rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (10499 ticks this GP) idle=6a6/1/0x4000000000000000 softirq=10111/10111 fqs=0 (t=10500 jiffies g=8769 q=722) rcu: rcu_preempt kthread starved for 10500 jiffies! g8769 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 28896 10 2 0x00004000 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x979/0xce0 kernel/sched/core.c:4527 NMI backtrace for cpu 1 CPU: 1 PID: 8372 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+0x1f0/0x31e lib/dump_stack.c:118 nmi_cpu_backtrace+0x9f/0x180 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x16a/0x280 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x199/0x2a0 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+0x1920/0x1eb0 kernel/rcu/tree.c:2518 update_process_times+0x130/0x1b0 kernel/time/timer.c:1710 tick_sched_handle kernel/time/tick-sched.c:176 [inline] tick_sched_timer+0x25e/0x410 kernel/time/tick-sched.c:1328 __run_hrtimer kernel/time/hrtimer.c:1520 [inline] __hrtimer_run_queues+0x42d/0x930 kernel/time/hrtimer.c:1584 hrtimer_interrupt+0x373/0xd60 kernel/time/hrtimer.c:1646 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline] __sysvec_apic_timer_interrupt+0xf0/0x260 arch/x86/kernel/apic/apic.c:1097 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:50 [inline] sysvec_apic_timer_interrupt+0xd0/0xf0 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:592 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:770 [inline] RIP: 0010:lock_release+0x3c4/0x750 kernel/locking/lockdep.c:5026 Code: 48 c1 e8 03 42 80 3c 28 00 74 0c 48 c7 c7 b8 d8 2b 89 e8 af 01 5a 00 48 83 3d df d7 d1 07 00 0f 84 5c 03 00 00 4c 89 e7 57 9d <0f> 1f 44 00 00 65 48 8b 04 25 28 00 00 00 48 3b 44 24 50 0f 85 40 RSP: 0018:ffffc90000da8ca8 EFLAGS: 00000282 RAX: 1ffffffff1257b17 RBX: 1ffff110125595b9 RCX: ffff888092aca500 RDX: ffff888092acadc8 RSI: ffff88808b8c79a0 RDI: 0000000000000282 RBP: da3885633793f48b R08: dffffc0000000000 R09: fffffbfff12daf2e R10: fffffbfff12daf2e R11: 0000000000000000 R12: 0000000000000282 R13: dffffc0000000000 R14: dffffc0000000000 R15: ffff888092acadcc __raw_write_unlock include/linux/rwlock_api_smp.h:218 [inline] _raw_write_unlock+0x12/0x40 kernel/locking/spinlock.c:327 addrconf_rs_timer+0x44f/0x680 net/ipv6/addrconf.c:3870 call_timer_fn+0x91/0x160 kernel/time/timer.c:1413 expire_timers kernel/time/timer.c:1458 [inline] __run_timers+0x65e/0x830 kernel/time/timer.c:1755 run_timer_softirq+0x46/0x80 kernel/time/timer.c:1768 __do_softirq+0x236/0x66c kernel/softirq.c:298 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:711 __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+0x91/0xe0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu+0x1e1/0x1f0 kernel/softirq.c:423 irq_exit_rcu+0x5/0x10 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0xd5/0xf0 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:592 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:770 [inline] RIP: 0010:slab_alloc mm/slab.c:3313 [inline] RIP: 0010:kmem_cache_alloc+0x1a8/0x2d0 mm/slab.c:3484 Code: 8b 3c 24 57 9d 0f 1f 44 00 00 e8 d3 0d c7 ff eb 1e e8 bc 08 c7 ff 48 83 3d ec 5f 78 07 00 0f 84 26 01 00 00 48 8b 3c 24 57 9d <0f> 1f 44 00 00 41 0f 18 0e e9 21 00 00 00 89 e8 c1 e8 08 83 e0 01 RSP: 0018:ffffc90005517db0 EFLAGS: 00000282 RAX: 0000000000004341 RBX: 0000000000000cc0 RCX: dffffc0000000000 RDX: ffffc9000a070000 RSI: 000000000000031a RDI: 0000000000000282 RBP: 0000000000000cc0 R08: ffffffff817a81b0 R09: ffffed10154c15e1 R10: ffffed10154c15e1 R11: 0000000000000000 R12: ffff88821bc4e700 R13: ffff88821bc4e700 R14: ffff8880464f6540 R15: ffffffff81c035c8 getname_flags+0xb8/0x610 fs/namei.c:138 do_sys_openat2+0x40d/0x770 fs/open.c:1173 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+0x1c8/0x1f0 fs/open.c:1204 do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:384 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:00007fee2426cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000023140 RCX: 000000000045ccd9 RDX: 0000000000000000 RSI: 0000000020000000 RDI: ffffffffffffff9c RBP: 000000000078bf48 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c R13: 00007ffd498923ff R14: 00007fee2426d9c0 R15: 000000000078bf0c