Sorry I forgot to print my execution steps:
#> s6-ipcserver-socketbinder /tmp/mysocket s6-fdholder-store /etc/s6/fdholder/socket MYSOCKET s6-fdholder-storec: fatal: unable to store fd: Operation not permitted #> rm /etc/s6/fdholder/rules/uid/default/env/S6_FDHOLDER_LIST #> rm /etc/s6/fdholder/rules/uid/default/env/S6_FDHOLDER_STORE_REGEX #> s6-ipcserver-socketbinder /tmp/mysocket s6-fdholder-store /etc/s6/fdholder/socket MYSOCKET s6-fdholder-storec: fatal: unable to store fd: Operation not permitted (...segfaulted…) I also created a test container https://github.com/glerchundi/container-test reproducing this behaviour. On Wed, Feb 18, 2015 at 3:58 PM, Laurent Bercot <ska-supervis...@skarnet.org> wrote: > On 18/02/2015 15:31, Gorka Lertxundi wrote: >> s6-fdholderd[20489]: segfault at 104fb ip 000000000040cd03 sp >> 00007fff8ffca460 error 4 in s6-fdholderd[400000+17000] > Wow. A segfault is bad indeed. > Please send me: > - the name and version of your OS and compiler > - your skalibs sysdeps file > - if possible, a system call trace output of s6-fdholderd. > To do that, add "strace -v", or whatever your tracer's invocation > command is, in front of "s6-fdholder-daemon" in your run script; > make sure to add the options to continue tracing after execve() > (it's the default for strace, not sure about the other ones). > strace will then dump its output to your fd-holder service's logger. > ktrace works differently, but you should find the ktrace.out in the > service directory. Not sure about truss. >> - I'm missing something? Segfault seems that something is going really >> wrong in here. > You're not missing anything, there's something wrong indeed and I > can't reproduce on my usual platform. I will need all the information > you can give me to debug this. >> - How would be the steps to create&use a pipe and forward log messages >> to it? > * mkfifo /service/mysqld-log-general/fifo > * In /service/mysqld-log-general/run, redirect stdin to fifo before > running s6-log > * In /service/mysqld/run, or in the appropriate configuration file, > give the right options to mysqld so it writes its general log to > /service/mysqld-log-general/fifo >> 1.- s6-mkfifodir or mkpipe? > Not s6-mkfifodir, a fifodir is not a fifo ;) >> 2.- How to register into the fdholder store? >> obviusly this won't work: s6-ipcserver-socketbinder /my/pipe >> s6-fdholder-store /etc/s6/fdholder/socket MYPIPE? > Nope, s6-ipcserver-socketbinder creates a socket, not a pipe. > Try "redirfd -rnb 0 /my/pipe s6-fdholder-store /etc/s6/fdholder/socket > MYPIPE", > once the segfault is fixed... >> 3.- How to pipe from holder to s6-log? > You don't need to. Just read normally from the fifo. > s6-fdholderd is just there to keep the reading end of the fifo open > in case s6-log dies. > -- > Laurent
