system hang

[narasimharo bolisetti <nrbolisetti@yahoo.com>]

 Hi Greg/All, 
    
 This is Narasimharao working for a s/wcompany HCLT.. 
    
 I am working a issue and
 the description is below: 
    
 system stops booting and
 needs a series of console inputs (space bar or return) to
 continue booting. Each input advances the process a little
 bit. 
 Actually I am trying to
 upgrade the s/w from usb pendrive, part of this upgrade
 having multiple times we are disconnecting and connecting
 the usb pen drive. 
    
 system stops booting and
 needs a series of console inputs (space bar or return) to
 continue booting. Each input advances the process a little
 bit. 
 I have tried to find the
 root cause for the issue but not get success, can you help
 me regarding to this what is the root cause and how i can
 fix this? 
    
 One more thing i observed
 that the space allocated for tty by 'tty_write_room'
 is suddenly consumed by more than 2k at the time of issue
 occurs and gradually
  
 consuming remaining memory
 and when reaches to zero upgrade completely hangs and when
 console inputs (space bar or return) to continue booting,
  
 Each input advances the
 process a little bit. This console i/p's creating some
 space for the same . Is this problem in tty?
  
 one more thing we observed
 that whenever we increase the logging then this problem
 happens regularly. 
    
 [   66.233676]
 EXT3-fs (sda14): using internal journal 
 [   66.233691]
 EXT3-fs (sda14): mounted filesystem with ordered data
 mode                             
  
 [   76.822878]
 par.que...par_queue_user_receive: Freeze check =0 
 [   76.828711]
 par.que...par_queue_user_receive: <*> returned
 -ERESTARTSYS <*> event =-512 
 [   76.837241]
 par_ldisc_open:record is found for ttyS4 
 [   76.842766]
 par.que...par_queue_user_receive: Freeze check =0 
 [   76.848594]
 par.que...par_queue_user_receive: <*> returned
 -ERESTARTSYS <*> event =-512 
 [  101.781654] usb
 1-1.3: USB disconnect, address 3 
 [  104.029178] usb
 1-1.3: new high speed USB device using fsl-ehci and address
 4 
 [  104.159085] scsi2
 : usb-storage 1-1.3:1.0 
 [  105.163726] scsi
 2:0:0:0: Direct-Access     Kingston
 DataTraveler 2.0 1.00 PQ: 0 ANSI: 2 
 [  105.173202] sd
 2:0:0:0: Attached scsi generic sg1 type 0 
 [  105.173686] sd
 2:0:0:0: [sdb] 4006912 512-byte logical blocks: (2.05
 GB/1.91 GiB) 
 [  105.174177] sd
 2:0:0:0: [sdb] Write Protect is off 
 [  105.174188] sd
 2:0:0:0: [sdb] Mode Sense: 23 00 00 00 
 [  105.174197] sd
 2:0:0:0: [sdb] Assuming drive cache: write through 
 [  105.178804] sd
 2:0:0:0: [sdb] Assuming drive cache: write through 
 [  105.178825] 
 sdb: sdb1 
 [  105.295052] sd
 2:0:0:0: [sdb] Assuming drive cache: write through 
 [  105.301142] sd
 2:0:0:0: [sdb] Attached SCSI removable
 disk                      
 - Hangs at this place and
 console i/p’s to continue booting. 
    
 I have tried with
 different sizes and different vendors pen drives but problem
 is the same and occurs at the same place. 
    
 Your valuable inputs and
 suggetions are helpful to fix this issue. 
    
 My kernel version is:
 2.6.35.6-45.fc14.i686 
    
 Thanks in advance for
 helping and replying. 
    
    
 Regards, 
 Narasimharao B 
    
    
    
    
    
 
 
 
 
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