Nils Kemper wrote: > Hi, > I want to use Xenomai, but I get (sometimes, but everytime the same) > kernel-Oops just by running xeno-test: > > [..] > Xenomai: stopping native API services. > I-pipe: Domain Xenomai unregistered. > Xenomai: hal/x86 stopped. > Xenomai: real-time nucleus unloaded. > Unable to handle kernel NULL pointer dereference at virtual address 00000000 > printing eip: > 00000000 > *pde = 00000000 > Oops: 0000 [#1] > PREEMPT > Modules linked in: netconsole 8139too crc32 ipv6 nfs lockd sunrpc > intel_agp ehci_hcd uhci_hcd usbcore i810_audio ac97_codec soundcore 3c59x > mii agpgart > CPU: 0 > EIP: 0060:[<00000000>] Not tainted VLI > EFLAGS: 00010246 (2.6.16.27n-xeno222 #7) > EIP is at rest_init+0x3feffde0/0x63 > eax: c030ba80 ebx: c030ba80 ecx: 00000002 edx: 00000003 > esi: c030ba80 edi: 00000246 ebp: 00000021 esp: cc1bbf80 > ds: 007b es: 007b ss: 0068 > Process dd (pid: 11490, threadinfo=cc1ba000 task=d56f8a70) > Stack: <0>c013f158 00000021 c030ba80 cc1bbfbc 00000001 c0314408 c030ba80 > cc1bbfbc > 00000000 00000200 08051000 cc1ba000 c0111c3d 00000000 c0102ec6 > 00000000 > 08051000 00000200 00000200 08051000 bfda2568 00000003 0000007b > 0000007b > Call Trace: > [<c013f158>] __ipipe_dispatch_event+0xcd/0xeb > [<c0111c3d>] __ipipe_syscall_root+0x2f/0xd8 > [<c0102ec6>] sysenter_past_esp+0x3b/0x67 > Code: Bad EIP value. > <4>I-pipe: Domain Xenomai registered. > Xenomai: hal/x86 started. > Xenomai: real-time nucleus v2.2.2 (Ride) loaded. > Xenomai: SMI-enabled chipset found, enabling SMI workaround. > [..] > > I'm sure somthing is wrong with my kernel-config, so I have attached it, > together with the xeno-test-output. > BTW: I tried noapic, acpi=off with no success.
Looks like a cleanup race in the nucleus unloading code. I just got it here as well after adoption to your .config (all modularised, CONFIG_PREEMPT). It basically seems to melt down to having high syscall load (e.g. dd if=/dev/zero of=/dev/null) during nucleus unload. Unless someone around immediately has an idea why some syscall traps onto a NULL pointer (or something else - I had non-NULL address here), I would try to get this over a debugging environment "later". Hope the bug is not too volatile... Thanks for reporting so precisely! Jan
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