[Desktop-packages] [Bug 2043517] Re: gnome-shell on non-active VT busy-loops through libwayland-server.so (sometimes)
** Changed in: xorg-server
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/2043517
Title:
gnome-shell on non-active VT busy-loops through libwayland-server.so
(sometimes)
Status in X.Org X server:
Fix Released
Status in mutter package in Ubuntu:
New
Status in xwayland package in Ubuntu:
New
Bug description:
I run several gnome sessions at once - different users on different
Virtual Terminals.
Sometimes, gnome-shell for a non-active VT starts using 100% CPU. Or,
actually 99% CPU because it's doing IPC as well. And the
corresponding XWayland uses 40% CPU.
FWIW, sending SIGSTOP to either gnome-shell or XWayland stops the
other one from busy-looping as well.
If I switch back to the affected VT, it appears to function fine, but
it is still using 100% + 40% CPU.
Version numbers:
Ubuntu 22.04.3 LTS
gnome-shell 42.9-0ubuntu2
xwayland 2:22.1.1-1ubuntu0.7
$ ps -aux | grep 'alan .*gnome-shell$'
alan9248 26.1 3.4 5492888 269136 ? Rsl 19:54 30:26
/usr/bin/gnome-shell
$ sudo strace -p 9248 2>&1|head
strace: Process 9248 attached
epoll_wait(37, [{events=EPOLLIN, data={u32=403234816, u64=139797293752320}}],
32, 0) = 1
recvmsg(21, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="\1\0\0\0\0\0\f\0\3\0\0\0", iov_len=752}, {iov_base="",
iov_len=3344}], msg_iovlen=2, msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC},
MSG_DONTWAIT|MSG_CMSG_CLOEXEC) = 12
write(4, "\1\0\0\0\0\0\0\0", 8) = 8
sendmsg(21, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="\3\0\0\0\0\0\f\0[\2\0\0\1\0\0\0\1\0\f\0\3\0\0\0",
iov_len=24}], msg_iovlen=1, msg_controllen=0, msg_flags=0},
MSG_DONTWAIT|MSG_NOSIGNAL) = 24
poll([{fd=4, events=POLLIN}, {fd=8, events=POLLIN}, {fd=9, events=POLLIN},
{fd=19, events=POLLIN}, {fd=20, events=POLLIN}, {fd=23, events=POLLIN}, {fd=24,
events=POLLIN}, {fd=25, events=POLLIN}, {fd=34, events=POLLIN}, {fd=36,
events=POLLIN}, {fd=37, events=POLLIN}, {fd=54, events=POLLIN}, {fd=63,
events=POLLIN}, {fd=66, events=POLLIN}], 14, 79809702) = 2 ([{fd=4,
revents=POLLIN}, {fd=37, revents=POLLIN}])
read(4, "\2\0\0\0\0\0\0\0", 16) = 8
write(4, "\1\0\0\0\0\0\0\0", 8) = 8
epoll_wait(37, [{events=EPOLLIN, data={u32=403234816, u64=139797293752320}}],
32, 0) = 1
The recvmsg() call is here:
#0 __libc_recvmsg (fd=21, msg=0x7fff1de64a50, flags=1073741888) at
../sysdeps/unix/sysv/linux/recvmsg.c:35
#1 0x7f2531ea5ad6 in () at /lib/x86_64-linux-gnu/libwayland-server.so.0
#2 0x7f2531ea4eea in wl_event_loop_dispatch () at
/lib/x86_64-linux-gnu/libwayland-server.so.0
#3 0x7f2531d2b45b in wayland_event_source_dispatch (base=, callback=, data=)
at ../src/wayland/meta-wayland.c:110
#4 0x7f2532b42d3b in g_main_dispatch (context=0x55c0046cc8f0) at
../../../glib/gmain.c:3419
#5 g_main_context_dispatch (context=0x55c0046cc8f0) at
../../../glib/gmain.c:4137
#6 0x7f2532b98258 in g_main_context_iterate.constprop.0
(context=0x55c0046cc8f0, block=block@entry=1, dispatch=dispatch@entry=1,
self=) at ../../../glib/gmain.c:4213
#7 0x7f2532b422b3 in g_main_loop_run (loop=0x55c00698ae30) at
../../../glib/gmain.c:4413
#8 0x7f2531cd0b79 in meta_context_run_main_loop
(context=context@entry=0x55c0046c70c0, error=error@entry=0x7fff1de64f08)
at ../src/core/meta-context.c:437
#9 0x55c003cf4f12 in main (argc=, argv=)
at ../src/main.c:650
The sendmsg() call is here:
Thread 1 "gnome-shell" hit Breakpoint 1, __libc_sendmsg (fd=21,
msg=0x7fff1de64c50, flags=16448) at ../sysdeps/unix/sysv/linux/sendmsg.c:26
26../sysdeps/unix/sysv/linux/sendmsg.c: No such file or directory.
