[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 23.660173] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 27.788926] random: sshd: uninitialized urandom read (32 bytes read) [ 28.062216] random: sshd: uninitialized urandom read (32 bytes read) [ 28.593982] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.18' (ECDSA) to the list of known hosts. [ 34.615537] urandom_read: 1 callbacks suppressed [ 34.615543] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 34.729086] [ 34.730818] ============================= [ 34.734969] WARNING: suspicious RCU usage [ 34.736167] hrtimer: interrupt took 33003 ns [ 34.739118] 4.19.0-rc1+ #86 Not tainted [ 34.747489] ----------------------------- [ 34.751645] include/linux/rcupdate.h:631 rcu_read_lock() used illegally while idle! [ 34.759435] [ 34.759435] other info that might help us debug this: [ 34.759435] [ 34.767614] [ 34.767614] RCU used illegally from idle CPU! [ 34.767614] rcu_scheduler_active = 2, debug_locks = 1 [ 34.778641] RCU used illegally from extended quiescent state! [ 34.784528] 1 lock held by swapper/0/0: [ 34.788503] #0: 000000001570261f (rcu_read_lock){....}, at: trace_call_bpf+0xf8/0x640 [ 34.796603] [ 34.796603] stack backtrace: [ 34.801118] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.19.0-rc1+ #86 [ 34.807696] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.817190] Call Trace: [ 34.819795] dump_stack+0x1c9/0x2b4 [ 34.823439] ? dump_stack_print_info.cold.2+0x52/0x52 [ 34.828653] ? vprintk_func+0x81/0x117 [ 34.832555] lockdep_rcu_suspicious+0x14a/0x153 [ 34.837244] trace_call_bpf+0x533/0x640 [ 34.841224] ? mark_held_locks+0x160/0x160 [ 34.845583] ? kprobe_prog_is_valid_access+0xa0/0xa0 [ 34.850702] ? mark_held_locks+0x160/0x160 [ 34.854962] ? find_held_lock+0x36/0x1c0 [ 34.859046] perf_trace_run_bpf_submit+0x15c/0x3b0 [ 34.863995] ? perf_tp_event+0xc40/0xc40 [ 34.868072] ? graph_lock+0x170/0x170 [ 34.871881] ? graph_lock+0x170/0x170 [ 34.875698] ? memset+0x31/0x40 [ 34.879003] perf_trace_preemptirq_template+0x3dd/0x650 [ 34.884386] ? retint_kernel+0x10/0x10 [ 34.888287] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 34.893060] ? tracing_start_sched_switch.cold.0+0x78/0x78 [ 34.898702] ? lock_downgrade+0x8f0/0x8f0 [ 34.902870] ? trace_hardirqs_off+0xb8/0x2b0 [ 34.907294] ? rcu_seq_end+0x120/0x120 [ 34.911196] ? perf_trace_preemptirq_template+0x3f9/0x650 [ 34.916745] ? trace_hardirqs_on+0x2c0/0x2c0 [ 34.921170] ? arch_cpu_idle+0x10/0x20 [ 34.925067] ? default_idle+0x8d/0x410 [ 34.929455] ? retint_kernel+0x10/0x10 [ 34.933359] ? tracing_start_sched_switch.cold.0+0x78/0x78 [ 34.938999] trace_hardirqs_on_caller+0x227/0x2b0 [ 34.943864] ? timekeeping_max_deferment+0x20a/0x330 [ 34.948981] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 34.953750] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 34.959216] ? timekeeping_valid_for_hres+0x340/0x340 [ 34.964430] trace_hardirqs_on_thunk+0x1a/0x1c [ 34.969033] ? rcu_dynticks_eqs_enter+0x22/0x30 [ 34.973716] retint_kernel+0x10/0x10 [ 34.977438] RIP: 0010:native_safe_halt+0x6/0x10 [ 