Bug 1358090
| Summary: | shared memory leakage in vncviewer | ||||||
|---|---|---|---|---|---|---|---|
| Product: | Red Hat Enterprise Linux 7 | Reporter: | Tsukahara Ken <tsukahara.ken> | ||||
| Component: | tigervnc | Assignee: | Jan Grulich <jgrulich> | ||||
| Status: | CLOSED ERRATA | QA Contact: | Desktop QE <desktop-qa-list> | ||||
| Severity: | medium | Docs Contact: | |||||
| Priority: | unspecified | ||||||
| Version: | 7.2 | CC: | tpelka | ||||
| Target Milestone: | rc | ||||||
| Target Release: | --- | ||||||
| Hardware: | All | ||||||
| OS: | Linux | ||||||
| Whiteboard: | |||||||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |||||
| Doc Text: | Story Points: | --- | |||||
| Clone Of: | Environment: | ||||||
| Last Closed: | 2017-08-01 20:50:05 UTC | Type: | Bug | ||||
| Regression: | --- | Mount Type: | --- | ||||
| Documentation: | --- | CRM: | |||||
| Verified Versions: | Category: | --- | |||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||
| Embargoed: | |||||||
| Bug Depends On: | |||||||
| Bug Blocks: | 1393395 | ||||||
| Attachments: |
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Should be already fixed in upstream, granting dev_ack. OK. I just have sent a pull-request in the github. https://github.com/TigerVNC/tigervnc/pull/402 Perfect, I actually meant that it's already fixed in upstream, but apparently I was looking into something else. Thanks. It just has been merged into upstream. https://github.com/TigerVNC/tigervnc/pull/402 Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHSA-2017:2000 |
Created attachment 1181888 [details] workaround Description of problem: vncviewer creates a shared memory segment for MIT-SHM. It is not removed when vncviewer is killed by signal. Version-Release number of selected component (if applicable): tigervnc-1.3.1-4.el7_2.x86_64 How reproducible: Always Steps to Reproduce: 1. Check initial shared memory information. $ ipcs -m ------ Shared Memory Segments -------- key shmid owner perms bytes nattch status 0x011456ac 0 root 600 1000 6 0x00000000 229377 user1 600 524288 2 dest 0x00000000 262146 user1 600 4194304 2 dest 0x00000000 360451 user1 600 4194304 2 dest 0x00000000 458758 user1 600 4194304 2 dest 2. Run vncviewer. -display to local Xorg(using MIT-SHM). $ vncviewer -display :0.0 192.168.0.100:5900 3. Check shared memory information. shmid 753668 is created and attached. $ ipcs -m ------ Shared Memory Segments -------- key shmid owner perms bytes nattch status 0x011456ac 0 root 600 1000 6 0x00000000 229377 user1 600 524288 2 dest 0x00000000 262146 user1 600 4194304 2 dest 0x00000000 360451 user1 600 4194304 2 dest 0x00000000 753668 user1 777 5242880 2 0x00000000 458758 user1 600 4194304 2 dest 4. Kill the vncviewer by SIGTERM (or SIGINT). $ killall vncviewer Actual results: shmid 753668 still exists. $ ipcs -m ------ Shared Memory Segments -------- key shmid owner perms bytes nattch status 0x011456ac 0 root 600 1000 6 0x00000000 229377 user1 600 524288 2 dest 0x00000000 262146 user1 600 4194304 2 dest 0x00000000 360451 user1 600 4194304 2 dest 0x00000000 753668 user1 777 5242880 0 0x00000000 458758 user1 600 4194304 2 dest Expected results: shmid 753668 should be removed. $ ipcs -m ------ Shared Memory Segments -------- key shmid owner perms bytes nattch status 0x011456ac 0 root 600 1000 6 0x00000000 229377 user1 600 524288 2 dest 0x00000000 262146 user1 600 4194304 2 dest 0x00000000 360451 user1 600 4194304 2 dest 0x00000000 458758 user1 600 4194304 2 dest Additional info: PlatformPixelBuffer destructor is never called after CleanupSignalHandler(). Workaround: Mark the shared memory as "destroyed" as soon as possible. It will be invisible soon after the vncviewer is killed. See attachment.