[LLVMbugs] [Bug 5128] New: miscompiles led.c:led_create_state from the FreeBSD kernel

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Sat Oct 3 04:50:38 PDT 2009


           Summary: miscompiles led.c:led_create_state from the FreeBSD
           Product: new-bugs
           Version: trunk
          Platform: PC
        OS/Version: FreeBSD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: pawel.worach at gmail.com
                CC: llvmbugs at cs.uiuc.edu, rdivacky at freebsd.org
            Blocks: 3696

Created an attachment (id=3605)
 --> (http://llvm.org/bugs/attachment.cgi?id=3605)

This is a somewhat vague report just to get this bug going, Roman will fill in
the details.

In the led_create_state() function in led.c the call sc->func() fails, it end
up with a page fault panic where it looks like func points to led_list which is
accessed in the LIST_HEAD_INSERT macro.

Now I the code is changed to insert a printf between there like this it works:
        LIST_INSERT_HEAD(&led_list, sc, list);
        sc->func(sc->private, state != 0);

Attached you can find the preprocessed led.c, the original asm output as
led-broken.s and the "fixed" asm output where the printf was inserted.

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