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    SubjectRe: 2.6.35-rc2-git2: Reported regressions from 2.6.34
    On 2010-06-11 10:32, Ingo Molnar wrote:
    >
    > * Jens Axboe <jaxboe@fusionio.com> wrote:
    >
    >> On 2010-06-09 03:53, Linus Torvalds wrote:
    >>>> Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=16129
    >>>> Subject : BUG: using smp_processor_id() in preemptible [00000000] code: jbd2/sda2
    >>>> Submitter : Jan Kreuzer <kontrollator@gmx.de>
    >>>> Date : 2010-06-05 06:15 (4 days old)
    >>>
    >>> This seems to have been introduced by
    >>>
    >>> commit 7cbaef9c83e58bbd4bdd534b09052b6c5ec457d5
    >>> Author: Ingo Molnar <mingo@elte.hu>
    >>> Date: Sat Nov 8 17:05:38 2008 +0100
    >>>
    >>> sched: optimize sched_clock() a bit
    >>>
    >>> sched_clock() uses cycles_2_ns() needlessly - which is an irq-disabling
    >>> variant of __cycles_2_ns().
    >>>
    >>> Most of the time sched_clock() is called with irqs disabled already.
    >>> The few places that call it with irqs enabled need to be updated.
    >>>
    >>> Signed-off-by: Ingo Molnar <mingo@elte.hu>
    >>>
    >>> and this seems to be one of those calling cases that need to be updated..
    >>>
    >>> Ingo? The call trace is:
    >>>
    >>> BUG: using smp_processor_id() in preemptible [00000000] code: jbd2/sda2-8/337
    >>> caller is native_sched_clock+0x3c/0x68
    >>> Pid: 337, comm: jbd2/sda2-8 Not tainted 2.6.35-rc1jan+ #4
    >>> Call Trace:
    >>> [<ffffffff812362c5>] debug_smp_processor_id+0xc9/0xe4
    >>> [<ffffffff8101059d>] native_sched_clock+0x3c/0x68
    >>> [<ffffffff8101043d>] sched_clock+0x9/0xd
    >>> [<ffffffff81212d7a>] blk_rq_init+0x97/0xa3
    >>> [<ffffffff81214d71>] get_request+0x1c4/0x2d0
    >>> [<ffffffff81214ea6>] get_request_wait+0x29/0x1a6
    >>> [<ffffffff81215537>] __make_request+0x338/0x45b
    >>> [<ffffffff812147c2>] generic_make_request+0x2bb/0x330
    >>> [<ffffffff81214909>] submit_bio+0xd2/0xef
    >>> [<ffffffff811413cb>] submit_bh+0xf4/0x116
    >>> [<ffffffff81144853>] block_write_full_page_endio+0x89/0x96
    >>> [<ffffffff81144875>] block_write_full_page+0x15/0x17
    >>> [<ffffffff8119b00a>] ext4_writepage+0x356/0x36b
    >>> [<ffffffff810e1f91>] __writepage+0x1a/0x39
    >>> [<ffffffff810e32a6>] write_cache_pages+0x20d/0x346
    >>> [<ffffffff810e3406>] generic_writepages+0x27/0x29
    >>> [<ffffffff811ca279>] journal_submit_data_buffers+0x110/0x17d
    >>> [<ffffffff811ca986>] jbd2_journal_commit_transaction+0x4cb/0x156d
    >>> [<ffffffff811d0cba>] kjournald2+0x147/0x37a
    >>>
    >>> (from the bugzilla thing)
    >>
    >> This should be fixed by commit 28f4197e which was merged on friday.
    >
    > Hm, it's still not entirely fixed, as of 2.6.35-rc2-00131-g7908a9e. With some
    > configs i get bad spinlock warnings during bootup:
    >
    > [ 28.968013] initcall net_olddevs_init+0x0/0x82 returned 0 after 93750 usecs
    > [ 28.972003] calling b44_init+0x0/0x55 @ 1
    > [ 28.976009] bus: 'pci': add driver b44
    > [ 28.976374] sda:
    > [ 28.978157] BUG: spinlock bad magic on CPU#1, async/0/117
    > [ 28.980000] lock: 7e1c5bbc, .magic: 00000000, .owner: <none>/-1, .owner_cpu: 0
    > [ 28.980000] Pid: 117, comm: async/0 Not tainted 2.6.35-rc2-tip-01092-g010e7ef-dirty #8183
    > [ 28.980000] Call Trace:
    > [ 28.980000] [<41ba6d55>] ? printk+0x20/0x24
    > [ 28.980000] [<4134b7b7>] spin_bug+0x7c/0x87
    > [ 28.980000] [<4134b853>] do_raw_spin_lock+0x1e/0x123
