Re: [Xenomai-core] Xenomai v2.4-rc4: freeze with RTAI skin, fine with other skins
Philippe Gerum wrote: [...] This rounding was missing too. We need the previous one for kernel local heaps, and the one below to meet the stricter PAGE_SIZE constraint for shareable heaps. --- ksrc/nucleus/heap.c(revision 3095) +++ ksrc/nucleus/heap.c(working copy) @@ -1103,7 +1103,7 @@ spl_t s; int err; - heapsize = PAGE_ALIGN(heapsize); + heapsize = xnheap_rounded_size(heapsize, PAGE_SIZE); heapbase = __alloc_and_reserve_heap(heapsize, memflags); if (!heapbase) Nope, still doesn't in -rc5 :-( Most probably because it should be at least _2_ times the page size. The following patch missed the -rc5, can it please make it for -rc6? --- ksrc/skins/rtai/task.c 29 Oct 2007 08:45:27 - 1.3 +++ ksrc/skins/rtai/task.c 30 Oct 2007 15:04:08 - @@ -139,6 +139,9 @@ task-body = body; task-sigfn = sigfn; + if (xnarch_cpus_empty(task-affinity)) + task-affinity = XNPOD_ALL_CPUS; + xnlock_get_irqsave(nklock, s); err = xnpod_start_thread(task-thread_base, XNSUSP,/* Suspend on startup. */ -- Stephane ___ Xenomai-core mailing list Xenomai-core@gna.org https://mail.gna.org/listinfo/xenomai-core
Re: [Xenomai-core] Xenomai v2.4-rc4: freeze with RTAI skin, fine with other skins
Fillod Stephane wrote: Philippe Gerum wrote: [...] This rounding was missing too. We need the previous one for kernel local heaps, and the one below to meet the stricter PAGE_SIZE constraint for shareable heaps. --- ksrc/nucleus/heap.c (revision 3095) +++ ksrc/nucleus/heap.c (working copy) @@ -1103,7 +1103,7 @@ spl_t s; int err; -heapsize = PAGE_ALIGN(heapsize); +heapsize = xnheap_rounded_size(heapsize, PAGE_SIZE); heapbase = __alloc_and_reserve_heap(heapsize, memflags); if (!heapbase) Nope, still doesn't in -rc5 :-( Most probably because it should be at least _2_ times the page size. Damnit. Half of the logic is indeed missing. Ok, will re-re-re-fix, ... the fix. The following patch missed the -rc5, can it please make it for -rc6? Yes. Thanks. --- ksrc/skins/rtai/task.c29 Oct 2007 08:45:27 - 1.3 +++ ksrc/skins/rtai/task.c30 Oct 2007 15:04:08 - @@ -139,6 +139,9 @@ task-body = body; task-sigfn = sigfn; + if (xnarch_cpus_empty(task-affinity)) + task-affinity = XNPOD_ALL_CPUS; + xnlock_get_irqsave(nklock, s); err = xnpod_start_thread(task-thread_base, XNSUSP,/* Suspend on startup. */ -- Philippe. ___ Xenomai-core mailing list Xenomai-core@gna.org https://mail.gna.org/listinfo/xenomai-core
Re: [Xenomai-core] Xenomai v2.4-rc4: freeze with RTAI skin, fine with other skins
Fillod Stephane wrote: Philippe Gerum wrote: Fillod Stephane wrote: For the legacy RTAI application to load, the attached patch was necessary. The patch against ksrc/skins/rtai/shm.c is somewhat defeating the purpose of a lower XNCORE_PAGE_SIZE, so a better fix might be expected. This one should prevent -EINVAL from being returned. Hopefully. Nope, it doesn't :-( Most probably because still (hdrsize + 2 * pagesize heapsize). This rounding was missing too. We need the previous one for kernel local heaps, and the one below to meet the stricter PAGE_SIZE constraint for shareable heaps. --- ksrc/nucleus/heap.c (revision 3095) +++ ksrc/nucleus/heap.c (working copy) @@ -1103,7 +1103,7 @@ spl_t s; int err; - heapsize = PAGE_ALIGN(heapsize); + heapsize = xnheap_rounded_size(heapsize, PAGE_SIZE); heapbase = __alloc_and_reserve_heap(heapsize, memflags); if (!heapbase) -- Philippe. ___ Xenomai-core mailing list Xenomai-core@gna.org https://mail.gna.org/listinfo/xenomai-core
Re: [Xenomai-core] Xenomai v2.4-rc4: freeze with RTAI skin, fine with other skins
Philippe Gerum wrote: Fillod Stephane wrote: For the legacy RTAI application to load, the attached patch was necessary. The patch against ksrc/skins/rtai/shm.c is somewhat defeating the purpose of a lower XNCORE_PAGE_SIZE, so a better fix might be expected. This one should prevent -EINVAL from being returned. Hopefully. Nope, it doesn't :-( Most probably because still (hdrsize + 2 * pagesize heapsize). [..] In the mean time, does anyone have a clue where to look particularly? Hard to say at this point. Since the nucleus watchdog does not trigger, you may want to try disabling X86_UP_IOAPIC while keeping X86_UP_APIC, and arm the kernel NMI watchdog on the LAPIC (nmi_watchdog=2). You may be lucky and have a backtrace after the freeze. PS: maybe enabling all the nucleus debug options would catch something too. Thanks for the ideas. It looks like part of the problem came from memory corruption (access beyond heap) in the application (not so stable app in the end, he!). I'm still experiencing random freeze when freeing resources when stopping application, but runtime is stable. To be honest, the freeze was not a perfect freeze, I got just a one line trace from do_page_fault(), with no backtrace or pointer. Unhelpful. I have updated http://xenomai.org/index.php/FAQs -- Stephane ___ Xenomai-core mailing list Xenomai-core@gna.org https://mail.gna.org/listinfo/xenomai-core
Re: [Xenomai-core] Xenomai v2.4-rc4: freeze with RTAI skin, fine with other skins
