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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.
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