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Sun, 18 Oct 2026 00:19:31 -0700 (PDT) Date: Sun, 18 Oct 2026 00:19:31 -0700 In-Reply-To: <6ac5d1ad.353c8d8e.177895.000d.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6ad47303.a6d1a155.34a93f.0086.GAE@google.com> Subject: Re: [syzbot] [bluetooth?] WARNING in hci_recv_frame (2) From: syzbot To: 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: 32c52ec87d62 x86/insn-eval: Fix shadowed segment index in .. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git console output: https://syzkaller.appspot.com/x/log.txt?x=10999621580000 kernel config: https://syzkaller.appspot.com/x/.config?x=4ccb65e03706547e dashboard link: https://syzkaller.appspot.com/bug?extid=2344fb8002f3ef5b1712 compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17870f01580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+2344fb8002f3ef5b1712@syzkaller.appspotmail.com ------------[ cut here ]------------ workqueue: cannot queue hci_rx_work on wq hci0 WARNING: kernel/workqueue.c:2353 at __queue_work+0xd93/0x10e0 kernel/workqueue.c:2352, CPU#0: syz-executor360/5620 Modules linked in: CPU: 0 UID: 0 PID: 5620 Comm: syz-executor360 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+0xdaf/0x10e0 kernel/workqueue.c:2352 Code: 49 81 c7 70 01 00 00 4c 8d 35 dd 08 ef 0f 48 89 f8 48 c1 e8 03 80 3c 18 00 74 05 e8 8b 37 ac 00 49 8b 75 18 4c 89 f7 4c 89 fa <67> 48 0f b9 3a 4c 89 e8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ef e8 RSP: 0018:ffffc90002bc7af8 EFLAGS: 00010046 RAX: 1ffff1100266f978 RBX: dffffc0000000000 RCX: ffff888035d04b00 RDX: ffff888013890970 RSI: ffffffff8adabbd0 RDI: ffffffff917d6fa0 RBP: 0000000000000000 R08: ffff88801337cbaf R09: 1ffff1100266f975 R10: dffffc0000000000 R11: ffffed100266f976 R12: 0000000000000008 R13: ffff88801337cba8 R14: ffffffff917d6fa0 R15: ffff888013890970 FS: 00007f02356e36c0(0000) GS:ffff88808b0b4000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000056507f781b68 CR3: 000000001468d000 CR4: 0000000000352ef0 Call Trace: queue_work_on+0x106/0x1d0 kernel/workqueue.c:2501 queue_work include/linux/workqueue.h:700 [inline] hci_recv_frame+0x61e/0x7c0 net/bluetooth/hci_core.c:2946 vhci_get_user drivers/bluetooth/hci_vhci.c:530 [inline] vhci_write+0x35d/0x4a0 drivers/bluetooth/hci_vhci.c:626 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x612/0xba0 fs/read_write.c:687 ksys_write+0x150/0x270 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f023773e24e Code: 08 0f 85 05 e3 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 90 41 57 41 56 4d 89 c6 41 55 4d 89 cd 41 54 55 53 48 83 ec 08 RSP: 002b:00007f02356e3198 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f02356e36c0 RCX: 00007f023773e24e RDX: 0000000000000007 RSI: 00007f0237789050 RDI: 0000000000000003 RBP: 00007f0237789050 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0237789057 R13: 0000000000000000 R14: 00007ffc8187e190 R15: 00007ffc8187e278 ---------------- Code disassembly (best guess): 0: 49 81 c7 70 01 00 00 add $0x170,%r15 7: 4c 8d 35 dd 08 ef 0f lea 0xfef08dd(%rip),%r14 # 0xfef08eb e: 48 89 f8 mov %rdi,%rax 11: 48 c1 e8 03 shr $0x3,%rax 15: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) 19: 74 05 je 0x20 1b: e8 8b 37 ac 00 call 0xac37ab 20: 49 8b 75 18 mov 0x18(%r13),%rsi 24: 4c 89 f7 mov %r14,%rdi 27: 4c 89 fa mov %r15,%rdx * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: 4c 89 e8 mov %r13,%rax 32: 48 c1 e8 03 shr $0x3,%rax 36: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) 3a: 74 08 je 0x44 3c: 4c 89 ef mov %r13,%rdi 3f: e8 .byte 0xe8 --- 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.