On 10/22/07, Fillod Stephane [EMAIL PROTECTED] wrote: In the mean time, does anyone have a clue where to look particularly? A case of freeze is a system call called in a loop which fails without its return value being checked. -- Gilles Chanteperdrix ___ Xenomai-core mailing list Xenomai-core@gna.org https://mail.gna.org/listinfo/xenomai-core
Re: [Xenomai-core] Xenomai v2.4-rc4: freeze with RTAI skin, fine with other skins
Hi Gilles, Thanks for the quick reply. Gilles Chanteperdrix wrote: A case of freeze is a system call called in a loop which fails without its return value being checked. I forget to say that the RTAI application is running in kernel land, because no port of the RTAI skin has been made yet to user land (in fact, only shm access). So, can it still be a system call in a loop issue? Besides, the xeno watchdog is not kicking. Once freezed, the box does not respond to ping, so this is not a SCHED_FIFO task stuck either. Still searching.. -- Stephane ___ Xenomai-core mailing list Xenomai-core@gna.org https://mail.gna.org/listinfo/xenomai-core
Re: [Xenomai-core] Xenomai v2.4-rc4: freeze with RTAI skin, fine with other skins
Fillod Stephane wrote: Hi, As Philippe has been suggesting it, I've been testing v2.4-rc4 on x86 (not favourite board though :) with the RTAI skin (not my favourite skin too). Anyway, a legacy RTAI application which was fine with v2.3.2/2.6.20, is now freezing the box randomly in the first 30 seconds. On the other hand, the programs from the testsuite are running stable. So we may rule out a problem in the I-Pipe/kernel. For the legacy RTAI application to load, the attached patch was necessary. The patch against ksrc/skins/rtai/shm.c is somewhat defeating the purpose of a lower XNCORE_PAGE_SIZE, so a better fix might be expected. This one should prevent -EINVAL from being returned. Hopefully. --- ksrc/skins/rtai/shm.c (revision 3095) +++ ksrc/skins/rtai/shm.c (working copy) @@ -150,8 +150,7 @@ /* Account for the overhead so that the actual free space is large enough to match the requested size. */ - heapsize += xnheap_overhead(heapsize, XNCORE_PAGE_SIZE); - heapsize = XNCORE_PAGE_ALIGN(heapsize); + heapsize = xnheap_rounded_size(heapsize, XNCORE_PAGE_SIZE); #ifdef CONFIG_XENO_OPT_PERVASIVE err = xnheap_init_mapped(p-heap, The box is running FC5 on a pentium D, but kernel is compiled for UP. $ cat /proc/ipipe/version 1.10-09 $ cat /proc/xenomai/version 2.4-rc4 $ cat /proc/version Linux version 2.6.23.1 () (gcc version 4.1.1 20070105 (Red Hat 4.1.1-51)) The kernel config file is attached. I'm currently stripping down the RTAI code out of the application in order to have a simple testbed reproducing the freeze. In the mean time, does anyone have a clue where to look particularly? Hard to say at this point. Since the nucleus watchdog does not trigger, you may want to try disabling X86_UP_IOAPIC while keeping X86_UP_APIC, and arm the kernel NMI watchdog on the LAPIC (nmi_watchdog=2). You may be lucky and have a backtrace after the freeze. PS: maybe enabling all the nucleus debug options would catch something too. TIA ___ Xenomai-core mailing list Xenomai-core@gna.org https://mail.gna.org/listinfo/xenomai-core -- Philippe. ___ Xenomai-core mailing list Xenomai-core@gna.org https://mail.gna.org/listinfo/xenomai-core
Re: [Xenomai-core] Xenomai v2.4-rc4: freeze with RTAI skin, fine with other skins
Fillod Stephane wrote: Hi Gilles, Thanks for the quick reply. Gilles Chanteperdrix wrote: A case of freeze is a system call called in a loop which fails without its return value being checked. I forget to say that the RTAI application is running in kernel land, because no port of the RTAI skin has been made yet to user land (in fact, only shm access). So, can it still be a system call in a loop issue? Besides, the xeno watchdog is not kicking. Once freezed, the box does not respond to ping, so this is not a SCHED_FIFO task stuck either. Still searching.. Stack space overflow issue now biting some real-time kernel thread? Spurious delay/timeout values computed by the application (specifically: too short), as a side-effect of the timebase introduction? -- Philippe. ___ Xenomai-core mailing list Xenomai-core@gna.org https://mail.gna.org/listinfo/xenomai-core
Re: [Xenomai-core] Xenomai v2.4-rc4: freeze with RTAI skin, fine with other skins
On 10/22/07, Fillod Stephane [EMAIL PROTECTED] wrote: Hi Gilles, Thanks for the quick reply. Gilles Chanteperdrix wrote: A case of freeze is a system call called in a loop which fails without its return value being checked. I forget to say that the RTAI application is running in kernel land, because no port of the RTAI skin has been made yet to user land (in fact, only shm access). So, can it still be a system call in a loop issue? Besides, the xeno watchdog is not kicking. Once freezed, the box does not respond to ping, so this is not a SCHED_FIFO task stuck either. Still searching.. I meant to say a blocking call. But you are right, in this case the watchdog would trigger. -- Gilles Chanteperdrix ___ Xenomai-core mailing list Xenomai-core@gna.org https://mail.gna.org/listinfo/xenomai-core
