start-hyprland crashing on session exit

[tekstryder]

Just noticed these recent coredumps.

Haven't bisected yet.

Hyprland version

Still on cbfdbe9 due to #12647 (reply in thread), but I'll disable Waybar and build today's commit to see if it still repros.

Regression

Yes

Describe the bug

#0  __pthread_kill_implementation (threadid=<optimized out>, signo=signo@entry=6, no_tid=no_tid@entry=0) at pthread_kill.c:44        
44	      return INTERNAL_SYSCALL_ERROR_P (ret) ? INTERNAL_SYSCALL_ERRNO (ret) : 0;
[Current thread is 1 (Thread 0x7f224c2a8900 (LWP 112256))]
(gdb) bt full
#0  __pthread_kill_implementation (threadid=<optimized out>, signo=signo@entry=6, no_tid=no_tid@entry=0) at pthread_kill.c:44
        tid = <optimized out>
        ret = 0
        pd = <optimized out>
        old_mask = {__val = {1}}
        ret = <optimized out>
#1  0x00007f224bc989d3 in __pthread_kill_internal (threadid=<optimized out>, signo=6) at pthread_kill.c:89
No locals.
#2  0x00007f224bc3e3a0 in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
        ret = <optimized out>
#3  0x00007f224bc2557a in __GI_abort () at abort.c:77
        act = {__sigaction_handler = {sa_handler = 0x7ffcb71f7f30, sa_sigaction = 0x7ffcb71f7f30}, sa_mask = {__val = {
              139785277074801, 45, 45, 26, 139785278624992, 0, 94658661370448, 140723380780944, 139785277020059, 140723380780448, 
              3, 140723380781248, 45, 1, 45, 94658661370448}}, sa_flags = -1222668720, sa_restorer = 0x56175516a118}
#4  0x00007f224c097bf6 in __gnu_cxx::__verbose_terminate_handler ()
    at /usr/src/debug/gcc/gcc/libstdc++-v3/libsupc++/vterminate.cc:95
        terminating = true
        t = <optimized out>
#5  0x00007f224c0b1eba in __cxxabiv1::__terminate (handler=<optimized out>)
    at /usr/src/debug/gcc/gcc/libstdc++-v3/libsupc++/eh_terminate.cc:48
No locals.
#6  0x00007f224c0975d9 in std::terminate () at /usr/src/debug/gcc/gcc/libstdc++-v3/libsupc++/eh_terminate.cc:58
No locals.
#7  0x0000561755169397 in Hyprutils::Memory::CUniquePointer<CHyprlandInstance>::CUniquePointer(CHyprlandInstance*)::{lambda(void*)#1}::_FUN(void*) ()
No symbol table info available.
#8  0x0000561755167b02 in ?? ()
No symbol table info available.
#9  <signal handler called>
No locals.
#10 __syscall_cancel_arch () at ../sysdeps/unix/sysv/linux/x86_64/syscall_cancel.S:56
No locals.
#11 0x00007f224bc9316c in __internal_syscall_cancel (a1=<optimized out>, a2=<optimized out>, a3=<optimized out>, a4=a4@entry=0, 
    a5=a5@entry=0, a6=a6@entry=0, nr=7) at cancellation.c:49
        result = <optimized out>
        pd = <optimized out>
        ch = <optimized out>
#12 0x00007f224bc931b4 in __syscall_cancel (a1=<optimized out>, a2=<optimized out>, a3=<optimized out>, a4=a4@entry=0, 
    a5=a5@entry=0, a6=a6@entry=0, nr=7) at cancellation.c:75
        r = <optimized out>
#13 0x00007f224bd0d4ae in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>)
    at ../sysdeps/unix/sysv/linux/poll.c:29
No locals.
#14 0x0000561755154844 in CHyprlandInstance::run(bool) ()
No symbol table info available.
#15 0x0000561755151ea3 in main ()
No symbol table info available.

Reproduction steps

TBD, presumably on session exit.

System info and config

hyprsysinfo.txt

[tekstryder]

Can't immediately repro with today's latest commit.

Hyprland 0.52.0 built from branch main at commit 712bcfbce58a6d352833325bb901fbcf7b58c136 dirty (protocols/xdg-shell: fix crash on null parent in pin ( 12694)).
Date: Sun Dec 21 08:21:51 2025
Tag: v0.52.0-179-g712bcfbce, commits: 6738

Libraries:
Hyprgraphics: built against 0.4.0, system has 0.4.0
Hyprutils: built against 0.11.0, system has 0.11.0
Hyprcursor: built against 0.1.13, system has 0.1.13
Hyprlang: built against 0.6.7, system has 0.6.7
Aquamarine: built against 0.10.0, system has 0.10.0

Version ABI string: 712bcfbce58a6d352833325bb901fbcf7b58c136_aq_0.10_hu_0.11_hg_0.4_hc_0.1_hlg_0.6
flags set:
no xwayland

However, these crashes go back to 9203533 as the first bad commit.

