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    SubjectRegression in 2.6.25-rc3: s2ram segfaults before suspending
    Hi all,

    I have a Thinkpad T61p, which I'm able to suspend with s2ram on
    Linux 2.6.24.3. However when I try to suspend it on 2.6.25-rc3, s2ram
    dies after changing to vt1, with a segfault. I'm using s2ram from cvs,
    and libx86 version 0.99 from http://www.codon.org.uk/~mjg59/libx86/.

    Some details about the segfault:

    $ sudo gdb ./s2ram
    (gdb) run
    Starting program: /home/ksm/downloads/suspend/s2ram
    Switching from vt7 to vt1
    Calling get_mode

    Program received signal SIGSEGV, Segmentation fault.
    0xb7facf4a in run_vm86 () at lrmi.c:526
    526 asm volatile (
    (gdb) list
    521 static int
    522 lrmi_vm86(struct vm86_struct *vm)
    523 {
    524 int r;
    525 #ifdef __PIC__
    526 asm volatile (
    527 "pushl %%ebx\n\t"
    528 "movl %2, %%ebx\n\t"
    529 "int $0x80\n\t"
    530 "popl %%ebx"
    (gdb) bt
    #0 0xb7facf4a in run_vm86 () at lrmi.c:526
    #1 0xb7fad61b in LRMI_int (i=16, r=0xbffca670) at lrmi.c:844
    #2 0x0804acfc in do_vbe_service (AX=20227, BX=0, regs=0xbffca670)
    at vbetool/vbetool.c:158
    #3 0x0804af7e in __get_mode () at vbetool/vbetool.c:453
    #4 0x0804a30f in s2ram_hacks () at s2ram-x86.c:268
    #5 0x0804954f in main (argc=1, argv=0x0) at s2ram-main.c:92

    I have tried to bisect the problem, and it fingered the following
    commit:

    commit 82bc03fc158e28c90d7ed9919410776039cb4e14
    Author: Ingo Molnar <mingo@elte.hu>

    x86: add PWT to NOCACHE flags

    Reverting this commit in the bisected tree (by executing git show
    82bc03fc158e28c90d7ed9919410776039cb4e14 | patch -R -p1), makes the
    segfault go away. I've run make clean between each kernel compile, to be
    sure the tree was correctly compiled.

    I have attached the .config I'm using for 2.6.25-rc3 (when bisecting, I
    just choose the default on every question). If necessary, I can try to
    reconstruct the one I ended up with after the bisection.

    Hope this makes sense to someone, and thanks in advance.

    --
    Kind regards
    Klaus S. Madsen


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