aoe: skb alloc failure aoe: skb alloc failure aoe: skb alloc failure aoe: skb alloc failure aoe: skb alloc failure rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (1 GPs behind) idle=14e/1/0x4000000000000004 softirq=283976/283977 fqs=3 rcu: (t=10500 jiffies g=434785 q=83) rcu: rcu_preempt kthread starved for 9891 jiffies! g434785 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29208 10 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3515 schedule+0x8d/0x1b0 kernel/sched/core.c:3559 schedule_timeout+0x4d8/0xef0 kernel/time/timer.c:1806 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 1 CPU: 1 PID: 21324 Comm: syz-executor.2 Not tainted 4.19.131-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:1638 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:__kernel_text_address+0x1/0x30 kernel/extable.c:106 Code: 89 ef e8 d2 19 2f 00 0f b6 c0 eb cf 48 c7 c7 c4 6a ad 89 e8 71 7a 5a 00 e9 64 ff ff ff 66 90 66 2e 0f 1f 84 00 00 00 00 00 53 <48> 89 fb e8 07 ff ff ff 85 c0 75 17 48 81 fb 00 e0 a0 8a 72 0c 31 RSP: 0018:ffff8880ae707870 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: ffff8880ae7078a8 RCX: ffff8880ae707930 RDX: 1ffff11015ce0f1e RSI: ffff8880ae707698 RDI: ffffffff819fb57b RBP: ffff8880ae7078f0 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000066061 R11: 0000000000000001 R12: ffff8880ae707940 R13: 0000000000000000 R14: ffff88821b685cc0 R15: 00000000000000e8 unwind_get_return_address arch/x86/kernel/unwind_orc.c:297 [inline] unwind_get_return_address+0x51/0x90 arch/x86/kernel/unwind_orc.c:292 __save_stack_trace+0xaf/0x190 arch/x86/kernel/stacktrace.c:45 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 slab_post_alloc_hook mm/slab.h:445 [inline] slab_alloc_node mm/slab.c:3340 [inline] kmem_cache_alloc_node+0x133/0x3b0 mm/slab.c:3647 __alloc_skb+0x71/0x560 net/core/skbuff.c:193 alloc_skb include/linux/skbuff.h:995 [inline] mrp_pdu_init net/802/mrp.c:303 [inline] mrp_pdu_append_vecattr_event+0x7d2/0x1050 net/802/mrp.c:402 mrp_attr_event+0x15d/0x220 net/802/mrp.c:497 mrp_mad_event net/802/mrp.c:577 [inline] mrp_join_timer+0x5a/0xc0 net/802/mrp.c:594 call_timer_fn+0x177/0x700 kernel/time/timer.c:1326 expire_timers+0x243/0x4e0 kernel/time/timer.c:1363 __run_timers kernel/time/timer.c:1684 [inline] run_timer_softirq+0x21c/0x670 kernel/time/timer.c:1697 __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:__sanitizer_cov_trace_pc+0x0/0x50 kernel/kcov.c:97 Code: 48 c7 c7 20 34 8e 87 4c 89 25 1c a5 26 0a 41 bc f4 ff ff ff e8 50 13 eb ff 48 c7 05 06 a5 26 0a 00 00 00 00 e9 39 ec ff ff 90 <48> 8b 34 24 65 48 8b 04 25 40 ee 01 00 65 8b 15 7c 45 98 7e 81 e2 RSP: 0018:ffff8881e85ef730 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8197889a RDX: 0000000000000000 RSI: ffff888205236400 RDI: 0000000000000001 RBP: ffffea00025530c0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: dead000000000100 R15: 00007f1e468ef000 page_remove_rmap+0xda/0x120 mm/rmap.c:1300 zap_pte_range mm/memory.c:1338 [inline] zap_pmd_range mm/memory.c:1440 [inline] zap_pud_range mm/memory.c:1469 [inline] zap_p4d_range mm/memory.c:1490 [inline] unmap_page_range+0x12f6/0x2a70 mm/memory.c:1511 unmap_single_vma+0x198/0x300 mm/memory.c:1556 unmap_vmas+0xa9/0x180 mm/memory.c:1586 exit_mmap+0x2b9/0x510 mm/mmap.c:3091 __mmput kernel/fork.c:1015 [inline] mmput+0x14e/0x4a0 kernel/fork.c:1036 exit_mm kernel/exit.c:546 [inline] do_exit+0xab5/0x2b70 kernel/exit.c:874 do_group_exit+0x125/0x310 kernel/exit.c:990 get_signal+0x3f2/0x1f70 kernel/signal.c:2588 do_signal+0x8f/0x1670 arch/x86/kernel/signal.c:821 exit_to_usermode_loop+0x204/0x2a0 arch/x86/entry/common.c:163 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x416921 Code: 75 14 b8 02 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 19 00 00 c3 48 83 ec 08 e8 0a fa ff ff 48 89 04 24 b8 02 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fa ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007f1e466bbbb0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: 0000000000000004 RBX: 000000000050b020 RCX: 0000000000416921 RDX: 00007f1e466bbbe1 RSI: 0000000000000002 RDI: 00007f1e466bbbd0 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000011 R10: 0000000000000006 R11: 0000000000000293 R12: 00000000ffffffff R13: 0000000000000c67 R14: 00000000004cec55 R15: 00007f1e466bc6d4