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SubjectRe: 3.4.0-02580-g72c04af regression on sparc64 - partitions not recognized
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From: Meelis Roos <mroos@linux.ee>
Date: Wed, 23 May 2012 19:46:46 +0300 (EEST)

CC:'ing interested parties.

>> > Just tested 3.4.0-02580-g72c04af on about 10 machines. While most of
>> > them work (including 3 different sparc64 machines with real scsi disks),
>> > Sun Netra X1 with pata_ali and IDE disk consistently fails to boot. sda
>> > is recognized but no partitions. 3.3.0 works fine, as did something
>> > around 3.4-rc7 (plain 3.4 not tested yet). No other IDE machines tested
>> > yet since I have none with remote console at the moment.
>>
>> If 3.4.0-final is OK, start bisecting from v3.4.0 until 72c04af. One
>> possibility could be the sparc64 NOBOOTMEM conversion that went into
>> the merge window.
>
> Bisecting leads to this commit:
>
> a7a20d103994fd760766e6c9d494daa569cbfe06 is the first bad commit
> commit a7a20d103994fd760766e6c9d494daa569cbfe06
> Author: Dan Williams <dan.j.williams@intel.com>
> Date: Thu Mar 22 17:05:11 2012 -0700
>
> [SCSI] sd: limit the scope of the async probe domain
>
> sd injects and synchronizes probe work on the global kernel-wide domain.
> This runs into conflict with PM that wants to perform resume actions in
> async context:
>
> [ 494.237079] INFO: task kworker/u:3:554 blocked for more than 120 seconds.
> [ 494.294396] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> [ 494.360809] kworker/u:3 D 0000000000000000 0 554 2 0x00000000
> [ 494.420739] ffff88012e4d3af0 0000000000000046 ffff88013200c160 ffff88012e4d3fd8
> [ 494.484392] ffff88012e4d3fd8 0000000000012500 ffff8801394ea0b0 ffff88013200c160
> [ 494.548038] ffff88012e4d3ae0 00000000000001e3 ffffffff81a249e0 ffff8801321c5398
> [ 494.611685] Call Trace:
> [ 494.632649] [<ffffffff8149dd25>] schedule+0x5a/0x5c
> [ 494.674687] [<ffffffff8104b968>] async_synchronize_cookie_domain+0xb6/0x112
> [ 494.734177] [<ffffffff810461ff>] ? __init_waitqueue_head+0x50/0x50
> [ 494.787134] [<ffffffff8131a224>] ? scsi_remove_target+0x48/0x48
> [ 494.837900] [<ffffffff8104b9d9>] async_synchronize_cookie+0x15/0x17
> [ 494.891567] [<ffffffff8104ba49>] async_synchronize_full+0x54/0x70 <-- here we wait for async contexts to complete
> [ 494.943783] [<ffffffff8104b9f5>] ? async_synchronize_full_domain+0x1a/0x1a
> [ 495.002547] [<ffffffffa00114b1>] sd_remove+0x2c/0xa2 [sd_mod]
> [ 495.051861] [<ffffffff812fe94f>] __device_release_driver+0x86/0xcf
> [ 495.104807] [<ffffffff812fe9bd>] device_release_driver+0x25/0x32 <-- here we take device_lock()
>
> [ 853.511341] INFO: task kworker/u:4:549 blocked for more than 120 seconds.
> [ 853.568693] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> [ 853.635119] kworker/u:4 D ffff88013097b5d0 0 549 2 0x00000000
> [ 853.695129] ffff880132773c40 0000000000000046 ffff880130790000 ffff880132773fd8
> [ 853.758990] ffff880132773fd8 0000000000012500 ffff88013288a0b0 ffff880130790000
> [ 853.822796] 0000000000000246 0000000000000040 ffff88013097b5c8 ffff880130790000
> [ 853.886633] Call Trace:
> [ 853.907631] [<ffffffff8149dd25>] schedule+0x5a/0x5c
> [ 853.949670] [<ffffffff8149cc44>] __mutex_lock_common+0x220/0x351
> [ 854.001225] [<ffffffff81304bd7>] ? device_resume+0x58/0x1c4
> [ 854.049082] [<ffffffff81304bd7>] ? device_resume+0x58/0x1c4
> [ 854.097011] [<ffffffff8149ce48>] mutex_lock_nested+0x2f/0x36 <-- here we wait for device_lock()
> [ 854.145591] [<ffffffff81304bd7>] device_resume+0x58/0x1c4
> [ 854.192066] [<ffffffff81304d61>] async_resume+0x1e/0x45
> [ 854.237019] [<ffffffff8104bc93>] async_run_entry_fn+0xc6/0x173 <-- ...while running in async context
>
> Provide a 'scsi_sd_probe_domain' so that async probe actions actions can
> be flushed without regard for the state of PM, and allow for the resume
> path to handle devices that have transitioned from SDEV_QUIESCE to
> SDEV_DEL prior to resume.
>
> Acked-by: Alan Stern <stern@rowland.harvard.edu>
> [alan: uplevel scsi_sd_probe_domain, clarify scsi_device_resume]
> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
> [jejb: remove unneeded config guards in include file]
> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
>
> :040000 040000 4e59ccb852f261f97701a245e637a690dfce9d20 fc73ca0da1288a7f30b81a8593ddad2146d7bfb5 M drivers
>
> --
> Meelis Roos (mroos@linux.ee)


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