It might have been fixed in a series of changes made in mutter (future
version) 3.26.3. It's just unusual and unexpected that Gnome has not
done a release for months, so we have not yet tried those fixes.
Instead, it looks like we will jump to 3.28 now, soon. So if bionic goes
well with 3.28 then we will seriously consider backporting the leak
fixes to artful.
This is also one of those bugs that could be subjective. A fix that
works for one person might not work for the next. So I guess in order to
make sure everyone is on the same page, please ensure you have not
installed any Gnome Shell extensions beyond the default Ubuntu ones.
Because we don't want to get caught up debugging a gnome-shell extension
that most people don't use.

P.S. I stopped working on this bug because I stopped being able to
reproduce it.

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https://bugs.launchpad.net/bugs/1672297

Title:
  gnome-shell uses lots of memory, and grows over time

Status in GNOME Shell:
  Unknown
Status in Mutter:
  Fix Released
Status in gnome-shell package in Ubuntu:
  Triaged
Status in mutter package in Ubuntu:
  Triaged

Bug description:
  gnome-shell's RSS is growing by 1 MiB every few minutes, and is now at
  almost 2 GiB.

  user      3039  1.8 16.1 4302340 1968476 tty2  Sl+  Mar09 120:17
  /usr/bin/gnome-shell

  strace output is voluminous; here is a representative sample:

