public inbox for [email protected]
 help / color / mirror / Atom feed
From: Jiacheng Xu <[email protected]>
To: [email protected], [email protected],
	[email protected], [email protected]
Cc: [email protected]
Subject: possible deadlock in io_poll_double_wake
Date: Tue, 30 Aug 2022 21:33:03 +0800	[thread overview]
Message-ID: <CAO4S-me0tq289wabwsL4xbRXfHgaetqvExt8+ZyrKLxfGzLteA@mail.gmail.com> (raw)

Hello,

When using modified Syzkaller to fuzz the Linux kernel-5.19, the
following crash was triggered. Though the issue seems to get fixed on
syzbot(https://syzkaller.appspot.com/bug?id=12e4415bf5272f433acefa690478208f3be3be2d),
it could still be triggered with the following repro.
We would appreciate a CVE ID if this is a security issue.

HEAD commit: 568035b01cfb Linux-5.15.58
git tree: upstream

console output:
https://drive.google.com/file/d/1e4DHaUKhY9DLZJK_pNScWHydUv-MaD9_/view?usp=sharing
https://drive.google.com/file/d/1NmOGWcfPnY2kSrS0nOwvG1AZ923jFQ3p/view?usp=sharing
kernel config: https://drive.google.com/file/d/1wgIUDwP5ho29AM-K7HhysSTfWFpfXYkG/view?usp=sharing
syz repro: https://drive.google.com/file/d/1e5xY8AOMimLbpAlOOupmGYC_tUA3sa8k/view?usp=sharing
C reproducer: https://drive.google.com/file/d/1esAe__18Lt7and43QdXFfI6GJCsF85_z/view?usp=sharing

Description:
spin_lock_irqsave() in __wake_up_common_lock() is called before waking
up a task. However, spin_lock_irqsave() has to be called once in
io_poll_double_wake().
such call stack is:

   snd_pcm_post_stop()
      __wake_up_common_lock()
         spin_lock_irqsave()
             io_poll_double_wake()
                 spin_lock_irqsave()

Environment:
Ubuntu 20.04 on Linux 5.4.0
QEMU 4.2.1:
qemu-system-x86_64 \
  -m 2G \
  -smp 2 \
  -kernel /home/workdir/bzImage \
  -append "console=ttyS0 root=/dev/sda earlyprintk=serial net.ifnames=0" \
  -drive file=/home/workdir/stretch.img,format=raw \
  -net user,host=10.0.2.10,hostfwd=tcp:127.0.0.1:10021-:22 \
  -net nic,model=e1000 \
  -enable-kvm \
  -nographic \
  -pidfile vm.pid \
  2>&1 | tee vm.log

If you fix this issue, please add the following tag to the commit:
Reported-by Jiacheng Xu<[email protected]>

             reply	other threads:[~2022-08-30 13:33 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-08-30 13:33 Jiacheng Xu [this message]
2022-08-30 13:58 ` possible deadlock in io_poll_double_wake Jens Axboe
  -- strict thread matches above, loose matches on Subject: below --
2021-10-14  2:45 Hao Sun
2020-08-15 18:09 syzbot
2020-08-15 18:14 ` syzbot
2020-08-15 18:14 ` Jens Axboe
2020-08-15 18:15 ` Jens Axboe

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=CAO4S-me0tq289wabwsL4xbRXfHgaetqvExt8+ZyrKLxfGzLteA@mail.gmail.com \
    [email protected] \
    [email protected] \
    [email protected] \
    [email protected] \
    [email protected] \
    [email protected] \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox