sshd (4652) used greatest stack depth: 16872 bytes left random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) ============================= WARNING: suspicious RCU usage 4.19.0-rc1-next-20180831+ #53 Not tainted ----------------------------- include/linux/rcupdate.h:631 rcu_read_lock() used illegally while idle! other info that might help us debug this: RCU used illegally from idle CPU! rcu_scheduler_active = 2, debug_locks = 1 RCU used illegally from extended quiescent state! 1 lock held by swapper/1/0: #0: 000000006619aa13 (rcu_read_lock){....}, at: trace_call_bpf+0xf8/0x640 kernel/trace/bpf_trace.c:46 stack backtrace: CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.19.0-rc1-next-20180831+ #53 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+0x1c9/0x2b4 lib/dump_stack.c:113 lockdep_rcu_suspicious+0x14a/0x153 kernel/locking/lockdep.c:4537 rcu_read_lock include/linux/rcupdate.h:630 [inline] trace_call_bpf+0x533/0x640 kernel/trace/bpf_trace.c:72 perf_trace_run_bpf_submit+0x15c/0x3b0 kernel/events/core.c:8264 perf_trace_preemptirq_template+0x3dd/0x650 include/trace/events/preemptirq.h:14 ============================= WARNING: suspicious RCU usage trace_irq_enable_rcuidle include/trace/events/preemptirq.h:40 [inline] trace_hardirqs_on_caller+0x227/0x2b0 kernel/trace/trace_preemptirq.c:51 4.19.0-rc1-next-20180831+ #53 Not tainted ----------------------------- kernel/trace/bpf_trace.c:72 suspicious rcu_dereference_check() usage! other info that might help us debug this: trace_hardirqs_on_thunk+0x1a/0x1c RCU used illegally from idle CPU! rcu_scheduler_active = 2, debug_locks = 1 retint_kernel+0x10/0x10 RCU used illegally from extended quiescent state! RIP: 0010:native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:56 1 lock held by swapper/0/0: Code: c7 48 89 45 d8 e8 ea 4c e5 fa 48 8b 45 d8 e9 d2 fe ff ff 48 89 df e8 d9 4c e5 fa eb 8a 90 90 90 90 90 90 90 55 48 89 e5 fb f4 <5d> c3 0f 1f 84 00 00 00 00 00 55 48 89 e5 f4 5d c3 90 90 90 90 90 #0: 000000006619aa13 RSP: 0018:ffff8801d9f1fc30 EFLAGS: 00000286 ( ORIG_RAX: ffffffffffffff02 rcu_read_lock RAX: dffffc0000000000 RBX: 1ffff1003b3e3f8a RCX: 0000000000000000 ){....} RDX: 1ffffffff10237d0 RSI: 0000000000000001 RDI: ffffffff8811be80 , at: trace_call_bpf+0xf8/0x640 kernel/trace/bpf_trace.c:46 stack backtrace: RBP: ffff8801d9f1fc30 R08: ffff8801d9f0e380 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 R13: ffff8801d9f1fcf0 R14: 0000000000000001 R15: 0000000000000000 arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline] default_idle+0xc2/0x410 arch/x86/kernel/process.c:498 arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:489 default_idle_call+0x6d/0x90 kernel/sched/idle.c:93 cpuidle_idle_call kernel/sched/idle.c:153 [inline] do_idle+0x3aa/0x580 kernel/sched/idle.c:262 cpu_startup_entry+0x10c/0x120 kernel/sched/idle.c:368 start_secondary+0x433/0x5d0 arch/x86/kernel/smpboot.c:271 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:242 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.19.0-rc1-next-20180831+ #53 ============================= Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 WARNING: suspicious RCU usage Call Trace: 4.19.0-rc1-next-20180831+ #53 Not tainted __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 ----------------------------- include/linux/rcupdate.h:680 rcu_read_unlock() used illegally while idle! other info that might help us debug this: lockdep_rcu_suspicious+0x14a/0x153 kernel/locking/lockdep.c:4537 RCU used illegally from idle CPU! rcu_scheduler_active = 2, debug_locks = 1 trace_call_bpf+0x4cb/0x640 kernel/trace/bpf_trace.c:72 RCU used illegally from extended quiescent state! 1 lock held by swapper/1/0: #0: 000000006619aa13 perf_trace_run_bpf_submit+0x15c/0x3b0 kernel/events/core.c:8264 ( rcu_read_lock ){....} , at: trace_call_bpf+0xf8/0x640 kernel/trace/bpf_trace.c:46 stack backtrace: perf_trace_preemptirq_template+0x3dd/0x650 include/trace/events/preemptirq.h:14 trace_irq_enable_rcuidle include/trace/events/preemptirq.h:40 [inline] trace_hardirqs_on+0x22e/0x2c0 kernel/trace/trace_preemptirq.c:25 default_idle+0x8d/0x410 arch/x86/kernel/process.c:498 arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:489 default_idle_call+0x6d/0x90 kernel/sched/idle.c:93 cpuidle_idle_call kernel/sched/idle.c:153 [inline] do_idle+0x3aa/0x580 kernel/sched/idle.c:262 cpu_startup_entry+0x10c/0x120 kernel/sched/idle.c:368 rest_init+0xe1/0xe4 init/main.c:442 start_kernel+0x913/0x94e init/main.c:739 x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:452 x86_64_start_kernel+0x76/0x79 arch/x86/kernel/head64.c:433 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:242 CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.19.0-rc1-next-20180831+ #53 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+0x1c9/0x2b4 lib/dump_stack.c:113 lockdep_rcu_suspicious+0x14a/0x153 kernel/locking/lockdep.c:4537 rcu_read_unlock include/linux/rcupdate.h:679 [inline] trace_call_bpf+0x579/0x640 kernel/trace/bpf_trace.c:72 perf_trace_run_bpf_submit+0x15c/0x3b0 kernel/events/core.c:8264 perf_trace_preemptirq_template+0x3dd/0x650 include/trace/events/preemptirq.h:14 trace_irq_enable_rcuidle include/trace/events/preemptirq.h:40 [inline] trace_hardirqs_on_caller+0x227/0x2b0 kernel/trace/trace_preemptirq.c:51 trace_hardirqs_on_thunk+0x1a/0x1c retint_kernel+0x10/0x10 RIP: 0010:native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:56 Code: c7 48 89 45 d8 e8 ea 4c e5 fa 48 8b 45 d8 e9 d2 fe ff ff 48 89 df e8 d9 4c e5 fa eb 8a 90 90 90 90 90 90 90 55 48 89 e5 fb f4 <5d> c3 0f 1f 84 00 00 00 00 00 55 48 89 e5 f4 5d c3 90 90 90 90 90 RSP: 0018:ffff8801d9f1fc30 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff02 RAX: dffffc0000000000 RBX: 1ffff1003b3e3f8a RCX: 0000000000000000 RDX: 1ffffffff10237d0 RSI: 0000000000000001 RDI: ffffffff8811be80 RBP: ffff8801d9f1fc30 R08: ffff8801d9f0e380 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 R13: ffff8801d9f1fcf0 R14: 0000000000000001 R15: 0000000000000000 arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline] default_idle+0xc2/0x410 arch/x86/kernel/process.c:498 arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:489 default_idle_call+0x6d/0x90 kernel/sched/idle.c:93 cpuidle_idle_call kernel/sched/idle.c:153 [inline] do_idle+0x3aa/0x580 kernel/sched/idle.c:262 cpu_startup_entry+0x10c/0x120 kernel/sched/idle.c:368 start_secondary+0x433/0x5d0 arch/x86/kernel/smpboot.c:271 ? set_cpu_si