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    SubjectRe: [syzbot] [kernfs?] possible deadlock in kernfs_fop_llseek
    Date
    On Wed, 03 Apr 2024 11:23:26 -0700
    > syzbot found the following issue on:
    >
    > HEAD commit: fe46a7dd189e Merge tag 'sound-6.9-rc1' of git://git.kernel..
    > git tree: upstream
    > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15c38139180000

    Test Al's idea.

    #syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git fe46a7dd189e

    --- x/fs/overlayfs/util.c
    +++ y/fs/overlayfs/util.c
    @@ -639,6 +639,8 @@ static int kernfs_fop_open(struct inode
    */
    if (has_mmap)
    mutex_init(&of->mutex);
    + else if (file->f_mode & FMODE_WRITE)
    + mutex_init(&of->mutex);
    else
    mutex_init(&of->mutex);

    --
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