[CRIU] Parasite code is not executed

[Vitaliy Kharin]

Hi all!
I am using
Linux 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt7-1 (2015-03-01) x86_64 GNU/Linux

sudo ./criu check --ms
Warn  (cr-check.c:188): Skipping unssuported PR_SET_MM_MAP
Warn  (tun.c:58): Skipping tun support check
Warn  (timerfd.c:44): timerfd: Skipping timerfd support check
Warn  (cr-check.c:296): Skipping mnt_id support check
Warn  (cr-check.c:668): Skipping unsupported AIO remap
Looks good.

A tried to dump my app:
sudo criu dump -t PID -vvv -o dump.log && echo OK

Process PID stopped but exists, 'OK' is not printed

Tail of dump.log contains:
(00.040686) Putting parasite blob into 0x7f4451fd2000->0x7f087a105000
(00.040705) Dumping GP/FPU registers for 10935
(00.040713) Putting tsock into pid 10935

I found out that criu is blocked on an accept call:
static int accept_tsock(struct parasite_ctl *ctl)
...
sock = accept(ask, NULL, 0);

Seems to be parasite code inside of dumpee  did not create connection.
Could you assist me to find out the cause?

Regards,
Vitaliy Kharin