Several reporters are finding the Backingstore option causes crashes on a range of different hardware: https://bugs.edge.launchpad.net/ubuntu/+source/xorg-server/+bug/274988 Below is a backtrace from the crash. Is this option supposed to work reliably? If not, perhaps it should be deprecated? Program received signal SIGSEGV, Segmentation fault. [Switching to Thread 0x7fe72afc46e0 (LWP 11393)] 0x00000000004de71e in miValidateTree (pParent=0x2144a40, pChild=0x7fff32fe79c0, kind=VTMap) at ../../mi/mivaltree.c:790 in ../../mi/mivaltree.c (gdb) backtrace full #0 0x00000000004de71e in miValidateTree (pParent=0x2144a40, pChild=0x7fff32fe79c0, kind=VTMap) at ../../mi/mivaltree.c:790 totalClip = {extents = {x1 = 0, y1 = 24, x2 = 0, y2 = 24}, data = 0x7e1c60} childClip = {extents = {x1 = 0, y1 = 0, x2 = 0, y2 = 0}, data = 0x7e1c60} childUnion = {extents = {x1 = 1, y1 = 0, x2 = 0, y2 = 0}, data = 0x0} exposed = {extents = {x1 = 0, y1 = 0, x2 = 0, y2 = 0}, data = 0x7e1c60} pScreen = (ScreenPtr) 0x20e4a90 pWin = (WindowPtr) 0x0 overlap = 1 viewvals = 0 forward = 855538080 #1 0x00007fe728693813 in DRIValidateTree (pParent=0x2144a40, pChild=0x28daa00, kind=VTMap) at ../../../../hw/xfree86/dri/dri.c:2055 pScreen = (ScreenPtr) 0x20e4a90 returnValue = <value optimized out> #2 0x0000000000438e67 in MapWindow (pWin=0x28daa00, client=<value optimized out>) at ../../dix/window.c:2811 event = {u = {u = {type = 19 '\023', detail = 123 '{', sequenceNumber = 1236}, keyButtonPointer = {pad00 = 81034003, time = 104, root = 52429243, event = 1, child = 36695712, rootX = 0, rootY = 0, eventX = 22480, eventY = 126, state = 0, sameScreen = 0 '\0', pad1 = 0 '\0'}, enterLeave = {pad00 = 81034003, time = 104, root = 52429243, event = 1, child = 36695712, rootX = 0, rootY = 0, eventX = 22480, eventY = 126, state = 0, mode = 0 '\0', flags = 0 '\0'}, focus = {pad00 = 81034003, window = 104, mode = 187 '»', pad1 = 1 '\001', pad2 = 32 ' ', pad3 = 3 '\003'}, expose = {pad00 = 81034003, window = 104, x = 443, y = 800, width = 1, height = 0, count = 61088, pad2 = 559}, graphicsExposure = { pad00 = 81034003, drawable = 104, x = 443, y = 800, width = 1, height = 0, minorEvent = 61088, count = 559, majorEvent = 0 '\0', pad1 = 0 '\0', pad2 = 0 '\0', pad3 = 0 '\0'}, noExposure = { pad00 = 81034003, drawable = 104, minorEvent = 443, majorEvent = 32 ' ', bpad = 3 '\003'}, visibility = {pad00 = 81034003, window = 104, state = 187 '»', pad1 = 1 '\001', pad2 = 32 ' ', pad3 = 3 '\003'}, createNotify = {pad00 = 81034003, parent = 104, window = 52429243, x = 1, y = 0, width = 61088, height = 559, borderWidth = 0, override = 0 '\0', bpad = 0 '\0'}, destroyNotify = { pad00 = 81034003, event = 104, window = 52429243}, unmapNotify = { pad00 = 81034003, event = 104, window = 52429243, fromConfigure = 1 '\001', pad1 = 0 '\0', pad2 = 0 '\0', pad3 = 0 '\0'}, mapNotify = {pad00 = 81034003, event = 104, window = 52429243, override = 1 '\001', pad1 = 0 '\0', pad2 = 0 '\0', pad3 = 0 '\0'}, mapRequest = {pad00 = 81034003, parent = 104, window = 52429243}, reparent = {pad00 = 81034003, event = 104, window = 52429243, parent = 1, x = -4448, y = 559, override = 0 '\0', pad1 = 0 '\0', pad2 = 0 '\0', pad3 = 0 '\0'}, configureNotify = {pad00 = 81034003, event = 