From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f198.google.com (mail-oi1-f198.google.com [209.85.167.198]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0080F33F8BE for ; Sat, 8 Aug 2026 09:48:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.198 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786182505; cv=none; b=AfAixbUaBp4Ocx7oRHNJQ0r11JcD0YqTCYYu1tkU5KsdLSA58iMSd/ev7EjKbvV7TL2A44jXOmC+o+omS3rin05WbBeZ16bZvYdhEG7TxMBVXLPsqqRlCNPGckdbd2Vafgt+l/Z7FoEH/J3BkfP+7+SCMLTr9n53JT3eI1FHOQM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786182505; c=relaxed/simple; bh=plAcaAfWJxE01uPirDC5GWjyqjI4nWQRqs3riEN01BE=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; 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2002:a05:6808:66d5:b0:4b1:b037:da8b with SMTP id 5614622812f47-4b1b037ddabmr1851825b6e.11.1786182502947; Sat, 08 Aug 2026 02:48:22 -0700 (PDT) Date: Sat, 08 Aug 2026 02:48:22 -0700 In-Reply-To: <6a6d379a.2d659fcc.1d46f5.01a8.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a76fb66.b50370da.49fe0.0025.GAE@google.com> Subject: Re: [syzbot] [net?] [usb?] BUG: using smp_processor_id() in preemptible code in tx_complete From: syzbot To: andrew@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, netdev@vger.kernel.org, oneukum@suse.com, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: a59f57e2aa12 Merge tag 'watchdog-for-v7.2-rc7' of git://gi.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=127defb9580000 kernel config: https://syzkaller.appspot.com/x/.config?x=d07fbc6821d72a61 dashboard link: https://syzkaller.appspot.com/bug?extid=04cd90bb99c6ef81a65d compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17106fb9580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+04cd90bb99c6ef81a65d@syzkaller.appspotmail.com BUG: using smp_processor_id() in preemptible [00000000] code: vhci_rx/6048 caller is tx_complete+0x237/0x770 drivers/net/usb/usbnet.c:1301 CPU: 2 UID: 0 PID: 6048 Comm: vhci_rx 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 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 check_preemption_disabled+0xd8/0xe0 lib/smp_processor_id.c:47 tx_complete+0x237/0x770 drivers/net/usb/usbnet.c:1301 __usb_hcd_giveback_urb+0x38d/0x610 drivers/usb/core/hcd.c:1657 usb_hcd_giveback_urb+0x3ca/0x4a0 drivers/usb/core/hcd.c:1741 vhci_recv_ret_submit drivers/usb/usbip/vhci_rx.c:107 [inline] vhci_rx_pdu drivers/usb/usbip/vhci_rx.c:242 [inline] vhci_rx_loop+0x60e/0xa60 drivers/usb/usbip/vhci_rx.c:265 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 BUG: using smp_processor_id() in preemptible [00000000] code: vhci_rx/6048 caller is tx_complete+0x237/0x770 drivers/net/usb/usbnet.c:1301 CPU: 1 UID: 0 PID: 6048 Comm: vhci_rx 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 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 check_preemption_disabled+0xd8/0xe0 lib/smp_processor_id.c:47 tx_complete+0x237/0x770 drivers/net/usb/usbnet.c:1301 __usb_hcd_giveback_urb+0x38d/0x610 drivers/usb/core/hcd.c:1657 usb_hcd_giveback_urb+0x3ca/0x4a0 drivers/usb/core/hcd.c:1741 vhci_recv_ret_submit drivers/usb/usbip/vhci_rx.c:107 [inline] vhci_rx_pdu drivers/usb/usbip/vhci_rx.c:242 [inline] vhci_rx_loop+0x60e/0xa60 drivers/usb/usbip/vhci_rx.c:265 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 BUG: using smp_processor_id() in preemptible [00000000] code: vhci_rx/6048 caller is tx_complete+0x237/0x770 drivers/net/usb/usbnet.c:1301 CPU: 3 UID: 0 PID: 6048 Comm: vhci_rx 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 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 check_preemption_disabled+0xd8/0xe0 lib/smp_processor_id.c:47 tx_complete+0x237/0x770 drivers/net/usb/usbnet.c:1301 __usb_hcd_giveback_urb+0x38d/0x610 drivers/usb/core/hcd.c:1657 usb_hcd_giveback_urb+0x3ca/0x4a0 drivers/usb/core/hcd.c:1741 vhci_recv_ret_submit drivers/usb/usbip/vhci_rx.c:107 [inline] vhci_rx_pdu drivers/usb/usbip/vhci_rx.c:242 [inline] vhci_rx_loop+0x60e/0xa60 