Tracing syscalls without losing your mind to log volume

Technical Briefing | 9/7/2026

Every time you enable debug-level logging to track down a rogue process, your disk I/O hits the ceiling and the actual issue disappears under a mountain of noise. I’ve spent too many nights cleaning up full partitions because a daemon went rogue while writing verbose logs. There is a better way to see what is happening without flooding your journald buffers.

Why standard strace is a production liability

Running strace on a busy production process isn’t just heavy; it effectively stops the world for that process. It attaches to the tracer and forces the kernel to signal the debugger for every single syscall. If you are tracking a production web server, you’re essentially performing a self-inflicted DDoS attack.

bpftrace -e 'tracepoint:syscalls:sys_enter_openat { printf("Process %s is opening file: %s\n", comm, str(args->filename)); }'

Moving the inspection point closer to the metal

• eBPF hooks run asynchronously so they don’t block the target process execution
• Filtering by PID or specific syscalls at the source prevents data bloat
• You get deep kernel-level visibility without changing a single line of application code

The beauty here is that the kernel handles the filtering before the data ever reaches user space. Most folks forget that standard logging requires a context switch and a write operation to disk, whereas eBPF maps stay in memory until you explicitly pull the results. It’s the difference between surgical precision and a floodlight.

Keep a small bpftrace script handy in your toolkit for when the logs are silent but the process is clearly doing something it shouldn’t. It is the fastest way to confirm whether your application is actually hitting the filesystem or just spinning in a user-space loop. Next time a process hangs, reach for this instead of adding another debug print statement.