linux-kernel - Re: [PATCH -next] reiserfs: fix blkdev_put() warning from release_journal

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Date:   Tue, 20 Jun 2023 07:19:38 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     hch@....de, jack@...e.cz, jinpu.wang@...os.com,
        dchinner@...hat.com, hare@...e.de, trix@...hat.com,
        bvanassche@....org, yukuai3@...wei.com, willy@...radead.org,
        yi.zhang@...wei.com, dsterba@...e.com, brauner@...nel.org,
        Yu Kuai <yukuai1@...weicloud.com>
Cc:     reiserfs-devel@...r.kernel.org, linux-kernel@...r.kernel.org,
        yangerkun@...wei.com
Subject: Re: [PATCH -next] reiserfs: fix blkdev_put() warning from
 release_journal_dev()


On Tue, 20 Jun 2023 19:13:22 +0800, Yu Kuai wrote:
> In journal_init_dev(), if super bdev is used as 'j_dev_bd', then
> blkdev_get_by_dev() is called with NULL holder, otherwise, holder will
> be journal. However, later in release_journal_dev(), blkdev_put() is
> called with journal unconditionally, cause following warning:
> 
> WARNING: CPU: 1 PID: 5034 at block/bdev.c:617 bd_end_claim block/bdev.c:617 [inline]
> WARNING: CPU: 1 PID: 5034 at block/bdev.c:617 blkdev_put+0x562/0x8a0 block/bdev.c:901
> RIP: 0010:blkdev_put+0x562/0x8a0 block/bdev.c:901
> Call Trace:
>  <TASK>
>  release_journal_dev fs/reiserfs/journal.c:2592 [inline]
>  free_journal_ram+0x421/0x5c0 fs/reiserfs/journal.c:1896
>  do_journal_release fs/reiserfs/journal.c:1960 [inline]
>  journal_release+0x276/0x630 fs/reiserfs/journal.c:1971
>  reiserfs_put_super+0xe4/0x5c0 fs/reiserfs/super.c:616
>  generic_shutdown_super+0x158/0x480 fs/super.c:499
>  kill_block_super+0x64/0xb0 fs/super.c:1422
>  deactivate_locked_super+0x98/0x160 fs/super.c:330
>  deactivate_super+0xb1/0xd0 fs/super.c:361
>  cleanup_mnt+0x2ae/0x3d0 fs/namespace.c:1247
>  task_work_run+0x16f/0x270 kernel/task_work.c:179
>  exit_task_work include/linux/task_work.h:38 [inline]
>  do_exit+0xadc/0x2a30 kernel/exit.c:874
>  do_group_exit+0xd4/0x2a0 kernel/exit.c:1024
>  __do_sys_exit_group kernel/exit.c:1035 [inline]
>  __se_sys_exit_group kernel/exit.c:1033 [inline]
>  __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1033
>  do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>  do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
>  entry_SYSCALL_64_after_hwframe+0x63/0xcd
> 
> [...]

Applied, thanks!

[1/1] reiserfs: fix blkdev_put() warning from release_journal_dev()
      commit: c576c4bf9ecfa3fb9f7b11681cc2f60aba5276c4

Best regards,
-- 
Jens Axboe