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My previous report:
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1482312

After latest xorg-server update previous crash seems like doesn't happen anymore, however there is another crash now:
[  3184.619] failed to map pixmap: -2
[  3184.619] (EE) 
[  3184.619] (EE) Backtrace:
[  3184.619] (EE) 0: /usr/bin/X (xorg_backtrace+0x4e) [0x55951956662e]
[  3184.620] (EE) 1: /usr/bin/X (0x5595193b2000+0x1b8999) [0x55951956a999]
[  3184.620] (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (0x7fbac39c7000+0x352f0) [0x7fbac39fc2f0]
[  3184.620] (EE) 3: /lib/x86_64-linux-gnu/libc.so.6 (0x7fbac39c7000+0x9ff70) [0x7fbac3a66f70]
[  3184.620] (EE) 4: /usr/lib/xorg/modules/libexa.so (0x7fbabfa92000+0x52fe) [0x7fbabfa972fe]
[  3184.620] (EE) 5: /usr/lib/xorg/modules/libexa.so (0x7fbabfa92000+0x57b3) [0x7fbabfa977b3]
[  3184.620] (EE) 6: /usr/lib/xorg/modules/libexa.so (0x7fbabfa92000+0x7e8f) [0x7fbabfa99e8f]
[  3184.620] (EE) 7: /usr/lib/xorg/modules/libexa.so (0x7fbabfa92000+0x10555) [0x7fbabfaa2555]
[  3184.620] (EE) 8: /usr/bin/X (miCopyRegion+0xdc) [0x55951954663c]
[  3184.620] (EE) 9: /usr/bin/X (miDoCopy+0x466) [0x559519546cb6]
[  3184.620] (EE) 10: /usr/lib/xorg/modules/libexa.so (0x7fbabfa92000+0x8345) [0x7fbabfa9a345]
[  3184.620] (EE) 11: /usr/bin/X (0x5595193b2000+0x13f941) [0x5595194f1941]
[  3184.621] (EE) 12: /usr/bin/X (0x5595193b2000+0xf48ec) [0x5595194a68ec]
[  3184.621] (EE) 13: /usr/bin/X (0x5595193b2000+0xf5ef5) [0x5595194a7ef5]
[  3184.621] (EE) 14: /usr/bin/X (0x5595193b2000+0x5818f) [0x55951940a18f]
[  3184.621] (EE) 15: /usr/bin/X (0x5595193b2000+0x5c34b) [0x55951940e34b]
[  3184.621] (EE) 16: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf0) [0x7fbac39e7a40]
[  3184.621] (EE) 17: /usr/bin/X (_start+0x29) [0x5595193f86c9]
[  3184.621] (EE) 
[  3184.621] (EE) Segmentation fault at address 0x0
[  3184.621] (EE) 
Fatal server error:
[  3184.621] (EE) Caught signal 11 (Segmentation fault). Server aborting

Also dmesg is full of radeon driver related errors:
[ 2859.128902] [drm:radeon_cs_ioctl [radeon]] *ERROR* Invalid command stream !
[ 2859.142511] radeon 0000:00:01.0: evergreen_surface_check_linear_aligned:212 texture pitch 624 invalid must be aligned with 64
[ 2859.142530] radeon 0000:00:01.0: evergreen_cs_track_validate_texture:827 texture invalid 0x09d81341 0x10000390 0x0a0a0000 0x00000000 0x00000004 0x8002001a

Logs attached.

** Affects: xorg (Ubuntu)
     Importance: Low
         Status: Incomplete

-- 
Crash in libexa with radeon driver
https://bugs.launchpad.net/bugs/1493449
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