104, window = 52429243, aboveSibling = 1, x = -4448, y = 559, width = 0, height = 0, borderWidth = 22480, override = 126 '~', bpad = 0 '\0'}, configureRequest = {pad00 = 81034003, parent = 104, window = 52429243, sibling = 1, x = -4448, y = 559, width = 0, height = 0, borderWidth = 22480, valueMask = 126, pad1 = 0}, gravity = { pad00 = 81034003, event = 104, window = 52429243, x = 1, y = 0, pad1 = 36695712, pad2 = 0, pad3 = 8280016, pad4 = 0}, resizeRequest = { pad00 = 81034003, window = 104, width = 443, height = 800}, circulate = {pad00 = 81034003, event = 104, window = 52429243, parent = 1, place = 160 ' ', pad1 = 238 'î', pad2 = 47 '/', pad3 = 2 '\002'}, property = {pad00 = 81034003, window = 104, atom = 52429243, time = 1, state = 160 ' ', pad1 = 238 'î', pad2 = 559}, selectionClear = {pad00 = 81034003, time = 104, window = 52429243, atom = 1}, selectionRequest = {pad00 = 81034003, time = 104, owner = 52429243, requestor = 1, selection = 36695712, target = 0, property = 8280016}, selectionNotify = {pad00 = 81034003, time = 104, requestor = 52429243, selection = 1, target = 36695712, property = 0}, colormap = {pad00 = 81034003, window = 104, colormap = 52429243, new = 1 '\001', state = 0 '\0', pad1 = 0 '\0', pad2 = 0 '\0'}, mappingNotify = {pad00 = 81034003, request = 104 'h', firstKeyCode = 0 '\0', count = 0 '\0', pad1 = 0 '\0'}, clientMessage = { pad00 = 81034003, window = 104, u = {l = {type = 52429243, longs0 = 1, longs1 = 36695712, longs2 = 0, longs3 = 8280016, longs4 = 0}, s = { type = 52429243, shorts0 = 1, shorts1 = 0, shorts2 = -4448, shorts3 = 559, shorts4 = 0, shorts5 = 0, shorts6 = 22480, shorts7 = 126, shorts8 = 0, shorts9 = 0}, b = {type = 52429243, bytes = "\001\000\000\000 î/\002\000\000\000\000ÐW~\000\000\000\000"}}}}} anyMarked = 1 win_owner = (ClientPtr) 0x28bba10 ag_leader = (ClientPtr) 0x0 pScreen = (ScreenPtr) 0x20e4a90 pParent = <value optimized out> dosave = 0 pLayerWin = (WindowPtr) 0x28daa00 #3 0x000000000044cf66 in ProcMapWindow (client=0x28bba10) at ../../dix/dispatch.c:695 pWin = (WindowPtr) 0x28daa00 rc = 0 #4 0x000000000044d7a4 in Dispatch () at ../../dix/dispatch.c:454 result = <value optimized out> client = (ClientPtr) 0x28bba10 nready = 0 start_tick = 800 #5 0x000000000043378d in main (argc=10, argv=0x7fff32fe7ca8, envp=<value optimized out>) at ../../dix/main.c:441 i = 1 error = 0 xauthfile = <value optimized out> alwaysCheckForInput = {0, 1} (gdb) quit The program is running. Quit anyway (and detach it)? (y or n) Detaching from program: /usr/bin/Xorg, process 11393
Created attachment 24481 [details] Xorg.0.log I have a similar problem with backingstore option enabled using kde4.2.1 under xorg 7.4 (xorg-server-1.5.3) xf86-video-ati-6.10.0. I'm using a radeon 9250 (r200 based) card. When some dialog pop up or when i drag and drop a plasmoid to the desktop Xorg crash with segfault (the log is obtained in latter case). If i disable desktop effect Xorg crash at login. If i disable backingstore the issue is not present.
I think this is fixed since 1.6. The backtrace seems to point into the old dix save-under code, which no longer exists as of 1.6 (but did in 1.5, when these backtraces seem to originate).
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