rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-...!: (10500 ticks this GP) idle=67e/1/0x4000000000000004 softirq=59183/59183 fqs=15 (t=10500 jiffies g=70677 q=277) rcu: rcu_preempt kthread starved for 10466 jiffies! g70677 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29016 10 2 0x80004000 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x87f/0xcd0 kernel/sched/core.c:4081 schedule+0x188/0x210 kernel/sched/core.c:4155 schedule_timeout+0x14f/0x240 kernel/time/timer.c:1895 rcu_gp_fqs_loop kernel/rcu/tree.c:1661 [inline] rcu_gp_kthread+0xe0d/0x1770 kernel/rcu/tree.c:1821 kthread+0x332/0x350 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 NMI backtrace for cpu 0 CPU: 0 PID: 24420 Comm: syz-executor.3 Not tainted 5.5.0-rc6-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+0x1fb/0x318 lib/dump_stack.c:118 nmi_cpu_backtrace+0xaa/0x190 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x16f/0x290 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x10/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x15a/0x220 kernel/rcu/tree_stall.h:254 print_cpu_stall kernel/rcu/tree_stall.h:455 [inline] check_cpu_stall kernel/rcu/tree_stall.h:529 [inline] rcu_pending kernel/rcu/tree.c:2827 [inline] rcu_sched_clock_irq+0x1521/0x1ab0 kernel/rcu/tree.c:2271 update_process_times+0x12d/0x180 kernel/time/timer.c:1726 tick_sched_handle kernel/time/tick-sched.c:171 [inline] tick_sched_timer+0x263/0x420 kernel/time/tick-sched.c:1314 __run_hrtimer kernel/time/hrtimer.c:1517 [inline] __hrtimer_run_queues+0x3f3/0x840 kernel/time/hrtimer.c:1579 hrtimer_interrupt+0x37c/0xda0 kernel/time/hrtimer.c:1641 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline] smp_apic_timer_interrupt+0x109/0x280 arch/x86/kernel/apic/apic.c:1135 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:752 [inline] RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xa8/0xe0 kernel/locking/spinlock.c:191 Code: b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 0c 48 c7 c7 28 91 0a 89 e8 07 bb b5 f9 48 83 3d e7 8b 0d 01 00 74 2d 4c 89 f7 57 9d <0f> 1f 44 00 00 bf 01 00 00 00 e8 b9 dd 55 f9 65 8b 05 6e 18 05 78 RSP: 0018:ffffc90000007c30 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff1215225 RBX: ffff8880aec27080 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000282 RBP: ffffc90000007c40 R08: ffff8880a9412dd8 R09: fffffbfff13cd135 R10: fffffbfff13cd135 R11: 0000000000000000 R12: ffff8880aec27080 R13: ffff888036ac8c20 R14: 0000000000000282 R15: 0000000000000000 __mod_timer+0xeec/0x1570 kernel/time/timer.c:1057 mod_timer+0x1f/0x30 kernel/time/timer.c:1100 mrp_join_timer_arm net/802/mrp.c:583 [inline] mrp_join_timer+0x121/0x130 net/802/mrp.c:596 call_timer_fn+0x95/0x170 kernel/time/timer.c:1404 expire_timers kernel/time/timer.c:1449 [inline] __run_timers+0x776/0x970 kernel/time/timer.c:1773 run_timer_softirq+0x4a/0x90 kernel/time/timer.c:1786 __do_softirq+0x283/0x7bd arch/x86/include/asm/paravirt.h:762 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x227/0x230 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x113/0x280 arch/x86/kernel/apic/apic.c:1137 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:__read_once_size include/linux/compiler.h:199 [inline] RIP: 0010:should_fail+0xfe/0x770 lib/fault-inject.c:106 Code: e8 07 5f c1 fd 31 c0 e9 dd 03 00 00 4c 89 f8 65 4c 8b 3c 25 c0 1d 02 00 49 81 c7 44 13 00 00 4d 89 fc 49 c1 ec 03 41 8a 04 04 <84> c0 0f 85 2b 05 00 00 41 8b 1f 31 ff 89 de e8 7e 62 c1 fd 85 db RSP: 0018:ffffc9000819f9c0 EFLAGS: 00000a07 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000002 RDX: ffffc900112dc000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc9000819fa10 R08: ffffffff83b51ddf R09: fffffbfff12891fd R10: fffffbfff12891fd R11: 0000000000000000 R12: 1ffff11015282718 R13: ffffffff89101038 R14: 00000000000001c8 R15: ffff8880a94138c4 __should_failslab+0x11a/0x160 mm/failslab.c:33 should_failslab+0x9/0x20 mm/slab_common.c:1811 slab_pre_alloc_hook mm/slab.h:567 [inline] slab_alloc mm/slab.c:3306 [inline] kmem_cache_alloc+0x56/0x2e0 mm/slab.c:3484 kmem_cache_zalloc include/linux/slab.h:660 [inline] __alloc_file+0x2c/0x390 fs/file_table.c:101 alloc_empty_file+0xac/0x1b0 fs/file_table.c:151 path_openat+0x9e/0x4250 fs/namei.c:3462 do_filp_open+0x192/0x3d0 fs/namei.c:3503 do_sys_open+0x29f/0x560 fs/open.c:1097 __do_sys_open fs/open.c:1115 [inline] __se_sys_open fs/open.c:1110 [inline] __x64_sys_open+0x87/0x90 fs/open.c:1110 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4150e1 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:00007f4604dec7a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 00000000004150e1 RDX: 0000000000000000 RSI: 0000000000000045 RDI: 00007f4604dec850 RBP: 000000000075bfc8 R08: 000000000000000f R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00000000ffffffff R13: 0000000000000ba1 R14: 00000000004cc8b5 R15: 000000000075bfd4