10997 2009-11-22 14:30:00 +0000 Xserver segfaults when Composite used 2010-02-19 19:20:07 +0000 1 1 1 Unclassified cygwin Cygwin/X unspecified All All RESOLVED FIXED P2 normal --- 1 jon.turney yselkowitz 39980 jon.turney 2009-11-22 14:30:06 +0000 A few reports of Xserver segfaults when using a XDMCP session to Fedora 12 (Constantine) and Ubuntu 9.10 (Karmic) http://cygwin.com/ml/cygwin-xfree/2009-11/msg00152.html http://cygwin.com/ml/cygwin-xfree/2009-11/msg00000.html This seems to be due to a bad interaction between the damage tracking for the Composite extension and damage tracking for the shadow framebuffer. Where I have been able to reproduce the problem, disabling the composite extension with '-extension Composite' works around it. It's not clear why this hasn't bitten us before: nothing obviously relevant has changed in Xserver 1.7, but maybe we were just lucky, or it may be that Gnome in recent linux distros makes more extensive use of composite which tickles the bug. 39981 jon.turney 2009-11-22 14:31:35 +0000 Possibly relevant upstream report: http://lists.freedesktop.org/archives/xorg/2005-September/010150.html 39982 jon.turney 2009-11-22 14:32:24 +0000 A simple way to demonstrate this problem: - start xserver - start xcompmgr - start xterm - exit xterm 39983 4405 jon.turney 2009-11-22 14:55:51 +0000 Created attachment 4405 Patch to disable composite extension by default This looks like a fairly complex problem to solve, so perhaps as an interim measure disable compsite by default to stop XDMCP users tripping over this issue. We did discuss this back at http://sourceforge.net/mailarchive/forum.php?thread_name=4908A723.10405%40users.sourceforge.net&forum_name=cygwin-ports-general Updated patch attached 40033 yselkowitz 2009-11-24 02:40:58 +0000 Might this be related? http://bugs.freedesktop.org/show_bug.cgi?id=25136 40358 yselkowitz 2009-12-14 04:11:27 +0000 Confirmed. Composite was working fine before, so this is clearly a change in the server. I suspect Keith's 6 patches in master (d3e054a..a72c65e) may fix this, but they haven't been backported to 1.7 yet. In the meantime, as this appears to be completely broken, I'll just disable the Composite extension entirely in configure. 40448 yselkowitz 2009-12-21 03:17:51 +0000 Unfortunately the backported fb patch posted to xorg-devel today doesn't help. :-( FWIW, here's a backtrace of the crash: 0x004cfaf0 in damageRegionAppend (pDrawable=0x1919560, pRegion=0x28cb48, clip=1, subWindowMode=1) at miext/damage/damage.c:290 290 if (pDamage->pDrawable->type == DRAWABLE_WINDOW && (gdb) bt #0 0x004cfaf0 in damageRegionAppend (pDrawable=0x1919560, pRegion=0x28cb48, clip=1, subWindowMode=1) at miext/damage/damage.c:290 #1 0x004cfd81 in damageDamageBox (pDrawable=0x1919560, pBox=<value optimized out>, subWindowMode=<value optimized out>) at miext/damage/damage.c:425 #2 0x004d0334 in damageComposite (op=1 '\001', pSrc=0x1dfefb8, pMask=0x0, pDst=0x1dfe970, xSrc=0, ySrc=0, xMask=0, yMask=0, xDst=0, yDst=0, width=1394, height=992) at miext/damage/damage.c:640 #3 0x00466fc1 in ProcRenderComposite (client=0x1db6830) at render/render.c:723 #4 0x004f05d6 in Dispatch () at dix/dispatch.c:445 #5 0x004e56aa in main (argc=1, argv=0x18b9ba0, envp=0xffffffff) at dix/main.c:285 41404 4580 jon.turney 2010-02-08 21:44:37 +0000 Created attachment 4580 Don't enable ROOTLESS_WORKAROUND, it breaks Composite 41426 yselkowitz 2010-02-09 20:40:20 +0000 Nice work. Whether that opens up to http://bugs.freedesktop.org/show_bug.cgi? id=1168 will have to be seen, but this would only affect WindowsWM, so I'm not overly concerned. Patch in queue for 1.7.4. 