SmatZ opened the ticket and wrote:

r18780

OTTD sometimes deadlocks at startup, probably related to threaded SDL

(gdb) info threads
4 Thread 0x7fffee864710 (LWP 8144) 0x00007ffff78c1aec in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
2 Thread 0x7fffefb35710 (LWP 7990) 0x00007ffff3c99c36 in poll () from /lib/libc.so.6
* 1 Thread 0x7ffff7fbc720 (LWP 7933) 0x00007ffff78be2e5 in pthread_join () from /lib/libpthread.so.0
(gdb) thread 1
[Switching to thread 1 (Thread 0x7ffff7fbc720 (LWP 7933))]# 0 0x00007ffff78be2e5 in pthread_join () from /lib/libpthread.so.0
(gdb) bt
# 0 0x00007ffff78be2e5 in pthread_join () from /lib/libpthread.so.0
# 1 0x00000000007c774b in ThreadObject_pthread::Join (this=0xe7cdf0) at /home/smatz/openttd-rev/src/thread/thread_pthread.cpp:51
# 2 0x0000000000818179 in VideoDriver_SDL::MainLoop (this=0xd70ca0) at /home/smatz/openttd-rev/src/video/sdl_v.cpp:605
# 3 0x00000000006e168b in ttd_main (argc=1, argv=0x7fffffffdc38) at /home/smatz/openttd-rev/src/openttd.cpp:752
# 4 0x00000000006f0ec2 in main (argc=1, argv=0x7fffffffdc38) at /home/smatz/openttd-rev/src/os/unix/unix.cpp:256
(gdb) thread 2
[Switching to thread 2 (Thread 0x7fffefb35710 (LWP 7990))]# 0 0x00007ffff3c99c36 in poll () from /lib/libc.so.6
(gdb) bt
# 0 0x00007ffff3c99c36 in poll () from /lib/libc.so.6
# 1 0x00007ffff03c3e10 in ?? () from /usr/lib/libasound.so.2
# 2 0x00007ffff03c40b3 in ?? () from /usr/lib/libasound.so.2
# 3 0x00007ffff03d00cb in snd_pcm_mmap_writei () from /usr/lib/libasound.so.2
# 4 0x00007ffff65e4eb8 in ?? () from /usr/lib/libSDL-1.2.so.0
# 5 0x00007ffff65b3cba in ?? () from /usr/lib/libSDL-1.2.so.0
# 6 0x00007ffff65bd127 in ?? () from /usr/lib/libSDL-1.2.so.0
# 7 0x00007ffff65ff689 in ?? () from /usr/lib/libSDL-1.2.so.0
# 8 0x00007ffff78bcb5c in start_thread () from /lib/libpthread.so.0
# 9 0x00007ffff3ca3cfd in clone () from /lib/libc.so.6
# 10 0x0000000000000000 in ?? ()
(gdb) thread 4
[Switching to thread 4 (Thread 0x7fffee864710 (LWP 8144))]# 0 0x00007ffff78c1aec in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
(gdb) bt
# 0 0x00007ffff78c1aec in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
# 1 0x00000000007c73bb in ThreadMutex_pthread::WaitForSignal (this=0xf58920) at /home/smatz/openttd-rev/src/thread/thread_pthread.cpp:128
# 2 0x000000000081748a in DrawSurfaceToScreenThread () at /home/smatz/openttd-rev/src/video/sdl_v.cpp:117
# 3 0x00000000007c77cf in ThreadObject_pthread::ThreadProc (this=0xe7cdf0) at /home/smatz/openttd-rev/src/thread/thread_pthread.cpp:73
# 4 0x00000000007c7889 in ThreadObject_pthread::stThreadProc (thr=0xe7cdf0) at /home/smatz/openttd-rev/src/thread/thread_pthread.cpp:61
# 5 0x00007ffff78bcb5c in start_thread () from /lib/libpthread.so.0
# 6 0x00007ffff3ca3cfd in clone () from /lib/libc.so.6
# 7 0x0000000000000000 in ?? ()
(gdb)

Reported version: trunk
Operating system: All

This issue was imported from FlySpray: https://bugs.openttd.org/task/3521