audit: type=1800 audit(1591039970.836:198): pid=8742 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="syz-executor.3" name="file0" dev="sda1" ino=16032 res=0 rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: (detected by 1, t=10502 jiffies, g=112077, q=986) rcu: All QSes seen, last rcu_preempt kthread activity 10500 (4295048077-4295037577), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor.1 R running task 27392 8235 6582 0x80000008 Call Trace: sched_show_task.cold+0x334/0x395 kernel/sched/core.c:5338 print_other_cpu_stall kernel/rcu/tree.c:1430 [inline] check_cpu_stall kernel/rcu/tree.c:1557 [inline] __rcu_pending kernel/rcu/tree.c:3293 [inline] rcu_pending kernel/rcu/tree.c:3336 [inline] rcu_check_callbacks.cold+0xaf0/0xddc kernel/rcu/tree.c:2682 update_process_times+0x2a/0x70 kernel/time/timer.c:1638 tick_sched_handle.isra.0+0x91/0x180 kernel/time/tick-sched.c:168 tick_sched_timer+0x44/0x130 kernel/time/tick-sched.c:1278 __run_hrtimer kernel/time/hrtimer.c:1401 [inline] __hrtimer_run_queues+0x2ec/0xd20 kernel/time/hrtimer.c:1463 hrtimer_interrupt+0x312/0x770 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:deref_stack_reg arch/x86/kernel/unwind_orc.c:341 [inline] RIP: 0010:deref_stack_reg+0xbd/0xe0 arch/x86/kernel/unwind_orc.c:335 Code: 83 c4 60 5b 5d 41 5c 41 5d c3 48 8d 74 24 20 48 89 ef e8 46 ff ff ff 4c 89 e0 48 8b 6c 24 20 48 c1 e8 03 42 80 3c 28 00 75 11 <49> 89 2c 24 41 b8 01 00 00 00 eb a4 e8 22 99 0e 00 4c 89 e7 e8 1a RSP: 0018:ffff8880ae7076e0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 1ffff11015ce0f11 RBX: 1ffff11015ce0edc RCX: 1ffff11015ce0f0a RDX: ffff8880ae707b08 RSI: ffff8880ae707700 RDI: ffff8880ae707b00 RBP: ffffffff819ce68c R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000024398 R11: 0000000000064061 R12: ffff8880ae707888 R13: dffffc0000000000 R14: ffff8880ae707878 R15: ffff8880ae707840 unwind_next_frame+0xe87/0x1b10 arch/x86/kernel/unwind_orc.c:506 __save_stack_trace+0x83/0x100 arch/x86/kernel/stacktrace.c:44 save_stack mm/kasan/kasan.c:448 [inline] set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc.part.0+0x4f/0xd0 mm/kasan/kasan.c:553 __do_kmalloc_node mm/slab.c:3689 [inline] __kmalloc_node_track_caller+0x4c/0x70 mm/slab.c:3703 __kmalloc_reserve.isra.0+0x39/0xe0 net/core/skbuff.c:137 __alloc_skb+0xef/0x5b0 net/core/skbuff.c:205 alloc_skb include/linux/skbuff.h:995 [inline] mrp_pdu_init net/802/mrp.c:303 [inline] mrp_pdu_append_vecattr_event+0x76d/0xf60 net/802/mrp.c:402 mrp_attr_event+0x15d/0x220 net/802/mrp.c:497 mrp_mad_event+0x47/0x60 net/802/mrp.c:577 mrp_join_timer+0x33/0x78 net/802/mrp.c:594 call_timer_fn+0x177/0x700 kernel/time/timer.c:1326 expire_timers+0x24f/0x4f0 kernel/time/timer.c:1363 __run_timers kernel/time/timer.c:1684 [inline] run_timer_softirq+0x218/0x660 kernel/time/timer.c:1697 __do_softirq+0x26c/0x93d kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x17b/0x1c0 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:debug_lockdep_rcu_enabled.part.0+0x26/0x50 kernel/rcu/update.c:254 Code: fe ff ff 90 48 b8 00 00 00 00 00 fc ff df 53 65 48 8b 1c 25 40 ee 01 00 48 8d bb 84 08 00 00 48 89 fa 48 c1 ea 03 0f b6 14 02 <48> 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 0f 8b 93 84 08 00 RSP: 0018:ffff88808d2976e8 EFLAGS: 00000a03 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: ffff88808db9a380 RCX: 1ffffffff11f89b8 RDX: 0000000000000000 RSI: ffffffff8194c1d1 RDI: ffff88808db9ac04 RBP: ffffea00029f6580 R08: ffff88808db9a380 R09: fffff9400053ecb7 R10: fffff9400053ecb6 R11: ffffea00029f65b3 R12: 0000000000000000 R13: dead000000000100 R14: dead000000000100 R15: dead000000000100 rcu_read_unlock include/linux/rcupdate.h:677 [inline] __unlock_page_memcg+0x42/0x100 mm/memcontrol.c:1955 page_remove_file_rmap mm/rmap.c:1249 [inline] page_remove_rmap+0x579/0x12e0 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+0x147e/0x2db0 mm/memory.c:1511 unmap_single_vma+0x196/0x300 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/0x420 kernel/fork.c:1036 exit_mm kernel/exit.c:546 [inline] do_exit+0xac4/0x2f00 kernel/exit.c:867 do_group_exit+0x125/0x310 kernel/exit.c:983 get_signal+0x3f5/0x1f30 kernel/signal.c:2588 do_signal+0x8f/0x1620 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: 0033:0x45ca69 Code: Bad RIP value. RSP: 002b:00007f101d8b0cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000078bf08 RCX: 000000000045ca69 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000078bf08 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c R13: 00007fff6e46058f R14: 00007f101d8b19c0 R15: 000000000078bf0c rcu: rcu_preempt kthread starved for 10500 jiffies! g112077 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29104 10 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x8a2/0x1fc0 kernel/sched/core.c:3515 schedule+0x8d/0x1b0 kernel/sched/core.c:3559 schedule_timeout+0x4c1/0xed0 kernel/time/timer.c:1806 rcu_gp_kthread+0xf94/0x2050 kernel/rcu/tree.c:2202 kthread+0x30b/0x410 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415