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Bug#813716: X crashes indeed



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I see the same behaviour. It reproduces randomly two or three times a
workday. The gdb bt and info threads output and reportbug output are
attached.
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Attachment: reportbug-xserver-xorg-core-backup-20160211-32654-VtQoOr
Description: Binary data

Program received signal SIGBUS, Bus error.
_int_malloc (av=av@entry=0x7fc17df58c00 <main_arena>, bytes=bytes@entry=24) at malloc.c:3483
3483    malloc.c: No such file or directory.
(gdb) bt
#0  _int_malloc (av=av@entry=0x7fc17df58c00 <main_arena>, bytes=bytes@entry=24) at malloc.c:3483
#1  0x00007fc17dc348ee in __GI___libc_malloc (bytes=bytes@entry=24) at malloc.c:2895
#2  0x000055eb270fab08 in AddResource (id=1105209823, type=type@entry=536870921, value=value@entry=0x55eb29515010) at ../../dix/resource.c:831
#3  0x000055eb270f086a in AddPassiveGrabToList (client=client@entry=0x55eb28f10b00, pGrab=0x55eb29515010) at ../../dix/grabs.c:566
#4  0x000055eb270e4419 in ProcGrabKey (client=0x55eb28f10b00) at ../../dix/events.c:5523
#5  0x000055eb270d5a3f in Dispatch () at ../../dix/dispatch.c:430
#6  0x000055eb270d9a53 in dix_main (argc=7, argv=0x7ffe2e38f1a8, envp=<optimized out>) at ../../dix/main.c:300
#7  0x00007fc17dbda870 in __libc_start_main (main=0x55eb270c3db0 <main>, argc=7, argv=0x7ffe2e38f1a8, init=<optimized out>, 
    fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffe2e38f198) at libc-start.c:291
#8  0x000055eb270c3de9 in _start ()

(gdb) info threads
  Id   Target Id         Frame
  4    Thread 0x7fc17933a700 (LWP 3316) "Xorg" pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
  3    Thread 0x7fc178b39700 (LWP 3317) "Xorg" pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
  2    Thread 0x7fc178338700 (LWP 3318) "Xorg" pthread_cond_wait@@GLIBC_2.3.2 ()
    at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
* 1    Thread 0x7fc17fe16a00 (LWP 3067) "Xorg" _int_malloc (
    av=av@entry=0x7fc17df58c00 <main_arena>, bytes=bytes@entry=24) at malloc.c:3483

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