Hello I have been debugging a process that makes a syscall which never returned. The problem was the interaction between than process and other kernel threads, due to an error on the way the locks were designed (my bad). Luckily, the error is gone now :). but I was wondering if there is a way to show the backtrace of ALL the threads in the system, which could have been a wonderful tool to debug this issue. Things that I tried and NOT worked: 1) perf top: It is fast and easy if the tasks are in active loops, but if they are sleeping, waiting for an event, holding a lock.... they will not appear. 2) ftrace works, but there are MILLIONS of lines to navigate :S Unless there is a good way to navigate the data it is a "last resource" tool. 3) gdb vmlinux /proc/kcore; info threads I had big hopes on this... but only one thread was showed. Are the Linux awareness gdb extensions ready? 4) sysrq, print backtrace It only shows the active threads, not the "waiting" ones What I want? A magic command that shows the backtrace of ALL the threads (kernel and userland). Something like a ps with steroids. Does this exist? Where would be the best place to start developing something like this: perf people, unix-utils, systemd :S , alone in a dark basement? Thanks! -- Ricardo Ribalda