fyi, I tested the simple loop (https://criu.org/Simple_loop) on an
artful system w/ a 4.12 kernel. While save & restore both exited w/ 0
status, the restored binary crashed:

[177195.809070] test.sh[35106]: unhandled level 2 translation fault (11) at 
0xffffa0d826c0, esr 0x82000006
[177195.809074] pgd = ffff801f69cac000
[177195.812634] [ffffa0d826c0] *pgd=0000001f6b3aa003, *pud=0000001f4e855003, 
*pmd=0000000000000000
[177195.821452] CPU: 20 PID: 35106 Comm: test.sh Not tainted 4.12.0-10-generic 
#11-Ubuntu
[177195.821454] Hardware name: Cavium ThunderX CRB/To be filled by O.E.M., BIOS 
5.11 12/12/2012
[177195.821457] task: ffff801f46238000 task.stack: ffff801f65444000
[177195.821461] PC is at 0xffffa0d826c0
[177195.821464] LR is at 0xffffa0d826c0
[177195.821466] pc : [<0000ffffa0d826c0>] lr : [<0000ffffa0d826c0>] pstate: 
60000000
[177195.821468] sp : 0000ffffc2ec3370
[177195.821470] x29: 0000ffffc2ec45c0 x28: 0000000123751000 
[177195.821475] x27: 0000000123754b40 x26: 00000001529cc4b0 
[177195.821480] x25: 0000ffffc2ec464c x24: 0000000000000000 
[177195.821485] x23: 0000000123751000 x22: 0000000123751000 
[177195.821490] x21: 0000000123751000 x20: 00000001529cc4b0 
[177195.821495] x19: 0000000000000001 x18: 0000000123752000 
[177195.821500] x17: 0000000123751000 x16: 0000000123751b10 
[177195.821505] x15: 0000000000000000 x14: 0000000123751000 
[177195.821510] x13: 0000000000000000 x12: 0000000123751000 
[177195.821515] x11: 0000000000000000 x10: 0000000000000000 
[177195.821520] x9 : 0000000000000000 x8 : 0000000000000104 
[177195.821525] x7 : 0000000000000000 x6 : 0000000000000001 
[177195.821530] x5 : 0000000123751000 x4 : 0000000000000000 
[177195.821535] x3 : 0000000000000000 x2 : 0000000123754c70 
[177195.821540] x1 : 00000001237523f0 x0 : 0000000000000011

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https://bugs.launchpad.net/bugs/1709920

Title:
  criu is not built for arm64

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