Re: [syzbot] [bluetooth?] WARNING: ODEBUG bug in hci_release_dev (2)
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syzbot
Mar 16, 2026, 12:24:04 PM (7 days ago) Mar 16
to abysa...@gmail.com, linux-...@vger.kernel.org, syzkall...@googlegroups.com
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING: ODEBUG bug in hci_release_dev
------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff88807ea79460 object type: timer_list hint: hci_devcd_timeout+0x0/0x2e0 net/bluetooth/coredump.c:288
WARNING: lib/debugobjects.c:629 at debug_print_object+0x18e/0x2a0 lib/debugobjects.c:629, CPU#0: syz.4.25/6752
Modules linked in:
CPU: 0 UID: 0 PID: 6752 Comm: syz.4.25 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:debug_print_object+0x19b/0x2a0 lib/debugobjects.c:629
Code: b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 4f 48 8d 3d 32 a5 b9 0b 41 56 48 8b 14 dd 00 c5 13 8c 4c 89 e6 <67> 48 0f b9 3a 58 83 05 2c 48 af 0b 01 48 83 c4 18 5b 5d 41 5c 41
RSP: 0018:ffffc90003877708 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000003 RCX: 0000000000000000
RDX: ffffffff8c13c440 RSI: ffffffff8c13c060 RDI: ffffffff90b567e0
RBP: 0000000000000001 R08: ffff88807ea79460 R09: ffffffff8bb07a00
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8c13c060
R13: ffffffff8bb07a40 R14: ffffffff8a8eae60 R15: ffffc90003877808
FS: 0000000000000000(0000) GS:ffff888124683000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdb9c7497d9 CR3: 00000000372c4000 CR4: 00000000003526f0
Call Trace:
<TASK>
__debug_check_no_obj_freed lib/debugobjects.c:1116 [inline]
debug_check_no_obj_freed+0x4da/0x630 lib/debugobjects.c:1146
__free_pages_prepare mm/page_alloc.c:1440 [inline]
__free_frozen_pages+0x392/0x10d0 mm/page_alloc.c:2978
hci_release_dev+0x4ef/0x630 net/bluetooth/hci_core.c:2777
bt_host_release+0x6a/0xb0 net/bluetooth/hci_sysfs.c:87
device_release+0xa4/0x240 drivers/base/core.c:2565
kobject_cleanup lib/kobject.c:689 [inline]
kobject_release lib/kobject.c:720 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x1f7/0x640 lib/kobject.c:737
put_device+0x1f/0x30 drivers/base/core.c:3797
vhci_release+0x185/0x230 drivers/bluetooth/hci_vhci.c:691
__fput+0x3ff/0xb40 fs/file_table.c:469
task_work_run+0x150/0x240 kernel/task_work.c:233
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0x8b8/0x2b60 kernel/exit.c:976
do_group_exit+0xd5/0x2a0 kernel/exit.c:1118
get_signal+0x1ec7/0x21e0 kernel/signal.c:3034
arch_do_signal_or_restart+0x91/0x770 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
exit_to_user_mode_loop+0x86/0x4a0 kernel/entry/common.c:98
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline]
do_syscall_64+0x668/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc71939a379
Code: Unable to access opcode bytes at 0x7fc71939a34f.
RSP: 002b:00007fc71a1760e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00007fc7195e5fa8 RCX: 00007fc71939a379
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fc7195e5fac
RBP: 00007fc7195e5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc7195e6038 R14: 00007ffef7196040 R15: 00007ffef7196128
</TASK>
----------------
Code disassembly (best guess):
0: b8 00 00 00 00 mov $0x0,%eax
5: 00 fc add %bh,%ah
7: ff lcall (bad)
8: df 48 89 fisttps -0x77(%rax)
b: fa cli
c: 48 c1 ea 03 shr $0x3,%rdx
10: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
14: 75 4f jne 0x65
16: 48 8d 3d 32 a5 b9 0b lea 0xbb9a532(%rip),%rdi # 0xbb9a54f
1d: 41 56 push %r14
1f: 48 8b 14 dd 00 c5 13 mov -0x73ec3b00(,%rbx,8),%rdx
26: 8c
27: 4c 89 e6 mov %r12,%rsi
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: 58 pop %rax
30: 83 05 2c 48 af 0b 01 addl $0x1,0xbaf482c(%rip) # 0xbaf4863
37: 48 83 c4 18 add $0x18,%rsp
3b: 5b pop %rbx
3c: 5d pop %rbp
3d: 41 5c pop %r12
3f: 41 rex.B
Tested on:
commit: f338e773 Linux 7.0-rc4
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16ce78da580000
kernel config: https://syzkaller.appspot.com/x/.config?x=6f764aea3bbb63e1
dashboard link: https://syzkaller.appspot.com/bug?extid=b170dbf55520ebf5969a
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
Note: no patches were applied.
