Hi, On Tue, May 14, 2019 at 03:20:31PM +0300, Zvi Vered wrote: > Hello, > > I ran the following command on the target (where my kernel is running): > > ~ # ./lttng create my-kernel-session --output=/tmp/my-kernel-trace > > and then: > > > ~ # ./lttng enable-event --kernel --syscall open,close > > and got: > > Error: Spawning consumerd failed > Error: Event open: Kernel consumer start failed (channel channel0, > session my-kernel-session) > PERROR - 00:25:59.397308194 [1930/1930]: listen: Invalid argument (in > lttcomm_listen_unix_sock() at unix.c:173) > PERROR - 00:25:59.397344426 [1930/1930]: sendmsg: Bad file descriptor > (in lttcomm_send_unix_sock() at unix.c:292) > Error: Failed to send data back to client > PERROR - 00:25:59.397353233 [1930/1930]: close: Bad file descriptor > (in thread_manage_clients() at main.c:4530) > Error: Event close: Kernel consumer start failed (channel channel0, > session my-kernel-session) > ~ # > > > Can you please explain the cause to this error ?
Clearly, lttng is having problem spawning the kernel consumer: Error: Spawning consumerd failed Now for the why, we will need more information from your end. > > > I'm running under a 32 bit (x86) vanilla, 4.9.20 kernel with busybox > with the following lttng versions: Are you using a distro (yocto/buildroot)? How can we reproduce the exact environment for this? This will greatly speedup this, especially if we can spawn such env in qemu. Also, could you run lttng-sessiond in verbose mode and provide the output (pastebinit)? lttng-sessiond -vvv --verbose-consumer ./lttng create my-kernel-session --output=/tmp/my-kernel-trace ./lttng enable-event --kernel --syscall open,close Cheers -- Jonathan Rajotte-Julien EfficiOS _______________________________________________ lttng-dev mailing list lttng-dev@lists.lttng.org https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
