lkml.org 
[lkml]   [2021]   [Oct]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH v3] block: fix incorrect references to disk objects
From
Date

On 2021/10/18 下午8:26, Matthew Wilcox wrote:
> On Mon, Oct 18, 2021 at 07:58:07PM +0800, Zqiang wrote:
>> When adding partitions to the disk, the reference count of the disk
>> object is increased. then alloc partition device and called
>> device_add(), if the device_add() return error, the reference
>> count of the disk object will be reduced twice, at put_device(pdev)
>> and put_disk(disk). this leads to the end of the object's life cycle
>> prematurely, and trigger following calltrace.
>>
>> __init_work+0x2d/0x50 kernel/workqueue.c:519
>> synchronize_rcu_expedited+0x3af/0x650 kernel/rcu/tree_exp.h:847
>> bdi_remove_from_list mm/backing-dev.c:938 [inline]
>> bdi_unregister+0x17f/0x5c0 mm/backing-dev.c:946
>> release_bdi+0xa1/0xc0 mm/backing-dev.c:968
>> kref_put include/linux/kref.h:65 [inline]
>> bdi_put+0x72/0xa0 mm/backing-dev.c:976
>> bdev_free_inode+0x11e/0x220 block/bdev.c:408
>> i_callback+0x3f/0x70 fs/inode.c:226
>> rcu_do_batch kernel/rcu/tree.c:2508 [inline]
>> rcu_core+0x76d/0x16c0 kernel/rcu/tree.c:2743
>> __do_softirq+0x1d7/0x93b kernel/softirq.c:558
>> invoke_softirq kernel/softirq.c:432 [inline]
>> __irq_exit_rcu kernel/softirq.c:636 [inline]
>> irq_exit_rcu+0xf2/0x130 kernel/softirq.c:648
>> sysvec_apic_timer_interrupt+0x93/0xc0
>>
>> Return directly after calling the put_device().
>>
>> Reported-by: Hao Sun <sunhao.th@gmail.com>
>> Signed-off-by: Zqiang <qiang.zhang1211@gmail.com>
> Fixes: 9d3b8813895d ("block: change the refcounting for partitions")
> Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>

Hello Jens Axboe

The patch description information of the previous v2 version is
incorrect, v3 modified the description information, please applied the
v3 version.

Thanks

Zqiang



\
 
 \ /
  Last update: 2021-10-25 10:28    [W:0.070 / U:0.508 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site