(gdb) where
#0 __libc_sendmsg (fd=21, msg=0x7fff1de64c50, flags=16448) at
../sysdeps/unix/sysv/linux/sendmsg.c:26
#1 0x7f2531ea1c9d in () at /lib/x86_64-linux-gnu/libwayland-server.so.0
#2 0x7f2531ea565e in wl_display_flush_clients () at
/lib/x86_64-linux-gnu/libwayland-server.so.0
#3 0x7f2531d2b437 in wayland_event_source_prepare
(base=base@entry=0x55c004a374d0, timeout=timeout@entry=0x7fff1de64dc4)
at ../src/wayland/meta-wayland.c:97
#4 0x7f2532b428e7 in g_main_context_prepare (context=0x55c0046cc8f0,
priority=0x7fff1de64e50) at ../../../glib/gmain.c:3739
#5 0x7f2532b98123 in g_main_context_iterate.constprop.0
(context=0x55c0046cc8f0, block=block@entry=1, dispatch=dispatch@entry=1,
self=) at ../../../glib/gmain.c:4193
#6 0x7f2532b422b3 in g_main_loop_run (loop=0x55c00698ae30) at
../../../glib/gmain.c:4413
#7 0x7f2531cd0b79 in meta_context_run_main_loop
(context=context@entry=0x55c0046c70c0, error=error@entry=0x7fff1de64f08)
at ../src/core/meta-context.c:437
#8 0x55c003cf4f12 in main (argc=, argv=)
at ../src/main.c:650
To manage
[Desktop-packages] [Bug 2043517] Re: gnome-shell on non-active VT busy-loops through libwayland-server.so (sometimes)
** Changed in: xorg-server
Status: Unknown => New
--
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xwayland in Ubuntu.
https://bugs.launchpad.net/bugs/2043517
Title:
gnome-shell on non-active VT busy-loops through libwayland-server.so
(sometimes)
Status in X.Org X server:
New
Status in mutter package in Ubuntu:
New
Status in xwayland package in Ubuntu:
New
Bug description:
I run several gnome sessions at once - different users on different
Virtual Terminals.
Sometimes, gnome-shell for a non-active VT starts using 100% CPU. Or,
actually 99% CPU because it's doing IPC as well. And the
corresponding XWayland uses 40% CPU.
FWIW, sending SIGSTOP to either gnome-shell or XWayland stops the
other one from busy-looping as well.
If I switch back to the affected VT, it appears to function fine, but
it is still using 100% + 40% CPU.
Version numbers:
Ubuntu 22.04.3 LTS
gnome-shell 42.9-0ubuntu2
xwayland 2:22.1.1-1ubuntu0.7
$ ps -aux | grep 'alan .*gnome-shell$'
alan9248 26.1 3.4 5492888 269136 ? Rsl 19:54 30:26
/usr/bin/gnome-shell
$ sudo strace -p 9248 2>&1|head
strace: Process 9248 attached
epoll_wait(37, [{events=EPOLLIN, data={u32=403234816, u64=139797293752320}}],
32, 0) = 1
recvmsg(21, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="\1\0\0\0\0\0\f\0\3\0\0\0", iov_len=752}, {iov_base="",
iov_len=3344}], msg_iovlen=2, msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC},
MSG_DONTWAIT|MSG_CMSG_CLOEXEC) = 12
write(4, "\1\0\0\0\0\0\0\0", 8) = 8
sendmsg(21, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="\3\0\0\0\0\0\f\0[\2\0\0\1\0\0\0\1\0\f\0\3\0\0\0",
iov_len=24}], msg_iovlen=1, msg_controllen=0, msg_flags=0},
MSG_DONTWAIT|MSG_NOSIGNAL) = 24
poll([{fd=4, events=POLLIN}, {fd=8, events=POLLIN}, {fd=9, events=POLLIN},
{fd=19, events=POLLIN}, {fd=20, events=POLLIN}, {fd=23, events=POLLIN}, {fd=24,
events=POLLIN}, {fd=25, events=POLLIN}, {fd=34, events=POLLIN}, {fd=36,
events=POLLIN}, {fd=37, events=POLLIN}, {fd=54, events=POLLIN}, {fd=63,
events=POLLIN}, {fd=66, events=POLLIN}], 14, 79809702) = 2 ([{fd=4,
revents=POLLIN}, {fd=37, revents=POLLIN}])
read(4, "\2\0\0\0\0\0\0\0", 16) = 8
write(4, "\1\0\0\0\0\0\0\0", 8) = 8
epoll_wait(37, [{events=EPOLLIN, data={u32=403234816, u64=139797293752320}}],
32, 0) = 1
The recvmsg() call is here:
