[Bug 106153] KWin crashed when Alt+Tab-ing through open windows

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106153

            Bug ID: 106153
           Summary: KWin crashed when Alt+Tab-ing through open windows
           Product: Mesa
           Version: 17.3
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: bernhardu at mailbox.org
        QA Contact: dri-devel at lists.freedesktop.org

Created attachment 138954
  --> https://bugs.freedesktop.org/attachment.cgi?id=138954&action=edit
More infos of KCrash/gdb and glxinfo.

This might be a duplicate of #102423 or #103234.
(But did not want to pollute these if they were unrelated.)

...
#4  0x00007f78f8a4c793 in KCrash::defaultCrashHandler (sig=11) at ./src/kcra...
#5  <signal handler called>                                                 ...
#6  si_emit_draw_packets (sctx=sctx at entry=0x5600dec29f30, info=info at entry=0x...
#7  0x00007f78c278d2b0 in si_draw_vbo (ctx=0x5600dec29f30, info=0x5600dec6b1...
#8  0x00007f78c24efd03 in tc_call_draw_vbo (pipe=<optimized out>, payload=0x...
#9  0x00007f78c24eddff in tc_batch_execute (thread_index=0, job=0x5600dec6a8...
...
(gdb) up
#6  si_emit_draw_packets (sctx=sctx at entry=0x5600dec29f30, info=info at entry=0x...
713                     index_max_size = (indexbuf->width0 - index_offset) /

At this point it looks like variable indexbuf is NULL.

"bt full" would suggest this too:
#7  0x00007f78c278d2b0 in si_draw_vbo (ctx=0x5600dec29f30, info=0x5600dec6b1...
...
        indexbuf = 0x0

So I cannot reproduce this and was hit just once.
But it could be related to the not so long Qt 5.10 update in Debian testing.
I took a core dump if there are more questions.
All debug symbols are available as far as I see.

Related could also be that the core file is of a size of 3.5 GB so that
might have led to the NULL pointer.
Attached is a file containing the more infos of KCrash/gdb and glxinfo.

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