Re: [Qemu-devel] Crash when running hello-world unikernel for ARM

["Alex Bennée" <alex.bennee@linaro.org>]

Ajay Garg <ajaygargnsit@gmail.com> writes:

>>
>> qemu-system-x86_64 is expecting an x86 binary blob. I assume you need
>> qemu-system-arm. More importantly you need to specify a -M machine type
>> that matches whatever rumprun is expecting.
>>
>
> Oops, sorry my bad.
> Here is the updated status :
>
> ajay@latitude-3480:~/rumprun-arm-hw/rumprun$ qemu-system-arm -machine
> virt -nographic -nographic -kernel helloer.bin
> Bad ram pointer 0x1e8
> Aborted (core dumped)

Can you run under -s -S and gdb step the *guest* and see where it ends
up. The above error is usually indicative of the guest going off into
the weeds somewhere because the hardware isn't what it expects.

>
>
> ajay@latitude-3480:~/rumprun-arm-hw/rumprun$ gdb --args
> qemu-system-arm -machine virt -nographic -nographic -kernel
> helloer.bin
> GNU gdb (Ubuntu 7.11.1-0ubuntu1~16.5) 7.11.1
> Copyright (C) 2016 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
> and "show warranty" for details.
> This GDB was configured as "x86_64-linux-gnu".
> Type "show configuration" for configuration details.
> For bug reporting instructions, please see:
> <http://www.gnu.org/software/gdb/bugs/>.
> Find the GDB manual and other documentation resources online at:
> <http://www.gnu.org/software/gdb/documentation/>.
> For help, type "help".
> Type "apropos word" to search for commands related to "word"...
> Reading symbols from qemu-system-arm...(no debugging symbols found)...done.
> (gdb) r
> Starting program: /usr/bin/qemu-system-arm -machine virt -nographic
> -nographic -kernel helloer.bin
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
> [New Thread 0x7fffecc88700 (LWP 14033)]
> [New Thread 0x7fffd21fc700 (LWP 14034)]
> Bad ram pointer 0x1e8
>
> Thread 3 "qemu-system-arm" received signal SIGABRT, Aborted.
> [Switching to Thread 0x7fffd21fc700 (LWP 14034)]
> 0x00007ffff2a1b428 in __GI_raise (sig=sig@entry=6) at
> ../sysdeps/unix/sysv/linux/raise.c:54
> 54    ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
> (gdb) bt
> #0  0x00007ffff2a1b428 in __GI_raise (sig=sig@entry=6) at
> ../sysdeps/unix/sysv/linux/raise.c:54
> #1  0x00007ffff2a1d02a in __GI_abort () at abort.c:89
> #2  0x00005555557687f1 in get_page_addr_code ()
> #3  0x000055555572d50c in ?? ()
> #4  0x000055555572e11b in cpu_arm_exec ()
> #5  0x0000555555750252 in ?? ()
> #6  0x00007ffff2db76ba in start_thread (arg=0x7fffd21fc700) at
> pthread_create.c:333
> #7  0x00007ffff2aed41d in clone () at
> ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
> (gdb)
>
>
> Thanks and Regards,
> Ajay


--
Alex Bennée