[vaxerski]

this has to be a miscompiled binary...

[tekstryder]

I'd think bigger issues would manifest during multi-day session use were that the case.

With the exit dispatcher crashing due to the AQ bug, I'd gotten in the habit of terminating my session with loginctl.

Exiting with loginctl terminate-user tekstryder with today's git triggerd another crash during teardown of processes:

Dec 22 11:13:12 systemd[1]: session-1.scope: Killing process 933 (login) with signal SIGTERM.
Dec 22 11:13:12 systemd[1]: session-1.scope: Killing process 1113 (start-hyprland) with signal SIGTERM.
Dec 22 11:13:12 systemd[1]: session-1.scope: Killing process 1128 (Hyprland) with signal SIGTERM.
Dec 22 11:13:12 systemd[1]: session-1.scope: Killing process 1152 (hypridle) with signal SIGTERM.
Dec 22 11:13:12 systemd[1]: session-1.scope: Killing process 1153 (gammastep) with signal SIGTERM.
Dec 22 11:13:12 systemd[1]: session-1.scope: Killing process 20022 (foot) with signal SIGTERM.
Dec 22 11:13:12 systemd[1]: session-1.scope: Killing process 20024 (bash) with signal SIGTERM.
Dec 22 11:13:12 systemd[1]: session-1.scope: Killing process 20057 (loginctl) with signal SIGTERM.
Dec 22 11:13:12 systemd[1]: session-1.scope: Killing process 20058 (pkttyagent) with signal SIGTERM.
Dec 22 11:13:12 systemd[1]: Stopping Session 1 of User tekstryder...
Dec 22 11:13:12 systemd-coredump[20063]: Process 1113 (start-hyprland) of user 1000 terminated abnormally with signal 6/ABRT, proc>
Dec 22 11:13:12 systemd[1]: Created slice Slice /system/systemd-coredump.
Dec 22 11:13:12 systemd[1]: Started Process Core Dump (PID 20063/UID 0).
Dec 22 11:13:12 systemd-coredump[20065]: [🡕] Process 1113 (start-hyprland) of user 1000 dumped core.
                                         
                                         Stack trace of thread 1113:
                                         #0  0x00007ffbaea9890c n/a (libc.so.6 + 0x9890c)
                                         #1  0x00007ffbaea3e3a0 raise (libc.so.6 + 0x3e3a0)
                                         #2  0x00007ffbaea2557a abort (libc.so.6 + 0x2557a)
                                         #3  0x00007ffbaee97bf6 _ZN9__gnu_cxx27__verbose_terminate_handlerEv (libstdc++.so.6 + 0x9>
                                         #4  0x00007ffbaeeb1eba _ZN10__cxxabiv111__terminateEPFvvE (libstdc++.so.6 + 0xb1eba)
                                         #5  0x00007ffbaee975d9 _ZSt9terminatev (libstdc++.so.6 + 0x975d9)
                                         #6  0x000055e1077f7397 n/a (/usr/bin/start-hyprland (deleted) + 0x1e397)
                                         #7  0x000055e1077f5b02 n/a (/usr/bin/start-hyprland (deleted) + 0x1cb02)
                                         #8  0x00007ffbaea3e4d0 n/a (libc.so.6 + 0x3e4d0)
                                         #9  0x00007ffbaea9f002 n/a (libc.so.6 + 0x9f002)
                                         #10 0x00007ffbaea9316c n/a (libc.so.6 + 0x9316c)
                                         #11 0x00007ffbaea931b4 n/a (libc.so.6 + 0x931b4)
                                         #12 0x00007ffbaeb0d4ae __poll (libc.so.6 + 0x10d4ae)
                                         #13 0x000055e1077e2844 n/a (/usr/bin/start-hyprland (deleted) + 0x9844)
                                         #14 0x000055e1077dfea3 n/a (/usr/bin/start-hyprland (deleted) + 0x6ea3)
                                         #15 0x00007ffbaea27635 n/a (libc.so.6 + 0x27635)
                                         #16 0x00007ffbaea276e9 __libc_start_main (libc.so.6 + 0x276e9)
                                         #17 0x000055e1077e0405 n/a (/usr/bin/start-hyprland (deleted) + 0x7405)
                                         ELF object binary architecture: AMD x86-64
Dec 22 11:13:12 login[933]: pam_unix(login:session): session closed for user tekstryder
Dec 22 11:13:12 systemd[1]: systemd-coredump@0-1-20063_20064-0.service: Deactivated successfully.
Dec 22 11:13:12 systemd[1]: [email protected]: Deactivated successfully.
Dec 22 11:13:12 systemd[1]: session-1.scope: Deactivated successfully.
Dec 22 11:13:12 systemd[1]: Stopped Session 1 of User tekstryder.
Dec 22 11:13:12 systemd[1]: session-1.scope: Consumed 1min 1.626s CPU time over 4min 32.662s wall clock time, 3.2G memory peak.
Dec 22 11:13:12 systemd[1]: [email protected]: Scheduled restart job, restart counter is at 1.
Dec 22 11:13:12 systemd[1]: Started Getty on tty1.
Dec 22 11:13:12 systemd[1]: Stopping User Manager for UID 1000...
Dec 22 11:13:12 systemd-logind[874]: Removed session 1.
Dec 22 11:13:12 systemd[1100]: Activating special unit Exit the Session...
Dec 22 11:13:12 systemd[1100]: Stopped target Main User Target.

