On 12/06/2013 09:03 AM, Roberto Bielli wrote:
Hi,
sometimes i have a strange behaviour on boot. The kernel hangs. I saw
with an hardware debugger the backtrace when i was in that situation and
i saw this:
probe_irq_off | devm_free_irq
probe_irq_on
probe_irq_on
register_handler_proc
timecounter_read
timer_list_show
posix_cpu_timer_set
stk5_esdhci_init
load_module
exit_irq_thread
__setup_str_setup_slub_nomerge
__setup_str_setup_slub_nomerge
probe_irq_on
probe_irq_on
register_handler_proc
__xnpod_schedule
xnpipe_recv
rt_task_set_priority
The system is in loop/hangs in rt_task_set_priority.
My system has xenomai 2.5.6 on freescale imx25 arm.
Any ideas ?
If changing the priority of a thread makes that thread preempt the
caller of rt_task_set_priority(), before entering a tight loop
indefinitely, you would see this behavior. Enabling
CONFIG_XENO_OPT_WATCHDOG would likely detect such a case.
Typical bug: not properly handling return codes of Xenomai syscalls in
real-time work loops, such as -EINVAL, -EIDRM, -EINTR or -ETIMEDOUT,
causing the underlying thread to iterate indefinitely on the failing
syscall.
--
Philippe.
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