#0 __libc_recvmsg (fd=21, msg=0x7fff1de64a50, flags=1073741888) at
../sysdeps/unix/sysv/linux/recvmsg.c:35
#1 0x7f2531ea5ad6 in () at /lib/x86_64-linux-gnu/libwayland-server.so.0
#2 0x7f2531ea4eea in wl_event_loop_dispatch () at
/lib/x86_64-linux-gnu/libwayland-server.so.0
#3 0x7f2531d2b45b in wayland_event_source_dispatch (base=, callback=, data=)
at ../src/wayland/meta-wayland.c:110
#4 0x7f2532b42d3b in g_main_dispatch (context=0x55c0046cc8f0) at
../../../glib/gmain.c:3419
#5 g_main_context_dispatch (context=0x55c0046cc8f0) at
../../../glib/gmain.c:4137
#6 0x7f2532b98258 in g_main_context_iterate.constprop.0
(context=0x55c0046cc8f0, block=block@entry=1, dispatch=dispatch@entry=1,
self=) at ../../../glib/gmain.c:4213
#7 0x7f2532b422b3 in g_main_loop_run (loop=0x55c00698ae30) at
../../../glib/gmain.c:4413
#8 0x7f2531cd0b79 in meta_context_run_main_loop
(context=context@entry=0x55c0046c70c0, error=error@entry=0x7fff1de64f08)
at ../src/core/meta-context.c:437
#9 0x55c003cf4f12 in main (argc=, argv=)
at ../src/main.c:650
The sendmsg() call is here:
Thread 1 "gnome-shell" hit Breakpoint 1, __libc_sendmsg (fd=21,
msg=0x7fff1de64c50, flags=16448) at ../sysdeps/unix/sysv/linux/sendmsg.c:26
26../sysdeps/unix/sysv/linux/sendmsg.c: No such file or directory.
(gdb) where
#0 __libc_sendmsg (fd=21, msg=0x7fff1de64c50, flags=16448) at
../sysdeps/unix/sysv/linux/sendmsg.c:26
#1 0x7f2531ea1c9d in () at /lib/x86_64-linux-gnu/libwayland-server.so.0
#2 0x7f2531ea565e in wl_display_flush_clients () at
/lib/x86_64-linux-gnu/libwayland-server.so.0
#3 0x7f2531d2b437 in wayland_event_source_prepare
(base=base@entry=0x55c004a374d0, timeout=timeout@entry=0x7fff1de64dc4)
at ../src/wayland/meta-wayland.c:97
#4 0x7f2532b428e7 in g_main_context_prepare (context=0x55c0046cc8f0,
priority=0x7fff1de64e50) at ../../../glib/gmain.c:3739
#5 0x7f2532b98123 in g_main_context_iterate.constprop.0
(context=0x55c0046cc8f0, block=block@entry=1, dispatch=dispatch@entry=1,
self=) at ../../../glib/gmain.c:4193
#6 0x7f2532b422b3 in g_main_loop_run (loop=0x55c00698ae30) at
../../../glib/gmain.c:4413
#7 0x7f2531cd0b79 in meta_context_run_main_loop
(context=context@entry=0x55c0046c70c0, error=error@entry=0x7fff1de64f08)
at ../src/core/meta-context.c:437
#8 0x55c003cf4f12 in main (argc=, argv=)
at ../src/main.c:650
To manage notifications about this
[Desktop-packages] [Bug 2043517] Re: gnome-shell on non-active VT busy-loops through libwayland-server.so (sometimes)
** Also affects: xwayland (Ubuntu)
Importance: Undecided
Status: New
** Also affects: xorg-server via
https://gitlab.freedesktop.org/xorg/xserver/-/issues/1648
Importance: Unknown
Status: Unknown
--
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xwayland in Ubuntu.
https://bugs.launchpad.net/bugs/2043517
Title:
gnome-shell on non-active VT busy-loops through libwayland-server.so
(sometimes)
Status in X.Org X server:
Unknown
Status in mutter package in Ubuntu:
New
Status in xwayland package in Ubuntu:
New
Bug description:
I run several gnome sessions at once - different users on different
Virtual Terminals.
Sometimes, gnome-shell for a non-active VT starts using 100% CPU. Or,
actually 99% CPU because it's doing IPC as well. And the
corresponding XWayland uses 40% CPU.
FWIW, sending SIGSTOP to either gnome-shell or XWayland stops the
other one from busy-looping as well.
If I switch back to the affected VT, it appears to function fine, but
it is still using 100% + 40% CPU.