Doesn't crash every time, so not 100% reproducible.

But, start-hyprland seems to be sensitive to getting killed off thusly.

Looking forward to trying out hyprshutdown soon!

[vaxerski]

can't do much there when the binary is stripped of any symbols. Please build in debug and reproduce.

[tekstryder]

Nothing to do with loginctl after all.

Exit dispatcher in debug mode:

#0  __pthread_kill_implementation (threadid=<optimized out>, signo=signo@entry=6, no_tid=no_tid@entry=0) at pthread_kill.c:44
        tid = <optimized out>
        ret = 0
        pd = <optimized out>
        old_mask = {__val = {1}}
        ret = <optimized out>
#1  0x00007f76bb2989d3 in __pthread_kill_internal (threadid=<optimized out>, signo=6) at pthread_kill.c:89
No locals.
#2  0x00007f76bb23e3a0 in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
        ret = <optimized out>
#3  0x00007f76bb22557a in __GI_abort () at abort.c:77
        act = {__sigaction_handler = {sa_handler = 0x7ffe4ddddd10, sa_sigaction = 0x7ffe4ddddd10}, sa_mask = {__val = {140147922890097, 45, 45, 140147930800128, 140147924440288, 0, 0, 140730204806512, 140147922835355, 13408, 1, 140730204806432, 45, 1, 45, 116570704}}, 
          sa_flags = 116570716, sa_restorer = 0x7f76bba1a000 <_rtld_global>}
#4  0x00007f76bb697bf6 in __gnu_cxx::__verbose_terminate_handler () at /usr/src/debug/gcc/gcc/libstdc++-v3/libsupc++/vterminate.cc:95
        terminating = true
        t = <optimized out>
#5  0x00007f76bb6b1eba in __cxxabiv1::__terminate (handler=<optimized out>) at /usr/src/debug/gcc/gcc/libstdc++-v3/libsupc++/eh_terminate.cc:48
No locals.
#6  0x00007f76bb6975d9 in std::terminate () at /usr/src/debug/gcc/gcc/libstdc++-v3/libsupc++/eh_terminate.cc:58
No locals.
#7  0x000000000041dd07 in std::__terminate () at /usr/include/c++/15.2.1/x86_64-pc-linux-gnu/bits/c++config.h:352
No locals.
#8  std::thread::~thread (this=0x6f2ba68) at /usr/include/c++/15.2.1/bits/std_thread.h:184
No locals.
#9  CHyprlandInstance::~CHyprlandInstance (this=0x6f2ba50) at /usr/src/debug/hyprland/Hyprland/start/src/core/Instance.hpp:11
No locals.
#10 std::default_delete<CHyprlandInstance>::operator() (this=<optimized out>, __ptr=0x6f2ba50) at /usr/include/c++/15.2.1/bits/unique_ptr.h:92
No locals.
#11 Hyprutils::Memory::CUniquePointer<CHyprlandInstance>::CUniquePointer(CHyprlandInstance*)::{lambda(void*)#1}::operator()(void*) const (__closure=0x0, p=0x6f2ba50) at /usr/include/hyprutils/memory/UniquePtr.hpp:25
No locals.
#12 Hyprutils::Memory::CUniquePointer<CHyprlandInstance>::CUniquePointer(CHyprlandInstance*)::{lambda(void*)#1}::_FUN(void*) () at /usr/include/hyprutils/memory/UniquePtr.hpp:25
No locals.
#13 0x000000000041ddae in Hyprutils::Memory::Impl_::impl_base::_destroy (this=0x6f2ba80) at /usr/include/hyprutils/memory/ImplBase.hpp:87
No locals.
#14 Hyprutils::Memory::Impl_::impl_base::destroy (this=0x6f2ba80) at /usr/include/hyprutils/memory/ImplBase.hpp:42
No locals.
#15 Hyprutils::Memory::CUniquePointer<CHyprlandInstance>::destroyImpl (this=0x42a498 <g_instance>) at /usr/include/hyprutils/memory/UniquePtr.hpp:125
No locals.
#16 Hyprutils::Memory::CUniquePointer<CHyprlandInstance>::decrement (this=0x42a498 <g_instance>) at /usr/include/hyprutils/memory/UniquePtr.hpp:111
No locals.
#17 0x000000000041c959 in Hyprutils::Memory::CUniquePointer<CHyprlandInstance>::reset (this=0x42a498 <g_instance>) at /usr/include/hyprutils/memory/UniquePtr.hpp:86
No locals.
#18 onSignal (sig=<optimized out>) at /usr/src/debug/hyprland/Hyprland/start/src/main.cpp:27
No locals.
#19 <signal handler called>
No locals.
#20 __syscall_cancel_arch () at ../sysdeps/unix/sysv/linux/x86_64/syscall_cancel.S:56
No locals.
#21 0x00007f76bb29316c in __internal_syscall_cancel (a1=a1@entry=140730204810160, a2=a2@entry=2, a3=a3@entry=-1, a4=a4@entry=0, a5=a5@entry=0, a6=a6@entry=0, nr=7) at cancellation.c:49
        result = <optimized out>
        pd = <optimized out>
        ch = <optimized out>
#22 0x00007f76bb2931b4 in __syscall_cancel (a1=a1@entry=140730204810160, a2=a2@entry=2, a3=a3@entry=-1, a4=a4@entry=0, a5=a5@entry=0, a6=a6@entry=0, nr=7) at cancellation.c:75
        r = <optimized out>
#23 0x00007f76bb30d4ae in __GI___poll (fds=fds@entry=0x7ffe4dddebb0, nfds=nfds@entry=2, timeout=timeout@entry=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
No locals.
#24 0x0000000000409734 in poll (__fds=0x7ffe4dddebb0, __nfds=2, __timeout=-1) at /usr/include/bits/poll2.h:44
No locals.
#25 CHyprlandInstance::run (this=0x6f2ba50, safeMode=safeMode@entry=false) at /usr/src/debug/hyprland/Hyprland/start/src/core/Instance.cpp:142
        ret = <optimized out>
        pipefds = {5, 6}
        pollfds = {{fd = 5, events = 1, revents = 0}, {fd = 3, events = 1, revents = 0}}
#26 0x0000000000406e54 in main (argc=1, argv=0x7ffe4dddedb8, envp=<optimized out>) at /usr/src/debug/hyprland/Hyprland/start/src/main.cpp:83
        RET = <optimized out>
        startArgv = <optimized out>
        safeMode = false