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING: ODEBUG bug in hci_release_dev
------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff88807ea79460 object type: timer_list hint: hci_devcd_timeout+0x0/0x2e0 net/bluetooth/coredump.c:288
WARNING: lib/debugobjects.c:629 at debug_print_object+0x18e/0x2a0 lib/debugobjects.c:629, CPU#0: syz.4.25/6752
Modules linked in:
CPU: 0 UID: 0 PID: 6752 Comm: syz.4.25 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:debug_print_object+0x19b/0x2a0 lib/debugobjects.c:629
Code: b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 4f 48 8d 3d 32 a5 b9 0b 41 56 48 8b 14 dd 00 c5 13 8c 4c 89 e6 <67> 48 0f b9 3a 58 83 05 2c 48 af 0b 01 48 83 c4 18 5b 5d 41 5c 41
RSP: 0018:ffffc90003877708 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000003 RCX: 0000000000000000
RDX: ffffffff8c13c440 RSI: ffffffff8c13c060 RDI: ffffffff90b567e0
RBP: 0000000000000001 R08: ffff88807ea79460 R09: ffffffff8bb07a00
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8c13c060
R13: ffffffff8bb07a40 R14: ffffffff8a8eae60 R15: ffffc90003877808
FS: 0000000000000000(0000) GS:ffff888124683000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdb9c7497d9 CR3: 00000000372c4000 CR4: 00000000003526f0
Call Trace:
<TASK>
__debug_check_no_obj_freed lib/debugobjects.c:1116 [inline]
debug_check_no_obj_freed+0x4da/0x630 lib/debugobjects.c:1146
__free_pages_prepare mm/page_alloc.c:1440 [inline]
__free_frozen_pages+0x392/0x10d0 mm/page_alloc.c:2978
hci_release_dev+0x4ef/0x630 net/bluetooth/hci_core.c:2777
bt_host_release+0x6a/0xb0 net/bluetooth/hci_sysfs.c:87
device_release+0xa4/0x240 drivers/base/core.c:2565
kobject_cleanup lib/kobject.c:689 [inline]
kobject_release lib/kobject.c:720 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x1f7/0x640 lib/kobject.c:737
put_device+0x1f/0x30 drivers/base/core.c:3797
vhci_release+0x185/0x230 drivers/bluetooth/hci_vhci.c:691
__fput+0x3ff/0xb40 fs/file_table.c:469
task_work_run+0x150/0x240 kernel/task_work.c:233
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0x8b8/0x2b60 kernel/exit.c:976
do_group_exit+0xd5/0x2a0 kernel/exit.c:1118
get_signal+0x1ec7/0x21e0 kernel/signal.c:3034
arch_do_signal_or_restart+0x91/0x770 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
exit_to_user_mode_loop+0x86/0x4a0 kernel/entry/common.c:98
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline]
do_syscall_64+0x668/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc71939a379
Code: Unable to access opcode bytes at 0x7fc71939a34f.
RSP: 002b:00007fc71a1760e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00007fc7195e5fa8 RCX: 00007fc71939a379
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fc7195e5fac
RBP: 00007fc7195e5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc7195e6038 R14: 00007ffef7196040 R15: 00007ffef7196128
</TASK>
----------------
Code disassembly (best guess):
0: b8 00 00 00 00 mov $0x0,%eax
5: 00 fc add %bh,%ah
7: ff lcall (bad)
8: df 48 89 fisttps -0x77(%rax)
b: fa cli
c: 48 c1 ea 03 shr $0x3,%rdx
10: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
14: 75 4f jne 0x65
16: 48 8d 3d 32 a5 b9 0b lea 0xbb9a532(%rip),%rdi # 0xbb9a54f
1d: 41 56 push %r14
1f: 48 8b 14 dd 00 c5 13 mov -0x73ec3b00(,%rbx,8),%rdx
26: 8c
27: 4c 89 e6 mov %r12,%rsi
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: 58 pop %rax
30: 83 05 2c 48 af 0b 01 addl $0x1,0xbaf482c(%rip) # 0xbaf4863
37: 48 83 c4 18 add $0x18,%rsp
3b: 5b pop %rbx
3c: 5d pop %rbp
3d: 41 5c pop %r12
3f: 41 rex.B
Tested on:
commit: f338e773 Linux 7.0-rc4
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16ce78da580000
kernel config: https://syzkaller.appspot.com/x/.config?x=6f764aea3bbb63e1
dashboard link: https://syzkaller.appspot.com/bug?extid=b170dbf55520ebf5969a
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
Note: no patches were applied.
