linux-kernel - Re: [syzbot] [fscrypt?] possible deadlock in fscrypt

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Message-ID: <20231127214522.GA1463@sol.localdomain>
Date:   Mon, 27 Nov 2023 13:45:22 -0800
From:   Eric Biggers <ebiggers@...nel.org>
To:     syzbot <syzbot+3a3b5221ffafba7d5204@...kaller.appspotmail.com>
Cc:     jaegeuk@...nel.org, linux-fscrypt@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, tytso@....edu
Subject: Re: [syzbot] [fscrypt?] possible deadlock in fscrypt_initialize (2)

On Wed, Mar 01, 2023 at 07:04:59AM -0800, syzbot wrote:
> -> #0 (fscrypt_init_mutex){+.+.}-{3:3}:
>        check_prev_add kernel/locking/lockdep.c:3098 [inline]
>        check_prevs_add kernel/locking/lockdep.c:3217 [inline]
>        validate_chain kernel/locking/lockdep.c:3832 [inline]
>        __lock_acquire+0x2ec7/0x5d40 kernel/locking/lockdep.c:5056
>        lock_acquire kernel/locking/lockdep.c:5669 [inline]
>        lock_acquire+0x1e3/0x670 kernel/locking/lockdep.c:5634
>        __mutex_lock_common kernel/locking/mutex.c:603 [inline]
>        __mutex_lock+0x12f/0x1350 kernel/locking/mutex.c:747
>        fscrypt_initialize+0x40/0xa0 fs/crypto/crypto.c:326
>        fscrypt_setup_encryption_info+0xef/0xeb0 fs/crypto/keysetup.c:563
>        fscrypt_get_encryption_info+0x375/0x450 fs/crypto/keysetup.c:668
>        fscrypt_setup_filename+0x23c/0xec0 fs/crypto/fname.c:458
>        ext4_fname_setup_filename+0x8c/0x110 fs/ext4/crypto.c:28
>        ext4_add_entry+0x3aa/0xe30 fs/ext4/namei.c:2380
>        ext4_rename+0x19ff/0x26d0 fs/ext4/namei.c:3911
>        ext4_rename2+0x1c7/0x270 fs/ext4/namei.c:4193
>        vfs_rename+0xef6/0x17a0 fs/namei.c:4772
>        do_renameat2+0xb62/0xc90 fs/namei.c:4923
>        __do_sys_renameat2 fs/namei.c:4956 [inline]
>        __se_sys_renameat2 fs/namei.c:4953 [inline]
>        __ia32_sys_renameat2+0xe8/0x120 fs/namei.c:4953
>        do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
>        __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178
>        do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203
>        entry_SYSENTER_compat_after_hwframe+0x70/0x82

#syz dup: possible deadlock in start_this_handle (4)

See https://lore.kernel.org/linux-fscrypt/Y%2F6aDmrx8Q9ob+Zi@sol.localdomain/

- Eric