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006d021491bc7-67b9bcdbaa1mr3039961eaf.32.1772880744881; Sat, 07 Mar 2026 02:52:24 -0800 (PST) Date: Sat, 07 Mar 2026 02:52:24 -0800 In-Reply-To: <68fc7c9c.050a0220.346f24.023c.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69ac0368.050a0220.13f275.004d.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, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: 651690480a96 Merge tag 'spi-fix-v7.0-rc2' of git://git.ker.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11ec0806580000 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 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10b2db5a580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14fed8d6580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/0e393fccfaa3/disk-65169048.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/2930e8c98c89/vmlinux-65169048.xz kernel image: https://storage.googleapis.com/syzbot-assets/34e9e7d322b1/bzImage-65169048.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+19bed92c97bee999e5db@syzkaller.appspotmail.com usb 1-1: reset high-speed USB device number 2 using dummy_hcd usb 1-1: device descriptor read/8, error -32 Oops: general protection fault, probably [ 120.351719][ T6052] 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: 6052 Comm: kworker/0:7 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 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: 0018:ffffc9000415e4c8 EFLAGS: 00010202 RAX: 0000000000000008 RBX: ffff888029facc40 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff8880341b2b6c R08: ffffffff8f6a4eb7 R09: 1ffffffff1ed49d6 R10: dffffc0000000000 R11: fffffbfff1ed49d7 R12: ffff888029facc40 R13: 1ffff110053f38a1 R14: 0000000000000040 R15: 1ffff110053f5987 FS: 0000000000000000(0000) GS:ffff88812633d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007eff7c4020c0 CR3: 00000000324ce000 CR4: 00000000003526f0 Call Trace: set_link_state+0x80b/0x1220 drivers/usb/gadget/udc/dummy_hcd.c:469 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 usb_reset_and_verify_device+0x1661/0x1af0 drivers/usb/core/hub.c:6215 usb_reset_device+0x551/0xb40 drivers/usb/core/hub.c:6410 sd_config+0x27f/0x15b0 drivers/media/usb/gspca/se401.c:221 gspca_dev_probe2+0x81e/0x1450 drivers/media/usb/gspca/gspca.c:1529 usb_probe_interface+0x668/0xc90 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x267/0xaf0 drivers/base/dd.c:661 __driver_probe_device+0x18c/0x320 drivers/base/dd.c:803 driver_probe_device+0x4f/0x240 drivers/base/dd.c:833 __device_attach_driver+0x2d4/0x4c0 drivers/base/dd.c:961 bus_for_each_drv+0x25b/0x2f0 drivers/base/bus.c:500 __device_attach+0x2c8/0x450 drivers/base/dd.c:1033 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1088 bus_probe_device+0x12d/0x220 drivers/base/bus.c:574 device_add+0x7b6/0xb80 drivers/base/core.c:3689 usb_set_configuration+0x1a87/0x2110 drivers/usb/core/message.c:2208 usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250 usb_probe_device+0x1c4/0x3b0 drivers/usb/core/driver.c:291 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x267/0xaf0 drivers/base/dd.c:661 __driver_probe_device+0x18c/0x320 drivers/base/dd.c:803 driver_probe_device+0x4f/0x240 drivers/base/dd.c:833 __device_attach_driver+0x2d4/0x4c0 drivers/base/dd.c:961 bus_for_each_drv+0x25b/0x2f0 drivers/base/bus.c:500 __device_attach+0x2c8/0x450 drivers/base/dd.c:1033 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1088 bus_probe_device+0x12d/0x220 drivers/base/bus.c:574 device_add+0x7b6/0xb80 drivers/base/core.c:3689 usb_new_device+0x9f8/0x16e0 drivers/usb/core/hub.c:2695 hub_port_connect drivers/usb/core/hub.c:5567 [inline] hub_port_connect_change drivers/usb/core/hub.c:5707 [inline] port_event drivers/usb/core/hub.c:5871 [inline] hub_event+0x2a49/0x4f60 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: 0018:ffffc9000415e4c8 EFLAGS: 00010202 RAX: 0000000000000008 RBX: ffff888029facc40 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff8880341b2b6c R08: ffffffff8f6a4eb7 R09: 1ffffffff1ed49d6 R10: dffffc0000000000 R11: fffffbfff1ed49d7 R12: ffff888029facc40 R13: 1ffff110053f38a1 R14: 0000000000000040 R15: 1ffff110053f5987 FS: 0000000000000000(0000) GS:ffff88812633d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007eff7c4020c0 CR3: 00000000379ee000 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 --- 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.