34.982122] Code: c7 48 89 45 d8 e8 ca 4d e7 fa 48 8b 45 d8 e9 d2 fe ff ff 48 89 df e8 b9 4d e7 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 [ 35.001030] RSP: 0018:ffffffff88007bb8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 [ 35.008755] RAX: dffffc0000000000 RBX: 1ffffffff1000f7b RCX: 0000000000000000 [ 35.016034] RDX: 1ffffffff10237b8 RSI: 0000000000000001 RDI: ffffffff8811bdc0 [ 35.023314] RBP: ffffffff88007bb8 R08: ffffffff88075e00 R09: 0000000000000000 [ 35.030592] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 35.037877] R13: ffffffff88007c78 R14: 0000000000000000 R15: 0000000000000000 [ 35.045186] default_idle+0xc2/0x410 [ 35.048917] ? kasan_check_write+0x14/0x20 [ 35.053175] ? __sched_text_end+0x1/0x1 [ 35.057165] ? rcu_idle_enter+0x30a/0x480 [ 35.061325] ? rcu_eqs_special_set+0x1b0/0x1b0 [ 35.065925] ? tsc_verify_tsc_adjust+0x109/0x380 [ 35.070708] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 35.075826] ? mark_tsc_async_resets+0x20/0x20 [ 35.080419] ? trace_hardirqs_on+0x2c0/0x2c0 [ 35.084512] [ 35.084842] ? __tick_nohz_idle_restart_tick+0x28c/0x3c0 [ 35.086458] ============================= [ 35.091913] arch_cpu_idle+0x10/0x20 [ 35.096039] WARNING: suspicious RCU usage [ 35.099747] default_idle_call+0x6d/0x90 [ 35.103876] 4.19.0-rc1+ #86 Not tainted [ 35.107938] do_idle+0x3aa/0x580 [ 35.111881] ----------------------------- [ 35.115250] ? arch_cpu_idle_exit+0x70/0x70 [ 35.119379] kernel/trace/bpf_trace.c:72 suspicious rcu_dereference_check() usage! [ 35.123693] ? __schedule+0x1df0/0x1df0 [ 35.131288] [ 35.131288] other info that might help us debug this: [ 35.131288] [ 35.135274] cpu_startup_entry+0x10c/0x120 [ 35.143397] [ 35.143397] RCU used illegally from idle CPU! [ 35.143397] rcu_scheduler_active = 2, debug_locks = 1 [ 35.147641] ? cpu_in_idle+0x20/0x20 [ 35.158622] RCU used illegally from extended quiescent state! [ 35.162349] rest_init+0xe1/0xe4 [ 35.168205] 1 lock held by swapper/1/0: [ 35.171564] start_kernel+0x913/0x94e [ 35.175520] #0: 000000001570261f [ 35.179319] ? mem_encrypt_init+0xb/0xb [ 35.179340] ? early_idt_handler_common+0x3b/0x60 [ 35.182769] ( [ 35.186747] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 35.191561] rcu_read_lock [ 35.193367] ? x86_family+0x3e/0x50 [ 35.198877] ){....} [ 35.201643] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 35.205250] , at: trace_call_bpf+0xf8/0x640 [ 35.207483] x86_64_start_reservations+0x29/0x2b [ 35.212993] [ 35.212993] stack backtrace: [ 35.217315] x86_64_start_kernel+0x76/0x79 [ 35.230763] secondary_startup_64+0xa4/0xb0 [ 35.235106] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.19.0-rc1+ #86 [ 35.235108] [ 35.235117] ============================= [ 35.241692] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.243309] WARNING: suspicious RCU usage [ 35.247446] Call Trace: [ 35.256791] 4.19.0-rc1+ #86 Not tainted [ 35.260941] dump_stack+0x1c9/0x2b4 [ 35.263510] ----------------------------- [ 35.267490] ? dump_stack_print_info.cold.2+0x52/0x52 [ 35.271101] include/linux/rcupdate.h:680 rcu_read_unlock() used