer kernel/time/timer.c:1070 [inline] mod_timer+0x4ea/0x1010 kernel/time/timer.c:1113 call_timer_fn+0x177/0x700 kernel/time/timer.c:1337 expire_timers+0x243/0x4e0 kernel/time/timer.c:1374 __run_timers kernel/time/timer.c:1695 [inline] run_timer_softirq+0x21c/0x670 kernel/time/timer.c:1708 __do_softirq+0x26c/0x9a0 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x215/0x260 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:544 [inline] smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1094 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:save_stack_address arch/x86/kernel/stacktrace.c:29 [inline] RIP: 0010:save_stack_address arch/x86/kernel/stacktrace.c:15 [inline] RIP: 0010:__save_stack_trace+0x86/0x190 arch/x86/kernel/stacktrace.c:46 Code: 3c 24 48 89 1c c1 48 8b 8a 98 00 00 00 48 8d 7d 80 e8 6e 37 07 00 8b 55 80 85 d2 75 2d eb 62 41 8b 04 24 41 3b 44 24 04 73 76 <49> 8b 54 24 08 8d 48 01 41 89 0c 24 48 89 1c c2 48 8d 7d 80 e8 e1 RSP: 0018:ffff88820f46f5e8 EFLAGS: 00000287 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: ffffffff819f71f6 RCX: 0000000000000000 RDX: 1ffff11041e8dec8 RSI: ffff88820f46f4a0 RDI: ffffffff819f71f6 RBP: ffff88820f46f678 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000066061 R11: 0000000000000001 R12: ffff88820f46f690 R13: 0000000000000000 R14: ffff88821b685cc0 R15: 00000000000000e8 save_stack mm/kasan/kasan.c:448 [inline] set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:553 kmem_cache_alloc_node+0x146/0x3b0 mm/slab.c:3649 __alloc_skb+0x71/0x560 net/core/skbuff.c:193 alloc_skb include/linux/skbuff.h:995 [inline] sock_wmalloc+0xd0/0x120 net/core/sock.c:1942 pppoe_sendmsg+0x2ac/0x710 drivers/net/ppp/pppoe.c:874 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:632 ___sys_sendmsg+0x3b3/0x8e0 net/socket.c:2115 __sys_sendmmsg+0x195/0x470 net/socket.c:2210 __do_sys_sendmmsg net/socket.c:2239 [inline] __se_sys_sendmmsg net/socket.c:2236 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2236 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c1f9 Code: 8d b6 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 5b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f0f3ea14c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00000000000260c0 RCX: 000000000045c1f9 RDX: 04000000000000eb RSI: 000000002000d180 RDI: 0000000000000004 RBP: 000000000078bf48 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c R13: 00007ffcb350247f R14: 00007f0f3ea159c0 R15: 000000000078bf0c device vlan1220 entered promiscuous mode