On 04/18/2015 07:39 PM, Jörn Nettingsmeier wrote:
Hi *!
I've come across a mysterious problem - since a few days ago (openSUSE
Tumbleweed is a rolling release), JACK hangs during startup. If you
start it with QJackCtl, it will kill it after a while, but if you start
it from the console and strace it, you can see it hangs waiting for a
futex:
[...]
sched_get_priority_min(SCHED_FIFO) = 1
sched_get_priority_max(SCHED_FIFO) = 99
mmap(NULL, 8392704, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f9e76cfe000
mprotect(0x7f9e76cfe000, 4096, PROT_NONE) = 0
clone(child_stack=0x7f9e774fdfb0,
flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID,
parent_tidptr=0x7f9e774fe9d0, tls=0x7f9e774fe700,
child_tidptr=0x7f9e774fe9d0) = 4627
sched_setscheduler(4627, SCHED_FIFO, { 1 }) = 0
futex(0x7f9e774fed18, FUTEX_WAKE_PRIVATE, 1) = 1
munmap(0x7f9e7ba87000, 227354) = 0
futex(0x7f9e776ff078, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0x7f9e774fe9d0, FUTEX_WAIT, 4627, NULL) = ? ERESTARTSYS (To be
restarted if SA_RESTART is set)
--- SIGWINCH {si_signo=SIGWINCH, si_code=SI_KERNEL} ---
futex(0x7f9e774fe9d0, FUTEX_WAIT, 4627, NULL
and hangs forever after.
It seems to be after acquiring SCHED_FIFO, but just to be sure I
verified that I'm still in group audio, and we still have
@audio - rtprio 95
@audio - memlock 3000000
in /etc/security/limits.conf.
The problem started at the same time kernel 3.19.3 came out for
Tumbleweed, but downgrading to older kernels in the 3.19 series or as
far back as 3.17 doesn't restore jack functionality. So it must be
something in userspace.
new piece of information:
JACK2 (built from current source) fails.
JACK1 (also built from current source) appears to work. weird...
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