Subject: Re: [syzbot] [bluetooth?] WARNING: ODEBUG bug in hci_release_dev (2)

From: syzbot <[email-masked]>
Date: Mon, 14 Oct 2024 16:11:23 -0700

syzbot has found a reproducer for the following issue on:

HEAD commit:    0b84db5d8f25 MAINTAINERS: add Andrew Lunn as a co-maintain..
git tree:       net
console output: https://syzkaller.appspot.com/x/log.txt?x=10505727980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=7cd9e7e4a8a0a15b
dashboard link: https://syzkaller.appspot.com/bug?extid=b170dbf55520ebf5969a
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16f84030580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/bd00feb30432/disk-0b84db5d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/e39e30a1ae6d/vmlinux-0b84db5d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/87eafcdafd48/bzImage-0b84db5d.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: [email-masked]

------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff88806c380978 object type: timer_list hint: hci_cmd_timeout+0x0/0x1e0
WARNING: CPU: 1 PID: 11255 at lib/debugobjects.c:517 debug_print_object+0x17a/0x1f0 lib/debugobjects.c:514
Modules linked in:
CPU: 1 UID: 0 PID: 11255 Comm: syz.1.2889 Not tainted 6.12.0-rc2-syzkaller-00216-g0b84db5d8f25 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:debug_print_object+0x17a/0x1f0 lib/debugobjects.c:514
Code: e8 5b 1a 3c fd 4c 8b 0b 48 c7 c7 e0 04 61 8c 48 8b 74 24 08 48 89 ea 44 89 e1 4d 89 f8 ff 34 24 e8 db 63 93 fc 48 83 c4 08 90 <0f> 0b 90 90 ff 05 64 a7 5a 0b 48 83 c4 10 5b 41 5c 41 5d 41 5e 41
RSP: 0018:ffffc90003e17818 EFLAGS: 00010286
RAX: b20dce31d0d23300 RBX: ffffffff8c0cd900 RCX: ffff88807aa40000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffffff8c610660 R08: ffffffff8155e402 R09: fffffbfff1cf9fd8
R10: dffffc0000000000 R11: fffffbfff1cf9fd8 R12: 0000000000000000
R13: ffffffff8c610578 R14: dffffc0000000000 R15: ffff88806c380978
FS:  00007fd4093cf6c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f55ce736000 CR3: 0000000074a94000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __debug_check_no_obj_freed lib/debugobjects.c:989 [inline]
 debug_check_no_obj_freed+0x45b/0x580 lib/debugobjects.c:1019
 slab_free_hook mm/slub.c:2273 [inline]
 slab_free mm/slub.c:4579 [inline]
 kfree+0x11f/0x440 mm/slub.c:4727
 hci_release_dev+0x1525/0x16b0 net/bluetooth/hci_core.c:2759
 bt_host_release+0x83/0x90 net/bluetooth/hci_sysfs.c:94
 device_release+0x99/0x1c0
 kobject_cleanup lib/kobject.c:689 [inline]
 kobject_release lib/kobject.c:720 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x22f/0x480 lib/kobject.c:737
 hci_dev_put include/net/bluetooth/hci_core.h:1581 [inline]
 hci_dev_cmd+0x296/0xa50 net/bluetooth/hci_core.c:763
 sock_do_ioctl+0x158/0x460 net/socket.c:1227
 sock_ioctl+0x626/0x8e0 net/socket.c:1346
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd40857dff9
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:00007fd4093cf038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fd408735f80 RCX: 00007fd40857dff9
RDX: 0000000020000240 RSI: 00000000400448dd RDI: 0000000000000004
RBP: 00007fd4085f0296 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fd408735f80 R15: 00007ffd5284c118
 </TASK>

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