  poll([{fd=5, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=5, revents=POLLOUT}])
  writev(5, [{"\231\n\10\0\n\0 
\0\0\0\0\0\0\0\0\0\0\0\0\0\1\0\0\0\0\0\0\0\0\0\0\0", 32}], 1) = 32
  poll([{fd=5, events=POLLIN}], 1, -1)    = 1 ([{fd=5, revents=POLLIN}])
  recvmsg(5, {msg_name(0)=NULL, 
msg_iov(1)=[{"\1\0{\224\0\0\0\0H\0\0\0\0\23\266\32\0\0\0\0\201\242\204\0\0\0\0\0\261.\0\0",
 4096}], msg_controllen=0, msg_flags=0}, 0) = 32
  recvmsg(5, 0x7fff60efac90, 0)           = -1 EAGAIN (Resource temporarily 
unavailable)
  recvmsg(5, 0x7fff60efac90, 0)           = -1 EAGAIN (Resource temporarily 
unavailable)
  poll([{fd=5, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=5, revents=POLLOUT}])
  writev(5, [{"\212\5\4\0a\2228\0y\3\5\0%\3\27\4\231\6\5\0\n\0 
\0a\2228\0\0\0\0\0"..., 36}, {NULL, 0}, {"", 0}], 3) = 36
  poll([{fd=5, events=POLLIN}], 1, -1)    = 1 ([{fd=5, revents=POLLIN}])
  recvmsg(5, {msg_name(0)=NULL, 
msg_iov(1)=[{"\1\0}\224\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0",
 4096}], msg_controllen=0, msg_flags=0}, 0) = 32
  recvmsg(5, 0x7fff60efac90, 0)           = -1 EAGAIN (Resource temporarily 
unavailable)
  poll([{fd=5, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=5, revents=POLLOUT}])
  writev(5, [{"\212\n\2\0a\2228\0", 8}, {NULL, 0}, {"", 0}], 3) = 8
  recvmsg(5, 0x7fff60efb020, 0)           = -1 EAGAIN (Resource temporarily 
unavailable)
  recvmsg(12, 0x7fff60efb000, 0)          = -1 EAGAIN (Resource temporarily 
unavailable)
  poll([{fd=4, events=POLLIN}, {fd=5, events=POLLIN}, {fd=11, events=POLLIN}, 
{fd=12, events=POLLIN}, {fd=14, events=POLLIN}, {fd=16, events=POLLIN}, {fd=26, 
events=POLLIN}, {fd=29, events=POLLIN}, {fd=32, events=POLLIN}, {fd=34, 
events=POLLIN}, {fd=37, events=POLLIN}, {fd=38, events=POLLIN}, {fd=40, 
events=POLLIN}, {fd=42, events=POLLIN}, {fd=43, events=POLLIN}], 15, 0) = 0 
(Timeout)
  recvmsg(5, 0x7fff60efb040, 0)           = -1 EAGAIN (Resource temporarily 
unavailable)
  recvmsg(5, 0x7fff60efb020, 0)           = -1 EAGAIN (Resource temporarily 
unavailable)
  recvmsg(12, 0x7fff60efb000, 0)          = -1 EAGAIN (Resource temporarily 
unavailable)
  poll([{fd=4, events=POLLIN}, {fd=5, events=POLLIN}, {fd=11, events=POLLIN}, 
{fd=12, events=POLLIN}, {fd=14, events=POLLIN}, {fd=16, events=POLLIN}, {fd=26, 
events=POLLIN}, {fd=29, events=POLLIN}, {fd=32, events=POLLIN}, {fd=34, 
events=POLLIN}, {fd=37, events=POLLIN}, {fd=38, events=POLLIN}, {fd=40, 
events=POLLIN}, {fd=42, events=POLLIN}, {fd=43, events=POLLIN}], 15, 0) = 0 
(Timeout)
  recvmsg(5, 0x7fff60efb040, 0)           = -1 EAGAIN (Resource temporarily 
unavailable)
  open("/proc/self/stat", O_RDONLY)       = 36
  fstat(36, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
  fcntl(36, F_GETFL)                      = 0x8000 (flags O_RDONLY|O_LARGEFILE)
  fstat(36, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
  read(36, "3039 (gnome-shell) R 2930 2917 2"..., 4096) = 354
  read(36, "", 3072)                      = 0
  close(36)                               = 0
  recvmsg(5, 0x7fff60efb020, 0)           = -1 EAGAIN (Resource temporarily 
unavailable)
  recvmsg(12, 0x7fff60efb000, 0)          = -1 EAGAIN (Resource temporarily 
unavailable)
  poll([{fd=4, events=POLLIN}, {fd=5, events=POLLIN}, {fd=11, events=POLLIN}, 
{fd=12, events=POLLIN}, {fd=14, events=POLLIN}, {fd=16, events=POLLIN}, {fd=26, 
events=POLLIN}, {fd=29, events=POLLIN}, {fd=32, events=POLLIN}, {fd=34, 
events=POLLIN}, {fd=37, events=POLLIN}, {fd=38, events=POLLIN}, {fd=40, 
events=POLLIN}, {fd=42, events=POLLIN}, {fd=43, events=POLLIN}], 15, 117885) = 
1 ([{fd=4, revents=POLLIN}])
  read(4, "\1\0\0\0\0\0\0\0", 16)         = 8
  recvmsg(5, 0x7fff60efb040, 0)           = -1 EAGAIN (Resource temporarily 
unavailable)
  recvmsg(5, 0x7fff60efb020, 0)           = -1 EAGAIN (Resource temporarily 
unavailable)
  recvmsg(12, {msg_name(0)=NULL, 
msg_iov(1)=[{"[\2\327&h\0@\0i\0@\0(nu\22\n\0I\0\336\2\232\1\265\0038\2\362\2\355\1",
 4096}], msg_controllen=0, msg_flags=0}, 0) = 32
  recvmsg(12, 0x7fff60efb000, 0)          = -1 EAGAIN (Resource temporarily 
unavailable)
  poll([{fd=4, events=POLLIN}, {fd=5, events=POLLIN}, {fd=11, events=POLLIN}, 
{fd=12, events=POLLIN}, {fd=14, events=POLLIN}, {fd=16, events=POLLIN}, {fd=26, 
events=POLLIN}, {fd=29, events=POLLIN}, {fd=32, events=POLLIN}, {fd=34, 
