Hi,

On Friday 22 August 2008, Rafael J. Wysocki wrote:
quoted text
> On Friday, 22 of August 2008, Vegard Nossum wrote:
> > On Fri, Aug 22, 2008 at 12:16 AM, Rafael J. Wysocki <rjw@sisk.pl> wrote:
> > > On Thursday, 21 of August 2008, Pekka Enberg wrote:
> > >> > =============================================================================
> > >> > BUG blkdev_ioc: Invalid object pointer 0xf5cdaca8
> > >> > -----------------------------------------------------------------------------
> > >>
> > >> Ok, here we have the block layer passing a bad pointer to SLUB this
> > >> time. And it's also from the suspend code (although it's the resume
> > >> path this time). As we never see an oops from the block layer first,
> > >> it's possible that someone else corrupted everything and it just shows
> > >> up in the block layer. Maybe something worth investigating, though.
> > >>
> > >> > INFO: Slab 0xf789e318 objects=14 used=14 fp=0x00000000 flags=0x2082083
> > >> > Pid: 3597, comm: bash Tainted: G      D   2.6.27-rc4-00003-ga798564-dirty #30
> > >> >  [<c01b2576>] slab_err+0x46/0x50
> > >> >  [<c01b2766>] ? check_slab+0xd6/0xf0
> > >> >  [<c0181aef>] ? call_rcu+0x6f/0x80
> > >> >  [<c015e91b>] ? trace_hardirqs_on+0xb/0x10
> > >> >  [<c01b3c78>] __slab_free+0x238/0x360
> > >> >  [<c01b4749>] kmem_cache_free+0xa9/0x120
> > >> >  [<c036b773>] ? put_io_context+0x53/0x70
> > >> >  [<c036b773>] ? put_io_context+0x53/0x70
> > >> >  [<c036b773>] put_io_context+0x53/0x70
> > >> >  [<c036b82e>] exit_io_context+0x6e/0x80
> > >> >  [<c013de6e>] do_exit+0x84e/0x890
> > >> >  [<c037b794>] ? trace_hardirqs_on_thunk+0xc/0x10
> > >> >  [<c013b55b>] ? printk+0x1b/0x20
> > >> >  [<c013a50a>] ? print_oops_end_marker+0x2a/0x30
> > >> >  [<c01060f1>] oops_end+0xb1/0xc0
> > >> >  [<c01067c0>] die+0x50/0x70
> > >> >  [<c0106871>] do_trap+0x91/0xc0
> > >> >  [<c0106940>] ? do_invalid_op+0x0/0xa0
> > >> >  [<c01069c8>] do_invalid_op+0x88/0xa0
> > >> >  [<c01a0f39>] ? page_remove_rmap+0x109/0x120
> > >> >  [<c013b2d1>] ? vprintk+0x151/0x3c0
> > >> >  [<c013b45b>] ? vprintk+0x2db/0x3c0
> > >> >  [<c015c5ea>] ? print_lock_contention_bug+0x1a/0xe0
> > >> >  [<c015c5ea>] ? print_lock_contention_bug+0x1a/0xe0
> > >> >  [<c0687d3a>] error_code+0x72/0x78
> > >> >  [<c013007b>] ? sched_rt_period_timer+0x21b/0x270
> > >> >  [<c01a0f39>] ? page_remove_rmap+0x109/0x120
> > >> >  [<c0198721>] unmap_vmas+0x4b1/0x8b0
> > >> >  [<c015c5ea>] ? print_lock_contention_bug+0x1a/0xe0
> > >> >  [<c019d504>] exit_mmap+0x84/0x120
> > >> >  [<c0138538>] mmput+0x48/0xa0
> > >> >  [<c013c3d7>] exit_mm+0xe7/0x110
> > >> >  [<c013d7a4>] do_exit+0x184/0x890
> > >> >  [<c013b55b>] ? printk+0x1b/0x20
> > >> >  [<c013a50a>] ? print_oops_end_marker+0x2a/0x30
> > >> >  [<c01060f1>] oops_end+0xb1/0xc0
> > >> >  [<c01067c0>] die+0x50/0x70
> > >> >  [<c0122b4f>] do_page_fault+0x1ef/0xa20
> > >> >  [<c010b335>] ? native_sched_clock+0xb5/0x110
> > >> >  [<c01600ea>] ? __lock_acquire+0x27a/0xa00
> > >> >  [<c0122960>] ? do_page_fault+0x0/0xa20
> > >> >  [<c0687d3a>] error_code+0x72/0x78
> > >> >  [<c038ad65>] ? __list_add+0x15/0x90
> > >> >  [<c0687133>] ? _spin_lock+0x63/0x70
> > >> >  [<c018b954>] rmqueue_bulk+0x54/0x80
> > >> >  [<c018d317>] get_page_from_freelist+0x5a7/0x720
> > >> >  [<c01600ea>] ? __lock_acquire+0x27a/0xa00
> > >> >  [<c018dd50>] __alloc_pages_internal+0xa0/0x450
> > >> >  [<c01acd4b>] alloc_pages_current+0x7b/0xc0
> > >> >  [<c01b37fb>] new_slab+0x1bb/0x2d0
> > >> >  [<c0687877>] ? _spin_unlock+0x27/0x50
> > >> >  [<c01b40ca>] __slab_alloc+0x32a/0x4e0
> > >> >  [<c010b335>] ? native_sched_clock+0xb5/0x110
> > >> >  [<c01b4424>] kmem_cache_alloc+0xb4/0xe0
> > >> >  [<c018969e>] ? mempool_alloc_slab+0xe/0x10
> > >> >  [<c018969e>] ? mempool_alloc_slab+0xe/0x10
> > >> >  [<c018969e>] mempool_alloc_slab+0xe/0x10
> > >> >  [<c01897a1>] mempool_alloc+0x31/0xf0
> > >> >  [<c015e884>] ? trace_hardirqs_on_caller+0xd4/0x160
> > >> >  [<c015e91b>] ? trace_hardirqs_on+0xb/0x10
> > >> >  [<c0368c7e>] get_request+0xae/0x2c0
> > >> >  [<c036935c>] get_request_wait+0x1c/0xd0
> > >> >  [<c0687462>] ? _spin_lock_irq+0x72/0x80
> > >> >  [<c0369442>] blk_get_request+0x32/0x70
> > >> >  [<c0471c1c>] generic_ide_resume+0x5c/0xf0
> > >
> > > IDE again?