Version numbers:
Ubuntu 22.04.3 LTS
gnome-shell 42.9-0ubuntu2
xwayland 2:22.1.1-1ubuntu0.7
$ ps -aux | grep 'alan .*gnome-shell$'
alan9248 26.1 3.4 5492888 269136 ? Rsl 19:54 30:26
/usr/bin/gnome-shell
$ sudo strace -p 9248 2>&1|head
strace: Process 9248 attached
epoll_wait(37, [{events=EPOLLIN, data={u32=403234816, u64=139797293752320}}],
32, 0) = 1
recvmsg(21, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="\1\0\0\0\0\0\f\0\3\0\0\0", iov_len=752}, {iov_base="",
iov_len=3344}], msg_iovlen=2, msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC},
MSG_DONTWAIT|MSG_CMSG_CLOEXEC) = 12
write(4, "\1\0\0\0\0\0\0\0", 8) = 8
sendmsg(21, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="\3\0\0\0\0\0\f\0[\2\0\0\1\0\0\0\1\0\f\0\3\0\0\0",
iov_len=24}], msg_iovlen=1, msg_controllen=0, msg_flags=0},
MSG_DONTWAIT|MSG_NOSIGNAL) = 24
poll([{fd=4, events=POLLIN}, {fd=8, events=POLLIN}, {fd=9, events=POLLIN},
{fd=19, events=POLLIN}, {fd=20, events=POLLIN}, {fd=23, events=POLLIN}, {fd=24,
events=POLLIN}, {fd=25, events=POLLIN}, {fd=34, events=POLLIN}, {fd=36,
events=POLLIN}, {fd=37, events=POLLIN}, {fd=54, events=POLLIN}, {fd=63,
events=POLLIN}, {fd=66, events=POLLIN}], 14, 79809702) = 2 ([{fd=4,
revents=POLLIN}, {fd=37, revents=POLLIN}])
read(4, "\2\0\0\0\0\0\0\0", 16) = 8
write(4, "\1\0\0\0\0\0\0\0", 8) = 8
epoll_wait(37, [{events=EPOLLIN, data={u32=403234816, u64=139797293752320}}],
32, 0) = 1
The recvmsg() call is here:
#0 __libc_recvmsg (fd=21, msg=0x7fff1de64a50, flags=1073741888) at
../sysdeps/unix/sysv/linux/recvmsg.c:35
#1 0x7f2531ea5ad6 in () at /lib/x86_64-linux-gnu/libwayland-server.so.0
#2 0x7f2531ea4eea in wl_event_loop_dispatch () at
/lib/x86_64-linux-gnu/libwayland-server.so.0
#3 0x7f2531d2b45b in wayland_event_source_dispatch (base=, callback=, data=)
at ../src/wayland/meta-wayland.c:110
#4 0x7f2532b42d3b in g_main_dispatch (context=0x55c0046cc8f0) at
../../../glib/gmain.c:3419
#5 g_main_context_dispatch (context=0x55c0046cc8f0) at
../../../glib/gmain.c:4137
#6 0x7f2532b98258 in g_main_context_iterate.constprop.0
(context=0x55c0046cc8f0, block=block@entry=1, dispatch=dispatch@entry=1,
self=) at ../../../glib/gmain.c:4213
#7 0x7f2532b422b3 in g_main_loop_run (loop=0x55c00698ae30) at
../../../glib/gmain.c:4413
#8 0x7f2531cd0b79 in meta_context_run_main_loop
(context=context@entry=0x55c0046c70c0, error=error@entry=0x7fff1de64f08)
at ../src/core/meta-context.c:437
#9 0x55c003cf4f12 in main (argc=, argv=)
at ../src/main.c:650
The sendmsg() call is here:
Thread 1 "gnome-shell" hit Breakpoint 1, __libc_sendmsg (fd=21,
msg=0x7fff1de64c50, flags=16448) at ../sysdeps/unix/sysv/linux/sendmsg.c:26
26../sysdeps/unix/sysv/linux/sendmsg.c: No such file or directory.
(gdb) where
#0 __libc_sendmsg (fd=21, msg=0x7fff1de64c50, flags=16448) at
../sysdeps/unix/sysv/linux/sendmsg.c:26
#1 0x7f2531ea1c9d in () at /lib/x86_64-linux-gnu/libwayland-server.so.0
#2 0x7f2531ea565e in wl_display_flush_clients () at
/lib/x86_64-linux-gnu/libwayland-server.so.0
#3 0x7f2531d2b437 in wayland_event_source_prepare
(base=base@entry=0x55c004a374d0, timeout=timeout@entry=0x7fff1de64dc4)
at ../src/wayland/meta-wayland.c:97
#4 0x7f2532b428e7 in g_main_context_prepare (context=0x55c0046cc8f0,
priority=0x7fff1de64e50) at ../../../glib/gmain.c:3739
#5 0x7f2532b98123 in g_main_context_iterate.constprop.0
(context=0x55c0046cc8f0, block=block@entry=1, dispatch=dispatch@entry=1,
self=) at ../../../glib/gmain.c:4193
#6 0x7f2532b422b3 in g_main_loop_run (loop=0x55c00698ae30) at
../../../glib/gmain.c:4413
#7 0x7f2531cd0b79 in meta_context_run_main_loop
(context=context@entry=0x55c0046c70c0,
[Desktop-packages] [Bug 2043517] Re: gnome-shell on non-active VT busy-loops through libwayland-server.so (sometimes)
The bug re-occurred, after manually building libwayland with debugging
symbols.
