linux-kernel - Reminder: 4 open syzbot bugs in sound subsystem

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Date:   Tue, 9 Jul 2019 13:18:14 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     alsa-devel@...a-project.org, Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>
Cc:     linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Reminder: 4 open syzbot bugs in sound subsystem

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Of the currently open syzbot reports against the upstream kernel, I've manually
marked 4 of them as possibly being bugs in the sound subsystem.  I've listed
these reports below, sorted by an algorithm that tries to list first the reports
most likely to be still valid, important, and actionable.

If you believe a bug is no longer valid, please close the syzbot report by
sending a '#syz fix', '#syz dup', or '#syz invalid' command in reply to the
original thread, as explained at https://goo.gl/tpsmEJ#status

If you believe I misattributed a bug to the sound subsystem, please let me know,
and if possible forward the report to the correct people or mailing list.

Here are the bugs:

--------------------------------------------------------------------------------
Title:              INFO: rcu detected stall in snd_seq_write
Last occurred:      72 days ago
Reported:           316 days ago
Branches:           Mainline and others
Dashboard link:     https://syzkaller.appspot.com/bug?id=33501520944e11adedf1c454eec4cb818bee16c8
Original thread:    https://lkml.kernel.org/lkml/000000000000e5050205746dcbb0@google.com/T/#u

This bug has a syzkaller reproducer only.

The original thread for this bug received 1 reply, 315 days ago.

If you fix this bug, please add the following tag to the commit:
    Reported-by: syzbot+97aae04ce27e39cbfca9@...kaller.appspotmail.com

If you send any email or patch for this bug, please consider replying to the
original thread.  For the git send-email command to use, or tips on how to reply
if the thread isn't in your mailbox, see the "Reply instructions" at
https://lkml.kernel.org/r/000000000000e5050205746dcbb0@google.com

--------------------------------------------------------------------------------
Title:              WARNING: suspicious RCU usage in line6_pcm_acquire
Last occurred:      44 days ago
Reported:           75 days ago
Branches:           Mainline (with usb-fuzzer patches)
Dashboard link:     https://syzkaller.appspot.com/bug?id=a0ea128a37bfe56208042c02d080873dcbdf69a0
Original thread:    https://lkml.kernel.org/lkml/0000000000007cb1ee0587591549@google.com/T/#u

Unfortunately, this bug does not have a reproducer.

No one has replied to the original thread for this bug yet.

This looks like a bug in a sound USB driver.

If you fix this bug, please add the following tag to the commit:
    Reported-by: syzbot+06b7a5a8c4acc0445995@...kaller.appspotmail.com

If you send any email or patch for this bug, please consider replying to the
original thread.  For the git send-email command to use, or tips on how to reply
if the thread isn't in your mailbox, see the "Reply instructions" at
https://lkml.kernel.org/r/0000000000007cb1ee0587591549@google.com

--------------------------------------------------------------------------------
Title:              KASAN: use-after-free Read in wake_up_if_idle
Last occurred:      117 days ago
Reported:           253 days ago
Branches:           Mainline and others
Dashboard link:     https://syzkaller.appspot.com/bug?id=b1e300cd7b124fc83dd4199d4d1df26310111b0f
Original thread:    https://lkml.kernel.org/lkml/00000000000066ab7105795f245e@google.com/T/#u

Unfortunately, this bug does not have a reproducer.

No one replied to the original thread for this bug.

If you fix this bug, please add the following tag to the commit:
    Reported-by: syzbot+2c1253bc508adef78a7f@...kaller.appspotmail.com

If you send any email or patch for this bug, please consider replying to the
original thread.  For the git send-email command to use, or tips on how to reply
if the thread isn't in your mailbox, see the "Reply instructions" at
https://lkml.kernel.org/r/00000000000066ab7105795f245e@google.com

--------------------------------------------------------------------------------
Title:              INFO: task hung in snd_seq_write
Last occurred:      110 days ago
Reported:           315 days ago
Branches:           Mainline and others
Dashboard link:     https://syzkaller.appspot.com/bug?id=9366cef8455b032553567ce096a5b31d8307b7dc
Original thread:    https://lkml.kernel.org/lkml/0000000000001f74de0574710d3e@google.com/T/#u

Unfortunately, this bug does not have a reproducer.

No one replied to the original thread for this bug.

If you fix this bug, please add the following tag to the commit:
    Reported-by: syzbot+4c595632b98bb8ffcc66@...kaller.appspotmail.com

If you send any email or patch for this bug, please consider replying to the
original thread.  For the git send-email command to use, or tips on how to reply
if the thread isn't in your mailbox, see the "Reply instructions" at
https://lkml.kernel.org/r/0000000000001f74de0574710d3e@google.com