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From: Hillf Danton <hdanton@sina.com>
To: syzbot <syzbot+55cd5225f71c5cff7f6f@syzkaller.appspotmail.com>
Cc: johan.hedberg@gmail.com,
	linux-bluetooth@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	luiz.dentz@gmail.com,
	marcel@holtmann.org,
	Takashi Iwai <tiwai@suse.de>,
	Nicolai Stange <nstange@suse.de>,
	syzkaller-bugs@googlegroups.com
Subject: [syzbot] [bluetooth?] BUG: sleeping function called from invalid context in lock_sock_nested (3)
Date: Tue, 14 May 2024 07:26:52 +0800
Message-Id: <20240513232652.3080-1-hdanton@sina.com>
In-Reply-To: <0000000000009f2fe006185570d8@google.com>
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On Mon, 13 May 2024 05:58:21 -0700
> syzbot found the following issue on:
> 
> HEAD commit:    1c9135d29e9e Merge branch 'for-next/core' into for-kernelci
> git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
> console output: https://syzkaller.appspot.com/x/log.txt?x=10df1ea8980000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=7d2d53e64c7e6a4f
> dashboard link: https://syzkaller.appspot.com/bug?extid=55cd5225f71c5cff7f6f
> compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> userspace arch: arm64
> 
> Unfortunately, I don't have any reproducer for this issue yet.
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/52dd1b4921ab/disk-1c9135d2.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/1a4f1788dc25/vmlinux-1c9135d2.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/b8d8ebd42a80/Image-1c9135d2.gz.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+55cd5225f71c5cff7f6f@syzkaller.appspotmail.com
> 
> BUG: sleeping function called from invalid context at net/core/sock.c:3537
> in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 6274, name: kworker/u9:3
> preempt_count: 1, expected: 0
> RCU nest depth: 0, expected: 0
> 6 locks held by kworker/u9:3/6274:
>  #0: ffff0000d8c79948 ((wq_completion)hci0#2){+.+.}-{0:0}, at: process_one_work+0x668/0x15d4 kernel/workqueue.c:3241
>  #1: ffff8000a9cb7c20 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work+0x6b4/0x15d4 kernel/workqueue.c:3241
>  #2: ffff0000e8294078 (&hdev->lock){+.+.}-{3:3}, at: hci_sync_conn_complete_evt+0xa4/0x870 net/bluetooth/hci_event.c:5061
>  #3: ffff800091d51708 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:2010 [inline]
>  #3: ffff800091d51708 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_sync_conn_complete_evt+0x3d4/0x870 net/bluetooth/hci_event.c:5144
>  #4: ffff0000d0bf4420 (&conn->lock#2){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
>  #4: ffff0000d0bf4420 (&conn->lock#2){+.+.}-{2:2}, at: sco_conn_ready net/bluetooth/sco.c:1273 [inline]
>  #4: ffff0000d0bf4420 (&conn->lock#2){+.+.}-{2:2}, at: sco_connect_cfm+0x260/0x94c net/bluetooth/sco.c:1358
>  #5: ffff0000cd046258 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1673 [inline]
>  #5: ffff0000cd046258 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: sco_conn_ready net/bluetooth/sco.c:1286 [inline]
>  #5: ffff0000cd046258 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: sco_connect_cfm+0x3e8/0x94c net/bluetooth/sco.c:1358
> Preemption disabled at:
> [<ffff80008a0d70d4>] spin_lock include/linux/spinlock.h:351 [inline]
> [<ffff80008a0d70d4>] sco_conn_ready net/bluetooth/sco.c:1273 [inline]
> [<ffff80008a0d70d4>] sco_connect_cfm+0x260/0x94c net/bluetooth/sco.c:1358

A known issue in 2021 [1]

[1] Subject: Possible sleep-in-atomic in BT SCO code
https://lore.kernel.org/lkml/s5hilz8n1an.wl-tiwai@suse.de/

> CPU: 0 PID: 6274 Comm: kworker/u9:3 Not tainted 6.9.0-rc7-syzkaller-g1c9135d29e9e #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
> Workqueue: hci0 hci_rx_work
> Call trace:
>  dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:317
>  show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:324
>  __dump_stack lib/dump_stack.c:88 [inline]
>  dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:114
>  dump_stack+0x1c/0x28 lib/dump_stack.c:123
>  __might_resched+0x374/0x4d0 kernel/sched/core.c:10197
>  __might_sleep+0x90/0xe4 kernel/sched/core.c:10126
>  lock_sock_nested+0x6c/0x11c net/core/sock.c:3537
>  lock_sock include/net/sock.h:1673 [inline]
>  sco_conn_ready net/bluetooth/sco.c:1286 [inline]
>  sco_connect_cfm+0x3e8/0x94c net/bluetooth/sco.c:1358
>  hci_connect_cfm include/net/bluetooth/hci_core.h:2013 [inline]
>  hci_sync_conn_complete_evt+0x438/0x870 net/bluetooth/hci_event.c:5144
>  hci_event_func net/bluetooth/hci_event.c:7545 [inline]
>  hci_event_packet+0x740/0x1098 net/bluetooth/hci_event.c:7597
>  hci_rx_work+0x318/0xa78 net/bluetooth/hci_core.c:4171
>  process_one_work+0x7b8/0x15d4 kernel/workqueue.c:3267
>  process_scheduled_works kernel/workqueue.c:3348 [inline]
>  worker_thread+0x938/0xef4 kernel/workqueue.c:3429
>  kthread+0x288/0x310 kernel/kthread.c:388
>  ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860
> Bluetooth: hci0: command tx timeout
> 
> 
> ---
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