illegally while idle! [ 35.275248] ? vprintk_func+0x81/0x117 [ 35.280410] [ 35.280410] other info that might help us debug this: [ 35.280410] [ 35.288377] lockdep_rcu_suspicious+0x14a/0x153 [ 35.292256] [ 35.292256] RCU used illegally from idle CPU! [ 35.292256] rcu_scheduler_active = 2, debug_locks = 1 [ 35.300414] trace_call_bpf+0x4cb/0x640 [ 35.305083] RCU used illegally from extended quiescent state! [ 35.316087] ? kprobe_prog_is_valid_access+0xa0/0xa0 [ 35.320045] 1 lock held by swapper/0/0: [ 35.325927] ? rcu_cleanup_dead_rnp+0x200/0x200 [ 35.331013] #0: [ 35.334992] ? trace_call_bpf+0x418/0x640 [ 35.339635] 000000001570261f [ 35.341697] perf_trace_run_bpf_submit+0x15c/0x3b0 [ 35.345819] ( [ 35.348839] ? perf_tp_event+0xc40/0xc40 [ 35.353741] rcu_read_lock [ 35.355545] ? _raw_spin_unlock_irq+0x27/0x70 [ 35.359584] ){....} [ 35.362337] ? _raw_spin_unlock_irq+0x27/0x70 [ 35.366822] , at: trace_call_bpf+0xf8/0x640 [ 35.369055] ? memset+0x31/0x40 [ 35.373525] [ 35.373525] stack backtrace: [ 35.377845] perf_trace_preemptirq_template+0x3dd/0x650 [ 35.390959] ? arch_cpu_idle+0x10/0x20 [ 35.394848] ? default_idle+0x8d/0x410 [ 35.398738] ? tracing_start_sched_switch.cold.0+0x78/0x78 [ 35.404369] ? trace_hardirqs_off+0xb8/0x2b0 [ 35.408778] ? memset+0x31/0x40 [ 35.412064] ? trace_hardirqs_on+0x2c0/0x2c0 [ 35.416488] ? rcu_seq_end+0x120/0x120 [ 35.420380] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 35.425920] ? tick_nohz_next_event+0x493/0x8a0 [ 35.430589] ? tracing_start_sched_switch.cold.0+0x78/0x78 [ 35.436222] ? default_idle+0x8d/0x410 [ 35.440108] ? tracing_start_sched_switch.cold.0+0x78/0x78 [ 35.445738] trace_hardirqs_on+0x22e/0x2c0 [ 35.449980] ? arch_cpu_idle+0x10/0x20 [ 35.453875] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 35.458988] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 35.464531] default_idle+0x8d/0x410 [ 35.468248] ? kasan_check_write+0x14/0x20 [ 35.472490] ? __sched_text_end+0x1/0x1 [ 35.476473] ? rcu_idle_enter+0x30a/0x480 [ 35.480627] ? rcu_eqs_special_set+0x1b0/0x1b0 [ 35.485215] ? tsc_verify_tsc_adjust+0x109/0x380 [ 35.489974] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 35.495083] ? mark_tsc_async_resets+0x20/0x20 [ 35.499669] ? trace_hardirqs_on+0x2c0/0x2c0 [ 35.504081] ? __tick_nohz_idle_restart_tick+0x28c/0x3c0 [ 35.509541] arch_cpu_idle+0x10/0x20 [ 35.513261] default_idle_call+0x6d/0x90 [ 35.517326] do_idle+0x3aa/0x580 [ 35.520699] ? kasan_check_write+0x14/0x20 [ 35.524942] ? arch_cpu_idle_exit+0x70/0x70 [ 35.529276] ? complete+0x62/0x80 [ 35.532741] cpu_startup_entry+0x10c/0x120 [ 35.536982] ? cpu_in_idle+0x20/0x20 [ 35.540716] start_secondary+0x433/0x5d0 [ 35.544785] ? set_cpu_sibling_map+0x18b0/0x18b0 [ 35.549562] secondary_startup_64+0xa4/0xb0 [ 35.553909] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.19.0-rc1+ #86 [ 35.560511] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.569869] Call Trace: [ 35.572477] dump_stack+0x1c9/0x2b4 [ 35.576102] ? dump_stack_print_info.cold.2+0x52/0x52 [ 35.581288] ? vprintk_func+0x81/0x117 [ 