rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (1 GPs behind) idle=da2/1/0x4000000000000000 softirq=78946/78947 fqs=30 (t=10501 jiffies g=146109 q=443) rcu: rcu_preempt kthread starved for 10440 jiffies! g146109 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: rcu_preempt R running task 29080 10 2 0x00004000 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x8e5/0x21e0 kernel/sched/core.c:4527 schedule+0xd0/0x2a0 kernel/sched/core.c:4602 schedule_timeout+0x148/0x250 kernel/time/timer.c:1879 rcu_gp_fqs_loop kernel/rcu/tree.c:1887 [inline] rcu_gp_kthread+0xae5/0x1b50 kernel/rcu/tree.c:2057 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 NMI backtrace for cpu 1 CPU: 1 PID: 21630 Comm: syz-executor.1 Not tainted 5.8.0-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+0x18f/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1b3/0x223 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x194/0x1cf kernel/rcu/tree_stall.h:318 print_cpu_stall kernel/rcu/tree_stall.h:551 [inline] check_cpu_stall kernel/rcu/tree_stall.h:625 [inline] rcu_pending kernel/rcu/tree.c:3635 [inline] rcu_sched_clock_irq.cold+0x5b3/0xccd kernel/rcu/tree.c:2518 update_process_times+0x25/0xa0 kernel/time/timer.c:1710 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:176 tick_sched_timer+0x1d1/0x2a0 kernel/time/tick-sched.c:1328 __run_hrtimer kernel/time/hrtimer.c:1520 [inline] __hrtimer_run_queues+0x1d5/0xfc0 kernel/time/hrtimer.c:1584 hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1646 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline] __sysvec_apic_timer_interrupt+0x142/0x5e0 arch/x86/kernel/apic/apic.c:1097 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:50 [inline] sysvec_apic_timer_interrupt+0x4c/0xf0 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581 RIP: 0010:rb_first+0x42/0x80 lib/rbtree.c:473 Code: 02 00 75 46 48 bb 00 00 00 00 00 fc ff df 48 8b 07 48 85 c0 75 05 eb 1d 48 89 d0 48 8d 78 10 48 89 fa 48 c1 ea 03 80 3c 1a 00 <75> 0f 48 8b 50 10 48 85 d2 75 e3 48 83 c4 08 5b c3 48 89 04 24 e8 RSP: 0018:ffffc90000da8cd8 EFLAGS: 00000246 RAX: ffff8880a21db500 RBX: dffffc0000000000 RCX: ffffffff815b3b40 RDX: 1ffff1101443b6a2 RSI: 0000000000000004 RDI: ffff8880a21db510 RBP: 0000000000000100 R08: 0000000000000001 R09: 0000000000000003 R10: fffff520001b5190 R11: 0000000000000001 R12: ffff8880a7cb0000 R13: ffff8880a7cb00b0 R14: 1ffff920001b51a7 R15: ffff8880ae725600 mrp_mad_event net/802/mrp.c:570 [inline] mrp_join_timer+0x2f/0xc0 net/802/mrp.c:591 call_timer_fn+0x1ac/0x760 kernel/time/timer.c:1413 expire_timers kernel/time/timer.c:1458 [inline] __run_timers.part.0+0x67c/0xaa0 kernel/time/timer.c:1755 __run_timers kernel/time/timer.c:1736 [inline] run_timer_softirq+0xae/0x1a0 kernel/time/timer.c:1768 __do_softirq+0x2de/0xa24 kernel/softirq.c:298 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline] do_softirq_own_stack+0x9d/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu kernel/softirq.c:423 [inline] irq_exit_rcu+0x1f3/0x230 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0x51/0xf0 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581 RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:196 Code: 48 89 ef 5d e9 21 b4 3f 00 5d be 03 00 00 00 e9 76 7b 24 02 66 0f 1f 44 00 00 48 8b be b0 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 <65> 48 8b 14 25 00 ff 01 00 65 8b 05 d0 e1 8d 7e a9 00 01 ff 00 48 RSP: 0018:ffffc900081473e8 EFLAGS: 00000246 RAX: 0000000000000002 RBX: 0000000000000010 RCX: ffffffff8363a57a RDX: 0000000000000010 RSI: ffff8880309f8140 RDI: 0000000000000001 RBP: ffff8880a2b3f480 R08: 0000000000000001 R09: ffffffff8cb06047 R10: 0000000000000010 R11: 0000000000000001 R12: 0000000000000010 R13: 000000000000015f R14: dffffc0000000000 R15: 0000000000000000 tomoyo_domain_quota_is_ok+0xf8/0x550 security/tomoyo/util.c:1032 tomoyo_supervisor+0x2d4/0xeb0 security/tomoyo/common.c:2089 tomoyo_audit_path_number_log security/tomoyo/file.c:235 [inline] tomoyo_path_number_perm+0x3ed/0x4d0 security/tomoyo/file.c:734 tomoyo_path_mknod+0x10d/0x190 security/tomoyo/tomoyo.c:240 security_path_mknod+0xf9/0x170 security/security.c:1077 may_o_create fs/namei.c:2919 [inline] lookup_open.isra.0+0x431/0x1350 fs/namei.c:3060 open_last_lookups fs/namei.c:3169 [inline] path_openat+0x96d/0x2750 fs/namei.c:3357 do_filp_open+0x17e/0x3c0 fs/namei.c:3387 do_sys_openat2+0x16f/0x3b0 fs/open.c:1179 do_sys_open fs/open.c:1195 [inline] __do_sys_openat fs/open.c:1209 [inline] __se_sys_openat fs/open.c:1204 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1204 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45ccd9 Code: 2d 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 fb b5 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f523baf1c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000022e80 RCX: 000000000045ccd9 RDX: 0000000000101040 RSI: 0000000020000440 RDI: 00000000ffffff9c RBP: 000000000078bf48 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c R13: 00007ffde843ef1f R14: 00007f523baf29c0 R15: 000000000078bf0c