linux-kernel - Re: [RFC for-6.10/block] loop: Fix a race between loop detach and loop open

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Date: Sun, 28 Apr 2024 21:49:40 +0000
From: Chaitanya Kulkarni <chaitanyak@...dia.com>
To: Gulam Mohamed <gulam.mohamed@...cle.com>, "linux-block@...r.kernel.org"
	<linux-block@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
CC: "axboe@...nel.dk" <axboe@...nel.dk>, Shinichiro Kawasaki
	<shinichiro.kawasaki@....com>
Subject: Re: [RFC for-6.10/block] loop: Fix a race between loop detach and
 loop open


> Test case
> =========
> Test case involves the following two scripts:
> 
> script1.sh
> ----------
> while [ 1 ];
> do
> 	losetup -P -f /home/opt/looptest/test10.img
> 	blkid /dev/loop0p1
> done
> 
> script2.sh
> ----------
> while [ 1 ];
> do
> 	losetup -d /dev/loop0
> done
> 
> Without fix, the following IO errors have been observed:
> 
> kernel: __loop_clr_fd: partition scan of loop0 failed (rc=-16)
> kernel: I/O error, dev loop0, sector 20971392 op 0x0:(READ) flags 0x80700
>          phys_seg 1 prio class 0
> kernel: I/O error, dev loop0, sector 108868 op 0x0:(READ) flags 0x0
>          phys_seg 1 prio class 0
> kernel: Buffer I/O error on dev loop0p1, logical block 27201, async page
>          read
> 


can you please submit the blktest for this issue ? [1]

Please CC Shinichiro Kawasaki <shinichiro.kawasaki@....com> (added here) 
when you submit blktests.

-ck

[1] https://github.com/osandov/blktests