So I could do more debugging, and I think this Ubuntu bug needs to be
reassigned to Xwayland.
I have filed more details in the upstream Xwayland tracker.
https://gitlab.freedesktop.org/xorg/xserver/-/issues/1648
** Bug watch added: gitlab.freedesktop.org/xorg/xserver/-/issues #1648
https://gitlab.freedesktop.org/xorg/xserver/-/issues/1648
--
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to mutter in Ubuntu.
https://bugs.launchpad.net/bugs/2043517
Title:
gnome-shell on non-active VT busy-loops through libwayland-server.so
(sometimes)
Status in mutter package in Ubuntu:
New
Bug description:
I run several gnome sessions at once - different users on different
Virtual Terminals.
Sometimes, gnome-shell for a non-active VT starts using 100% CPU. Or,
actually 99% CPU because it's doing IPC as well. And the
corresponding XWayland uses 40% CPU.
FWIW, sending SIGSTOP to either gnome-shell or XWayland stops the
other one from busy-looping as well.
If I switch back to the affected VT, it appears to function fine, but
it is still using 100% + 40% CPU.
Version numbers:
Ubuntu 22.04.3 LTS
gnome-shell 42.9-0ubuntu2
xwayland 2:22.1.1-1ubuntu0.7
$ ps -aux | grep 'alan .*gnome-shell$'
alan9248 26.1 3.4 5492888 269136 ? Rsl 19:54 30:26
/usr/bin/gnome-shell
$ sudo strace -p 9248 2>&1|head
strace: Process 9248 attached
epoll_wait(37, [{events=EPOLLIN, data={u32=403234816, u64=139797293752320}}],
32, 0) = 1
recvmsg(21, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="\1\0\0\0\0\0\f\0\3\0\0\0", iov_len=752}, {iov_base="",
iov_len=3344}], msg_iovlen=2, msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC},
MSG_DONTWAIT|MSG_CMSG_CLOEXEC) = 12
write(4, "\1\0\0\0\0\0\0\0", 8) = 8
sendmsg(21, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="\3\0\0\0\0\0\f\0[\2\0\0\1\0\0\0\1\0\f\0\3\0\0\0",
iov_len=24}], msg_iovlen=1, msg_controllen=0, msg_flags=0},
MSG_DONTWAIT|MSG_NOSIGNAL) = 24
poll([{fd=4, events=POLLIN}, {fd=8, events=POLLIN}, {fd=9, events=POLLIN},
{fd=19, events=POLLIN}, {fd=20, events=POLLIN}, {fd=23, events=POLLIN}, {fd=24,
events=POLLIN}, {fd=25, events=POLLIN}, {fd=34, events=POLLIN}, {fd=36,
events=POLLIN}, {fd=37, events=POLLIN}, {fd=54, events=POLLIN}, {fd=63,
events=POLLIN}, {fd=66, events=POLLIN}], 14, 79809702) = 2 ([{fd=4,
revents=POLLIN}, {fd=37, revents=POLLIN}])
read(4, "\2\0\0\0\0\0\0\0", 16) = 8
write(4, "\1\0\0\0\0\0\0\0", 8) = 8
epoll_wait(37, [{events=EPOLLIN, data={u32=403234816, u64=139797293752320}}],
32, 0) = 1
The recvmsg() call is here:
#0 __libc_recvmsg (fd=21, msg=0x7fff1de64a50, flags=1073741888) at
../sysdeps/unix/sysv/linux/recvmsg.c:35
#1 0x7f2531ea5ad6 in () at /lib/x86_64-linux-gnu/libwayland-server.so.0
#2 0x7f2531ea4eea in wl_event_loop_dispatch () at
/lib/x86_64-linux-gnu/libwayland-server.so.0
#3 0x7f2531d2b45b in wayland_event_source_dispatch (base=, callback=, data=)
at ../src/wayland/meta-wayland.c:110
#4 0x7f2532b42d3b in g_main_dispatch (context=0x55c0046cc8f0) at
../../../glib/gmain.c:3419
#5 g_main_context_dispatch (context=0x55c0046cc8f0) at
../../../glib/gmain.c:4137
#6 0x7f2532b98258 in g_main_context_iterate.constprop.0
(context=0x55c0046cc8f0, block=block@entry=1, dispatch=dispatch@entry=1,
self=) at ../../../glib/gmain.c:4213
#7 0x7f2532b422b3 in g_main_loop_run (loop=0x55c00698ae30) at
../../../glib/gmain.c:4413
#8 0x7f2531cd0b79 in meta_context_run_main_loop
(context=context@entry=0x55c0046c70c0, error=error@entry=0x7fff1de64f08)
at ../src/core/meta-context.c:437
#9 0x55c003cf4f12 in main (argc=, argv=)
at ../src/main.c:650
The sendmsg() call is here:
Thread 1 "gnome-shell" hit Breakpoint 1, __libc_sendmsg (fd=21,
msg=0x7fff1de64c50, flags=16448) at ../sysdeps/unix/sysv/linux/sendmsg.c:26
26../sysdeps/unix/sysv/linux/sendmsg.c: No such file or directory.
