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AHgh+RoP0pSGCRjJwqaDjljKQ42AutkbKERjt4M1JHHpsppl73dZLKKfxbk1atCkTP4CZpWtEYlMA+ZPxLlPWaU=@vger.kernel.org X-Gm-Message-State: AOJu0YxsbxS8K1EcR+Pu3ZcKGbPHW5gleDY5VffcZma1Tu2T8CYtXxtR bW9Rak+vbBNSOUSMprD3XLFpkFKFDCeYxslxbfk/JUd1Qv95B5VIZlF5h1voqGzn/dCLZIXEHMa WoOlZ46Sv/tQBpbAys5BxyBgz7bPthTLZXKDInLzwk3RcxQW/2FqGCQEaN/c= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:2916:b0:69d:9dfb:7928 with SMTP id 006d021491bc7-6ae96c1002fmr12466994eaf.3.1786110994196; Fri, 07 Aug 2026 06:56:34 -0700 (PDT) Date: Fri, 07 Aug 2026 06:56:34 -0700 In-Reply-To: <673e3029.050a0220.363a1b.0024.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a75e412.01d0871a.3a0d52.0049.GAE@google.com> Subject: Re: [syzbot] [kernel?] general protection fault in device_move From: syzbot To: gregkh@linuxfoundation.org, kriish.sharma2006@gmail.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, rafael@kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: f9a2394a2348 Merge tag 'mm-hotfixes-stable-2026-08-06-18-4.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=101a02c6580000 kernel config: https://syzkaller.appspot.com/x/.config?x=86ba763b42fa66a dashboard link: https://syzkaller.appspot.com/bug?extid=1f4e278e8e1a9b01f95f compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=170d0fb9580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+1f4e278e8e1a9b01f95f@syzkaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc000000000b: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000058-0x000000000000005f] CPU: 1 UID: 0 PID: 4943 Comm: kworker/u9:1 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Workqueue: hci0 hci_rx_work RIP: 0010:klist_put lib/klist.c:212 [inline] RIP: 0010:klist_del lib/klist.c:230 [inline] RIP: 0010:klist_remove+0x156/0x340 lib/klist.c:249 Code: 4d 89 f5 49 c1 ed 03 43 80 7c 3d 00 00 74 08 4c 89 f7 e8 8d 64 84 f6 4d 8b 26 49 83 e4 fe 49 8d 7c 24 58 48 89 f8 48 c1 e8 03 <42> 80 3c 38 00 74 05 e8 6e 64 84 f6 49 8b 44 24 58 48 89 44 24 08 RSP: 0018:ffffc9000fc87700 EFLAGS: 00010202 RAX: 000000000000000b RBX: ffff888035a90000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000058 RBP: ffffc9000fc877e8 R08: ffffffff90199ae3 R09: 1ffffffff203335c R10: dffffc0000000000 R11: fffffbfff203335d R12: 0000000000000000 R13: 1ffff1100e64e20c R14: ffff888073271060 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff888125306000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4691400c30 CR3: 00000000750f0000 CR4: 00000000003526f0 Call Trace: device_move+0x18e/0x720 drivers/base/core.c:4698 hci_conn_del_sysfs+0xb8/0x1a0 net/bluetooth/hci_sysfs.c:75 hci_conn_cleanup net/bluetooth/hci_conn.c:170 [inline] hci_conn_del+0xc3d/0x1200 net/bluetooth/hci_conn.c:1308 hci_disconn_complete_evt+0x5ac/0x890 net/bluetooth/hci_event.c:3470 hci_event_func net/bluetooth/hci_event.c:7784 [inline] hci_event_packet+0x6cd/0xf10 net/bluetooth/hci_event.c:7835 hci_rx_work+0x3ee/0x1020 net/bluetooth/hci_core.c:4039 process_one_work kernel/workqueue.c:3322 [inline] process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:klist_put lib/klist.c:212 [inline] RIP: 0010:klist_del lib/klist.c:230 [inline] RIP: 0010:klist_remove+0x156/0x340 lib/klist.c:249 Code: 4d 89 f5 49 c1 ed 03 43 80 7c 3d 00 00 74 08 4c 89 f7 e8 8d 64 84 f6 4d 8b 26 49 83 e4 fe 49 8d 7c 24 58 48 89 f8 48 c1 e8 03 <42> 80 3c 38 00 74 05 e8 6e 64 84 f6 49 8b 44 24 58 48 89 44 24 08 RSP: 0018:ffffc9000fc87700 EFLAGS: 00010202 RAX: 000000000000000b RBX: ffff888035a90000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000058 RBP: ffffc9000fc877e8 R08: ffffffff90199ae3 R09: 1ffffffff203335c R10: dffffc0000000000 R11: fffffbfff203335d R12: 0000000000000000 R13: 1ffff1100e64e20c R14: ffff888073271060 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff888125306000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4691400c30 CR3: 000000007e68e000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 4d 89 f5 mov %r14,%r13 3: 49 c1 ed 03 shr $0x3,%r13 7: 43 80 7c 3d 00 00 cmpb $0x0,0x0(%r13,%r15,1) d: 74 08 je 0x17 f: 4c 89 f7 mov %r14,%rdi 12: e8 8d 64 84 f6 call 0xf68464a4 17: 4d 8b 26 mov (%r14),%r12 1a: 49 83 e4 fe and $0xfffffffffffffffe,%r12 1e: 49 8d 7c 24 58 lea 0x58(%r12),%rdi 23: 48 89 f8 mov %rdi,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) <-- trapping instruction 2f: 74 05 je 0x36 31: e8 6e 64 84 f6 call 0xf68464a4 36: 49 8b 44 24 58 mov 0x58(%r12),%rax 3b: 48 89 44 24 08 mov %rax,0x8(%rsp) --- 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.