Le 24.11.2007 07:42, James Bottomley a écrit : > On Fri, 2007-11-23 at 18:52 +0100, Laurent Riffard wrote: >> Le 23.11.2007 12:38, Hannes Reinecke a écrit : >>> Hannes Reinecke wrote: >>>> Laurent Riffard wrote: >>>>> Le 21.11.2007 23:41, Andrew Morton a écrit : >>>>>> On Wed, 21 Nov 2007 22:45:22 +0100 >>>>>> Laurent Riffard <laurent.riffard@xxxxxxx> wrote: >>>>>> >>>>>>> Le 21.11.2007 05:45, Andrew Morton a écrit : >>>>>>>> ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.24-rc3/2.6.24-rc3-mm1/ >>>>>>> Hello, >>>>>>> >>>>>>> My system hangs shortly after I logged in Gnome desktop. SysRq-W shows >>>>>>> that a bunch of task are blocked in "D" state, they seem to wait for >>>>>>> some I/O completion. I can try to hand-copy some data if requested. >>>>>>> >>>>>>> I found these messages in dmesg: >>>>>>> >>>>>>> ~$ grep -C2 end_request dmesg-2.6.24-rc3-mm1 >>>>>>> EXT3-fs: mounted filesystem with ordered data mode. >>>>>>> sd 0:0:0:0: [sda] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK,SUGGEST_OK >>>>>>> end_request: I/O error, dev sda, sector 16460 >>>>>>> ReiserFS: sda7: found reiserfs format "3.6" with standard journal >>>>>>> ReiserFS: sda7: using ordered data mode >>>>>>> -- >>>>>>> ReiserFS: sda7: Using r5 hash to sort names >>>>>>> sd 0:0:1:0: [sdb] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK,SUGGEST_OK >>>>>>> end_request: I/O error, dev sdb, sector 19632 >>>>>>> sd 0:0:1:0: [sdb] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK,SUGGEST_OK >>>>>>> end_request: I/O error, dev sdb, sector 40037363 >>>>>>> Adding 1048568k swap on /dev/mapper/vglinux1-lvswap. Priority:-1 extents:1 across:1048568k >>>>>>> lp0: using parport0 (interrupt-driven). >>>>>>> >>>>>>> These errors occur *only* with 2.6.24-rc3-mm1, they are 100% reproducible. >>>>>>> 2.6.24-rc3 and 2.6.24-rc2-mm1 are fine. >>>>>>> >>>>>>> Maybe something is broken in pata_via driver ? >>>>>>> >>>>>> Could be - libata-reimplement-ata_acpi_cbl_80wire-using-ata_acpi_gtm_xfermask.patch >>>>>> and pata_amd-pata_via-de-couple-programming-of-pio-mwdma-and-udma-timings.patch >>>>>> touch pata_via.c. >>>>> None of the above... >>>>> >>>>> I did a bisection, it spotted git-scsi-misc.patch. >>>>> I just run 2.6.24-rc3-mm1 + revert-git-scsi-misc.patch, and it works fine. >>>>> >>>>> I guess commit 8655a546c83fc43f0a73416bbd126d02de7ad6c0 "[SCSI] Do not >>>>> requeue requests if REQ_FAILFAST is set" is the real culprit. The other >>>>> commits are touching documentation or drivers I don't use. I'll try >>>>> to revert only this one this evening. >> I can confirm : reverting commit 8655a546c83fc43f0a73416bbd126d02de7ad6c0 >> does fix the problem. >> >>>> Hmm. Weird. I'll have a look into it. Apparently I'll be returning an error where >>>> I shouldn't. Checking ... >>>> >>> Ok, found it. We are blocking even special commands (ie requests with PREEMPT not set) >>> when FAILFAST is set. Which is clearly wrong. The attached patch fixes this. >> Sorry, it's not enough. 2.6.24-rc3-mm1 + your patch still hangs with I/O errors. > > I think the problem is the way we treat BLOCKED and QUIESCED (the latter > is the state that the domain validation uses and which we cannot kill > fastfail on). It's definitely wrong to kill fastfail requests when the > state is QUIESCE. > > This patch (which is applied on top of Hannes original) separates the > BLOCK and QUIESCE states correctly ... does this fix the problem? No, it doesn't help... (2.6.24-rc3-mm1 + your patch still has problems) > James > > diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c > index 13e7e09..a7cf23a 100644 > --- a/drivers/scsi/scsi_lib.c > +++ b/drivers/scsi/scsi_lib.c > @@ -1279,18 +1279,21 @@ int scsi_prep_state_check(struct scsi_device *sdev, struct request *req) > "rejecting I/O to dead device\n"); > ret = BLKPREP_KILL; > break; > - case SDEV_QUIESCE: > case SDEV_BLOCK: > /* > - * If the devices is blocked we defer normal commands. > - */ > - if (!(req->cmd_flags & REQ_PREEMPT)) > - ret = BLKPREP_DEFER; > - /* > * Return failfast requests immediately > */ > if (req->cmd_flags & REQ_FAILFAST) > ret = BLKPREP_KILL; > + > + /* fall through */ > + > + case SDEV_QUIESCE: > + /* > + * If the devices is blocked we defer normal commands. > + */ > + if (!(req->cmd_flags & REQ_PREEMPT)) > + ret = BLKPREP_DEFER; > break; > default: > /* > - To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
