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AHgh+RrBIn218eGRzmMAEhR1WVpPNMdwWP9G1lBXZ+K4RUn6W5//G8RTQklUL228orkMH/VghynU8RW1rzlgqSM=@vger.kernel.org X-Gm-Message-State: AOJu0YzKIJb03aeCbhu9c+9VA8zc6Q0pq3dvqK0XzFVdizuGvimcrFKN mLniWvJ02PGJgw574tWJBqnS3nUiY1AfGbp4an9emseZjvsSDtPLlzGdVM7KqemC9b7yrtPIKOn 7fqNG3Bc5bZRBlGdYPfkfhgnvEh8qprEUkBo8u8hpOi5oI1M3v+dnwuNaLcc= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:17a9:b0:48f:c907:7a40 with SMTP id 5614622812f47-4af5e1b5806mr1418049b6e.11.1785518013890; Fri, 31 Jul 2026 10:13:33 -0700 (PDT) Date: Fri, 31 Jul 2026 10:13:33 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a6cd7bd.1aa927e4.17d4bf.0004.GAE@google.com> Subject: [syzbot] [usb?] WARNING in usb_ep_enable 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" Hello, syzbot found the following issue on: HEAD commit: 11028ab62899 Merge tag 'probes-fixes-v7.2-rc5' of git://gi.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=1673649e580000 kernel config: https://syzkaller.appspot.com/x/.config?x=cb17729fb04b1e3a dashboard link: https://syzkaller.appspot.com/bug?extid=7b70c4a6021fd49c4151 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13074aea580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=161271b9580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/bc967be819a3/disk-11028ab6.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/6e9f003c9cc8/vmlinux-11028ab6.xz kernel image: https://storage.googleapis.com/syzbot-assets/5c292926486f/bzImage-11028ab6.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+7b70c4a6021fd49c4151@syzkaller.appspotmail.com ------------[ cut here ]------------ usb_ep_enable: ep129 (ep1in-bulk) has maxpacket 0 WARNING: drivers/usb/gadget/udc/core.c:125 at usb_ep_enable+0x148/0x480 drivers/usb/gadget/udc/core.c:124, CPU#1: ktimers/1/29 Modules linked in: CPU: 1 UID: 0 PID: 29 Comm: ktimers/1 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:usb_ep_enable+0x1bc/0x480 drivers/usb/gadget/udc/core.c:124 Code: 4a 17 02 fb 49 83 3f 00 48 c7 c0 60 b3 1f 8c 49 c7 c0 80 b3 1f 8c 4c 0f 44 c0 4c 89 f7 48 c7 c6 8b 42 b0 8d 44 89 ea 4c 89 e1 <67> 48 0f b9 3a bd ea ff ff ff 0f 1f 44 00 00 e8 40 a4 98 fa 65 8b RSP: 0018:ffffc90000a3f6b8 EFLAGS: 00010282 RAX: ffffffff8c1fb360 RBX: ffff88802a08c120 RCX: ffffffff8c1fd1e0 RDX: 0000000000000081 RSI: ffffffff8db0428b RDI: ffffffff8fbc9d40 RBP: dffffc0000000000 R08: ffffffff8c1fb380 R09: 0000000000000100 R10: 0000000000000100 R11: 0000000000000003 R12: ffffffff8c1fd1e0 R13: 0000000000000081 R14: ffffffff8fbc9d40 R15: ffff88802a08c138 FS: 0000000000000000(0000) GS:ffff888125d41000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000563af0aa84a0 CR3: 00000000382cc000 CR4: 00000000003526f0 Call Trace: hidg_set_alt+0x12a/0xa50 drivers/usb/gadget/function/f_hid.c:1042 set_config+0x749/0x1160 drivers/usb/gadget/composite.c:1018 composite_setup+0x1de7/0x3480 drivers/usb/gadget/composite.c:1901 configfs_composite_setup+0xbd/0x100 drivers/usb/gadget/configfs.c:1877 dummy_timer+0x2f77/0x4d50 drivers/usb/gadget/udc/dummy_hcd.c:1951 __run_hrtimer kernel/time/hrtimer.c:2032 [inline] __hrtimer_run_queues+0x3eb/0xaf0 kernel/time/hrtimer.c:2096 hrtimer_run_softirq+0x18f/0x260 kernel/time/hrtimer.c:2113 handle_softirqs+0x1d9/0x6c0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] run_ktimerd+0x69/0x100 kernel/softirq.c:1151 smpboot_thread_fn+0x57c/0xa80 kernel/smpboot.c:160 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 ---------------- Code disassembly (best guess): 0: 4a 17 rex.WX (bad) 2: 02 fb add %bl,%bh 4: 49 83 3f 00 cmpq $0x0,(%r15) 8: 48 c7 c0 60 b3 1f 8c mov $0xffffffff8c1fb360,%rax f: 49 c7 c0 80 b3 1f 8c mov $0xffffffff8c1fb380,%r8 16: 4c 0f 44 c0 cmove %rax,%r8 1a: 4c 89 f7 mov %r14,%rdi 1d: 48 c7 c6 8b 42 b0 8d mov $0xffffffff8db0428b,%rsi 24: 44 89 ea mov %r13d,%edx 27: 4c 89 e1 mov %r12,%rcx * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: bd ea ff ff ff mov $0xffffffea,%ebp 34: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 39: e8 40 a4 98 fa call 0xfa98a47e 3e: 65 gs 3f: 8b .byte 0x8b --- 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@googlegroups.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