Bug 1652274

More detailled backtrace:
(gdb) bt
#0  0x00007ffff76c453f in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#1  0x00007ffff76ae895 in __GI_abort () at abort.c:79
#2  0x00007ffff7707927 in __libc_message (action=action@entry=do_abort, fmt=fmt@entry=0x7ffff7815299 "%s\n") at ../sysdeps/posix/libc_fatal.c:181
#3  0x00007ffff770e25c in malloc_printerr (str=str@entry=0x7ffff7816f30 "double free or corruption (fasttop)") at malloc.c:5354
#4  0x00007ffff770fc07 in _int_free (av=0x7ffff784cc60 <main_arena>, p=0x555556a56850, have_lock=<optimized out>) at malloc.c:4230
#5  0x00007ffff71b02a8 in ms_dri2_schedule_wait_msc (client=0x555555dbf690, draw=0x555555dc92a0, target_msc=0, divisor=1, remainder=0) at dri2.c:809
#6  0x00005555556dd6b5 in DRI2WaitMSC (client=client@entry=0x555555dbf690, pDraw=0x555555dc92a0, target_msc=0, divisor=1, remainder=0) at dri2.c:1269
#7  0x00005555556deaa9 in ProcDRI2WaitMSC (client=0x555555dbf690) at dri2ext.c:497
#8  0x00005555556deaa9 in ProcDRI2Dispatch (client=0x555555dbf690) at dri2ext.c:625
#9  0x00005555555b0d7e in Dispatch () at dispatch.c:478
#10 0x00005555555b4dc6 in dix_main (argc=12, argv=0x7fffffffe9f8, envp=<optimized out>) at main.c:276
#11 0x00007ffff76b0413 in __libc_start_main (main=
    0x55555559e780 <main>, argc=12, argv=0x7fffffffe9f8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffe9e8)
    at ../csu/libc-start.c:308
#12 0x000055555559e7be in _start () at dri2ext.c:657

Isn't ms_dri2_del_frame_event() already called from the ms_dri2_frame_event_abort() callback when ms_queue_vblank() fails and aborts the sequence ?

I have the same problem but on a virtual arch when trying to startx with virtio / accel3d

[    73.066] (**) Option "_source" "server/udev"
[    73.066] (II) event5  - spice vdagent tablet: is tagged by udev as: Mouse
[    73.066] (II) event5  - spice vdagent tablet: device is a pointer
[    73.066] (II) event5  - spice vdagent tablet: device removed
[    73.115] (**) Option "config_info" "udev:/sys/devices/virtual/input/input6/event5"
[    73.115] (II) XINPUT: Adding extended input device "spice vdagent tablet" (type: MOUSE, id 10)
[    73.116] (**) Option "AccelerationScheme" "none"
[    73.116] (**) spice vdagent tablet: (accel) selected scheme none/0
[    73.116] (**) spice vdagent tablet: (accel) acceleration factor: 2.000
[    73.116] (**) spice vdagent tablet: (accel) acceleration threshold: 4
[    73.117] (II) event5  - spice vdagent tablet: is tagged by udev as: Mouse
[    73.117] (II) event5  - spice vdagent tablet: device is a pointer
[    74.958] (WW) modeset(0): ms_dri2_schedule_wait_msc:795 get vblank counter failed: Invalid argument
[    74.958] (EE) 
[    74.958] (EE) Backtrace:
[    74.959] (EE) 0: /usr/lib/Xorg (xorg_backtrace+0x4d) [0x55e0a99ac26d]
[    74.959] (EE) 1: /usr/lib/Xorg (0x55e0a98fb000+0xb13a9) [0x55e0a99ac3a9]
[    74.961] (EE) 2: /usr/lib/libc.so.6 (0x7fbd1403d000+0x378b0) [0x7fbd140748b0]
[    74.961] (EE) 3: /usr/lib/libc.so.6 (gsignal+0x10f) [0x7fbd1407482f]
[    74.961] (EE) 4: /usr/lib/libc.so.6 (abort+0x125) [0x7fbd1405f672]
[    74.962] (EE) 5: /usr/lib/libc.so.6 (0x7fbd1403d000+0x79e78) [0x7fbd140b6e78]
[    74.962] (EE) 6: /usr/lib/libc.so.6 (0x7fbd1403d000+0x8078a) [0x7fbd140bd78a]
[    74.962] (EE) 7: /usr/lib/libc.so.6 (0x7fbd1403d000+0x82007) [0x7fbd140bf007]
[    74.962] (EE) 8: /usr/lib/xorg/modules/drivers/modesetting_drv.so (0x7fbd14206000+0x14118) [0x7fbd1421a118]
[    74.963] (EE) 9: /usr/lib/Xorg (DRI2WaitMSC+0x71) [0x55e0a993a961]
[    74.963] (EE) 10: /usr/lib/Xorg (0x55e0a98fb000+0x41ba9) [0x55e0a993cba9]
[    74.963] (EE) 11: /usr/lib/Xorg (0x55e0a98fb000+0x37fe8) [0x55e0a9932fe8]
[    74.964] (EE) 12: /usr/lib/libc.so.6 (__libc_start_main+0xf3) [0x7fbd14060ce3]
[    74.964] (EE) 13: /usr/lib/Xorg (_start+0x2e) [0x55e0a993330e]
[    74.965] (EE) 
[    74.966] (EE) 
Fatal server error:
[    74.966] (EE) Caught signal 6 (Aborted). Server aborting
[    74.966] (EE) 
[    74.966] (EE) 
Please consult the The X.Org Foundation support 
	 at http://wiki.x.org
 for help. 
[    74.966] (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
[    74.967] (EE) 
[    74.968] (II) AIGLX: Suspending AIGLX clients for VT switch
[    74.988] (EE) Server terminated with error (1). Closing log file.

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