syzbot


WARNING: ODEBUG bug in bt_host_release

Status: upstream: reported on 2025/11/13 08:36
Reported-by: syzbot+5e2d7111f84f8ec4b492@syzkaller.appspotmail.com
First crash: 5d00h, last: 1d18h
Similar bugs (4)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 WARNING: ODEBUG bug in bt_host_release -1 1 28d 28d 0/3 upstream: reported on 2025/10/21 01:07
upstream WARNING: ODEBUG bug in bt_host_release bluetooth -1 syz done done 7 1680d 1933d 22/29 fixed on 2022/09/20 07:46
linux-4.19 WARNING: ODEBUG bug in bt_host_release -1 1 1741d 1741d 0/1 auto-closed as invalid on 2021/06/11 00:58
linux-4.14 WARNING: ODEBUG bug in bt_host_release -1 syz error 2 1358d 1913d 0/1 upstream: reported syz repro on 2020/08/22 10:22

Sample crash report:
Bluetooth: hci3: Opcode 0x0c20 failed: -4
------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff8880596d49c0 object type: timer_list hint: hci_cmd_timeout+0x0/0x1e0
WARNING: CPU: 0 PID: 10108 at lib/debugobjects.c:518 debug_print_object lib/debugobjects.c:515 [inline]
WARNING: CPU: 0 PID: 10108 at lib/debugobjects.c:518 __debug_check_no_obj_freed lib/debugobjects.c:990 [inline]
WARNING: CPU: 0 PID: 10108 at lib/debugobjects.c:518 debug_check_no_obj_freed+0x446/0x540 lib/debugobjects.c:1020
Modules linked in:
CPU: 0 PID: 10108 Comm: syz.1.1094 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:debug_print_object lib/debugobjects.c:515 [inline]
RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:990 [inline]
RIP: 0010:debug_check_no_obj_freed+0x446/0x540 lib/debugobjects.c:1020
Code: 4c 8b 4d 00 48 c7 c7 c0 74 fc 8a 48 c7 c6 20 71 fc 8a 48 c7 c2 40 76 fc 8a 8b 0c 24 4d 89 f8 41 55 e8 6e dd 29 fd 48 83 c4 08 <0f> 0b 4c 8b 6c 24 18 48 b9 00 00 00 00 00 fc ff df ff 05 a3 92 24
RSP: 0018:ffffc90003d17a38 EFLAGS: 00010282
RAX: cdf9b19e1fb3c900 RBX: ffffffff97139660 RCX: 0000000000080000
RDX: ffffc9000d47a000 RSI: 000000000000c78e RDI: 000000000000c78f
RBP: ffffffff8aac9f00 R08: ffffc90003d17627 R09: 1ffff920007a2ec4
R10: dffffc0000000000 R11: fffff520007a2ec5 R12: ffff8880596d6000
R13: ffffffff89702a60 R14: ffff8880596d4000 R15: ffff8880596d49c0
FS:  00007ff79f58f6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f75ac298f98 CR3: 0000000065704000 CR4: 00000000003506f0
DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000083
DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 slab_free_hook mm/slub.c:1786 [inline]
 slab_free_freelist_hook+0xd2/0x1b0 mm/slub.c:1837
 slab_free mm/slub.c:3830 [inline]
 __kmem_cache_free+0xba/0x1f0 mm/slub.c:3843
 bt_host_release+0x82/0x90 net/bluetooth/hci_sysfs.c:87
 device_release+0x96/0x1c0 drivers/base/core.c:-1
 kobject_cleanup lib/kobject.c:689 [inline]
 kobject_release lib/kobject.c:720 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x221/0x470 lib/kobject.c:737
 hci_dev_put include/net/bluetooth/hci_core.h:1610 [inline]
 hci_dev_cmd+0x213/0x7b0 net/bluetooth/hci_core.c:803
 sock_do_ioctl+0xd7/0x2f0 net/socket.c:1222
 sock_ioctl+0x623/0x7a0 net/socket.c:1341
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:871 [inline]
 __se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7ff79e78f6c9
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:00007ff79f58f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ff79e9e5fa0 RCX: 00007ff79e78f6c9
RDX: 0000200000000200 RSI: 00000000400448de RDI: 0000000000000007
RBP: 00007ff79e811f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff79e9e6038 R14: 00007ff79e9e5fa0 R15: 00007fffdebde2f8
 </TASK>

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/11/16 14:23 linux-6.6.y 0a805b6ea8cd f7988ea4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING: ODEBUG bug in bt_host_release
2025/11/13 08:35 linux-6.6.y 0a805b6ea8cd 07e030de .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING: ODEBUG bug in bt_host_release
* Struck through repros no longer work on HEAD.