RE: [Xen-devel] netback crash with xen3.0.3

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> I am working on a network driver for mini-os, and after creating a lot
> of semi-broken test domains, and a lot of vifs (80 or so), I got dom0
to
> crash like below.
> 
> I have no idea how to reproduce this, just wanted to let people know
> there is a some bug in netback somewhere.

Please could you try and look at the disassembly and figure out which
pointer dereference is causing the problem. Are you using rx-copy or
rx-flip?

Thanks,
Ian


> 
> ========================================================
> 
> (The gnttab errors are due to bugs in my domU code)
> 
> XEN) (file=/mnt/hda3/home/jacobg/xen-evilman5.hg/xen/include/asm/mm.h,
> line=220
> ) Error pfn d95a: rd=ffb04080, od=00000000, caf=00000000, taf=00000000
> (XEN) (file=grant_table.c, line=906) could not get destination frame
> d95a.
> (XEN)
(file=/mnt/hda3/home/jacobg/xen-evilman5.hg/xen/include/asm/mm.h,
> line=220
> ) Error pfn db11: rd=ffb04080, od=00000000, caf=00000000, taf=00000000
> (XEN) (file=grant_table.c, line=906) could not get destination frame
> db11.
> (XEN)
(file=/mnt/hda3/home/jacobg/xen-evilman5.hg/xen/include/asm/mm.h,
> line=220
> ) Error pfn db10: rd=ffb04080, od=00000000, caf=00000000, taf=00000000
> (XEN) (file=grant_table.c, line=906) could not get destination frame
> db10.
> (XEN)
(file=/mnt/hda3/home/jacobg/xen-evilman5.hg/xen/include/asm/mm.h,
> line=220
> ) Error pfn c805: rd=ffb04080, od=00000000, caf=00000000, taf=00000000
> (XEN) (file=grant_table.c, line=906) could not get destination frame
> c805.
> (XEN)
(file=/mnt/hda3/home/jacobg/xen-evilman5.hg/xen/include/asm/mm.h,
> line=220
> ) Error pfn c804: rd=ffb04080, od=00000000, caf=00000000, taf=00000000
> (XEN) (file=grant_table.c, line=906) could not get destination frame
> c804.
> (XEN)
(file=/mnt/hda3/home/jacobg/xen-evilman5.hg/xen/include/asm/mm.h,
> line=220
> ) Error pfn c823: rd=ffb04080, od=00000000, caf=00000000, taf=00000000
> (XEN) (file=grant_table.c, line=906) could not get destination frame
> c823.
> (XEN)
(file=/mnt/hda3/home/jacobg/xen-evilman5.hg/xen/include/asm/mm.h,
> line=220
> ) Error pfn c822: rd=ffb04080, od=00000000, caf=00000000, taf=00000000
> (XEN) (file=grant_table.c, line=906) could not get destination frame
> c822.
> Unable to handle kernel NULL pointer dereference at virtual address
> 0000000c
>  printing eip:
> *pde = ma 00000000 pa fffff000
> Oops: 0000 [#1]
> Modules linked in:
> CPU:    0
> EIP:    0061:[<c026c7a8>]    Not tainted VLI
> EFLAGS: 00010286   (2.6.16.29-xenxen #13)
> EIP is at net_rx_action+0x483/0x897
> eax: 00000001   ebx: 00000000   ecx: 00000000   edx: c0447c60
> esi: cbaafa60   edi: 0000001e   ebp: cd6e8880   esp: c03f9eb0
> ds: 007b   es: 007b   ss: 0069
> Process swapper (pid: 0, threadinfo=c03f8000 task=c039ecc0)
> Stack: <0>000000f9 c03f9f3c c06bc030 00000000 00000000 00000001
00000001
> 0000000
> 0
>        00000000 cbaafa60 00000000 00000000 c03f9f0c c0114593 00000000
> 00000000
>        00000000 00000000 00000000 00000001 00000000 00000001 00000001
> 00000001
> Call Trace:
>  [<c0114593>] __wake_up_common+0x2a/0x4a
>  [<c011b86c>] tasklet_action+0x52/0x8e
>  [<c011b73f>] __do_softirq+0x46/0x99
>  [<c011b7bd>] do_softirq+0x2b/0x48
>  [<c0105bae>] do_IRQ+0x1f/0x25
>  [<c02624cf>] evtchn_do_upcall+0x4f/0x76
>  [<c01046bd>] hypervisor_callback+0x3d/0x48
>  [<c0106c2f>] safe_halt+0x6b/0x84
>  [<c0102bc1>] xen_idle+0x36/0x3d
>  [<c0102c78>] cpu_idle+0x2d/0x42
>  [<c03fa607>] start_kernel+0x26e/0x270
> Code: e0 04 03 44 24 74 f6 40 0c 01 74 3c 8b 44 24 58 6b d0 18 40 89
44
> 24 58 03
>  54 24 6c 66 83 7a 14 00 0f 84 94 00 00 00 8b 4c 24 2c <0f> bf 41 0c
57
> 50 68 f7
>  fb 36 c0 e8 ca b9 ea ff c7 44 24 34 ff
>  <0>Kernel panic - not syncing: Fatal exception in interrupt
>  (XEN) Domain 0 crashed: rebooting machine in 5 seconds.
> 
> 
> 
> 
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