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    SubjectRe: Oops: 2.5.64 check_obj_poison for 'size-64'
    Zwane Mwaikambo <zwane@linuxpower.ca> wrote:
    >
    > On Thu, 6 Mar 2003, Andrew Morton wrote:
    >
    > > Zwane Mwaikambo <zwane@linuxpower.ca> wrote:
    > > >
    > > > This just popped up on my screen, seems to have been triggered by sar/cron
    > > > (i'll probably have to reboot the box soon)
    > > >
    > > > slab error in check_poison_obj(): cache `size-64': object was modified after freeing
    > > > Call Trace:
    > > > [<c0142226>] check_poison_obj+0x66/0x70
    > > > [<c0143b92>] kmalloc+0xd2/0x180
    > > > [<c0166078>] pipe_new+0x28/0xd0
    > > > [<c0166153>] get_pipe_inode+0x23/0xb0
    > > > [<c0166212>] do_pipe+0x32/0x1e0
    > > > [<c0111ed3>] sys_pipe+0x13/0x60
    > > > [<c010ad9b>] syscall_call+0x7/0xb
    > >
    > > Don't know. If you're using anticipatory scheduler in 2.5.63-mmfoo this
    > > will happen. 64-mm1 is OK.
    >
    > Nope simply 2.5.64-unwashed. I don't know how to twiddle the advanced
    > knobs

    OK. -mm has a more sophisticated use-after-free detector. It might be
    worth dropping that in there, see if we can get more info.

    ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.5/2.5.64/2.5.64-mm1/broken-out/use-after-free-check.patch

    > > show_interrupts() is walking the per-irq action chain without locking it.
    > > Any concurrent add/remove activity will explode.
    > >
    > > Do you want to hunt down all the show_interrupts() instances and pop a
    > > spin_lock_irq(desc->lock) around them?
    >
    > Sure thing.

    OK, thanks.

    All the arch/*/kernel/irq.c implementations are distressingly similar.
    Andrey Panin did a bunch of work a while back to start consolidating the
    common code but it didn't quite get finished off. Guess we just have to grit
    our teeth for now.
    -
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