Segmentation fault when restore

[mrc1119]

Description
criu version: 3.15
OS: CentOS Linux release 7.1.1503 (Core)
kernel: Linux 5.12.4-1.el7.elrepo.x86_64 #1 SMP Fri May 14 06:36:46 EDT 2021 x86_64 x86_64 x86_64 GNU/Linux

Steps to reproduce the issue:
1.dump: ./criu dump --ghost-limit=500M -D /export/sine/dumpdata -j -R -t $pid --tcp-close --skip-in-flight --external mnt[/etc/hosts]:hostsmount --external mnt[/etc/hostname]:hostnamemount --external mnt[/etc/resolv.conf]:reslovemount --external mnt[/var/log/mydb]:mydbmount -v4 -o /export/sine/sinedump.log

2.restore: ./criu restore --ghost-limit=500M -D /export/sine/dumpdata -j -d --tcp-close --root /export/Data/docker/vfs/dir/${containerid} --external mnt[hostsmount]:/etc/hosts --external mnt[hostnamemount]:/etc/hostname --external mnt[reslovemount]:/etc/resolv.conf --external mnt[mydbmount]:/var/log/mydb -v4 -o /export/sine/restore.log

3.There is an error
(03.820187) pie: 1: vdso: image [vdso] 0x7ffe5c5e5000-0x7ffe5c5e7000 [vvar] 0xffffffffffffffff-0xffffffffffffffff
(46.650041) Error (criu/cr-restore.c:1567): 547 killed by signal 11: Segmentation fault
(46.650083) Warn (criu/cr-restore.c:2480): Unable to wait 547: No child processes
(46.650302) mnt: Switching to new ns to clean ghosts
(46.650563) Error (criu/cr-restore.c:2494): Restoring FAILED.

Describe the results you expected:
I have been successful in restoring on other kernel versions, such as 3.10 and 4.18.

Output of `criu check --all`:

Error (criu/util.c:631): exited, status=3 Warn (criu/kerndat.c:877): Can't keep kdat cache on non-tempfs Warn (criu/cr-check.c:850): Dirty tracking is OFF. Memory snapshot will not work. Looks good but some kernel features are missing which, depending on your process tree, may cause dump or restore failure.

I hope I can get your help.

[mrc1119]

This problem was fixed when I updated to version 3.17

[rafaelgieschke]

For other people with the same problem (using older CRIU versions): this was caused by "%zu" in

criu/criu/pie/parasite-vdso.c

Line 162 in d46f40f

pr_info("[%zu]`%s` offset differs: %lx != %lx (rt)\n", i, sym_name, sym_offset, rt_sym_offset);

and was fixed in c39ed51 and b28eb7b for CRIU >= 3.16. If you want to continue using CRIU 3.15, you can sed -i 's/%zu/%zd/' criu/pie/parasite-vdso.c.