[CRIU] checkpoint/restore of an 32bit application on arm64

[Cyrill Gorcunov]

On Mon, Oct 15, 2018 at 2:55 PM andi <andi.platschek at gmail.com> wrote:

> Hi all,
>
>
Hi, really sorry for delay in response.


> over the weekend I got it to a point where I can actually dump+restore a
> 32bit application in my
> 64bit arm (with 32bit criu). HOWEVER the application that I am able to
> dump is very minimalistic:
>
> int main(int argc, char* argv[])
> {
>          int count;
>
>          while (1) {
>                  count++;
>          }
> }
>
> as soon as I add a library call in the loop, the restored application
> crashes:
>
> [  256.988318] hello[1931]: unhandled level 3 translation fault (11) at
> 0x00000000, esr 0x82000007
> [  256.988321] pgd = ffff80083d2a2000
> [  256.988323] [00000000] *pgd=000000083d2a3003
> [  256.988325] , *pud=000000083d2a4003
> [  256.988326] , *pmd=000000083d2a5003
> [  256.988328] , *pte=0000000000000000
> [  256.988329]
> [  256.988330]
> [  256.988335] CPU: 0 PID: 1931 Comm: hello Not tainted 4.9.0-artech #108
> [  256.988337] Hardware name: rwzweiCAB4GS08W001p01_f_f (DT)
> [  256.988339] task: ffff80087017e000 task.stack: ffff80083ca74000
> [  256.988343] PC is at 0x0
> [  256.988345] LR is at 0xf7572d40
> [  256.988347] pc : [<0000000000000000>] lr : [<00000000f7572d40>] pstate:
> 00000010
> [  256.988348] sp : 00000000ffc39db0
> [  256.988350] x12: 00000000000f4240
> [  256.988352] x11: 00000000ffc39dd4 x10: 00000000f7616fac
> [  256.988356] x9 : 0000000000000000 x8 : 0000000000000000
> [  256.988360] x7 : 0000000000000000 x6 : 0000000000010348
> [  256.988363] x5 : 0000000000000000 x4 : 0000000000000000
> [  256.988367] x3 : 0000000000000000 x2 : 00000000000003e8
> [  256.988370] x1 : 0000000000000000 x0 : 0000000000000000
> [  256.988373]
>
>
This sigsegv is due to lack of page data. I know quite a little about arm64
implementation thus we need someone from arm64 camp to help you debug this
problem.
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