linux-ext4 - Re: [PATCH v4 1/3] ext4: alloc test super block from sget

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Date: Mon, 4 Mar 2024 10:55:29 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: Kemeng Shi <shikemeng@...weicloud.com>
Cc: tytso@....edu, adilger.kernel@...ger.ca, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org, naresh.kamboju@...aro.org,
	daniel.diaz@...aro.org, brauner@...nel.org
Subject: Re: [PATCH v4 1/3] ext4: alloc test super block from sget

On Tue, Mar 05, 2024 at 12:35:41AM +0800, Kemeng Shi wrote:
> This fix the oops in ext4 unit test which is cuased by NULL sb.s_user_ns
> as following:
> <4>[ 14.344565] map_id_range_down (kernel/user_namespace.c:318)
> <4>[ 14.345378] make_kuid (kernel/user_namespace.c:415)
> <4>[ 14.345998] inode_init_always (include/linux/fs.h:1375 fs/inode.c:174)
> <4>[ 14.346696] alloc_inode (fs/inode.c:268)
> <4>[ 14.347353] new_inode_pseudo (fs/inode.c:1007)
> <4>[ 14.348016] new_inode (fs/inode.c:1033)
> <4>[ 14.348644] ext4_mb_init (fs/ext4/mballoc.c:3404 fs/ext4/mballoc.c:3719)
> <4>[ 14.349312] mbt_kunit_init (fs/ext4/mballoc-test.c:57
> fs/ext4/mballoc-test.c:314)
> <4>[ 14.349983] kunit_try_run_case (lib/kunit/test.c:388 lib/kunit/test.c:443)
> <4>[ 14.350696] kunit_generic_run_threadfn_adapter (lib/kunit/try-catch.c:30)
> <4>[ 14.351530] kthread (kernel/kthread.c:388)
> <4>[ 14.352168] ret_from_fork (arch/arm64/kernel/entry.S:861)
> <0>[ 14.353385] Code: 52808004 b8236ae7 72be5e44 b90004c4 (38e368a1)
> 
> Alloc test super block from sget to properly initialize test super block
> to fix the issue.
> 
> Signed-off-by: Kemeng Shi <shikemeng@...weicloud.com>
> Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>
> Reported-by: Guenter Roeck <linux@...ck-us.net>

Tested-by: Guenter Roeck <linux@...ck-us.net>