syzbot
Mar 17, 2026, 11:34:04 AM (6 days ago) Mar 17
to abysa...@gmail.com, linux-...@vger.kernel.org, syzkall...@googlegroups.com
Hello,
syzbot has tested the proposed patch and the reproducer did not trigger any issue:
Reported-by: syzbot+b170db...@syzkaller.appspotmail.com
Tested-by: syzbot+b170db...@syzkaller.appspotmail.com
Tested on:
commit: 2d1373e4 Merge tag 'for-7.0-rc4-tag' of git://git.kern..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1130e2d6580000
Note: testing is done by a robot and is best-effort only.
syzbot has tested the proposed patch and the reproducer did not trigger any issue:
Reported-by: syzbot+b170db...@syzkaller.appspotmail.com
Tested-by: syzbot+b170db...@syzkaller.appspotmail.com
Tested on:
commit: 2d1373e4 Merge tag 'for-7.0-rc4-tag' of git://git.kern..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1130e2d6580000
kernel config: https://syzkaller.appspot.com/x/.config?x=6f764aea3bbb63e1
dashboard link: https://syzkaller.appspot.com/bug?extid=b170dbf55520ebf5969a
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
patch: https://syzkaller.appspot.com/x/patch.diff?x=17fea8da580000
dashboard link: https://syzkaller.appspot.com/bug?extid=b170dbf55520ebf5969a
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
Note: testing is done by a robot and is best-effort only.
syzbot
Mar 21, 2026, 7:05:05 AM (2 days ago) Mar 21
to abysa...@gmail.com, linux-...@vger.kernel.org, syzkall...@googlegroups.com
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING: ODEBUG bug in hci_release_dev
------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff8880603c9460 object type: timer_list hint: hci_devcd_timeout+0x0/0x2e0 net/bluetooth/coredump.c:288
WARNING: lib/debugobjects.c:629 at debug_print_object+0x18e/0x2a0 lib/debugobjects.c:629, CPU#0: syz.2.21/6604
Modules linked in:
CPU: 0 UID: 0 PID: 6604 Comm: syz.2.21 Not tainted syzkaller #0 PREEMPT(full)
RSP: 0018:ffffc90003147708 EFLAGS: 00010246
RBP: 0000000000000001 R08: ffff8880603c9460 R09: ffffffff8bb07a00
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8c13c3e0
R13: ffffffff8bb07a40 R14: ffffffff8a8eca20 R15: ffffc90003147808
FS: 0000000000000000(0000) GS:ffff888124680000(0000) knlGS:0000000000000000
RIP: 0033:0x7fcff159a379
Code: Unable to access opcode bytes at 0x7fcff159a34f.
RSP: 002b:00007fcff24b80e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00007fcff17e5fa8 RCX: 00007fcff159a379
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fcff17e5fac
RBP: 00007fcff17e5fa0 R08: 0000000000000000 R09: 0000000000000000
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17f1d0ca580000
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING: ODEBUG bug in hci_release_dev
------------[ cut here ]------------
WARNING: lib/debugobjects.c:629 at debug_print_object+0x18e/0x2a0 lib/debugobjects.c:629, CPU#0: syz.2.21/6604
Modules linked in:
CPU: 0 UID: 0 PID: 6604 Comm: syz.2.21 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:debug_print_object+0x19b/0x2a0 lib/debugobjects.c:629
Code: b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 4f 48 8d 3d 82 9b b9 0b 41 56 48 8b 14 dd 80 c8 13 8c 4c 89 e6 <67> 48 0f b9 3a 58 83 05 ac 3d af 0b 01 48 83 c4 18 5b 5d 41 5c 41
RIP: 0010:debug_print_object+0x19b/0x2a0 lib/debugobjects.c:629
RSP: 0018:ffffc90003147708 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000003 RCX: 0000000000000000
RDX: ffffffff8c13c7c0 RSI: ffffffff8c13c3e0 RDI: ffffffff90b575b0
RBP: 0000000000000001 R08: ffff8880603c9460 R09: ffffffff8bb07a00
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8c13c3e0
R13: ffffffff8bb07a40 R14: ffffffff8a8eca20 R15: ffffc90003147808
FS: 0000000000000000(0000) GS:ffff888124680000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f871e8d1140 CR3: 000000002be6c000 CR4: 00000000003526f0
Code: Unable to access opcode bytes at 0x7fcff159a34f.
