rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (1 GPs behind) idle=9fe/1/0x4000000000000004 softirq=67550/67553 fqs=5250 rcu: (t=10502 jiffies g=87053 q=26577) NMI backtrace for cpu 0 CPU: 0 PID: 1930 Comm: syz-executor.2 Not tainted 5.1.0-rc5+ #181 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+0x172/0x1f0 lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1be/0x236 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x183/0x1cf kernel/rcu/tree.c:1223 print_cpu_stall kernel/rcu/tree.c:1360 [inline] check_cpu_stall kernel/rcu/tree.c:1434 [inline] rcu_pending kernel/rcu/tree.c:3103 [inline] rcu_sched_clock_irq.cold+0x500/0xa4a kernel/rcu/tree.c:2544 update_process_times+0x32/0x80 kernel/time/timer.c:1635 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:161 tick_sched_timer+0x47/0x130 kernel/time/tick-sched.c:1271 __run_hrtimer kernel/time/hrtimer.c:1389 [inline] __hrtimer_run_queues+0x33e/0xde0 kernel/time/hrtimer.c:1451 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1035 [inline] smp_apic_timer_interrupt+0x120/0x570 arch/x86/kernel/apic/apic.c:1060 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 RIP: 0010:rose_find_socket+0x7d/0x120 net/rose/af_rose.c:281 Code: fb 49 8d 7c 24 68 48 89 f8 48 c1 e8 03 80 3c 18 00 0f 85 a4 00 00 00 4d 8b 64 24 68 4d 85 e4 0f 84 8a 00 00 00 e8 03 c4 30 fb <49> 83 ec 68 74 7f e8 f8 c3 30 fb 49 8d bc 24 e0 04 00 00 48 89 f8 RSP: 0018:ffff8880ae807c90 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 RAX: ffff88805a7365c0 RBX: dffffc0000000000 RCX: ffffffff863fc8e6 RDX: 0000000000000100 RSI: ffffffff863fc8ad RDI: ffff8880658d8428 RBP: ffff8880ae807cb8 R08: ffff88805a7365c0 R09: ffffed1015d00f80 R10: ffffed1015d00f7f R11: 0000000000000003 R12: ffff8880658d8428 R13: 00000000fffff034 R14: ffff88809b2c4280 R15: 0000000000000000 rose_loopback_timer+0x336/0x480 net/rose/rose_loopback.c:94 call_timer_fn+0x190/0x720 kernel/time/timer.c:1325 expire_timers kernel/time/timer.c:1362 [inline] __run_timers kernel/time/timer.c:1681 [inline] __run_timers kernel/time/timer.c:1649 [inline] run_timer_softirq+0x652/0x1700 kernel/time/timer.c:1694 __do_softirq+0x266/0x95a kernel/softirq.c:293 invoke_softirq kernel/softirq.c:374 [inline] irq_exit+0x180/0x1d0 kernel/softirq.c:414 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x14a/0x570 arch/x86/kernel/apic/apic.c:1062 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 RIP: 0010:idr_find+0x1/0x60 lib/idr.c:172 Code: 24 48 4c 89 e7 31 d2 48 29 c3 48 89 de e8 97 fc 00 00 5b 41 5c 5d c3 e8 fd b1 9e fa eb df 90 66 2e 0f 1f 84 00 00 00 00 00 55 <48> 89 e5 41 54 49 89 fc 53 48 89 f3 e8 4e a2 66 fa 49 8d 7c 24 48 RSP: 0018:ffff888069a979b8 EFLAGS: 00000216 ORIG_RAX: ffffffffffffff13 RAX: ffff8880929b4000 RBX: ffff888069a97a80 RCX: ffffc9000a21d000 RDX: 0000000000001e13 RSI: 0000000000000003 RDI: ffffffff88a1b0e0 RBP: ffff888069a97aa8 R08: ffff88805a7365c0 R09: ffffffff895e67d4 R10: ffff88805a736e40 R11: ffff88805a7365c0 R12: 0000000000000003 R13: 0000000000000000 R14: 0000000000000003 R15: 000000000000000b shrink_node+0x552/0x1570 mm/vmscan.c:2724 shrink_zones mm/vmscan.c:2953 [inline] do_try_to_free_pages+0x3cb/0x11e0 mm/vmscan.c:3015 try_to_free_mem_cgroup_pages+0x2dd/0xa40 mm/vmscan.c:3319 reclaim_high.constprop.0+0xb3/0x100 mm/memcontrol.c:2152 mem_cgroup_handle_over_high+0x8e/0x130 mm/memcontrol.c:2177 tracehook_notify_resume include/linux/tracehook.h:190 [inline] exit_to_usermode_loop+0x1ee/0x2c0 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x52d/0x610 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458d99 Code: ad b8 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 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f0650713c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000458d99 RDX: 0000000020000000 RSI: 0000001000008912 RDI: 0000000000000003 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f06507146d4 R13: 00000000004bffcd R14: 00000000004d2310 R15: 00000000ffffffff