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AJvYcCXsHwZeCGJZUmVPlvHdXIEweAPbzEqRmADQbXH3ahJW9qZpEjscxL+s01m33VmgddOu9KflAv8jUAdDpVk=@vger.kernel.org X-Gm-Message-State: AOJu0YwqGlEu3sjUeaVbRd75e1Wp2LcWrCuPIQwik7OO02LgkqOO0RhY qW3x3csEPCZnBnL8wz+moRr4l57uRcLFKqo1t+1yEcciDiPpuXo4/3AJAKggu/vBdOGJ8UM7rxd 8U/qDvpaOVD3BLsqmY07xLKrRmHcjfYs/84qp9WawKDhQBfwPtyMgm4G4zLE= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:2f05:b0:45f:2042:8fbe with SMTP id 5614622812f47-467333eeb58mr703205b6e.13.1773198963511; Tue, 10 Mar 2026 20:16:03 -0700 (PDT) Date: Tue, 10 Mar 2026 20:16:03 -0700 In-Reply-To: <8b3636bc-3446-4b4c-a8cf-d940be933c4b@rowland.harvard.edu> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69b0de73.050a0220.381736.0007.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 gadget gadget.0: Reset usage 1 gadget gadget.0: Reset #1, gadget ffff888027440c40 driver 0000000000000000 Oops: general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047] CPU: 1 UID: 0 PID: 6315 Comm: kworker/1:5 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+0x45/0x80 drivers/usb/gadget/udc/core.c:1201 Code: 4c 89 f7 48 c7 c6 a0 d2 fb 8b 48 89 da 4c 89 f9 e8 20 5b fd ff 49 83 c7 40 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ff e8 ed ea fb 00 4d 8b 1f 48 89 df 2e 2e RSP: 0018:ffffc90003d77308 EFLAGS: 00010202 RAX: 0000000000000008 RBX: ffff888027440c40 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000010 R08: 0000000000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: ffffed1017124923 R12: ffff888027440c40 R13: ffff888029fe250b R14: ffff888027440d58 R15: 0000000000000040 FS: 0000000000000000(0000) GS:ffff88812643d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f168c5e3286 CR3: 0000000036838000 CR4: 00000000003526f0 Call Trace: set_link_state+0xad6/0xff0 drivers/usb/gadget/udc/dummy_hcd.c:471 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+0x45/0x80 drivers/usb/gadget/udc/core.c:1201 Code: 4c 89 f7 48 c7 c6 a0 d2 fb 8b 48 89 da 4c 89 f9 e8 20 5b fd ff 49 83 c7 40 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ff e8 ed ea fb 00 4d 8b 1f 48 89 df 2e 2e RSP: 0018:ffffc90003d77308 EFLAGS: 00010202 RAX: 0000000000000008 RBX: ffff888027440c40 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000010 R08: 0000000000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: ffffed1017124923 R12: ffff888027440c40 R13: ffff888029fe250b R14: ffff888027440d58 R15: 0000000000000040 FS: 0000000000000000(0000) GS:ffff88812643d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f168c5e3286 CR3: 0000000036838000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 4c 89 f7 mov %r14,%rdi 3: 48 c7 c6 a0 d2 fb 8b mov $0xffffffff8bfbd2a0,%rsi a: 48 89 da mov %rbx,%rdx d: 4c 89 f9 mov %r15,%rcx 10: e8 20 5b fd ff call 0xfffd5b35 15: 49 83 c7 40 add $0x40,%r15 19: 4c 89 f8 mov %r15,%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 ff mov %r15,%rdi 33: e8 ed ea fb 00 call 0xfbeb25 38: 4d 8b 1f mov (%r15),%r11 3b: 48 89 df mov %rbx,%rdi 3e: 2e cs 3f: 2e cs 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=15cd975a580000 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=16e44d52580000