[CRIU] Questions in CRIU restore mechanism.

[Chanho Park]

> I tried to dump our simple 'clock' application.
> I've got below error during the dump process.
> How do we deal with the process which has shmem?
> 
> (00.042692) Found anon-shmem piggie at 4
> (00.044305) Error (proc_parse.c:310): Can't handle non-regular mapping on
> 3850's map 2920849408
> (00.044417) Error (cr-dump.c:1367): Collect mappings (pid: 3850) failed
> with -1
> 

This error was caused due to /dev/ump and /dev/mali device node which are related with mali gpu device.
So, I passed it temporarily.

The next error was produced by /dev/console.

Parasite cmd 11/0xb process
(00.310244) 3610 fdinfo 0: pos: 0x               0 flags:           400000/0
(00.310466) Dumping path for 0 fd via self 759 [/dev/null]
(00.310609) fdinfo: type: 0x 1 flags: 0400000/0 pos: 0x       0 fd: 0
(00.310684) 3610 fdinfo 1: pos: 0x        ffffffff flags:                2/0
(00.310743) tty: Dumping tty 760 with id 0x2
(00.310811) Error (tty.c:203): tty: Can't obtain ptmx index
: Inappropriate ioctl for device
(00.310933) ----------------------------------------
(00.310962) Error (cr-dump.c:1419): Dump files (pid: 3610) failed with -1

The serial node can't supports GIOCGPTN ioctl.
I think only unix-ptmx node will support it.
How about you think this problem?

There are also some problem to dump character devices.
dump_chrdev supports only MEM_MAJOR and TTY types.
To dump any other character device types, we need to implement for that device. Right?

Best regards,
Chanho Park