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charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: WARNING in usb_start_wait_urb ------------[ cut here ]------------ usb 1-1: BOGUS control dir, pipe 80000280 doesn't match bRequestType c0 WARNING: drivers/usb/core/urb.c:414 at 0x0, CPU#1: syz.0.17/6455 Modules linked in: CPU: 1 UID: 0 PID: 6455 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+0x111c/0x18d0 drivers/usb/core/urb.c:412 Code: b8 00 00 00 00 00 fc ff df 0f b6 44 05 00 84 c0 0f 85 a7 05 00 00 45 0f b6 45 00 48 8b 3c 24 48 8b 74 24 20 4c 89 fa 44 89 f1 <67> 48 0f b9 3a 49 bf 00 00 00 00 00 fc ff df e9 b7 f2 ff ff 89 e9 RSP: 0018:ffffc90003f1f800 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff88807523df00 RCX: 0000000080000280 RDX: ffff8881404becc0 RSI: ffffffff8c35e540 RDI: ffffffff8fd058d0 RBP: 1ffff110287ec848 R08: 00000000000000c0 R09: 0000000000000000 R10: ffffc90003f1f900 R11: fffff520007e3f2c R12: ffff88807d6a5100 R13: ffff888143f64240 R14: 0000000080000280 R15: ffff8881404becc0 FS: 00007f80746386c0(0000) GS:ffff888125af0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000558e2419d738 CR3: 000000007303a000 CR4: 00000000003526f0 Call Trace: usb_start_wait_urb+0x115/0x4f0 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 dtv5100_i2c_msg+0x231/0x2f0 drivers/media/usb/dvb-usb/dtv5100.c:65 dtv5100_i2c_xfer+0x269/0x3c0 drivers/media/usb/dvb-usb/dtv5100.c:86 __i2c_transfer+0x871/0x2110 drivers/i2c/i2c-core-base.c:-1 i2c_transfer+0x25b/0x3a0 drivers/i2c/i2c-core-base.c:2317 i2cdev_ioctl_rdwr+0x460/0x740 drivers/i2c/i2c-dev.c:306 i2cdev_ioctl+0x64b/0x820 drivers/i2c/i2c-dev.c:467 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f807378f749 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:00007f8074638038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f80739e5fa0 RCX: 00007f807378f749 RDX: 0000200000000240 RSI: 0000000000000707 RDI: 0000000000000004 RBP: 00007f8073813f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f80739e6038 R14: 00007f80739e5fa0 R15: 00007ffc05fa7018 ---------------- Code disassembly (best guess): 0: b8 00 00 00 00 mov $0x0,%eax 5: 00 fc add %bh,%ah 7: ff (bad) 8: df 0f fisttps (%rdi) a: b6 44 mov $0x44,%dh c: 05 00 84 c0 0f add $0xfc08400,%eax 11: 85 a7 05 00 00 45 test %esp,0x45000005(%rdi) 17: 0f b6 45 00 movzbl 0x0(%rbp),%eax 1b: 48 8b 3c 24 mov (%rsp),%rdi 1f: 48 8b 74 24 20 mov 0x20(%rsp),%rsi 24: 4c 89 fa mov %r15,%rdx 27: 44 89 f1 mov %r14d,%ecx * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: 49 bf 00 00 00 00 00 movabs $0xdffffc0000000000,%r15 36: fc ff df 39: e9 b7 f2 ff ff jmp 0xfffff2f5 3e: 89 e9 mov %ebp,%ecx Tested on: commit: f231ce51 media: dvb-usb: dib0700: fix zero-length cont.. git tree: https://github.com/charmitro/linux.git console output: https://syzkaller.appspot.com/x/log.txt?x=122b301a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=b9f785244b836412 dashboard link: https://syzkaller.appspot.com/bug?extid=e6a50a2e7cbb4f775d04 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 Note: no patches were applied.