[Barrelfish-users] New release segfault during boot with Simics. Qemu works fine.

[Simon Peter]

I recently got the same problem on a regular machine, booting 
Barrelfish. The problem occurs when the Barrelfish kernel is trying to 
add a large area of memory to the memory-handover CNode (supercn) of the 
init process.

I am not sure whether this has been introduced as a bug in a recent 
release or whether it's always been there. Making the CNode and 
associated data structures larger is an obvious workaround, but it 
should be investigated first, whether there is something wrong with the 
way capabilities are created for large memory regions.

Simon

On 13-03-01 06:38 PM, Mateusz Olczak wrote:
> Hi,
>
> I'm having trouble with segfault below at boot under Simics.
> Same image file works fine under Qemu.
>
> Pagealigned MMAP
> 	0x00000000 - 0x0009f000 Type: 1 Length: 0x9f000
> 	0x0009f000 - 0x000a0000 Type: 2 Length: 0x1000
> 	0x000f0000 - 0x00100000 Type: 2 Length: 0x10000
> 	0x00100000 - 0xdfffd000 Type: 1 Length: 0xdfefd000
> 	0xdfffd000 - 0xe0000000 Type: 2 Length: 0x3000
> 	0xfffc0000 - 0x100000000 Type: 2 Length: 0x40000
> 	0x100000000 - 0x1fff00000 Type: 1 Length: 0xfff00000
> kernel 0: create_caps_to_cnode: Cannot create more caps in CNode
> kernel 0 PANIC! kernel assertion "err_is_ok(err)" failed at ../src/kernel/arch/x86_64/startup_arch.c:412
> kernel 0: exception 3 (error code 0x0): vec_bp: breakpoint
> Faulting instruction pointer (or next instruction): 0xffffff80082861fd
>    => i.e. unrelocated kernel address 0x10f1fd
> Registers:
>   rax: 0xffffff80082a4000  r8 : 0xffffff80000b8fa0
>   rbx: 0x00000001fff00000  r9 : 0x0000000000000000
>   rcx: 0x0000000000000020  r10: 0x0000000000000000
>   rdx: 0xffffff80083392e0  r11: 0xffffffffffffffff
>   rsp: 0xffffff8008b3fe08  r12: 0xffffff800829e600
>   rdi: 0x00000000000003f8  r13: 0xffffff80090ae0a8
>   rsi: 0x000000000000000a  r14: 0x00000000090ae000
>   rip: 0xffffff80082861fd  r15: 0x0000000100000000
> Top o' stack:
>   0 	 0xffffff8008289dbb (18446743524090617275)
>   1 	 0x000000003ff00000 (1072693248)
>   2 	 0xffffff8000000020 (18446743523953737760)
>   3 	 0xffffff8008b3fe70 (18446743524099751536)
>   4 	 0xffffff8008b3fe30 (18446743524099751472)
>   5 	 0xffffff80082b3094 (18446743524090785940)
>   6 	 0xffffff800829cc82 (18446743524090694786)
>   7 	 0xffffff800829a930 (18446743524090685744)
>   8 	 0x000000000000019c (412)
>   9 	 0xffffff80000b8fa0 (18446743523954495392)
> kernel 0: Waiting for GDB connection...
>
> Please see attached file for whole boot log.
>
> Regards,
> // Mateusz
>
>
>
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