(gdb) where
#0 __libc_sendmsg (fd=21, msg=0x7fff1de64c50, flags=16448) at
../sysdeps/unix/sysv/linux/sendmsg.c:26
#1 0x7f2531ea1c9d in () at /lib/x86_64-linux-gnu/libwayland-server.so.0
#2 0x7f2531ea565e in wl_display_flush_clients () at
/lib/x86_64-linux-gnu/libwayland-server.so.0
#3 0x7f2531d2b437 in wayland_event_source_prepare
(base=base@entry=0x55c004a374d0, timeout=timeout@entry=0x7fff1de64dc4)
at ../src/wayland/meta-wayland.c:97
#4 0x7f2532b428e7 in g_main_context_prepare (context=0x55c0046cc8f0,
priority=0x7fff1de64e50) at ../../../glib/gmain.c:3739
#5 0x7f2532b98123 in g_main_context_iterate.constprop.0
(context=0x55c0046cc8f0, block=block@entry=1, dispatch=dispatch@entry=1,
self=) at ../../../glib/gmain.c:4193
#6 0x7f2532b422b3 in g_main_loop_run (loop=0x55c00698ae30) at
[Desktop-packages] [Bug 2043517] Re: gnome-shell on non-active VT busy-loops through libwayland-server.so (sometimes)
Thanks for the bug report. Please also report the issue upstream at
https://gitlab.gnome.org/GNOME/mutter/-/issues
** Tags added: jammy
** Package changed: gnome-shell (Ubuntu) => mutter (Ubuntu)
--
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to mutter in Ubuntu.
https://bugs.launchpad.net/bugs/2043517
Title:
gnome-shell on non-active VT busy-loops through libwayland-server.so
(sometimes)
Status in mutter package in Ubuntu:
New
Bug description:
I run several gnome sessions at once - different users on different
Virtual Terminals.
Sometimes, gnome-shell for a non-active VT starts using 100% CPU. Or,
actually 99% CPU because it's doing IPC as well. And the
corresponding XWayland uses 40% CPU.
FWIW, sending SIGSTOP to either gnome-shell or XWayland stops the
other one from busy-looping as well.
If I switch back to the affected VT, it appears to function fine, but
it is still using 100% + 40% CPU.
Version numbers:
Ubuntu 22.04.3 LTS
gnome-shell 42.9-0ubuntu2
xwayland 2:22.1.1-1ubuntu0.7
$ ps -aux | grep 'alan .*gnome-shell$'
alan9248 26.1 3.4 5492888 269136 ? Rsl 19:54 30:26
/usr/bin/gnome-shell
$ sudo strace -p 9248 2>&1|head
strace: Process 9248 attached
epoll_wait(37, [{events=EPOLLIN, data={u32=403234816, u64=139797293752320}}],
32, 0) = 1
recvmsg(21, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="\1\0\0\0\0\0\f\0\3\0\0\0", iov_len=752}, {iov_base="",
iov_len=3344}], msg_iovlen=2, msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC},
MSG_DONTWAIT|MSG_CMSG_CLOEXEC) = 12
write(4, "\1\0\0\0\0\0\0\0", 8) = 8
sendmsg(21, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="\3\0\0\0\0\0\f\0[\2\0\0\1\0\0\0\1\0\f\0\3\0\0\0",
iov_len=24}], msg_iovlen=1, msg_controllen=0, msg_flags=0},
MSG_DONTWAIT|MSG_NOSIGNAL) = 24
poll([{fd=4, events=POLLIN}, {fd=8, events=POLLIN}, {fd=9, events=POLLIN},
{fd=19, events=POLLIN}, {fd=20, events=POLLIN}, {fd=23, events=POLLIN}, {fd=24,
events=POLLIN}, {fd=25, events=POLLIN}, {fd=34, events=POLLIN}, {fd=36,
events=POLLIN}, {fd=37, events=POLLIN}, {fd=54, events=POLLIN}, {fd=63,
events=POLLIN}, {fd=66, events=POLLIN}], 14, 79809702) = 2 ([{fd=4,
revents=POLLIN}, {fd=37, revents=POLLIN}])
read(4, "\2\0\0\0\0\0\0\0", 16) = 8
write(4, "\1\0\0\0\0\0\0\0", 8) = 8
epoll_wait(37, [{events=EPOLLIN, data={u32=403234816, u64=139797293752320}}],
32, 0) = 1
The recvmsg() call is here:
