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Bug 1739108 - too many thin snaps is causing buffer overflow
Summary: too many thin snaps is causing buffer overflow
Keywords:
Status: CLOSED DUPLICATE of bug 1730503
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: lvm2
Version: 8.1
Hardware: x86_64
OS: Linux
unspecified
medium
Target Milestone: rc
: 8.0
Assignee: LVM and device-mapper development team
QA Contact: cluster-qe@redhat.com
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2019-08-08 13:52 UTC by Roman Bednář
Modified: 2021-09-07 11:51 UTC (History)
8 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2019-08-13 16:36:16 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)

Description Roman Bednář 2019-08-08 13:52:03 UTC 
thin pool stress test is producing dmeventd errors



 ============================================================
 Iteration 1 of 1 started at Wed Aug  7 18:06:08 CEST 2019
 ============================================================
 SCENARIO - [many_thin_snaps]
 Create 1200 virt snapshots of an origin volume and create PVs on each
 Enabling LV scanning
 Recreating VG and PVs to increase metadata size
 Making pool volume
 Converting *Raid* volumes to thin pool and thin pool metadata devices
 lvcreate  --type raid10 -m 1 -i 2  --zero n -L 100M -n meta snapper_thinp
   WARNING: Logical volume snapper_thinp/meta not zeroed.
 lvcreate  --type raid10 -m 1 -i 2  --zero n -L 2G -n POOL snapper_thinp
   WARNING: Logical volume snapper_thinp/POOL not zeroed.
 Waiting until all mirror|raid volumes become fully syncd...
    2/2 mirror(s) are fully synced: ( 100.00% 100.00% )
 Sleeping 15 sec
 Sleeping 15 sec
 lvconvert --zero n --thinpool snapper_thinp/POOL --poolmetadata meta --yes
   WARNING: Converting snapper_thinp/POOL and snapper_thinp/meta to thin pool's data and metadata volumes with metadata wiping.
   THIS WILL DESTROY CONTENT OF LOGICAL VOLUME (filesystem etc.)
   device-mapper: remove ioctl on  (253:10) failed: Device or resource busy
 
 Sanity checking pool device (POOL) metadata
 thin_check /dev/mapper/snapper_thinp-meta_swap.632
 examining superblock
 examining devices tree
 examining mapping tree
 checking space map counts
 
 Making origin volume
 lvcreate  --virtualsize 2G -T snapper_thinp/POOL -n origin
 lvcreate  -V 2G -T snapper_thinp/POOL -n other1
   WARNING: Sum of all thin volume sizes (4.00 GiB) exceeds the size of thin pool snapper_thinp/POOL (2.00 GiB).
 lvcreate  -V 2G -T snapper_thinp/POOL -n other2
   WARNING: Sum of all thin volume sizes (6.00 GiB) exceeds the size of thin pool snapper_thinp/POOL (2.00 GiB).
 lvcreate  -V 2G -T snapper_thinp/POOL -n other3
   WARNING: Sum of all thin volume sizes (8.00 GiB) exceeds the size of thin pool snapper_thinp/POOL (2.00 GiB).
 lvcreate  --virtualsize 2G -T snapper_thinp/POOL -n other4
   WARNING: Sum of all thin volume sizes (10.00 GiB) exceeds the size of thin pool snapper_thinp/POOL (2.00 GiB).
 lvcreate  --virtualsize 2G -T snapper_thinp/POOL -n other5
   WARNING: Sum of all thin volume sizes (12.00 GiB) exceeds the size of thin pool snapper_thinp/POOL (2.00 GiB).
 Making 1200 snapshots of origin volume
 1 lvcreate  -y -k n -s /dev/snapper_thinp/origin -n many_1
 2 lvcreate  -y -k n -s /dev/snapper_thinp/origin -n many_2
 3 lvcreate  -y -k n -s /dev/snapper_thinp/origin -n many_3
.
.
.
.
.
.
 1005 lvcreate  -y -k n -s /dev/snapper_thinp/origin -n many_1005
 1006 lvcreate  -y -k n -s /dev/snapper_thinp/origin -n many_1006
   bcache no new blocks for fd 183 index 16383
 1007 lvcreate  -y -k n -s /dev/snapper_thinp/origin -n many_1007
 1008 lvcreate  -y -k n -s /dev/snapper_thinp/origin -n many_1008
   bcache no new blocks for fd 686 index 16383
 1009 lvcreate  -y -k n -s /dev/snapper_thinp/origin -n many_1009
 1010 lvcreate  -y -k n -s /dev/snapper_thinp/origin -n many_1010
 Although the snap create passed, errors were found in it's output
   WARNING: You have not turned on protection against thin pools running out of space.
   WARNING: Set activation/thin_pool_autoextend_threshold below 100 to trigger automatic extension of thin pools before they get full.
   WARNING: Sum of all thin volume sizes (1.98 TiB) exceeds the size of thin pool snapper_thinp/POOL and the size of whole volume group (<206.53 GiB).
   /run/dmeventd-client: open failed: Too many open files
   WARNING: Failed to monitor snapper_thinp/POOL_tdata.
   /run/dmeventd-client: open failed: Too many open files
   WARNING: Failed to monitor snapper_thinp/POOL_tmeta.
   /run/dmeventd-client: open failed: Too many open files
   WARNING: Failed to monitor snapper_thinp/POOL.
   Logical volume "many_1010" created.


kernel-4.18.0-128.el8.x86_64
lvm2-2.03.05-2.el8.x86_64
device-mapper-1.02.163-2.el8.x86_64
Comment 3 Corey Marthaler 2019-08-13 16:36:16 UTC 

*** This bug has been marked as a duplicate of bug 1730503 ***
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