[Bug 67504] intel driver crash in has_offload_slaves

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67504

--- Comment #3 from Danny <moondrake at gmail.com> ---
I did recompile with full debug but unfortunately, I do not manage to crash it
with the same procedure. Everything is a lot slower however, so maybe timing is
important.

I suspected memory corruption as well as triggering the crash seems to rely
there being consideral memory load on the system.

Would valgrind help (you'd need to tell me how to run that with X though)?

Reinstalling the non-debug version again and I can reproduce quite easily
again:

gdb) bt full
#0  has_offload_slaves (sna=0x7f0eb6568000) at sna_accel.c:14700
        screen = <optimized out>
        dirty = <optimized out>
#1  0x00007f0eb78796ee in stop_flush (scanout=0x214a660, sna=0x7f0eb6568000)
    at sna_accel.c:14763
No locals.
#2  sna_accel_flush (sna=0x7f0eb6568000) at sna_accel.c:14985
        priv = 0x214a660
        busy = false
#3  sna_accel_block_handler (sna=0x7f0eb6568000, tv=0x7fff2aed2c58)
    at sna_accel.c:15425
No locals.
#4  0x000000000043d9c4 in BlockHandler (
    pTimeout=pTimeout at entry=0x7fff2aed2c58, 
    pReadmask=pReadmask at entry=0x81c340 <LastSelectMask>) at dixutils.c:387
        i = 0
        j = <optimized out>
#5  0x0000000000469e84 in WaitForSomething (
    pClientsReady=pClientsReady at entry=0x23a7a30) at WaitFor.c:210
        i = <optimized out>
        waittime = {tv_sec = 153, tv_usec = 65000}
        wt = 0x7fff2aed2c60
        timeout = <optimized out>
---Type <return> to continue, or q <return> to quit---
        clientsReadable = {fds_bits = {0 <repeats 16 times>}}
        clientsWritable = {fds_bits = {1, 1, 4294967295, 5415558, 34730504, 
            140733913574944, 34712528, 0, 34712528, 34730504, 0, 206158430224, 
            140733913574960, 140733913574752, 16, 264619602646}}
        selecterr = <optimized out>
        nready = 0
        devicesReadable = {fds_bits = {55, 1, 140733913574912, 48, 43118368, 
            4689382, 48, 43118368, 50831424, 4651885, 1, 48, 0, 0, 0, 
            46284816}}
        now = <optimized out>
        someReady = 0
#6  0x0000000000439581 in Dispatch () at dispatch.c:357
        clientReady = 0x23a7a30
        result = <optimized out>
        client = <optimized out>
        nready = <optimized out>
        icheck = 0x8163f0 <checkForInput>
        start_tick = <optimized out>
#7  0x00000000004282da in main (argc=9, argv=0x7fff2aed3068, 
    envp=<optimized out>) at main.c:298
        i = <optimized out>
        alwaysCheckForInput = {0, 1}

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