#0 __libc_recvmsg (fd=21, msg=0x7fff1de64a50, flags=1073741888) at
../sysdeps/unix/sysv/linux/recvmsg.c:35
#1 0x7f2531ea5ad6 in () at /lib/x86_64-linux-gnu/libwayland-server.so.0
#2 0x7f2531ea4eea in wl_event_loop_dispatch () at
/lib/x86_64-linux-gnu/libwayland-server.so.0
#3 0x7f2531d2b45b in wayland_event_source_dispatch (base=, callback=, data=)
at ../src/wayland/meta-wayland.c:110
#4 0x7f2532b42d3b in g_main_dispatch (context=0x55c0046cc8f0) at
../../../glib/gmain.c:3419
#5 g_main_context_dispatch (context=0x55c0046cc8f0) at
../../../glib/gmain.c:4137
#6 0x7f2532b98258 in g_main_context_iterate.constprop.0
(context=0x55c0046cc8f0, block=block@entry=1, dispatch=dispatch@entry=1,
self=) at ../../../glib/gmain.c:4213
#7 0x7f2532b422b3 in g_main_loop_run (loop=0x55c00698ae30) at
../../../glib/gmain.c:4413
#8 0x7f2531cd0b79 in meta_context_run_main_loop
(context=context@entry=0x55c0046c70c0, error=error@entry=0x7fff1de64f08)
at ../src/core/meta-context.c:437
#9 0x55c003cf4f12 in main (argc=, argv=)
at ../src/main.c:650
The sendmsg() call is here:
Thread 1 "gnome-shell" hit Breakpoint 1, __libc_sendmsg (fd=21,
msg=0x7fff1de64c50, flags=16448) at ../sysdeps/unix/sysv/linux/sendmsg.c:26
26../sysdeps/unix/sysv/linux/sendmsg.c: No such file or directory.
(gdb) where
#0 __libc_sendmsg (fd=21, msg=0x7fff1de64c50, flags=16448) at
../sysdeps/unix/sysv/linux/sendmsg.c:26
#1 0x7f2531ea1c9d in () at /lib/x86_64-linux-gnu/libwayland-server.so.0
#2 0x7f2531ea565e in wl_display_flush_clients () at
/lib/x86_64-linux-gnu/libwayland-server.so.0
#3 0x7f2531d2b437 in wayland_event_source_prepare
(base=base@entry=0x55c004a374d0, timeout=timeout@entry=0x7fff1de64dc4)
at ../src/wayland/meta-wayland.c:97
#4 0x7f2532b428e7 in g_main_context_prepare (context=0x55c0046cc8f0,
priority=0x7fff1de64e50) at ../../../glib/gmain.c:3739
#5 0x7f2532b98123 in g_main_context_iterate.constprop.0
(context=0x55c0046cc8f0, block=block@entry=1, dispatch=dispatch@entry=1,
self=) at ../../../glib/gmain.c:4193
#6 0x7f2532b422b3 in g_main_loop_run (loop=0x55c00698ae30) at
../../../glib/gmain.c:4413
#7 0x7f2531cd0b79 in meta_context_run_main_loop
(context=context@entry=0x55c0046c70c0, error=error@entry=0x7fff1de64f08)
at ../src/core/meta-context.c:437
#8 0x55c003cf4f12 in main (argc=,
[Desktop-packages] [Bug 2043517] Re: gnome-shell on non-active VT busy-loops through libwayland-server.so (sometimes)
I tried installing dbgsym packages or using debuginfod to get a full
backtrace for libwayland-server.so, but I failed.
$ sudo apt install -qq libwayland-server0-dbgsym
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies.
libwayland-server0-dbgsym : Depends: libwayland-server0 (= 1.20.0-1) but
1.20.0-1ubuntu0.1 is to be installed
E: Unable to correct problems, you have held broken packages.
$ export DEBUGINFOD_URLS="https://debuginfod.ubuntu.com;
$ sudo gdb
...
(gdb) set debuginfod enabled on
(gdb) attach 9248
(gdb) break recvmsg
Breakpoint 1 at 0x7f25319279d0: file ../sysdeps/unix/sysv/linux/recvmsg.c, line
35.
(gdb) cont
Continuing.
Thread 1 "gnome-shell" hit Breakpoint 1, __libc_recvmsg (fd=21,
msg=0x7fff1de64a50, flags=1073741888) at ../sysdeps/unix/sysv/linux/recvmsg.c:35
35 ../sysdeps/unix/sysv/linux/recvmsg.c: No such file or directory.