drivers/usb/usbip/vhci_rx.c:265 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 BUG: using smp_processor_id() in preemptible [00000000] code: vhci_rx/6048 caller is tx_complete+0x237/0x770 drivers/net/usb/usbnet.c:1301 CPU: 0 UID: 0 PID: 6048 Comm: vhci_rx 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 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 check_preemption_disabled+0xd8/0xe0 lib/smp_processor_id.c:47 tx_complete+0x237/0x770 drivers/net/usb/usbnet.c:1301 __usb_hcd_giveback_urb+0x38d/0x610 drivers/usb/core/hcd.c:1657 usb_hcd_giveback_urb+0x3ca/0x4a0 drivers/usb/core/hcd.c:1741 vhci_recv_ret_submit drivers/usb/usbip/vhci_rx.c:107 [inline] vhci_rx_pdu drivers/usb/usbip/vhci_rx.c:242 [inline] vhci_rx_loop+0x60e/0xa60 drivers/usb/usbip/vhci_rx.c:265 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 BUG: using smp_processor_id() in preemptible [00000000] code: vhci_rx/6048 caller is tx_complete+0x237/0x770 drivers/net/usb/usbnet.c:1301 CPU: 0 UID: 0 PID: 6048 Comm: vhci_rx 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 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 check_preemption_disabled+0xd8/0xe0 lib/smp_processor_id.c:47 tx_complete+0x237/0x770 drivers/net/usb/usbnet.c:1301 __usb_hcd_giveback_urb+0x38d/0x610 drivers/usb/core/hcd.c:1657 usb_hcd_giveback_urb+0x3ca/0x4a0 drivers/usb/core/hcd.c:1741 vhci_recv_ret_submit drivers/usb/usbip/vhci_rx.c:107 [inline] vhci_rx_pdu drivers/usb/usbip/vhci_rx.c:242 [inline] vhci_rx_loop+0x60e/0xa60 drivers/usb/usbip/vhci_rx.c:265 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 BUG: using smp_processor_id() in preemptible [00000000] code: vhci_rx/6048 caller is tx_complete+0x237/0x770 drivers/net/usb/usbnet.c:1301 CPU: 0 UID: 0 PID: 6048 Comm: vhci_rx 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 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 check_preemption_disabled+0xd8/0xe0 lib/smp_processor_id.c:47 tx_complete+0x237/0x770 drivers/net/usb/usbnet.c:1301 __usb_hcd_giveback_urb+0x38d/0x610 drivers/usb/core/hcd.c:1657 usb_hcd_giveback_urb+0x3ca/0x4a0 drivers/usb/core/hcd.c:1741 vhci_recv_ret_submit drivers/usb/usbip/vhci_rx.c:107 [inline] vhci_rx_pdu drivers/usb/usbip/vhci_rx.c:242 [inline] vhci_rx_loop+0x60e/0xa60 drivers/usb/usbip/vhci_rx.c:265 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 BUG: using smp_processor_id() in preemptible [00000000] code: vhci_rx/6048 caller is tx_complete+0x237/0x770 drivers/net/usb/usbnet.c:1301 CPU: 2 UID: 0 PID: 6048 Comm: vhci_rx 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 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 check_preemption_disabled+0xd8/0xe0 lib/smp_processor_id.c:47 tx_complete+0x237/0x770 drivers/net/usb/usbnet.c:1301 __usb_hcd_giveback_urb+0x38d/0x610 drivers/usb/core/hcd.c:1657 usb_hcd_giveback_urb+0x3ca/0x4a0 drivers/usb/core/hcd.c:1741 vhci_recv_ret_submit drivers/usb/usbip/vhci_rx.c:107 [inline] vhci_rx_pdu drivers/usb/usbip/vhci_rx.c:242 [inline] vhci_rx_loop+0x60e/0xa60 drivers/usb/usbip/vhci_rx.c:265 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 BUG: using smp_processor_id() in preemptible [00000000] code: vhci_rx/6048 caller is tx_complete+0x237/0x770 drivers/net/usb/usbnet.c:1301 CPU: 3 UID: 0 PID: 6048 Comm: vhci_rx 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 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 check_preemption_disabled+0xd8/0xe0 lib/smp_processor_id.c:47 tx_complete+0x237/0x770 drivers/net/usb/usbnet.c:1301 __usb_hcd_giveback_urb+0x38d/0x610 drivers/usb/core/hcd.c:1657 usb_hcd_giveback_urb+0x3ca/0x4a0 drivers/usb/core/hcd.c:1741 vhci_recv_ret_submit drivers/usb/usbip/vhci_rx.c:107 [inline] vhci_rx_pdu drivers/usb/usbip/vhci_rx.c:242 [inline] vhci_rx_loop+0x60e/0xa60 drivers/usb/usbip/vhci_rx.c:265 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 vhci_hcd: connection reset by peer --- 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.