Hi Marian,
I have a lvm failure below when creating a lot of thin snapshot LVs for containers as rootfs.
```
*** buffer overflow detected ***: lvcreate terminated\n======= Backtrace: =========\n/lib64/libc.so.6(__fortify_fail+0x37)[0x7f192c2389e7]\n/lib64/libc.so.6(+0x115b62)[0x7f192c236b62]\n/lib64/libc.so.6(+0x117947)[0x7f192c238947]\n/lib64/libdevmapper-event.so.1.02(+0x21db)[0x7f192cfd21db]\n/lib64/libdevmapper-event.so.1.02(daemon_talk+0xb5)[0x7f192cfd2a55]\n/lib64/libdevmapper-event.so.1.02(+0x331b)[0x7f192cfd331b]\n/lib64/libdevmapper-event.so.1.02(dm_event_get_registered_device+0x77)[0x7f192cfd3a47]\nlvcreate(monitor_dev_for_events+0x3cc)[0x556ec3b5d75c]\nlvcreate(monitor_dev_for_events+0x2ee)[0x556ec3b5d67e]\nlvcreate(lv_suspend_if_active+0x6cc)[0x556ec3b5f25c]\nlvcreate(+0x14196d)
```
My LVM version:
```
#lvm version
LVM version: 2.02.180(2)-RHEL7 (2018-07-20)
Library version: 1.02.149-RHEL7 (2018-07-20)
Driver version: 4.35.0
```
I see you recently pushed this patch, looks like a fix for such problem:
```
commit fdb6ef8a85e9adc4805202b3200b17bd3b351982
Author: Marian Csontos <mcsontos@xxxxxxxxxx>
Date: Thu Jun 21 10:20:09 2018 +0200
libdm: fix buffer overflow
(cherry picked from commit 8a0af1bec882de66677e1a0cdceff841c39f92b0)
```
May I ask your help for some confirmation?
- how can we reproduce this problem?
- do you think this patch can fix my problem?
Thanks in advance!
Eric
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