> Hm, no one seems to have said anything for the past 5 years about this.
It definitely is hard to hit -- you have to do "shutdown" or "reboot" right as something schedules async work. In our case we have some systems with a large and slightly flaky SAS fabric, so there's a constant level of re-probing SCSI disks, and we occasionally see reboots hanging due to waiting for never-finishing sd probe async work. AFAICT the synchronization does nothing useful and is just a remnant of a patch series where the real meat didn't get applied. But of course it would be great if Shaohua could confirm my understanding. Thanks, Roland -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
