# Debug using strace

To debug with strace, run the following commands using SSH:

1. Run the process status command:

> 
> 
> ps -ef
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> 
> 
> **Sample output:**
> 
> 
> root         440       1  0 00:00 ?        00:00:00 /usr/lib/system/systemd-udevd
>         Copy to clipboard
2. Identify the PID of the process that you want to debug.
3. Run the strace command:

> 
> 
> strace -p 440
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    In this example, `440` is the PID

> 
> 
> **Sample output:**
> 
> 
> root@iq-9075-evk:/# strace -p 440
>         strace: Process 440 attached
>         gettid()                                = 440
>         epoll_pwait(7, [{events=EPOLLIN, data=0xb}], 212, -1, NULL, 8) = 1
>         read(11, "\1\0\0\0\0\0\0\0", 8)         = 8
>         socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0) = 15
>         getsockopt(15, SOL_SOCKET, SO_SNDBUF, [212992], [4]) = 0
>         setsockopt(15, SOL_SOCKET, SO_SNDBUF, [8388608], 4) = 0
>         getsockopt(15, SOL_SOCKET, SO_SNDBUF, [8388608], [4]) = 0
>         setsockopt(15, SOL_SOCKET, SO_SNDBUFFORCE, [8388608], 4) = 0
>         getuid()                                = 0
>         geteuid()                               = 0
>         getgid()                                = 0
>         getegid()                               = 0
>         sendmsg(15, {msg_name={sa_family=AF_UNIX, sun_path="/run/systemd/notify"}, msg_namelen=22, msg_iov=[{iov_base="WATCHDOG=1", iov_len=10}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 10
>         close(15)                               = 0
>         timerfd_settime(11, TFD_TIMER_ABSTIME, {it_interval={tv_sec=0, tv_nsec=0}, it_value={tv_sec=1490, tv_nsec=794546000}}, NULL) = 0
>         gettid()                                = 440
>         epoll_pwait(7
>         Copy to clipboard

    For more information about strace, see [Linux manual page](https://man7.org/linux/man-pages/man1/strace.1.html).

Last Published: May 14, 2026

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