[vaxerski]

I mean you seem to be sending a signal to start-hyprland? Anyways, I've fixed this. In the future, send a SIGTERM to hyprland. NOT start-hyprland

[tekstryder]

Look at you go on the holiday haha.

Thanks for fixing damn near every single issue I've ever filed!

In the spirit of 12 days of Christmas I exited Hyprland 12 times, 6ea with loginctl and exit dispatcher.

No coredump. Looks like this one is resolved.

you seem to be sending a signal to start-hyprland

Not sure what you mean here. I start hyprland from TTY with start-hyprland and I exit either via loginctl or the exit dispatcher.

No UWSM. It's even disabled in my builds...

-DNO_UWSM:STRING=true \

... tho doesn't show up as a flag in version output.

Hyprland 0.52.0 built from branch main at commit 25250527793eb04bb60f103abe7f06370b9f6e1c dirty (start: avoid crash in dtor after forceQuit).
Date: Wed Dec 24 14:27:00 2025
Tag: v0.52.0-183-g252505277, commits: 6742

Libraries:
Hyprgraphics: built against 0.4.0, system has 0.4.0
Hyprutils: built against 0.11.0, system has 0.11.0
Hyprcursor: built against 0.1.13, system has 0.1.13
Hyprlang: built against 0.6.7, system has 0.6.7
Aquamarine: built against 0.10.0, system has 0.10.0

Version ABI string: 25250527793eb04bb60f103abe7f06370b9f6e1c_aq_0.10_hu_0.11_hg_0.4_hc_0.1_hlg_0.6
flags set:
no xwayland

EDIT: Perhaps something odd happens due to my launching via a specific TTY from ~/.bash_profile?

[[ -f ~/.bashrc ]] && . ~/.bashrc
# If running from tty1 start Hyprland
[ "$(tty)" = "/dev/tty1" ] && exec start-hyprland