linux-kernel - [syzbot] [bluetooth?] WARNING in hci_devcd

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Message-ID: <677a314a.050a0220.380ff0.000b.GAE@google.com>
Date: Sat, 04 Jan 2025 23:14:18 -0800
From: syzbot <syzbot+7540c87aab2f3a5cef91@...kaller.appspotmail.com>
To: johan.hedberg@...il.com, linux-bluetooth@...r.kernel.org, 
	linux-kernel@...r.kernel.org, luiz.dentz@...il.com, marcel@...tmann.org, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [bluetooth?] WARNING in hci_devcd_register

Hello,

syzbot found the following issue on:

HEAD commit:    ccb98ccef0e5 Merge tag 'platform-drivers-x86-v6.13-4' of g..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13255af8580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=86dd15278dbfe19f
dashboard link: https://syzkaller.appspot.com/bug?extid=7540c87aab2f3a5cef91
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/d24eb225cff7/disk-ccb98cce.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/dd81532f8240/vmlinux-ccb98cce.xz
kernel image: https://storage.googleapis.com/syzbot-assets/18b08e4bbf40/bzImage-ccb98cce.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+7540c87aab2f3a5cef91@...kaller.appspotmail.com

------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(lock->magic != lock)
WARNING: CPU: 1 PID: 10888 at kernel/locking/mutex.c:564 __mutex_lock_common kernel/locking/mutex.c:564 [inline]
WARNING: CPU: 1 PID: 10888 at kernel/locking/mutex.c:564 __mutex_lock+0x369/0xa60 kernel/locking/mutex.c:735
Modules linked in:
CPU: 1 UID: 0 PID: 10888 Comm: syz.7.1098 Not tainted 6.13.0-rc5-syzkaller-00004-gccb98ccef0e5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:564 [inline]
RIP: 0010:__mutex_lock+0x369/0xa60 kernel/locking/mutex.c:735
Code: d0 7c 08 84 d2 0f 85 6d 06 00 00 8b 0d 50 4f 01 05 85 c9 75 19 90 48 c7 c6 60 be 4c 8b 48 c7 c7 c0 bc 4c 8b e8 d8 4c 3e f6 90 <0f> 0b 90 90 90 e9 f2 fd ff ff 4c 8d b5 60 ff ff ff 48 89 df 4c 89
RSP: 0018:ffffc900180cfa80 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff8880120c7098 RCX: ffffffff815a1789
RDX: ffff88803156bc00 RSI: ffffffff815a1796 RDI: 0000000000000001
RBP: ffffc900180cfbc0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000
R13: 0000000000000002 R14: 0000000000000000 R15: ffffc900180cfb00
FS:  00007fa2501526c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3285ffff CR3: 000000003f326000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 hci_devcd_register+0x47/0x170 net/bluetooth/coredump.c:415
 force_devcd_write+0x175/0x350 drivers/bluetooth/hci_vhci.c:346
 full_proxy_write+0xfb/0x1b0 fs/debugfs/file.c:356
 vfs_write+0x24c/0x1150 fs/read_write.c:677
 ksys_write+0x12b/0x250 fs/read_write.c:731
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa24f385d29
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa250152038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fa24f575fa0 RCX: 00007fa24f385d29
RDX: 000000000000000e RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007fa24f401b08 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fa24f575fa0 R15: 00007fff481bce58
 </TASK>


---
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