(gdb) t 2
[Switching to thread 2 (LWP 24666)]
#0  __cp_end () at src/thread/x86_64/syscall_cp.s:29
29      in src/thread/x86_64/syscall_cp.s
(gdb) bt
#0  __cp_end () at src/thread/x86_64/syscall_cp.s:29
#1  0x00007f08c684066c in __syscall_cp_c (nr=202, u=<optimized out>,
    v=<optimized out>, w=<optimized out>, x=<optimized out>,
    y=<optimized out>, z=0) at src/thread/pthread_cancel.c:33
#2  0x00007f08c683fc69 in __futex4_cp (to=0x0, val=2, op=128,
    addr=0x7f08c5fc4e44) at src/thread/__timedwait.c:24
#3  __timedwait_cp (addr=addr@entry=0x7f08c5fc4e44, val=val@entry=2,
    clk=clk@entry=0, at=at@entry=0x0, priv=128, priv@entry=1)
    at src/thread/__timedwait.c:52
#4  0x00007f08c6840a76 in __pthread_cond_timedwait (
    c=0x562014443320 <work_cond>, m=0x5620144432e0 <work_lock>, ts=0x0)
    at src/thread/pthread_cond_timedwait.c:100
#5  0x0000562014439ef0 in sign_worker (cls=0x0)
    at taler-exchange-secmod-eddsa.c:387
#6  0x00007f08c6841160 in start (p=0x7f08c5fc4ef0)
    at src/thread/pthread_create.c:203
#7  0x00007f08c684331f in __clone () at src/thread/x86_64/clone.s:22
Backtrace stopped: frame did not save the PC
(gdb)