On Mon, 5 Jun 2006 16:05:54 -0400 Dave Jones wrote:
> On Mon, Jun 05, 2006 at 01:00:39PM -0700, Randy.Dunlap wrote:
> > On Mon, 5 Jun 2006 21:44:22 +0200 Ingo Molnar wrote:
> >
> > >
> > > * Martin Bligh <[email protected]> wrote:
> > >
> > > > panic on NUMA-Q during LTP. Was fine in -mm2.
> > > >
> > > > BUG: unable to handle kernel paging request at virtual address 22222232
> > >
> > > > EIP is at check_deadlock+0x19/0xe1
> > > > eax: 00000001 ebx: e4453030 ecx: 00000000 edx: e4008000
> > > > esi: 22222222 edi: 00000001 ebp: 22222222 esp: e47ebec0
> > >
> > > again these 0x22222222 entries on the stack. What on earth does this?
> > > Andy got a similar crash on x86_64, with a 0x2222222222222222 entry ...
> > >
> > > nothing of our magic values are 0x22 or 0x222222222.
> >
> > kernel/mutex-debug.c:
> > void debug_mutex_free_waiter(struct mutex_waiter *waiter)
> > {
> > DEBUG_WARN_ON(!list_empty(&waiter->list));
> > memset(waiter, 0x22, sizeof(*waiter));
> > }
>
> Documentation/magic-number.txt sounds so promising, but we scatter definitions
> of numbers all over the place. (No mention of the slab poison values,
> or similar numbers there for eg, and various pointers to _other_ lists
> of magic numbers).
I have a few more that I can add to include/linux/poison.h, like this one
above (only in -mm at present).
./include/linux/libata.h:#define ATA_TAG_POISON 0xfafbfcfdU
./arch/ppc/8260_io/fcc_enet.c:1918: memset((char *)(&(immap->im_dprambase[(mem_addr+64)])), 0x88, 32);
./drivers/usb/mon/mon_text.c:429: memset(mem, 0xe5, sizeof(struct mon_event_text));
./kernel/mutex-debug.c:384: memset(waiter, 0x11, sizeof(*waiter));
./kernel/mutex-debug.c:400: memset(waiter, 0x22, sizeof(*waiter));
./security/keys/key.c:985: memset(&key->payload, 0xbd, sizeof(key->payload));
./drivers/char/ftape/lowlevel/ftape-ctl.c:738: memset(ft_buffer[i]->address, 0xAA, FT_BUFF_SIZE);
./drivers/block/sx8.c:/* 0xf is just arbitrary, non-zero noise; this is sorta like poisoning */
---
~Randy
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