.
Thread 3 (Thread 0x7f336ba41700 (LWP 6654)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
No locals.
#1  0x00007f336bae06d3 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
No symbol table info available.
#2  0x00007f33717dce9a in start_thread (arg=0x7f336ba41700) at pthread_create.c:308
        __res = <optimized out>
        pd = 0x7f336ba41700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, -6469802144379734817, 139858924169344, 139858825976256, 0, 3, 6363712109360936159, 6363665171854882015}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = 0
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#3  0x00007f3372e6b39d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
No locals.
#4  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 2 (Thread 0x7f336b240700 (LWP 6655)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
No locals.
#1  0x00007f336bae06d3 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
No symbol table info available.
#2  0x00007f33717dce9a in start_thread (arg=0x7f336b240700) at pthread_create.c:308
        __res = <optimized out>
        pd = 0x7f336b240700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, -6469802144379734817, 139858924169344, 139858817583552, 0, 3, 6363713256654075103, 6363665171854882015}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = 0
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#3  0x00007f3372e6b39d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
No locals.
#4  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 1 (Thread 0x7f337431f8c0 (LWP 6653)):
#0  ____longjmp_chk () at ../sysdeps/unix/sysv/linux/x86_64/____longjmp_chk.S:116
No locals.
#1  0xba6fd31b529d3497 in ?? ()
No symbol table info available.
Cannot access memory at address 0xba6fd31b529d3497