"again"?

generic_ide_resume() just tries to get new request from the block
layer which seems to end up being problematic.

quoted text
> > >
> > > Vegard, this is piix, isn't it?
> > 
> > If this makes it so, then yes:
> > 
> > calling  piix_ide_init+0x0/0xb0
> > initcall piix_ide_init+0x0/0xb0 returned 0 after 0 msecs
> > calling  ide_scan_pcibus+0x0/0xf0
> > piix 0000:00:1f.1: IDE controller (0x8086:0x27df rev 0x01)
> > piix 0000:00:1f.1: IDE port disabled
> > piix 0000:00:1f.1: not 100% native mode: will probe irqs later
> >     ide0: BM-DMA at 0xffa0-0xffa7
> > Probing IDE interface ide0...
> > hda: WDC WD1600BB-00DAA3, ATA DISK drive
> > hda: host max PIO4 wanted PIO255(auto-tune) selected PIO4
> > hda: UDMA/100 mode selected
> > ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
> > 
> > It is also interesting that you mention that; this is from an earlier
> > run (before serial console was working properly):
> > 
> > > In my last run, I managed to get a lot of ascii art on the screen, but
> > > also one line which gave me the EIP of the oops:
> > 
> > > $ addr2line -e vmlinux -i c03724f3
> > > block/cfq-iosched.c:1190
> > 
> > > /*
> > >  * Must always be called with the rcu_read_lock() held
> > >  */
> > > static void
> > > __call_for_each_cic(struct io_context *ioc,
> > >                    void (*func)(struct io_context *, struct cfq_io_context *))
> > > {
> > >        struct cfq_io_context *cic;
> > >        struct hlist_node *n;
> > >
> > >        hlist_for_each_entry_rcu(cic, n, &ioc->cic_list, cic_list) <-- here
> > >                func(ioc, cic);
> > > }
> 
> Hmm.
> 
> Would that be possible to switch temporarily to PATA/libata and see if the
> problem goes away?  Then, we'd get a strong indication that it really is
> related to IDE.

IIRC besides conversion to blk_{get,put}_request() conversion from
15th July (commit 5b114715ed63f3a4fdf790f5df61364fc4adadf1) there
weren't any PM related IDE changes recently.

Vegard, it would be worth to try if the kernels at the above commit
and at commit 9a2d43b7566caeeeb414aa628bc2759028897dbb (one commit
before the above one) are OK.

If it doesn't give the definitive answer then doing git-bisect run
would be of great help in identifying and fixing the source of the
problem quickly.

Thanks,
Bart
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