Re: Regression in 2.6.28-rc and 2.6.27-stable - hibernate related

["Rafael J. Wysocki" <rjw@sisk.pl>]

On Sunday, 23 of November 2008, Fabio Comolli wrote:
> Hi.
> As the subject says, I have a strange regression in latest git.
> Sometimes resume from hibernating hangs _after_ the resume stage.
> When the problem happens I usually have to powercycle my laptop.
> 
> The system managed to recover from the hang only twice and this time I
> found in the logs:
> 
> Nov 23 16:43:14 hawking kernel: sd 0:0:0:0: [sda] Starting disk
> Nov 23 16:43:14 hawking kernel: Restarting tasks ... done.
> Nov 23 16:43:52 hawking kernel: ata1.01: exception Emask 0x0 SAct 0x0
> SErr 0x0 action 0x6 frozen
> Nov 23 16:43:52 hawking kernel: ata1.01: cmd
> a0/00:00:00:00:00/00:00:00:00:00/b0 tag 0
> Nov 23 16:43:52 hawking kernel:          cdb 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 00
> Nov 23 16:43:52 hawking kernel:          res
> 40/00:03:00:00:00/00:00:00:00:00/b0 Emask 0x4 (timeout)
> Nov 23 16:43:52 hawking kernel: ata1.01: status: { DRDY }
> Nov 23 16:43:52 hawking kernel: ata1: soft resetting link
> Nov 23 16:43:57 hawking kernel: ata1.01: qc timeout (cmd 0xa1)
> Nov 23 16:43:57 hawking kernel: ata1.01: failed to IDENTIFY (I/O
> error, err_mask=0x4)
> Nov 23 16:43:57 hawking kernel: ata1.01: revalidation failed (errno=-5)
> Nov 23 16:43:57 hawking kernel: ata1: soft resetting link
> Nov 23 16:44:08 hawking kernel: ata1.01: qc timeout (cmd 0xa1)
> Nov 23 16:44:08 hawking kernel: ata1.01: failed to IDENTIFY (I/O
> error, err_mask=0x4)
> Nov 23 16:44:08 hawking kernel: ata1.01: revalidation failed (errno=-5)
> Nov 23 16:44:08 hawking kernel: ata1: soft resetting link
> Nov 23 16:44:38 hawking kernel: ata1.00: configured for UDMA/100
> Nov 23 16:44:38 hawking kernel: ata1.01: configured for MWDMA2
> Nov 23 16:44:38 hawking kernel: ata1: EH complete
> Nov 23 16:44:39 hawking kernel: sd 0:0:0:0: [sda] 156301488 512-byte
> hardware sectors: (80.0 GB/74.5 GiB)
> Nov 23 16:44:39 hawking kernel: sd 0:0:0:0: [sda] Write Protect is off
> Nov 23 16:44:39 hawking kernel: sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
> Nov 23 16:44:39 hawking kernel: sd 0:0:0:0: [sda] Write cache:
> enabled, read cache: enabled, doesn't support DPO or FUA
> Nov 23 16:44:39 hawking kernel: sd 0:0:0:0: [sda] 156301488 512-byte
> hardware sectors: (80.0 GB/74.5 GiB)
> Nov 23 16:44:39 hawking kernel: sd 0:0:0:0: [sda] Write Protect is off
> Nov 23 16:44:39 hawking kernel: sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
> Nov 23 16:44:39 hawking kernel: sd 0:0:0:0: [sda] Write cache:
> enabled, read cache: enabled, doesn't support DPO or FUA
> 
> This problem:
> 
> * never happened in 2.6.27.4
> * happened many times in 2.6.27.5 and .6
> * never happened in 2.6.27.7

Please test 2.6.27.7 a bit more.  It would be helpful to verify it's OK.

> * happened the first time with the current -rc series just now (the
> logs are related to this one)
> 
> This is the first 2.6.28-rc kernel I tried.

Do you mean 2.6.28-rc6?

Rafael