runsv spinning on Mac OS X

runsv spinning on Mac OS X

[Steve Purcell]

Hi all,

I'm putting together a MacPorts portfile for runit, which I'm missing  
after moving to OS X from Linux.

Having finally got it up and running I'm finding that my runsv  
processes are spinning at 100% CPU; there's no supicious log output,  
the supervised programs are running fine, and sv works as expected.   
I suspect a platform-specific issue with runsv, but I'm not in a  
position to diagnose it myself.  I have, however, used ktrace to  
collect a system-call log for a spinning runsv, which I've included  
at the bottom of this mail.

My platform is 32-bit Intel, OS X 10.4.8.  Any idea what might be  
going wrong?

-Steve


14324 runsv    CALL  poll(0xbffff930,0x2,0xf4254)
14324 runsv    RET   poll 1
14324 runsv    CALL  sigprocmask(0x1,0xbffff78c,0)
14324 runsv    RET   sigprocmask 0
14324 runsv    CALL  sigprocmask(0x1,0xbffff78c,0)
14324 runsv    RET   sigprocmask 0
14324 runsv    CALL  read(0xb,0xbffff96f,0x1)
14324 runsv    RET   read -1 errno 35 Resource temporarily unavailable
14324 runsv    CALL  wait4(0xffffffff,0xbffff968,0x1,0)
14324 runsv    RET   wait4 0
14324 runsv    CALL  read(0xf,0xbffff96f,0x1)
14324 runsv    RET   read -1 errno 35 Resource temporarily unavailable
14324 runsv    CALL  sigprocmask(0x2,0xbffff78c,0)
14324 runsv    RET   sigprocmask 0
14324 runsv    CALL  sigprocmask(0x2,0xbffff78c,0)
14324 runsv    RET   sigprocmask 0
14324 runsv    CALL  poll(0xbffff930,0x2,0xf4254)
14324 runsv    RET   poll 1
14324 runsv    CALL  sigprocmask(0x1,0xbffff78c,0)
14324 runsv    RET   sigprocmask 0
14324 runsv    CALL  sigprocmask(0x1,0xbffff78c,0)
14324 runsv    RET   sigprocmask 0
14324 runsv    CALL  read(0xb,0xbffff96f,0x1)
14324 runsv    RET   read -1 errno 35 Resource temporarily unavailable
14324 runsv    CALL  wait4(0xffffffff,0xbffff968,0x1,0)
14324 runsv    RET   wait4 0
14324 runsv    CALL  read(0xf,0xbffff96f,0x1)
14324 runsv    RET   read -1 errno 35 Resource temporarily unavailable
14324 runsv    CALL  sigprocmask(0x2,0xbffff78c,0)
14324 runsv    RET   sigprocmask 0
14324 runsv    CALL  sigprocmask(0x2,0xbffff78c,0)
14324 runsv    RET   sigprocmask 0
14324 runsv    CALL  poll(0xbffff930,0x2,0xf4254)
14324 runsv    RET   poll 1
14324 runsv    CALL  sigprocmask(0x1,0xbffff78c,0)
14324 runsv    RET   sigprocmask 0
14324 runsv    CALL  sigprocmask(0x1,0xbffff78c,0)
14324 runsv    RET   sigprocmask 0
14324 runsv    CALL  read(0xb,0xbffff96f,0x1)
14324 runsv    RET   read -1 errno 35 Resource temporarily unavailable
14324 runsv    CALL  wait4(0xffffffff,0xbffff968,0x1,0)
14324 runsv    RET   wait4 0
14324 runsv    CALL  read(0xf,0xbffff96f,0x1)
14324 runsv    RET   read -1 errno 35 Resource temporarily unavailable
14324 runsv    CALL  sigprocmask(0x2,0xbffff78c,0)
14324 runsv    RET   sigprocmask 0
14324 runsv    CALL  sigprocmask(0x2,0xbffff78c,0)
14324 runsv    RET   sigprocmask 0

Re: runsv spinning on Mac OS X

[Gerrit Pape]

On Tue, Mar 13, 2007 at 11:18:46AM +0100, Steve Purcell wrote:
> I'm putting together a MacPorts portfile for runit, which I'm missing  
> after moving to OS X from Linux.
> 
> Having finally got it up and running I'm finding that my runsv  
> processes are spinning at 100% CPU; there's no supicious log output,  
> the supervised programs are running fine, and sv works as expected.   
> I suspect a platform-specific issue with runsv, but I'm not in a  
> position to diagnose it myself.  I have, however, used ktrace to  
> collect a system-call log for a spinning runsv, which I've included  
> at the bottom of this mail.
> 
> My platform is 32-bit Intel, OS X 10.4.8.  Any idea what might be  
> going wrong?

Yes, poll() is available on that platform, but broken.  You can force
runit to use select() instead, e.g.:

 $ cd /package/admin/runit
 $ cat compile/iopause.h1 >compile/iopause.h
 $ package/install

Regards, Gerrit.

Re: runsv spinning on Mac OS X

[Steve Purcell]

On 13 Mar 2007, at 11:46, Gerrit Pape wrote:

> On Tue, Mar 13, 2007 at 11:18:46AM +0100, Steve Purcell wrote:
>> My platform is 32-bit Intel, OS X 10.4.8.  Any idea what might be
>> going wrong?
>
> Yes, poll() is available on that platform, but broken.  You can force
> runit to use select() instead, e.g.:
>
>  $ cd /package/admin/runit
>  $ cat compile/iopause.h1 >compile/iopause.h
>  $ package/install


Thanks Gerrit -- that worked nicely.  Do you think you could update  
"install.html" to reflect this additional build step?

I'll let you know if/when I get my portfile included into MacPorts so  
that you can add it to your list of runit-friendly distributions.

Best wishes,

-Steve