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AJvYcCVarKuV3fLocFJbZlEfsLJkjWunxsO5+X498DLvLJRhB2cu8FcnnxPrVL10clX+wqBNFC50Txqjrnvia3c=@vger.kernel.org X-Gm-Message-State: AOJu0Yz7Fmmc6qnkNGQJ0xjPqHVH7Ku5a9qPrrplqDNqHMOJiW0QbG9w BxQGEvaQOMy4RISwZHgyy9LlOXMrDx7LBYtoRX1gtWsq7a097fj50Trt30M0SUH7TfpIFsnsNim z03DrR78ss6AWY6Hu/J1GzCqPaY33xRvBuEf1/TWZVKClf7n5i/5wzDxvxc4= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:2222:b0:676:84e2:1551 with SMTP id 006d021491bc7-67bc8acb0cfmr2421897eaf.76.1773257104206; Wed, 11 Mar 2026 12:25:04 -0700 (PDT) Date: Wed, 11 Mar 2026 12:25:04 -0700 In-Reply-To: <497b1bab-984c-43d7-9ef0-6614d2c1b426@rowland.harvard.edu> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69b1c190.a00a0220.707e5.0002.GAE@google.com> Subject: Re: [syzbot] [usb?] general protection fault in usb_gadget_udc_reset (4) From: syzbot To: gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, stern@rowland.harvard.edu, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: general protection fault in usb_gadget_udc_reset Oops: general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047] CPU: 0 UID: 0 PID: 5896 Comm: kworker/0:3 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/27/2026 Workqueue: usb_hub_wq hub_event RIP: 0010:usb_gadget_udc_reset+0x27/0x60 drivers/usb/gadget/udc/core.c:1200 Code: 90 90 90 f3 0f 1e fa 41 56 53 49 89 f6 48 89 fb e8 6e 5c c0 fa 49 83 c6 40 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 f7 e8 cb 74 26 fb 4d 8b 1e 48 89 df 2e e8 RSP: 0000:ffffc90004e97308 EFLAGS: 00010202 RAX: 0000000000000008 RBX: ffff888027e5cc40 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff888027e5c000 R08: ffffffff8f6a4fb7 R09: 1ffffffff1ed49f6 R10: dffffc0000000000 R11: ffffffff8b2104d0 R12: ffff888027e5cc3c R13: ffff888027e5cbc0 R14: 0000000000000040 R15: 1ffff11004fcb987 FS: 0000000000000000(0000) GS:ffff88812633d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000558766fe1070 CR3: 000000003a8c8000 CR4: 00000000003526f0 Call Trace: set_link_state+0x81b/0x1340 drivers/usb/gadget/udc/dummy_hcd.c:473 dummy_hub_control+0xa09/0x1a00 drivers/usb/gadget/udc/dummy_hcd.c:-1 rh_call_control drivers/usb/core/hcd.c:652 [inline] rh_urb_enqueue drivers/usb/core/hcd.c:817 [inline] usb_hcd_submit_urb+0xdbe/0x1b50 drivers/usb/core/hcd.c:1538 usb_start_wait_urb+0x12b/0x510 drivers/usb/core/message.c:59 usb_internal_control_msg drivers/usb/core/message.c:103 [inline] usb_control_msg+0x232/0x3e0 drivers/usb/core/message.c:154 set_port_feature drivers/usb/core/hub.c:466 [inline] hub_port_reset+0x3c7/0x1820 drivers/usb/core/hub.c:3083 hub_port_init+0x299/0x28c0 drivers/usb/core/hub.c:4939 hub_port_connect drivers/usb/core/hub.c:5496 [inline] hub_port_connect_change drivers/usb/core/hub.c:5707 [inline] port_event drivers/usb/core/hub.c:5871 [inline] hub_event+0x25d3/0x4f60 drivers/usb/core/hub.c:5953 process_one_work kernel/workqueue.c:3275 [inline] process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358 worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x51e/0xb90 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:usb_gadget_udc_reset+0x27/0x60 drivers/usb/gadget/udc/core.c:1200 Code: 90 90 90 f3 0f 1e fa 41 56 53 49 89 f6 48 89 fb e8 6e 5c c0 fa 49 83 c6 40 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 f7 e8 cb 74 26 fb 4d 8b 1e 48 89 df 2e e8 RSP: 0000:ffffc90004e97308 EFLAGS: 00010202 RAX: 0000000000000008 RBX: ffff888027e5cc40 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff888027e5c000 R08: ffffffff8f6a4fb7 R09: 1ffffffff1ed49f6 R10: dffffc0000000000 R11: ffffffff8b2104d0 R12: ffff888027e5cc3c R13: ffff888027e5cbc0 R14: 0000000000000040 R15: 1ffff11004fcb987 FS: 0000000000000000(0000) GS:ffff88812633d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000558766fe1070 CR3: 0000000038c0e000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 90 nop 1: 90 nop 2: 90 nop 3: f3 0f 1e fa endbr64 7: 41 56 push %r14 9: 53 push %rbx a: 49 89 f6 mov %rsi,%r14 d: 48 89 fb mov %rdi,%rbx 10: e8 6e 5c c0 fa call 0xfac05c83 15: 49 83 c6 40 add $0x40,%r14 19: 4c 89 f0 mov %r14,%rax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 27: fc ff df * 2a: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 f7 mov %r14,%rdi 33: e8 cb 74 26 fb call 0xfb267503 38: 4d 8b 1e mov (%r14),%r11 3b: 48 89 df mov %rbx,%rdi 3e: 2e cs 3f: e8 .byte 0xe8 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=143d04d6580000 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=1686575a580000