Public bug reported:
Mutter "get-state" test cases seem to sometimes get stuck in
pthread_mutex_lock via umockdev:
(gdb) bt
#0 futex_wait
(futex_word=0x7e819ce87580 <trap_path_lock>, expected=2, private=0)
at ../sysdeps/nptl/futex-internal.h:126
#1 __GI___lll_lock_wait
(futex=futex@entry=0x7e819ce87580 <trap_path_lock>, private=0)
at ./nptl/lowlevellock.c:49
#2 0x00007e819c4a7a34 in lll_mutex_lock_optimized
(mutex=0x7e819ce87580 <trap_path_lock>) at ./nptl/pthread_mutex_lock.c:48
#3 ___pthread_mutex_lock (mutex=0x7e819ce87580 <trap_path_lock>)
at ./nptl/pthread_mutex_lock.c:87
#4 0x00007e819ce7be68 in open64 ()
at /usr/lib/x86_64-linux-gnu/libumockdev-preload.so.0
#5 0x00007e819c9683d6 in ??? () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#6 0x00007e819c96adbc in ??? () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#7 0x00007e819c92d298 in g_spawn_async_with_pipes_and_fds ()
at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#8 0x00007e819c92d3bc in g_spawn_async_with_pipes ()
at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#9 0x00007e819c92d3dd in g_spawn_async ()
at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#10 0x00005e056cdecca5 in maybe_spawn_child_command
(monitor_manager=0x5e057bccdb80, user_data=0x5e057bb08350)
at ../src/core/mutter.c:141
#11 0x00005e056cdeceeb in main (argc=1, argv=0x7fff7655afa8)
at ../src/core/mutter.c:198
(gdb) info threads
Id Target Id Frame
* 1 Thread 0x7e819a951140 (LWP 343104) "mutter" futex_wait (
futex_word=0x7e819ce87580 <trap_path_lock>, expected=2, private=0)
at ../sysdeps/nptl/futex-internal.h:126
(gdb)
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: libc6 2.43-2ubuntu1
ProcVersionSignature: Ubuntu 7.0.0-7.7-generic 7.0.0-rc3
Uname: Linux 7.0.0-7-generic x86_64
ApportVersion: 2.33.1-0ubuntu3
Architecture: amd64
CasperMD5CheckResult: pass
Date: Wed Mar 18 15:52:39 2026
InstallationDate: Installed on 2025-12-17 (91 days ago)
InstallationMedia: Ubuntu 26.04 LTS "Resolute Raccoon" - Daily amd64 (20251209)
SourcePackage: glibc
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: glibc (Ubuntu)
Importance: Undecided
Status: New
** Affects: umockdev (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute
** Also affects: umockdev (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2144723
Title:
Single threaded process hung in pthread_mutex_lock
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