[pkg-cryptsetup-devel] Bug#791944: Bug#791944: udev: shutdown hangs because of missing swapoff

[Jonas Meurer]

Hi Jochen,

Am 01.10.2015 um 00:04 schrieb Michael Biebl:
> Control: reassign -1 cryptsetup
> 
> Am 10.07.2015 um 07:23 schrieb Jochen Sprickerhof:
>> I've debugged a little more and actually it's not only enough to do a
>> swapoff -a, but you need also a cryptsetup close /dev/mapper/swap0
>> (sorry for forgetting it initiallly).
>> The shutdown hangs in the do_close() of
>> /lib/cryptsetup/cryptdisks.functions (line 556), where cryptsetup remove
>> is call. Adding a -v --debug gives:
>>
>> [..]
>> # Initialising device-mapper backend library.
>> # dm table swap0 OFW     [16384[ (*1)
>> # Trying to open and read device /dev/sda5.
>> # Deactivating volume swap0.
>> # dm status swap0  OF   [16384] (*1)
>> # Udev cookie 0xd4d9dac (semid 65536) created
>> # Udev cookie 0xd4d9dac (semid 65536) incremented to 1
>> # Udev cookie 0xd4d9dac (semid 65536) incremented to 2
>> # Udev cookie 0xd4d9dac (semid 65536) assigned to REMOVE task(2) with flags      (0x0)
>> # dm remove swap0  OF     [16384] (*1)
>> # swap0: Stacking NODE_DEL [verify_udev]
>> # Udev cookie 0xd4d9dac (semid 65536) decrementing to 1
>> # Udev cookie 0xd4d9dac (semid 65536) waiting for zero
> 
> this looks like a cryptsetup/device-mapper issue.

Could you try to replace 'cryptsetup remove' by 'dmsetup --check close'
and see whether the shutdown process still hangs?

Cheers
 jonas


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