41595 yselkowitz 2010-02-19 19:20:07 +0000 WFM and at least one other person on the list. Patch committed and cherry-picked; closing. 4405 2009-11-22 14:55:00 +0000 2010-02-08 21:44:38 +0000 Patch to disable composite extension by default 0001-Disable-composite-by-default.patch text/plain 654 jon.turney RnJvbSBmODMwZjU2YzAyODU3ZDZhNWUxZjhjMTE3YjEwZDRlYzE3ZWQyMjZiIE1vbiBTZXAgMTcg MDA6MDA6MDAgMjAwMQpGcm9tOiBKb24gVFVSTkVZIDxqb24udHVybmV5QGRyb25lY29kZS5vcmcu dWs+CkRhdGU6IFN1biwgMjIgTm92IDIwMDkgMTQ6NTI6MTMgKzAwMDAKU3ViamVjdDogW1BBVENI XSBEaXNhYmxlIGNvbXBvc2l0ZSBieSBkZWZhdWx0CgpTaWduZWQtb2ZmLWJ5OiBKb24gVFVSTkVZ IDxqb24udHVybmV5QGRyb25lY29kZS5vcmcudWs+Ci0tLQogb3MvdXRpbHMuYyB8ICAgIDIgKy0K IDEgZmlsZXMgY2hhbmdlZCwgMSBpbnNlcnRpb25zKCspLCAxIGRlbGV0aW9ucygtKQoKZGlmZiAt LWdpdCBhL29zL3V0aWxzLmMgYi9vcy91dGlscy5jCmluZGV4IGQ5NDQwOGEuLjM4Nzk0NDkgMTAw NjQ0Ci0tLSBhL29zL3V0aWxzLmMKKysrIGIvb3MvdXRpbHMuYwpAQCAtMTI2LDcgKzEyNiw3IEBA IF9fc3RkY2FsbCB1bnNpZ25lZCBsb25nIEdldFRpY2tDb3VudCh2b2lkKTsKIAogQm9vbCBub1Rl c3RFeHRlbnNpb25zOwogI2lmZGVmIENPTVBPU0lURQotQm9vbCBub0NvbXBvc2l0ZUV4dGVuc2lv biA9IEZBTFNFOworQm9vbCBub0NvbXBvc2l0ZUV4dGVuc2lvbiA9IFRSVUU7CiAjZW5kaWYKIAog I2lmZGVmIERBTUFHRQotLSAKMS42LjQuMgoK 4580 2010-02-08 21:44:00 +0000 2010-02-08 21:44:37 +0000 Don't enable ROOTLESS_WORKAROUND, it breaks Composite 0001-Don-t-enable-ROOTLESS_WORKAROUND-it-breaks-composite.patch text/plain 1005 jon.turney RnJvbSAxOTE0NTcyZGUwOTM0ZGVhNDNhYTBmNmE0ZTQxZGY5M2EyMzIyYTU0IE1vbiBTZXAgMTcg MDA6MDA6MDAgMjAwMQpGcm9tOiBKb24gVFVSTkVZIDxqb24udHVybmV5QGRyb25lY29kZS5vcmcu dWs+CkRhdGU6IE1vbiwgOCBGZWIgMjAxMCAyMTozOToyNSArMDAwMApTdWJqZWN0OiBbUEFUQ0hd IERvbid0IGVuYWJsZSBST09UTEVTU19XT1JLQVJPVU5ELCBpdCBicmVha3MgY29tcG9zaXRlCgpU aGlzIHBvc3NpYmx5IGJyaW5ncyBiYWNrIHdoYXRldmVyIHRoZSBidWcgaXMgaW4KaHR0cDovL2J1 Z3MuZnJlZWRlc2t0b3Aub3JnL3Nob3dfYnVnLmNnaT9pZD0xMTY4IGZvcgotcm9vdGxlc3MgbW9k ZSwgYnV0IHNpbmNlIHdlIGRvbid0IGhhdmUgcmVwcm9kdWN0aW9uCnN0ZXBzIGZvciB0aGF0LCBJ IGNhbid0IHRlc3QgdGhhdC4uLgoKU2lnbmVkLW9mZi1ieTogSm9uIFRVUk5FWSA8am9uLnR1cm5l eUBkcm9uZWNvZGUub3JnLnVrPgotLS0KIGNvbmZpZ3VyZS5hYyB8ICAgIDEgLQogMSBmaWxlcyBj aGFuZ2VkLCAwIGluc2VydGlvbnMoKyksIDEgZGVsZXRpb25zKC0pCgpkaWZmIC0tZ2l0IGEvY29u ZmlndXJlLmFjIGIvY29uZmlndXJlLmFjCmluZGV4IGVjOTQ0MmIuLmEyY2IzODIgMTAwNjQ0Ci0t LSBhL2NvbmZpZ3VyZS5hYworKysgYi9jb25maWd1cmUuYWMKQEAgLTE4MzYsNyArMTgzNiw2IEBA IGlmIHRlc3QgIngkWFdJTiIgPSB4eWVzOyB0aGVuCiAJCQlkbmwgaWYgd2UgaGF2ZSB3aW5kb3dz d21wcm90bywgYnVpbGQgcm9vdGxlc3MgZXh0ZW5zaW9uIGZvciBtdWx0d2luZG93ZXh0d20gbW9k ZQogCQkJaWYgdGVzdCAieCRXSU5ET1dTV00iID0geHllcyA7IHRoZW4KIAkJCSAgICAgICBBQ19E RUZJTkUoUk9PVExFU1MsMSxbQnVpbGQgUm9vdGxlc3MgY29kZV0pCi0JCQkgICAgICAgQ0ZMQUdT PSIkQ0ZMQUdTIC1EUk9PVExFU1NfV09SS0FST1VORCIKIAkJCWZpCiAKIAkJCUNGTEFHUz0iJENG TEFHUyAtREZEX1NFVFNJWkU9MjU2IgotLSAKMS42LjYuMQoK