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Mon, 09 Mar 2026 07:25:11 -0700 (PDT) Date: Mon, 9 Mar 2026 10:25:09 -0400 From: Alan Stern To: syzbot Cc: gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [usb?] general protection fault in usb_gadget_udc_reset (4) Message-ID: References: <6f521b75-5e13-43b6-9e1d-d2a052c68597@rowland.harvard.edu> <69ad9d3d.050a0220.310d8.000e.GAE@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <69ad9d3d.050a0220.310d8.000e.GAE@google.com> On Sun, Mar 08, 2026 at 09:01:01AM -0700, syzbot wrote: > Hello, > > syzbot has tested the proposed patch and the reproducer did not trigger any issue: > > Reported-by: syzbot+19bed92c97bee999e5db@syzkaller.appspotmail.com > Tested-by: syzbot+19bed92c97bee999e5db@syzkaller.appspotmail.com > > Tested on: > > commit: 65169048 Merge tag 'spi-fix-v7.0-rc2' of git://git.ker.. > git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git > console output: https://syzkaller.appspot.com/x/log.txt?x=133f3fe6580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=2a019678b1a3a692 > dashboard link: https://syzkaller.appspot.com/bug?extid=19bed92c97bee999e5db > compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 > patch: https://syzkaller.appspot.com/x/patch.diff?x=178dc8ba580000 > > Note: testing is done by a robot and is best-effort only. That's not very helpful. Let's try a slightly different approach. Alan Stern #syz test: upstream 651690480a96 Index: usb-devel/drivers/usb/gadget/udc/core.c =================================================================== --- usb-devel.orig/drivers/usb/gadget/udc/core.c +++ usb-devel/drivers/usb/gadget/udc/core.c @@ -1192,7 +1192,9 @@ EXPORT_SYMBOL_GPL(usb_udc_vbus_handler); void usb_gadget_udc_reset(struct usb_gadget *gadget, struct usb_gadget_driver *driver) { + dev_info(&gadget->dev, "Reset #1, driver %p\n", driver); driver->reset(gadget); + dev_info(&gadget->dev, "Reset #2\n"); usb_gadget_set_state(gadget, USB_STATE_DEFAULT); } EXPORT_SYMBOL_GPL(usb_gadget_udc_reset);