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AJvYcCWA+DRQeRg2puzXOzX2kB17iBsladRHIp2FDACEI5CJxBfl0of5WF5BPsorEHLbj2n7i4SRVdQQBKuldsIaa4s=@vger.kernel.org X-Gm-Message-State: AOJu0YxzQa4vhAXnLIA4U3D/tKHC3ySTt1QXF8rzkX8h9bHpReMNLhpA eWWZ/xrVseAuJBdFHLg0X++FghmtFiTRpHYoAfsWGz7Ms3TGZwQdzf6Y7l43zOxEoE1fUHfYa03 EIeTpmR+bNXdbXdeieIPusfOCNTKqLbzUnw+wjXhDRwwRyZmB81lRFXVaDzU= Precedence: bulk X-Mailing-List: linux-bluetooth@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:820:b0:662:c5c5:4fac with SMTP id 006d021491bc7-6630f3c4dbcmr2516793eaf.79.1769867428833; Sat, 31 Jan 2026 05:50:28 -0800 (PST) Date: Sat, 31 Jan 2026 05:50:28 -0800 In-Reply-To: <694c9ee9.050a0220.35954c.0030.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <697e08a4.050a0220.16b13.0092.GAE@google.com> Subject: Re: [syzbot] [bluetooth?] WARNING in hci_connect_sco From: syzbot To: johan.hedberg@gmail.com, linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org, luiz.dentz@gmail.com, marcel@holtmann.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: ad9a728a3388 Merge tag 'for-linus-iommufd' of git://git.ke.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15513c5a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=f1fac0919970b671 dashboard link: https://syzkaller.appspot.com/bug?extid=5897b3c764f5989ea942 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17b45322580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-ad9a728a.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/bad71633ff53/vmlinux-ad9a728a.xz kernel image: https://storage.googleapis.com/syzbot-assets/7cac661e37c7/bzImage-ad9a728a.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+5897b3c764f5989ea942@syzkaller.appspotmail.com ------------[ cut here ]------------ workqueue: cannot queue hci_conn_timeout on wq hci1 WARNING: kernel/workqueue.c:2251 at __queue_work+0xcbb/0x10f0 kernel/workqueue.c:2250, CPU#1: syz.0.8416/24058 Modules linked in: CPU: 1 UID: 0 PID: 24058 Comm: syz.0.8416 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:__queue_work+0xcbf/0x10f0 kernel/workqueue.c:2250 Code: 00 00 00 fc ff df 49 8d 94 24 78 01 00 00 48 89 f9 48 c1 e9 03 80 3c 01 00 0f 85 15 04 00 00 48 8d 3d 95 f5 eb 0e 48 8b 75 18 <67> 48 0f b9 3a e9 77 f7 ff ff e8 a2 b0 38 00 90 0f 0b 90 e9 ff f5 RSP: 0018:ffffc90005f2fbf8 EFLAGS: 00010046 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffff11006ee094b RDX: ffff888027001178 RSI: ffffffff8a71b840 RDI: ffffffff90ba4040 RBP: ffff888037704a40 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888027001000 R13: ffff888048858000 R14: ffff888037704a88 R15: ffff888037704a48 FS: 00007fa16e9826c0(0000) GS:ffff8880d66d9000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000000000c0 CR3: 00000000523e6000 CR4: 0000000000352ef0 Call Trace: __queue_delayed_work+0x365/0x470 kernel/workqueue.c:2503 queue_delayed_work_on+0x180/0x1e0 kernel/workqueue.c:2555 queue_delayed_work include/linux/workqueue.h:684 [inline] hci_conn_drop include/net/bluetooth/hci_core.h:1710 [inline] hci_conn_drop include/net/bluetooth/hci_core.h:1684 [inline] hci_connect_sco+0x4d2/0xef0 net/bluetooth/hci_conn.c:1767 sco_connect net/bluetooth/sco.c:339 [inline] sco_sock_connect+0x303/0xcb0 net/bluetooth/sco.c:665 __sys_connect_file+0x141/0x1a0 net/socket.c:2089 __sys_connect+0x141/0x170 net/socket.c:2108 __do_sys_connect net/socket.c:2114 [inline] __se_sys_connect net/socket.c:2111 [inline] __x64_sys_connect+0x72/0xb0 net/socket.c:2111 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa16db9aeb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fa16e982028 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00007fa16de15fa0 RCX: 00007fa16db9aeb9 RDX: 0000000000000008 RSI: 00002000000000c0 RDI: 0000000000000004 RBP: 00007fa16dc08c1f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa16de16038 R14: 00007fa16de15fa0 R15: 00007ffcb1740998 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 00 fc add %bh,%ah 4: ff lcall (bad) 5: df 49 8d fisttps -0x73(%rcx) 8: 94 xchg %eax,%esp 9: 24 78 and $0x78,%al b: 01 00 add %eax,(%rax) d: 00 48 89 add %cl,-0x77(%rax) 10: f9 stc 11: 48 c1 e9 03 shr $0x3,%rcx 15: 80 3c 01 00 cmpb $0x0,(%rcx,%rax,1) 19: 0f 85 15 04 00 00 jne 0x434 1f: 48 8d 3d 95 f5 eb 0e lea 0xeebf595(%rip),%rdi # 0xeebf5bb 26: 48 8b 75 18 mov 0x18(%rbp),%rsi * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: e9 77 f7 ff ff jmp 0xfffff7ab 34: e8 a2 b0 38 00 call 0x38b0db 39: 90 nop 3a: 0f 0b ud2 3c: 90 nop 3d: e9 .byte 0xe9 3e: ff f5 push %rbp --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.