On Fri, 7 May 2010, Bruno [UTF-8] Prémont wrote: > Hi, > > On a SMP system I've hit a race condition between suspend and hddtemp > checking disk's temperature. > > System details: > - Dual-core AMD Turion CPU > - 00:12.0 SATA controller [0106]: ATI Technologies Inc SB600 Non-Raid-5 SATA [1002:4380] > - hddtemp-0.3_beta15 (Gentoo package app-admin/hddtemp-0.3_beta15-r3) > - Linus' tree shortly after v2.6.34-rc6, at commit > be1066bbcd443a65df312fdecea7e4959adedb45 with some drm updates on > top of it. > > > It looked like hddtemp had sent the SMART request to disk right before > suspend and during suspend process ata2 did complain without aborting > suspend (see below). > After resume access to that disk was dead-locked (any further > attempt to suspend timed-out freezing hddtemp and any access attempt > towards that disk did put userspace tasks in uninterruptible state and > caused soft-raid to mark the disk failed). > > Is suspend not waiting on SG_IO ioctls to complete (at ata host level)? If you use the libata driver then the ATA I/O is handled by the SCSI midlayer. The SCSI midlayer waits for the device's command queue to drain completely before initiating a suspend. Furthermore, the hddtemp process has to get frozen before the suspend can begin, and I believe a process cannot be frozen while it is waiting for an SG_IO to complete. At any rate, you should try posting this bug report on the linux-scsi mailing list. Alan Stern _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
