lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite for Android: free password hash cracker in your pocket
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:   Wed, 25 Jan 2017 13:43:58 -0800
From:   Dan Williams <>
To:     Thiago Jung Bauermann <>
Cc:     Jens Axboe <>, Jan Kara <>,
        Rabin Vincent <>,
        "" <>,
        Linux Kernel Mailing List <>,, Andi Kleen <>,
        Wei Fang <>,
        linux-fsdevel <>,
        Christoph Hellwig <>
Subject: Re: [RFC PATCH v2 0/2] block: fix backing_dev_info lifetime

On Mon, Jan 23, 2017 at 1:17 PM, Thiago Jung Bauermann
<> wrote:
> Hello Dan,
> Am Freitag, 6. Januar 2017, 17:02:51 BRST schrieb Dan Williams:
>> v1 of these changes [1] was a one line change to bdev_get_queue() to
>> prevent a shutdown crash when del_gendisk() races the final
>> __blkdev_put().
>> While it is known at del_gendisk() time that the queue is still alive,
>> Jan Kara points to other paths [2] that are racing __blkdev_put() where
>> the assumption that ->bd_queue, or inode->i_wb is valid does not hold.
>> Fix that broken assumption, make it the case that if you have a live
>> block_device, or block_device-inode that the corresponding queue and
>> inode-write-back data is still valid.
>> These changes survive a run of the libnvdimm unit test suite which puts
>> some stress on the block_device shutdown path.
> I realize that the kernel test robot found problems with this series, but FWIW
> it fixes the bug mentioned in [2].

Thanks for the test result. I might take a look at cleaning up the
test robot reports and resubmitting this approach unless Jan beats me
to the punch with his backing_devi_info lifetime change patches.

>> [2]:

Powered by blists - more mailing lists