[Bugme-new] [Bug 18252] New: spinlock lockup in __make_request <- submit_bio <- ondemand_readahead

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=18252

           Summary: spinlock lockup in __make_request <- submit_bio <-
                    ondemand_readahead
           Product: IO/Storage
           Version: 2.5
    Kernel Version: 2.6.36-rc3
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Block Layer
        AssignedTo: axboe at kernel.dk
        ReportedBy: stefanr at s5r6.in-berlin.de
        Regression: No


Created an attachment (id=29562)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=29562)
BUG screenshot

After a week uptime of 2.6.36-rc3 (I ran 2.6.35 before that), I was greeted by
a black screen of death today in the morning:

(see screenshot in attachment; partial transcript:)

sending NMI to all CPUs:
BUG: soinlock lockup on CPU#0, ktorrent/4313, ffff8802...
PID: 4313, comm: ktorrent Tainted: G  M D W   2.6.36-rc3 #3
Call Trace:
 [...] do_raw_spin_lock+0x118/0x147
 [...] _raw_spin_lock_irq+0x44/0x49
 [...] ? __make_request+0x5c/0x400
 [...] __make_request+0x5c/0x400
 [...] generic_make_request+0x23a/0x2a9
 [...] submit_bio+0xad/b6
 [...] mpage_bio_submit...
 [...] do_mpage_readpage...
 [...] ? get_parent_ip...
 [...] ? sub_preempt_count...
 [...] ? __lru_cache_add...
 [...] mpage_readpages...
 [...] ? ext4_get_block...
 [...] ? __alloc_pages_nodemask...
 [...] ? ext4_get_block...
 [...] ext4_readpages...
 [...] __do_page_cache_readahead...
 [...] ? __do_page_cache_readahead...
 [...] ra_submit...
 [...] ondemand_readahead...

This is a system with Phenom II x4 and Radeon graphics.  Since kernel mode
setting is fairly new for radeon, it is possible that the lockup happened with
earlier kernels too but simply ended in a lockup without trace dump to the
screen.  IOW, it is not clear to me whether this is a regression or not.

The bug happened while kaffeine wrote an MPEG 2 TS to the same filesystem from
which ktorrent was reading.  Of course this kind of commonplace workload
happened without problem two or three times before during the week in which I
ran 2.6.36-rc3.

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