On 2021-01-31 10:13:30 [+0100], Udo van den Heuvel wrote: > Hello, Hi, > Found these loggings in journal, what happened here? 09:20:24 RCU stalled on CPU0. 09:21:08 Networking was not able to send packets. The RCU part indicates that something is blocking the CPU. The network part might be related (it is not bound to a CPU but if the IRQ-thread is blocked then packets won't be sent/acked). 09:21:19 systemd's watchdog killed tor because it was not responding. Most of tor's threads were waiting in pthread_cond_wait(). One thread was in getsockopt(sock, SOL_TCP, TCP_INFO, ,,). This could block/sleep in lock_sock_fast() but shouldn't since all threads were idle. Unless a packet would be received at that time. tor does not changes its priority so everything should run at SCHED_OTHER. tor got killed in the end and you did not attach any more rcu warnings so it appears that CPU0 is no longer blocked. I don't know what blocked the CPU for the time. > Kind regards, > Udo Sebastian
