next-20140428 (regression: DEADLOCK)

next-20140428 (regression: DEADLOCK)

[Nishanth Menon]

omap2plus_defconfig shows for the following platform deadlock with
console_lock.

 1: am335x-evm:  Boot PASS: http://slexy.org/raw/s2biDSRTAP
 2:  am335x-sk:  Boot PASS: http://slexy.org/raw/s20deZjf34
 3: am3517-evm:  Boot PASS: http://slexy.org/raw/s21NM1bLxs
 4:  am37x-evm:  Boot PASS: http://slexy.org/raw/s2022AFyZ6
 5: am43xx-epos:  Boot PASS: http://slexy.org/raw/s21Dq284CM
 6: BeagleBoard-XM:  Boot PASS: http://slexy.org/raw/s2aK24U5ON
 7: beagleboard-vanilla:  Boot PASS: http://slexy.org/raw/s21j15I8kK
 8: beaglebone-black:  Boot PASS: http://slexy.org/raw/s21jO02jIK
 9: craneboard:  Boot PASS: http://slexy.org/raw/s22JGqMSfY
10: DRA7xx-EVM:  Boot PASS: http://slexy.org/raw/s260y1Opd1
11:       n900:  Boot PASS: http://slexy.org/raw/s20IDKmJ6L
12: pandaboard-vanilla:  Boot PASS: http://slexy.org/raw/s2dJcyep9A
13:    sdp2430:  Boot PASS: http://slexy.org/raw/s20Oldnm8I
14:    sdp3430:  Boot PASS: http://slexy.org/raw/s2Mo7s3ttZ
15: OMAP5432uEVM:  Boot PASS: http://slexy.org/raw/s2qXj7HFTJ


 =============================================
 [ INFO: possible recursive locking detected ]
 3.15.0-rc2-next-20140428-00002-gd0ca5e6 #1 Not tainted
 ---------------------------------------------
 swapper/0/0 is trying to acquire lock:
  (console_lock){+.+...}, at: [<c07d1124>] con_init+0xc/0x28c

 but task is already holding lock:
  (console_lock){+.+...}, at: [<c008c224>] vprintk_emit+0x200/0x590

 other info that might help us debug this:
  Possible unsafe locking scenario:

        CPU0
        ----
   lock(console_lock);
   lock(console_lock);

  *** DEADLOCK ***

  May be due to missing lock nesting notation

 1 lock held by swapper/0/0:
  #0:  (console_lock){+.+...}, at: [<c008c224>] vprintk_emit+0x200/0x590


-- 
Regards,
Nishanth Menon

Re: next-20140428 (regression: DEADLOCK)

[Felipe Balbi]

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On Mon, Apr 28, 2014 at 07:51:03AM -0500, Nishanth Menon wrote:
> omap2plus_defconfig shows for the following platform deadlock with
> console_lock.
> 
>  1: am335x-evm:  Boot PASS: http://slexy.org/raw/s2biDSRTAP
>  2:  am335x-sk:  Boot PASS: http://slexy.org/raw/s20deZjf34
>  3: am3517-evm:  Boot PASS: http://slexy.org/raw/s21NM1bLxs
>  4:  am37x-evm:  Boot PASS: http://slexy.org/raw/s2022AFyZ6
>  5: am43xx-epos:  Boot PASS: http://slexy.org/raw/s21Dq284CM
>  6: BeagleBoard-XM:  Boot PASS: http://slexy.org/raw/s2aK24U5ON
>  7: beagleboard-vanilla:  Boot PASS: http://slexy.org/raw/s21j15I8kK
>  8: beaglebone-black:  Boot PASS: http://slexy.org/raw/s21jO02jIK
>  9: craneboard:  Boot PASS: http://slexy.org/raw/s22JGqMSfY
> 10: DRA7xx-EVM:  Boot PASS: http://slexy.org/raw/s260y1Opd1
> 11:       n900:  Boot PASS: http://slexy.org/raw/s20IDKmJ6L
> 12: pandaboard-vanilla:  Boot PASS: http://slexy.org/raw/s2dJcyep9A
> 13:    sdp2430:  Boot PASS: http://slexy.org/raw/s20Oldnm8I
> 14:    sdp3430:  Boot PASS: http://slexy.org/raw/s2Mo7s3ttZ
> 15: OMAP5432uEVM:  Boot PASS: http://slexy.org/raw/s2qXj7HFTJ
> 
> 
>  =============================================
>  [ INFO: possible recursive locking detected ]
>  3.15.0-rc2-next-20140428-00002-gd0ca5e6 #1 Not tainted
>  ---------------------------------------------
>  swapper/0/0 is trying to acquire lock:
>   (console_lock){+.+...}, at: [<c07d1124>] con_init+0xc/0x28c
> 
>  but task is already holding lock:
>   (console_lock){+.+...}, at: [<c008c224>] vprintk_emit+0x200/0x590
> 
>  other info that might help us debug this:
>   Possible unsafe locking scenario:
> 
>         CPU0
>         ----
>    lock(console_lock);
>    lock(console_lock);
> 
>   *** DEADLOCK ***
> 
>   May be due to missing lock nesting notation
> 
>  1 lock held by swapper/0/0:
>   #0:  (console_lock){+.+...}, at: [<c008c224>] vprintk_emit+0x200/0x590

someone already found the culprit:

http://marc.info/?l=linux-kernel&m=139870299331959

cheers

-- 
balbi

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