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Occasionally people report problem with reboot/poweroff operations hanging in
the middle. One known cause is when a new transaction to start a unit is
enqueued while the shutdown is going on. The start of the unit conflicts with
the shutdown jobs, so they get cancelled. The failure case can be quite unpleasant,
becase getty and sshd may already be stopped.
Fix it by using irreversible jobs for shutdown (reboot/poweroff/...) actions.
This applies to commands like "reboot", "telinit 6", "systemctl reboot". Should
someone desire to use reversible jobs, they can say "systemctl start reboot.target".`
Add a new job mode: replace-irreversibly. Jobs enqueued using this mode
cannot be implicitly canceled by later enqueued conflicting jobs.
They can however still be canceled with an explicit "systemctl cancel"
call.
"systemctl default" should behave identically to "telinit N" (where N is the
corresponding runlevel target number), therefore it should use isolate job mode
too.
Documentation states that 0 is correct, and all other
similar functions return 0 on success.
Pointed-out-by: Steven Hiscocks <steven-systemd@hiscocks.me.uk>
On Thu, Feb 7, 2013 at 3:52 PM, Robert Milasan <rmilasan@suse.com> wrote:
> Hi, seems that using some strange usb devices with really bogus serial
> numbers usb_id creates links with junk strings in it:
>
> /dev/disk/by-id/usb-TSSTcorp_BDDVDW_SE-506AB_㡒䍌䜶䉗ぁㄴ㌴†ँ-0:0
>
> Initially was believed that usb_id is to blame, then the kernel, but it
> turns out that really the usb cd/dvd drive has this bogus serial number:
>
> output from dmesg:
> [ 538.200160] usb 1-2: new high-speed USB device number 5 using
> ehci_hcd [ 538.335067] usb 1-2: New USB device found, idVendor=0e8d,
> idProduct=1956 [ 538.335080] usb 1-2: New USB device strings: Mfr=1,
> Product=2, SerialNumber=3 [ 538.335089] usb 1-2: Product: MT1956
> [ 538.335097] usb 1-2: Manufacturer: MediaTek Inc
> [ 538.335105] usb 1-2: SerialNumber:
> \xffffffe3\xffffffa1\xffffff92\xffffffe4\xffffff8d\xffffff8c ...
> [ 538.337540] scsi6 : usb-storage 1-2:1.0 [ 539.341385] scsi 6:0:0:0:
> CD-ROM TSSTcorp BDDVDW SE-506AB TS00 PQ: 0 ANSI: 0
> [ 539.354240] sr0: scsi3-mmc drive: 0x/24x writer dvd-ram cd/rw
> xa/form2 cdda tray [ 539.354777] sr 6:0:0:0: Attached scsi CD-ROM sr0
> [ 539.355122] sr 6:0:0:0: Attached scsi generic sg2 type 5
Turning off filtering with --filter is just too confusing.
Config option "Filter" doesn't have to be changed, here
"Filter=yes" already meant to filter.
