Re: Bus Error on Development Server

On 2/28/14 6:16 PM, Gkpetrak wrote:

Hello,

I was trying to process Images with some python scripts, when I receive bus error. After that I had many bus errors on different programs.
Finally I tried to start django' development server, and I received the same error.

The "after that I had many bus errors on different programs" is the clue that perhaps your physical memory has a bad spot.

Your image processing might have used more physical memory than your typical computer load uses, and ended up in a bad part of memory.

I would recommend running an intensive memory test (e.g. memtest86+) to isolate which memory chip is at fault, and either yank it or replace it.

hth

                                - Tom

I know that this error happens when a process is trying to access memory  that the CPU cannot physically address.    I checked my log files and the output of the error is the following:

T02:13:26.879355+02:00 suse-pc kernel: [ 9976.488797] ata1.00: exception Emask 0x0 SAct 0x1 SErr 0x0 action 0x0    2014-03-01T02:13:26.879402+02:00 suse-pc kernel: [ 9976.488806] ata1.00: irq_stat 0x40000008    2014-03-01T02:13:26.879413+02:00 suse-pc kernel: [ 9976.488813] ata1.00: failed command: READ FPDMA QUEUED    2014-03-01T02:13:26.879419+02:00 suse-pc kernel: [   9976.488826] ata1.00: cmd 60/08:00:50:8d:75/00:00:39:00:00/40 tag 0 ncq   4096 in    2014-03-01T02:13:26.879428+02:00 suse-pc kernel: [   9976.488826]          res 41/40:08:51:8d:75/00:00:39:00:00/00 Emask   0x409 (media error) <F>  2014-03-01T02:13:26.879434+02:00 suse-pc kernel: [ 9976.488832] ata1.00: status: { DRDY ERR }    2014-03-01T02:13:26.879437+02:00 suse-pc kernel: [ 9976.488836] ata1.00: error: { UNC }    2014-03-01T02:13:26.948294+02:00 suse-pc kernel: [ 9976.557999] ata1.00: configured for UDMA/133    2014-03-01T02:13:26.948313+02:00 suse-pc kernel: [ 9976.558034] sd 0:0:0:0: [sda] Unhandled sense code    2014-03-01T02:13:26.948315+02:00 suse-pc kernel: [ 9976.558040] sd 0:0:0:0: [sda]      2014-03-01T02:13:26.948316+02:00 suse-pc kernel: [ 9976.558044] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE    2014-03-01T02:13:26.948317+02:00 suse-pc kernel: [ 9976.558048] sd 0:0:0:0: [sda]      2014-03-01T02:13:26.948318+02:00 suse-pc kernel: [ 9976.558052] Sense Key : Medium Error [current] [descriptor]    2014-03-01T02:13:26.948320+02:00 suse-pc kernel: [ 9976.558059] Descriptor sense data with sense descriptors (in hex):    2014-03-01T02:13:26.948321+02:00 suse-pc kernel: [ 9976.558062]         72 03 11 04 00 00 00 0c 00 0a 80 00 00 00 00 00    2014-03-01T02:13:26.948321+02:00 suse-pc kernel: [ 9976.558081]         39 75 8d 51    2014-03-01T02:13:26.948335+02:00 suse-pc kernel: [ 9976.558090] sd 0:0:0:0: [sda]      2014-03-01T02:13:26.948338+02:00 suse-pc kernel: [ 9976.558095] Add. Sense: Unrecovered read error - auto reallocate failed    2014-03-01T02:13:26.948339+02:00 suse-pc kernel: [ 9976.558099] sd 0:0:0:0: [sda] CDB:    2014-03-01T02:13:26.948340+02:00 suse-pc kernel: [ 9976.558102] Read(10): 28 00 39 75 8d 50 00 00 08 00    2014-03-01T02:13:26.948341+02:00 suse-pc kernel: [ 9976.558119] end_request: I/O error, dev sda, sector 964005201    2014-03-01T02:13:26.948342+02:00 suse-pc kernel: [ 9976.558207] ata1: EH complete        Any ideas ?     How can I fix it ?    Regards,  George 

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