(gdb) bt full
#0 __libc_recvmsg (fd=21, msg=0x7fff1de64a50, flags=1073741888) at
../sysdeps/unix/sysv/linux/recvmsg.c:35
#1 0x7f2531ea5ad6 in () at /lib/x86_64-linux-gnu/libwayland-server.so.0
#2 0x7f2531ea4eea in wl_event_loop_dispatch () at
/lib/x86_64-linux-gnu/libwayland-server.so.0
#3 0x7f2531d2b45b in wayland_event_source_dispatch (base=,
callback=, data=)
at ../src/wayland/meta-wayland.c:110
source =
loop =
...
(gdb) finish
Run till exit from #0 __libc_recvmsg (fd=21, msg=0x7fff1de64a50,
flags=1073741888) at ../sysdeps/unix/sysv/linux/recvmsg.c:35
0x7f2531ea5ad6 in ?? () from /lib/x86_64-linux-gnu/libwayland-server.so.0
Value returned is $2 = 12
(gdb) finish
Run till exit from #0 0x7f2531ea5ad6 in ?? () from
/lib/x86_64-linux-gnu/libwayland-server.so.0
0x7f2531ea4eea in wl_event_loop_dispatch () from
/lib/x86_64-linux-gnu/libwayland-server.so.0
(gdb) s
Single stepping until exit from function wl_event_loop_dispatch,
which has no line number information.
wayland_event_source_dispatch (base=, callback=,
data=) at ../src/wayland/meta-wayland.c:112
112 ../src/wayland/meta-wayland.c: No such file or directory.
--
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-shell in Ubuntu.
https://bugs.launchpad.net/bugs/2043517
Title:
gnome-shell on non-active VT busy-loops through libwayland-server.so
(sometimes)
Status in gnome-shell package in Ubuntu:
New
Bug description:
I run several gnome sessions at once - different users on different
Virtual Terminals.
Sometimes, gnome-shell for a non-active VT starts using 100% CPU. Or,
actually 99% CPU because it's doing IPC as well. And the
corresponding XWayland uses 40% CPU.
FWIW, sending SIGSTOP to either gnome-shell or XWayland stops the
other one from busy-looping as well.
If I switch back to the affected VT, it appears to function fine, but
it is still using 100% + 40% CPU.
Version numbers:
Ubuntu 22.04.3 LTS
gnome-shell 42.9-0ubuntu2
xwayland 2:22.1.1-1ubuntu0.7
$ ps -aux | grep 'alan .*gnome-shell$'
alan9248 26.1 3.4 5492888 269136 ? Rsl 19:54 30:26
/usr/bin/gnome-shell
$ sudo strace -p 9248 2>&1|head
strace: Process 9248 attached
epoll_wait(37, [{events=EPOLLIN, data={u32=403234816, u64=139797293752320}}],
32, 0) = 1
recvmsg(21, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="\1\0\0\0\0\0\f\0\3\0\0\0", iov_len=752}, {iov_base="",
iov_len=3344}], msg_iovlen=2, msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC},
MSG_DONTWAIT|MSG_CMSG_CLOEXEC) = 12
write(4, "\1\0\0\0\0\0\0\0", 8) = 8
sendmsg(21, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="\3\0\0\0\0\0\f\0[\2\0\0\1\0\0\0\1\0\f\0\3\0\0\0",
iov_len=24}], msg_iovlen=1, msg_controllen=0, msg_flags=0},
MSG_DONTWAIT|MSG_NOSIGNAL) = 24
poll([{fd=4, events=POLLIN}, {fd=8, events=POLLIN}, {fd=9, events=POLLIN},
{fd=19, events=POLLIN}, {fd=20, events=POLLIN}, {fd=23, events=POLLIN}, {fd=24,
events=POLLIN}, {fd=25, events=POLLIN}, {fd=34, events=POLLIN}, {fd=36,
events=POLLIN}, {fd=37, events=POLLIN}, {fd=54, events=POLLIN}, {fd=63,
events=POLLIN}, {fd=66, events=POLLIN}], 14, 79809702) = 2 ([{fd=4,
revents=POLLIN}, {fd=37, revents=POLLIN}])
read(4, "\2\0\0\0\0\0\0\0", 16) = 8
write(4, "\1\0\0\0\0\0\0\0", 8) = 8
epoll_wait(37, [{events=EPOLLIN, data={u32=403234816, u64=139797293752320}}],
32, 0) = 1
The recvmsg() call is here:
#0 __libc_recvmsg (fd=21, msg=0x7fff1de64a50, flags=1073741888) at
../sysdeps/unix/sysv/linux/recvmsg.c:35
#1 0x7f2531ea5ad6 in () at /lib/x86_64-linux-gnu/libwayland-server.so.0
#2 0x7f2531ea4eea in wl_event_loop_dispatch () at
/lib/x86_64-linux-gnu/libwayland-server.so.0
#3
