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Message-ID: <692ccc4c.a70a0220.d98e3.0175.GAE@google.com> Date: Sun, 30 Nov 2025 14:59:24 -0800 From: syzbot <syzbot+c708736c2ec142a386fd@...kaller.appspotmail.com> To: dmitry.torokhov@...il.com, linux-input@...r.kernel.org, linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: [syzbot] [input?] [usb?] WARNING in cm109_urb_irq_callback Hello, syzbot found the following issue on: HEAD commit: 663d0d1af3fa Add linux-next specific files for 20251126 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=14c584b4580000 kernel config: https://syzkaller.appspot.com/x/.config?x=c8705ffbbff9235f dashboard link: https://syzkaller.appspot.com/bug?extid=c708736c2ec142a386fd compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10746f42580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1456de12580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/bccd41a8a8ce/disk-663d0d1a.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/21ebce6fa0f2/vmlinux-663d0d1a.xz kernel image: https://storage.googleapis.com/syzbot-assets/441ffa7b502f/bzImage-663d0d1a.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c708736c2ec142a386fd@...kaller.appspotmail.com cm109 1-1:0.8: cm109_urb_irq_callback: urb status -71 ------------[ cut here ]------------ URB ffff8880269d7000 submitted while active WARNING: drivers/usb/core/urb.c:380 at 0x0, CPU#1: syz.0.17/6058 Modules linked in: CPU: 1 UID: 0 PID: 6058 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:usb_submit_urb+0x7e/0x18d0 drivers/usb/core/urb.c:380 Code: 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 67 4e 21 fb 49 83 3e 00 74 40 e8 bc fe ba fa 48 8d 3d 75 5b c5 08 48 89 de <67> 48 0f b9 3a b8 f0 ff ff ff eb 11 e8 a1 fe ba fa eb 05 e8 9a fe RSP: 0018:ffffc90000a08878 EFLAGS: 00010046 RAX: ffffffff8706e144 RBX: ffff8880269d7000 RCX: ffff88802503bd00 RDX: 0000000000000100 RSI: ffff8880269d7000 RDI: ffffffff8fcc3cc0 RBP: 000000000000000f R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff52000141100 R12: 0000000000000820 R13: ffff88807b288030 R14: ffff8880269d7008 R15: dffffc0000000000 FS: 0000555591d77500(0000) GS:ffff888125b3e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2160730e9c CR3: 000000007837a000 CR4: 00000000003526f0 Call Trace: <IRQ> cm109_submit_ctl drivers/input/misc/cm109.c:380 [inline] cm109_urb_irq_callback+0x709/0xcd0 drivers/input/misc/cm109.c:431 __usb_hcd_giveback_urb+0x376/0x540 drivers/usb/core/hcd.c:1661 dummy_timer+0x85f/0x45b0 drivers/usb/gadget/udc/dummy_hcd.c:1995 __run_hrtimer kernel/time/hrtimer.c:1777 [inline] __hrtimer_run_queues+0x51c/0xc30 kernel/time/hrtimer.c:1841 hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1858 handle_softirqs+0x27d/0x850 kernel/softirq.c:626 __do_softirq kernel/softirq.c:660 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:727 irq_exit_rcu+0x9/0x30 kernel/softirq.c:743 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xa8/0x110 kernel/locking/spinlock.c:194 Code: 74 05 e8 eb f6 64 f6 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4f f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> a3 7f 2c f6 65 8b 05 2c 61 59 07 85 c0 74 40 48 c7 04 24 0e 36 RSP: 0018:ffffc90003b7faa0 EFLAGS: 00000206 RAX: ea11a46cfad79300 RBX: 0000000000000a02 RCX: ea11a46cfad79300 RDX: 0000000000000006 RSI: ffffffff8da6f16a RDI: 0000000000000001 RBP: ffffc90003b7fb28 R08: ffffffff8fbf8277 R09: 1ffffffff1f7f04e R10: dffffc0000000000 R11: fffffbfff1f7f04f R12: dffffc0000000000 R13: 1ffff1102887017f R14: ffff888144380000 R15: 1ffff9200076ff54 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline] dummy_pullup+0x18c/0x200 drivers/usb/gadget/udc/dummy_hcd.c:926 usb_gadget_disconnect_locked+0x143/0x490 drivers/usb/gadget/udc/core.c:780 gadget_unbind_driver+0xc7/0x460 drivers/usb/gadget/udc/core.c:1685 device_remove drivers/base/dd.c:569 [inline] __device_release_driver drivers/base/dd.c:1274 [inline] device_release_driver_internal+0x46f/0x800 drivers/base/dd.c:1297 driver_detach+0x1f3/0x2d0 drivers/base/dd.c:1360 bus_remove_driver+0x226/0x320 drivers/base/bus.c:785 usb_gadget_unregister_driver+0x4e/0x70 drivers/usb/gadget/udc/core.c:1751 raw_release+0xd7/0x260 drivers/usb/gadget/legacy/raw_gadget.c:463 __fput+0x44c/0xa70 fs/file_table.c:468 task_work_run+0x1d4/0x260 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:44 [inline] exit_to_user_mode_loop+0xff/0x4f0 kernel/entry/common.c:75 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline] do_syscall_64+0x2e3/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff71818f749 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc6614e5d8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 000000000001fed9 RCX: 00007ff71818f749 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000001 R09: 000000056614e8cf R10: 0000001b31f20000 R11: 0000000000000246 R12: 00007ff7183e5fac R13: 00007ff7183e5fa0 R14: ffffffffffffffff R15: 0000000000000003 </TASK> ---------------- Code disassembly (best guess): 0: 89 f0 mov %esi,%eax 2: 48 c1 e8 03 shr $0x3,%rax 6: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) b: 74 08 je 0x15 d: 4c 89 f7 mov %r14,%rdi 10: e8 67 4e 21 fb call 0xfb214e7c 15: 49 83 3e 00 cmpq $0x0,(%r14) 19: 74 40 je 0x5b 1b: e8 bc fe ba fa call 0xfabafedc 20: 48 8d 3d 75 5b c5 08 lea 0x8c55b75(%rip),%rdi # 0x8c55b9c 27: 48 89 de mov %rbx,%rsi * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: b8 f0 ff ff ff mov $0xfffffff0,%eax 34: eb 11 jmp 0x47 36: e8 a1 fe ba fa call 0xfabafedc 3b: eb 05 jmp 0x42 3d: e8 .byte 0xe8 3e: 9a (bad) 3f: fe .byte 0xfe --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@...glegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title 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. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
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