.
Thread 2 (Thread 0x7fcf9258b700 (LWP 3949)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
No locals.
#1  0x00007fcf92e69b89 in __run__ (arg=0x7fcf9ad0f420) at ../../../src/sna/sna_threads.c:70
        t = 0x7fcf9ad0f420
        signals = {__val = {18446744067267099583, 18446744073709551615 <repeats 15 times>}}
#2  0x00007fcf95cde0a5 in start_thread (arg=0x7fcf9258b700) at pthread_create.c:309
        __res = <optimized out>
        pd = 0x7fcf9258b700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140529490245376, -4603257968262078590, 0, 0, 140529490246080, 140529490245376, 4576455419622367106, 4576460825234677634}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#3  0x00007fcf9688184d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.
.
Thread 1 (Thread 0x7fcf98a239c0 (LWP 3948)):
#0  present_set_tree_pixmap (window=0x0, pixmap=0x7fcf9af421a0) at ../../present/present.c:378
        visit = {old = 0x7fcf9ad0e7d0, new = 0x7fcf9b22d670}
        screen = <error reading variable screen (Cannot access memory at address 0x10)>
#1  0x00007fcf98b88dca in present_unflip (screen=0x7fcf9ad0e7d0) at ../../present/present.c:415
        __PRETTY_FUNCTION__ = "present_unflip"
#2  0x00007fcf98b89c4c in present_flip_notify (crtc_msc=8497, ust=148586335, vblank=0x7fcf9b2df490) at ../../present/present.c:459
        screen = 0x7fcf9ad0e7d0
#3  present_event_notify (event_id=<optimized out>, ust=148586335, msc=8497) at ../../present/present.c:484
        vblank = <optimized out>
        tmp = <optimized out>
        s = <optimized out>
#4  0x00007fcf92ed2d71 in present_flip_handler (sna=<optimized out>, event=<optimized out>, data=0x7fcf9b2df080) at ../../../src/sna/sna_present.c:314
        info = 0x7fcf9b2df080
        swap = <optimized out>
#5  0x00007fcf92e33bc3 in sna_mode_wakeup (sna=sna@entry=0x7fcf9894a000) at ../../../src/sna/sna_display.c:6837
        vbl = 0x7fff421d7180
        crtc = 0x7fcf9ad10670
        e = 0x7fff421d7180
        buffer = "\002\000\000\000 \000\000\000p\006\321\232\317\177\000\000\224\000\000\000_\362\b\000\061!\000\000\000\000\000\000\210\222\352\230\317\177\000\000]j\177\226\317\177\000\000\061\061\000\000\000\000\000\000\377\377\377\377\000\000\000\000\067\000\000\000\000\000\000\000\020r\035B\377\177\000\000\001\000\000\000\000\000\000\000\234^\203\230\317\177\000\000\020r\035B\377\177\000\000P\265\250\020\000\000\000\000\016\000\000\000\000\000\000\000\234^\203\230\317\177\000\000\240\257\320\232\317\177\000\000|`\234|\000\000\000\000\016\000\000\000\000\000\000\000.\000\000\000\000\000\000\000\240\257\320\232\317\177\000\000\026h\203\230\317\177\000\000\200uy\226\317\177\000\000pr\035B\377\177\000\000(\255x\226\317\177\000\000"...
        len = 32
        i = 0
#6  0x00007fcf92e34b88 in sna_mode_reset (sna=0x7fcf9894a000) at ../../../src/sna/sna_display.c:6108
        config = 0x7fcf9ad10580
        i = <optimized out>
#7  0x00007fcf92e36da0 in sna_leave_vt (arg=0x7fcf9ad0ed90) at ../../../src/sna/sna_driver.c:907
        scrn = 0x7fcf9ad0ed90
#8  0x00007fcf98ae90a5 in AbortDDX (error=error@entry=EXIT_ERR_ABORT) at ../../../../hw/xfree86/common/xf86Init.c:1171
        i = 0
#9  0x00007fcf98c137a2 in AbortServer () at ../../os/log.c:783
No locals.
#10 0x00007fcf98c1460d in FatalError (f=f@entry=0x7fcf98c3f6a8 "Caught signal %d (%s). Server aborting\n") at ../../os/log.c:924
        args = {{gp_offset = 24, fp_offset = 48, overflow_arg_area = 0x7fff421d7760, reg_save_area = 0x7fff421d7690}}
        args2 = {{gp_offset = 8, fp_offset = 48, overflow_arg_area = 0x7fff421d7760, reg_save_area = 0x7fff421d7690}}
        beenhere = 1
#11 0x00007fcf98c0b8bc in OsSigHandler (signo=11, sip=<optimized out>, unused=<optimized out>) at ../../os/osinit.c:147
        unused = <optimized out>
        sip = <optimized out>
        signo = 11
#12 <signal handler called>
No locals.
#13 present_set_tree_pixmap (window=0x0, pixmap=0x7fcf9af421a0) at ../../present/present.c:378
        visit = {old = 0x1, new = 0x7fcf96806f03 <_int_free+1651>}
        screen = <error reading variable screen (Cannot access memory at address 0x10)>
#14 0x00007fcf98b88d0c in present_set_abort_flip (screen=0x7fcf9ad0e7d0) at ../../present/present.c:398
No locals.
#15 0x00007fcf98b89493 in present_flip_destroy (screen=screen@entry=0x7fcf9ad0e7d0) at ../../present/present.c:937
No locals.
#16 0x00007fcf98b88243 in present_close_screen (screen=0x7fcf9ad0e7d0) at ../../present/present_screen.c:60
No locals.
#17 0x00007fcf98b3afa8 in CursorCloseScreen (pScreen=0x7fcf9ad0e7d0) at ../../xfixes/cursor.c:187
        ret = <optimized out>
        close_proc = <optimized out>
        display_proc = <optimized out>
#18 0x00007fcf98b868fc in AnimCurCloseScreen (pScreen=<optimized out>) at ../../render/animcur.c:106
        ret = <optimized out>
#19 0x00007fcf98aac3b7 in dix_main (argc=13, argv=0x7fff421d7f28, envp=<optimized out>) at ../../dix/main.c:349
        i = 0
        alwaysCheckForInput = {0, 1}
#20 0x00007fcf967a8ec5 in __libc_start_main (main=0x7fcf98a96680 <main>, argc=13, argv=0x7fff421d7f28, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff421d7f18) at libc-start.c:287
        result = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, -4603257968262078590, 140529596196485, 140734302617376, 0, 0, 4603652430895292290, 4576463924793876354}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x7fcf98c183a0 <__libc_csu_init>, 0x7fff421d7f28}, data = {prev = 0x0, cleanup = 0x0, canceltype = -1732148320}}}
        not_first_call = <optimized out>
#21 0x00007fcf98a966ae in _start ()
No symbol table info available.