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Date:   Thu, 13 Aug 2020 12:43:50 -0600
From:   Jens Axboe <>
To:     syzbot <>,,,,,
Subject: Re: KASAN: use-after-free Read in idr_for_each

On 8/13/20 11:28 AM, syzbot wrote:
> Hello,
> syzbot found the following issue on:
> HEAD commit:    fb893de3 Merge tag 'tag-chrome-platform-for-v5.9' of git:/..
> git tree:       upstream
> console output:
> kernel config:
> dashboard link:
> compiler:       gcc (GCC) 10.1.0-syz 20200507
> syz repro:
> C reproducer:
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by:
> ==================================================================
> BUG: KASAN: use-after-free in radix_tree_next_slot include/linux/radix-tree.h:421 [inline]
> BUG: KASAN: use-after-free in idr_for_each+0x206/0x220 lib/idr.c:202
> Read of size 8 at addr ffff888082058c78 by task syz-executor999/3765

Should already be fixed by:

commit 6d816e088c359866f9867057e04f244c608c42fe
Author: Jens Axboe <>
Date:   Tue Aug 11 08:04:14 2020 -0600

    io_uring: hold 'ctx' reference around task_work queue + execute

which is going upstream soon.

#syz dup: KASAN: use-after-free Read in io_async_task_func

Jens Axboe

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