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From: Luis Chamberlain <mcgrof@kernel.org>
To: minchan@kernel.org, ngupta@vflare.org, sergey.senozhatsky.work@gmail.com
Cc: axboe@kernel.dk, mbenes@suse.com, mcgrof@kernel.org,
	linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 0/2] zram: fix few ltp zram02.sh crashes
Date: Sat,  6 Mar 2021 02:20:33 +0000	[thread overview]
Message-ID: <20210306022035.11266-1-mcgrof@kernel.org> (raw)

LTP's zram02.sh script can be used to crah your kernel pretty badly.

  cd testcases/kernel/device-drivers/zram
  while true; do PATH=$PATH:$PWD:$PWD/../../../lib/ ./zram02.sh; done

This won't do much, however if you run this in two separate windows
you'll see the kernel become unhappy quite fast. The crux of this
issue was mishandling of cpu hotplug multistate on the zram driver
in consideration for driver unload. However there was still another
long lasting bug present: races with sysfs attributes and driver
unload.

This series fixes these issues.

[0] https://github.com/linux-test-project/ltp.git 

Luis Chamberlain (2):
  zram: fix crashes due to use of cpu hotplug multistate
  zram: fix races of sysfs attribute removal and usage

 drivers/block/zram/zram_drv.c | 82 +++++++++++++++++++++++++++++++----
 1 file changed, 74 insertions(+), 8 deletions(-)

-- 
2.30.1


             reply	other threads:[~2021-03-06  2:21 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-06  2:20 Luis Chamberlain [this message]
2021-03-06  2:20 ` [PATCH 1/2] zram: fix crashes due to use of cpu hotplug multistate Luis Chamberlain
2021-03-09  2:55   ` Minchan Kim
2021-03-10 13:11     ` Luis Chamberlain
2021-03-10 21:25       ` Luis Chamberlain
2021-03-12  2:08       ` Minchan Kim
2021-03-10 21:21     ` Luis Chamberlain
2021-03-12  2:14       ` Minchan Kim
2021-03-12 18:32         ` Luis Chamberlain
2021-03-12 19:28           ` Minchan Kim
2021-03-19 19:09             ` Luis Chamberlain
2021-03-22 16:37               ` Minchan Kim
2021-03-22 20:41                 ` Luis Chamberlain
2021-03-22 22:12                   ` Minchan Kim
2021-04-01 23:59                     ` Luis Chamberlain
2021-04-02  7:54                       ` Greg KH
2021-04-02 18:30                         ` Luis Chamberlain
2021-04-03  6:13                           ` Greg KH
     [not found]                             ` <20210406003152.GZ4332@42.do-not-panic.com>
2021-04-06 12:00                               ` Miroslav Benes
2021-04-06 15:54                                 ` Josh Poimboeuf
2021-04-07 14:09                                   ` Peter Zijlstra
2021-04-07 15:30                                     ` Josh Poimboeuf
2021-04-07 16:48                                       ` Peter Zijlstra
2021-04-07 20:17                         ` Josh Poimboeuf
2021-04-08  6:18                           ` Greg KH
2021-04-08 13:16                             ` Steven Rostedt
2021-04-08 13:37                             ` Josh Poimboeuf
2021-04-08  1:37                         ` Thomas Gleixner
2021-04-08  6:16                           ` Greg KH
2021-04-08  8:01                             ` Jiri Kosina
2021-04-08  8:09                               ` Greg KH
2021-04-08  8:35                                 ` Jiri Kosina
2021-04-08  8:55                                   ` Greg KH
2021-04-08 18:40                                     ` Luis Chamberlain
2021-04-09  3:01                                     ` Kees Cook
2021-04-05 17:07                       ` Minchan Kim
2021-04-05 19:00                         ` Luis Chamberlain
2021-04-05 19:58                           ` Minchan Kim
2021-04-06  0:29                             ` Luis Chamberlain
2021-04-07  1:23                               ` Minchan Kim
2021-04-07  1:38                                 ` Minchan Kim
2021-04-07 14:52                                   ` Luis Chamberlain
2021-04-07 14:50                                 ` Luis Chamberlain
2021-03-06  2:20 ` [PATCH 2/2] zram: fix races of sysfs attribute removal and usage Luis Chamberlain

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