linux-kernel - [syzbot] BUG: corrupted list in kref

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Message-ID: <000000000000c0ee8705e8ed7e7e@google.com>
Date:   Sat, 17 Sep 2022 23:13:35 -0700
From:   syzbot <syzbot+e07ad07cb2283bc5bf57@...kaller.appspotmail.com>
To:     gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        rafael@...nel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] BUG: corrupted list in kref_put

Hello,

syzbot found the following issue on:

HEAD commit:    a6b443748715 Merge branch 'for-next/core', remote-tracking..
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=104c56a0880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=14bf9ec0df433b27
dashboard link: https://syzkaller.appspot.com/bug?extid=e07ad07cb2283bc5bf57
compiler:       Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: arm64

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

Downloadable assets:
disk image: https://storage.googleapis.com/81b491dd5861/disk-a6b44374.raw.xz
vmlinux: https://storage.googleapis.com/69c979cdc99a/vmlinux-a6b44374.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e07ad07cb2283bc5bf57@...kaller.appspotmail.com

list_del corruption. prev->next should be ffff0000c953d4c8, but was 0000000000000000. (prev=ffff0000fc3536c8)
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:61!
Internal error: Oops - BUG: 0 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 44 Comm: kworker/u5:0 Not tainted 6.0.0-rc4-syzkaller-17255-ga6b443748715 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
Workqueue: hci5 hci_error_reset
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : __list_del_entry_valid+0xbc/0xd0 lib/list_debug.c:59
lr : __list_del_entry_valid+0xbc/0xd0 lib/list_debug.c:59
sp : ffff80000f683b10
x29: ffff80000f683b10 x28: ffff80000d2bb000 x27: ffff0000c6e49c25
x26: 0000000000000000 x25: 0000000000000000 x24: ffff0000c0dec980
x23: ffff0000c0d93500 x22: ffff800009a56428 x21: ffff0000c0f30149
x20: ffff0000c953d4c0 x19: ffff0000c953d4d8 x18: 00000000000000c0
x17: 20747562202c3863 x16: ffff80000db78658 x15: ffff0000c0d93500
x14: 0000000000000000 x13: 00000000ffffffff x12: ffff0000c0d93500
x11: ff808000081c1fa0 x10: 0000000000000000 x9 : 74f127b5afecc300
x8 : 74f127b5afecc300 x7 : ffff8000081965e0 x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000
x2 : ffff0001fefddcd0 x1 : 0000000100000001 x0 : 000000000000006d
Call trace:
 __list_del_entry_valid+0xbc/0xd0 lib/list_debug.c:59
 __list_del_entry include/linux/list.h:134 [inline]
 list_del include/linux/list.h:148 [inline]
 klist_release lib/klist.c:189 [inline]
 kref_put+0x6c/0x1d0 include/linux/kref.h:65
 klist_dec_and_del lib/klist.c:206 [inline]
 klist_put lib/klist.c:217 [inline]
 klist_del+0x58/0xb0 lib/klist.c:230
 device_del+0x280/0x5bc drivers/base/core.c:3699
 hci_conn_del_sysfs+0xb0/0xfc net/bluetooth/hci_sysfs.c:78
 hci_conn_cleanup+0x2d4/0x380 net/bluetooth/hci_conn.c:147
 hci_conn_del+0x144/0x2a8 net/bluetooth/hci_conn.c:1022
 hci_conn_hash_flush+0xe8/0x148 net/bluetooth/hci_conn.c:2367
 hci_dev_close_sync+0x48c/0x9e0 net/bluetooth/hci_sync.c:4476
 hci_dev_do_close net/bluetooth/hci_core.c:554 [inline]
 hci_error_reset+0xac/0x154 net/bluetooth/hci_core.c:1050
 process_one_work+0x2d8/0x504 kernel/workqueue.c:2289
 worker_thread+0x340/0x610 kernel/workqueue.c:2436
 kthread+0x12c/0x158 kernel/kthread.c:376
 ret_from_fork+0x10/0x20
Code: d001b4a0 91365000 aa0803e3 94a7897a (d4210000) 
---[ end trace 0000000000000000 ]---


---
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