events=POLLIN}, {fd=37, events=POLLIN}, {fd=38, events=POLLIN}, {fd=40, 
events=POLLIN}, {fd=42, events=POLLIN}, {fd=43, events=POLLIN}], 15, 0) = 0 
(Timeout)
  recvmsg(5, 0x7fff60efb040, 0)           = -1 EAGAIN (Resource temporarily 
unavailable)
  write(4, "\1\0\0\0\0\0\0\0", 8)         = 8
  recvmsg(12, 0x7fff60efaed0, 0)          = -1 EAGAIN (Resource temporarily 
unavailable)
  recvmsg(5, 0x7fff60efb020, 0)           = -1 EAGAIN (Resource temporarily 
unavailable)
  recvmsg(12, 0x7fff60efb000, 0)          = -1 EAGAIN (Resource temporarily 
unavailable)
  poll([{fd=4, events=POLLIN}, {fd=5, events=POLLIN}, {fd=11, events=POLLIN}, 
{fd=12, events=POLLIN}, {fd=14, events=POLLIN}, {fd=16, events=POLLIN}, {fd=26, 
events=POLLIN}, {fd=29, events=POLLIN}, {fd=32, events=POLLIN}, {fd=34, 
events=POLLIN}, {fd=37, events=POLLIN}, {fd=38, events=POLLIN}, {fd=40, 
events=POLLIN}, {fd=42, events=POLLIN}, {fd=43, events=POLLIN}], 15, 0) = 1 
([{fd=4, revents=POLLIN}])
  read(4, "\1\0\0\0\0\0\0\0", 16)         = 8
  recvmsg(5, 0x7fff60efb040, 0)           = -1 EAGAIN (Resource temporarily 
unavailable)
  open("/proc/self/stat", O_RDONLY)       = 36
  fstat(36, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
  fcntl(36, F_GETFL)                      = 0x8000 (flags O_RDONLY|O_LARGEFILE)
  fstat(36, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
  read(36, "3039 (gnome-shell) R 2930 2917 2"..., 4096) = 354
  read(36, "", 3072)                      = 0
  close(36)                               = 0
  recvmsg(5, 0x7fff60efb020, 0)           = -1 EAGAIN (Resource temporarily 
unavailable)
  recvmsg(12, 0x7fff60efb000, 0)          = -1 EAGAIN (Resource temporarily 
unavailable)
  poll([{fd=4, events=POLLIN}, {fd=5, events=POLLIN}, {fd=11, events=POLLIN}, 
{fd=12, events=POLLIN}, {fd=14, events=POLLIN}, {fd=16, events=POLLIN}, {fd=26, 
events=POLLIN}, {fd=29, events=POLLIN}, {fd=32, events=POLLIN}, {fd=34, 
events=POLLIN}, {fd=37, events=POLLIN}, {fd=38, events=POLLIN}, {fd=40, 
events=POLLIN}, {fd=42, events=POLLIN}, {fd=43, events=POLLIN}], 15, 1) = 0 
(Timeout)
  recvmsg(5, 0x7fff60efb040, 0)           = -1 EAGAIN (Resource temporarily 
unavailable)
  poll([{fd=12, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=12, revents=POLLOUT}])
  writev(12, [{"\217\3\4\0i\0@\0\0\0\0\0\0\0\0\0+\0\1\0", 20}, {NULL, 0}, {"", 
0}], 3) = 20
  poll([{fd=12, events=POLLIN}], 1, -1)   = 1 ([{fd=12, revents=POLLIN}])
  recvmsg(12, {msg_name(0)=NULL, 
msg_iov(1)=[{"\1\2\331&\0\0\0\0\250\0`\2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0",
 4096}], msg_controllen=0, msg_flags=0}, 0) = 32
  recvmsg(12, 0x7fff60efaf60, 0)          = -1 EAGAIN (Resource temporarily 
unavailable)
  recvmsg(12, 0x7fff60efaf60, 0)          = -1 EAGAIN (Resource temporarily 
unavailable)
  ioctl(6, DRM_IOCTL_I915_GEM_MADVISE, 0x7fff60efa960) = 0
  ioctl(6, DRM_IOCTL_I915_GEM_BUSY, 0x7fff60efa910) = 0
  ioctl(6, DRM_IOCTL_I915_GEM_MADVISE, 0x7fff60efa900) = 0
  ioctl(6, DRM_IOCTL_I915_GEM_PWRITE, 0x7fff60efa9b0) = 0
  ioctl(6, DRM_IOCTL_I915_GEM_BUSY, 0x7fff60efac50) = 0
  ioctl(6, DRM_IOCTL_I915_GEM_SET_DOMAIN, 0x7fff60efaba0) = 0
  ioctl(6, DRM_IOCTL_I915_GEM_SW_FINISH, 0x7fff60efad30) = 0
  ioctl(6, DRM_IOCTL_I915_GEM_SW_FINISH, 0x7fff60efae30) = 0
  ioctl(6, _IOC(_IOC_READ|_IOC_WRITE, 0x64, 0x69, 0x40), 0x7fff60efadb0) = 0
  ioctl(6, DRM_IOCTL_I915_GEM_SET_DOMAIN, 0x7fff60efae30) = 0
  ioctl(6, DRM_IOCTL_I915_GEM_MADVISE, 0x7fff60efadb0) = 0
  ioctl(6, DRM_IOCTL_I915_GEM_BUSY, 0x7fff60efad80) = 0
  ioctl(6, DRM_IOCTL_I915_GEM_MADVISE, 0x7fff60efad70) = 0
  ioctl(6, DRM_IOCTL_I915_GEM_SET_DOMAIN, 0x7fff60efad90) = 0
  ioctl(6, DRM_IOCTL_I915_GEM_SET_DOMAIN, 0x7fff60efae90) = 0

  ProblemType: Bug
  DistroRelease: Ubuntu 17.04
  Package: gnome-shell 3.23.91-0ubuntu4
  ProcVersionSignature: Ubuntu 4.10.0-11.13-generic 4.10.1
  Uname: Linux 4.10.0-11-generic x86_64
  ApportVersion: 2.20.4-0ubuntu2
  Architecture: amd64
  Date: Mon Mar 13 19:17:51 2017
  DisplayManager: gdm3
  InstallationDate: Installed on 2016-12-02 (100 days ago)
  InstallationMedia: Ubuntu-GNOME 16.10 "Yakkety Yak" - Release amd64 
(20161012.1)
  ProcEnviron:
   LANGUAGE=en_AU:en
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_AU.UTF-8
   SHELL=/bin/bash
  SourcePackage: gnome-shell
  UpgradeStatus: No upgrade log present (probably fresh install)

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