35.585174] lockdep_rcu_suspicious+0x14a/0x153 [ 35.589834] trace_call_bpf+0x579/0x640 [ 35.593796] ? kprobe_prog_is_valid_access+0xa0/0xa0 [ 35.598895] ? find_held_lock+0x36/0x1c0 [ 35.602942] perf_trace_run_bpf_submit+0x15c/0x3b0 [ 35.607860] ? perf_tp_event+0xc40/0xc40 [ 35.611906] ? graph_lock+0x170/0x170 [ 35.615687] ? graph_lock+0x170/0x170 [ 35.619485] ? memset+0x31/0x40 [ 35.622754] perf_trace_preemptirq_template+0x3dd/0x650 [ 35.628107] ? retint_kernel+0x10/0x10 [ 35.631986] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 35.636723] ? tracing_start_sched_switch.cold.0+0x78/0x78 [ 35.642331] ? lock_downgrade+0x8f0/0x8f0 [ 35.646465] ? trace_hardirqs_off+0xb8/0x2b0 [ 35.650857] ? rcu_seq_end+0x120/0x120 [ 35.654732] ? perf_trace_preemptirq_template+0x3f9/0x650 [ 35.660261] ? trace_hardirqs_on+0x2c0/0x2c0 [ 35.664652] ? arch_cpu_idle+0x10/0x20 [ 35.668522] ? default_idle+0x8d/0x410 [ 35.672392] ? retint_kernel+0x10/0x10 [ 35.676259] ? tracing_start_sched_switch.cold.0+0x78/0x78 [ 35.681864] trace_hardirqs_on_caller+0x227/0x2b0 [ 35.688088] ? timekeeping_max_deferment+0x20a/0x330 [ 35.693176] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 35.697971] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 35.703418] ? timekeeping_valid_for_hres+0x340/0x340 [ 35.708603] trace_hardirqs_on_thunk+0x1a/0x1c [ 35.713172] ? rcu_dynticks_eqs_enter+0x22/0x30 [ 35.717823] retint_kernel+0x10/0x10 [ 35.721517] RIP: 0010:native_safe_halt+0x6/0x10 [ 35.726171] Code: c7 48 89 45 d8 e8 ca 4d e7 fa 48 8b 45 d8 e9 d2 fe ff ff 48 89 df e8 b9 4d e7 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 [ 35.745056] RSP: 0018:ffffffff88007bb8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 [ 35.752750] RAX: dffffc0000000000 RBX: 1ffffffff1000f7b RCX: 0000000000000000 [ 35.760002] RDX: 1ffffffff10237b8 RSI: 0000000000000001 RDI: ffffffff8811bdc0 [ 35.767252] RBP: ffffffff88007bb8 R08: ffffffff88075e00 R09: 0000000000000000 [ 35.774503] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 35.781753] R13: ffffffff88007c78 R14: 0000000000000000 R15: 0000000000000000 [ 35.789145] default_idle+0xc2/0x410 [ 35.792851] ? kasan_check_write+0x14/0x20 [ 35.797120] ? __sched_text_end+0x1/0x1 [ 35.801144] ? rcu_idle_enter+0x30a/0x480 [ 35.805286] ? rcu_eqs_special_set+0x1b0/0x1b0 [ 35.809854] ? tsc_verify_tsc_adjust+0x109/0x380 [ 35.814599] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 35.819690] ? mark_tsc_async_resets+0x20/0x20 [ 35.824264] ? trace_hardirqs_on+0x2c0/0x2c0 [ 35.828664] ? __tick_nohz_idle_restart_tick+0x28c/0x3c0 [ 35.834105] arch_cpu_idle+0x10/0x20 [ 35.837807] default_idle_call+0x6d/0x90 [ 35.841851] do_idle+0x3aa/0x580 [ 35.845205] ? arch_cpu_idle_exit+0x70/0x70 [ 35.849511] ? __schedule+0x1df0/0x1df0 [ 35.853474] cpu_startup_entry+0x10c/0x120 [ 35.857761] ? cpu_in_idle+0x20/0x20 [ 35.861474] rest_init+0xe1/0xe4 [ 35.864825] start_kernel+0x913/0x94e [ 35.868607] ? mem_encrypt_init+0xb/0xb [ 35.872572] ? early_idt_handler_common+0x3b/0x60 [ 35.877403] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 35.882919] ? x86_famil