    > [ 28.980000] [<41ba92ca>] ? _raw_spin_lock_irqsave+0x12/0x20
    > [ 28.980000] [<41ba92d2>] _raw_spin_lock_irqsave+0x1a/0x20
    > [ 28.980000] [<4133476f>] blkiocg_update_io_add_stats+0x25/0xfb
    > [ 28.980000] [<41335dae>] ? cfq_prio_tree_add+0xb1/0xc1
    > [ 28.980000] [<41337bc7>] cfq_insert_request+0x8c/0x425
    > [ 28.980000] [<41ba9271>] ? _raw_spin_unlock_irqrestore+0x17/0x23
    > [ 28.980000] [<41ba9271>] ? _raw_spin_unlock_irqrestore+0x17/0x23
    > [ 28.980000] [<41329225>] elv_insert+0x107/0x1a0
    > [ 28.980000] [<41329354>] __elv_add_request+0x96/0x9d
    > [ 28.980000] [<4132bb8c>] ? drive_stat_acct+0x9d/0xc6
    > [ 28.980000] [<4132dd64>] __make_request+0x335/0x376
    > [ 28.980000] [<4132c726>] generic_make_request+0x336/0x39d
    > [ 28.980000] [<410ad422>] ? kmem_cache_alloc+0xa1/0x105
    > [ 28.980000] [<41089285>] ? mempool_alloc_slab+0xe/0x10
    > [ 28.980000] [<41089285>] ? mempool_alloc_slab+0xe/0x10
    > [ 28.980000] [<41089285>] ? mempool_alloc_slab+0xe/0x10
    > [ 28.980000] [<41089347>] ? mempool_alloc+0x57/0xe2
    > [ 28.980000] [<4132c804>] submit_bio+0x77/0x8f
    > [ 28.980000] [<410d2cbc>] ? bio_alloc_bioset+0x37/0x94
    > [ 28.980000] [<410ceb90>] submit_bh+0xc3/0xe2
    > [ 28.980000] [<410d1474>] block_read_full_page+0x249/0x259
    > [ 28.980000] [<410d31fb>] ? blkdev_get_block+0x0/0xc6
    > [ 28.980000] [<41087bfa>] ? add_to_page_cache_locked+0x94/0xb5
    > [ 28.980000] [<410d3d92>] blkdev_readpage+0xf/0x11
    > [ 28.980000] [<41088823>] do_read_cache_page+0x7d/0x11a
    > [ 28.980000] [<410d3d83>] ? blkdev_readpage+0x0/0x11
    > [ 28.980000] [<410888f4>] read_cache_page_async+0x16/0x1b
    > [ 28.980000] [<41088904>] read_cache_page+0xb/0x12
    > [ 28.980000] [<410e80e1>] read_dev_sector+0x2a/0x63
    > [ 28.980000] [<410e92e8>] adfspart_check_ICS+0x2e/0x166
    > [ 28.980000] [<41ba6d55>] ? printk+0x20/0x24
    > [ 28.980000] [<410e8d23>] rescan_partitions+0x196/0x3e4
    > [ 28.980000] [<41ba7dc7>] ? __mutex_unlock_slowpath+0x98/0x9f
    > [ 28.980000] [<410e92ba>] ? adfspart_check_ICS+0x0/0x166
    > [ 28.980000] [<410d4277>] __blkdev_get+0x1e7/0x292
    > [ 28.980000] [<4133a201>] ? kobject_put+0x14/0x16
    > [ 28.980000] [<410d432c>] blkdev_get+0xa/0xc
    > [ 28.980000] [<410e81fb>] register_disk+0x94/0xe5
    > [ 28.980000] [<413326c6>] ? blk_register_region+0x1b/0x20
    > [ 28.980000] [<41332815>] add_disk+0x57/0x95
    > [ 28.980000] [<41331fc6>] ? exact_match+0x0/0x8
    > [ 28.980000] [<4133233f>] ? exact_lock+0x0/0x11
    > [ 28.980000] [<41643848>] sd_probe_async+0x108/0x1be
    > [ 28.980000] [<41048865>] async_thread+0xf5/0x1e6
    > [ 28.980000] [<4102cbcb>] ? default_wake_function+0x0/0xd
    > [ 28.980000] [<41048770>] ? async_thread+0x0/0x1e6
    > [ 28.980000] [<410433df>] kthread+0x5f/0x64
    > [ 28.980000] [<41043380>] ? kthread+0x0/0x64
    > [ 28.980000] [<41002cc6>] kernel_thread_helper+0x6/0x10
    > [ 29.264071] async/1 used greatest stack depth: 2336 bytes left
    > [ 29.267020] bus: 'ssb': add driver b44
    > [ 29.267072] initcall b44_init+0x0/0x55 returned 0 after 281250 usecs
    > [ 29.267076] calling init_nic+0x0/0x16 @ 1
    >
    > Caused by the same blkiocg_update_io_add_stats() function. Bootlog and config
    > attached. Reproducible on that sha1 and with that config.

    I think I see it, the internal CFQ blkg groups are not properly
    initialized... Will send a patch shortly.

    --
    Jens Axboe



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