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AJvYcCV2Q1X/E7EFaIYryiFRznQ7G2cgS5vqvofZy0Jif0FBEyJoojUgPh/WIzi9HpxiCb9b3hnkwTQiJ3URyTY=@vger.kernel.org X-Gm-Message-State: AOJu0YxEokM29y3X6Rgy3UwLcqaANlyMLexraZDxmZz5eRrEh5WwwNqi Y/paPgZlo0xPaFPCNZ3rMD12l5A27DCPttWOVbaT1c6Kl9qvZr5pCClARxxi0p+1gdhh6pOmp5/ B8tjdIsLeCE3Zfd+S9cxJNaLArdHkXRP1H4TXZo+KunLEusLCJjAYMvkRVxk= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:f011:b0:67b:bd6e:80d2 with SMTP id 006d021491bc7-67bdaa8cbc6mr9405289eaf.72.1773678241516; Mon, 16 Mar 2026 09:24:01 -0700 (PDT) Date: Mon, 16 Mar 2026 09:24:01 -0700 In-Reply-To: <20260316160751.297206-1-abysamross@gmail.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69b82ea1.050a0220.12d28.0164.GAE@google.com> Subject: Re: [syzbot] [bluetooth?] WARNING: ODEBUG bug in hci_release_dev (2) From: syzbot To: abysamross@gmail.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" 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: __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 ---------------- 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.