RSP: 002b:00007fcff24b80e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00007fcff17e5fa8 RCX: 00007fcff159a379
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fcff17e5fac
RBP: 00007fcff17e5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcff17e6038 R14: 00007ffef3a4d530 R15: 00007ffef3a4d618
</TASK>
----------------
Code disassembly (best guess):
0: b8 00 00 00 00 mov $0x0,%eax
5: 00 fc add %bh,%ah
7: ff lcall (bad)
8: df 48 89 fisttps -0x77(%rax)
b: fa cli
c: 48 c1 ea 03 shr $0x3,%rdx
10: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
14: 75 4f jne 0x65
16: 48 8d 3d 82 9b b9 0b lea 0xbb99b82(%rip),%rdi # 0xbb99b9f
----------------
Code disassembly (best guess):
0: b8 00 00 00 00 mov $0x0,%eax
5: 00 fc add %bh,%ah
7: ff lcall (bad)
8: df 48 89 fisttps -0x77(%rax)
b: fa cli
c: 48 c1 ea 03 shr $0x3,%rdx
10: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
14: 75 4f jne 0x65
1d: 41 56 push %r14
1f: 48 8b 14 dd 80 c8 13 mov -0x73ec3780(,%rbx,8),%rdx
26: 8c
27: 4c 89 e6 mov %r12,%rsi
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: 58 pop %rax
30: 83 05 ac 3d af 0b 01 addl $0x1,0xbaf3dac(%rip) # 0xbaf3de3
27: 4c 89 e6 mov %r12,%rsi
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: 58 pop %rax
37: 48 83 c4 18 add $0x18,%rsp
3b: 5b pop %rbx
3c: 5d pop %rbp
3d: 41 5c pop %r12
3f: 41 rex.B
Tested on:
commit: a0c83177 Merge tag 'drm-fixes-2026-03-21' of https://g..
3b: 5b pop %rbx
3c: 5d pop %rbp
3d: 41 5c pop %r12
3f: 41 rex.B
Tested on:
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17f1d0ca580000
kernel config: https://syzkaller.appspot.com/x/.config?x=6f764aea3bbb63e1
dashboard link: https://syzkaller.appspot.com/bug?extid=b170dbf55520ebf5969a
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
dashboard link: https://syzkaller.appspot.com/bug?extid=b170dbf55520ebf5969a
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
syzbot
Mar 21, 2026, 7:50:03 AM (2 days ago) Mar 21
to abysa...@gmail.com, linux-...@vger.kernel.org, syzkall...@googlegroups.com
Hello,
syzbot has tested the proposed patch and the reproducer did not trigger any issue:
Reported-by: syzbot+b170db...@syzkaller.appspotmail.com
Tested-by: syzbot+b170db...@syzkaller.appspotmail.com
console output: https://syzkaller.appspot.com/x/log.txt?x=11ea66da580000
syzbot has tested the proposed patch and the reproducer did not trigger any issue:
Reported-by: syzbot+b170db...@syzkaller.appspotmail.com
Tested-by: syzbot+b170db...@syzkaller.appspotmail.com
kernel config: https://syzkaller.appspot.com/x/.config?x=6f764aea3bbb63e1
dashboard link: https://syzkaller.appspot.com/bug?extid=b170dbf55520ebf5969a
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
patch: https://syzkaller.appspot.com/x/patch.diff?x=10b01e16580000
dashboard link: https://syzkaller.appspot.com/bug?extid=b170dbf55520ebf5969a
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
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