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Sun, 06 Sep 2026 21:24:02 -0700 (PDT) Date: Sun, 06 Sep 2026 21:24:02 -0700 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a9e3c62.a6639fcc.23b8b0.0010.GAE@google.com> Subject: Re: [syzbot] WARNING in usb_composite_setup_continue From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, tkdkei@outlook.jp Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: WARNING in usb_composite_setup_continue ------------[ cut here ]------------ usb_composite_setup_continue: Unexpected call WARNING: drivers/usb/gadget/composite.c:2743 at usb_composite_setup_continue+0x2be/0x3a0 drivers/usb/gadget/composite.c:2743, CPU#0: file-storage/5924 Modules linked in: CPU: 0 UID: 0 PID: 5924 Comm: file-storage Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026 RIP: 0010:usb_composite_setup_continue+0x2c5/0x3a0 drivers/usb/gadget/composite.c:2743 Code: e5 40 89 ee e8 8c 5c 30 fa 40 84 ed 0f 84 35 fe ff ff e9 08 ab 78 f9 e8 69 62 30 fa 48 8d 3d 82 75 76 09 48 c7 c6 40 b7 d9 8c <67> 48 0f b9 3a e9 d6 fd ff ff e8 4c 62 30 fa 48 89 da 48 b8 00 00 RSP: 0018:ffffc900026dfc88 EFLAGS: 00010093 RAX: 0000000000000000 RBX: ffff888013232528 RCX: 0000000000000001 RDX: ffff88802cce4b00 RSI: ffffffff8cd9b740 RDI: ffffffff9151ff30 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000293 R13: ffff8880132326c8 R14: ffff888030b52f10 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff888123b6f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1070be0d58 CR3: 000000002a5ba000 CR4: 00000000003526f0 Call Trace: handle_exception drivers/usb/gadget/function/f_mass_storage.c:2549 [inline] fsg_main_thread+0x171e/0x8aa0 drivers/usb/gadget/function/f_mass_storage.c:2587 kthread+0x373/0x450 kernel/kthread.c:436 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 ---------------- Code disassembly (best guess): 0: e5 40 in $0x40,%eax 2: 89 ee mov %ebp,%esi 4: e8 8c 5c 30 fa call 0xfa305c95 9: 40 84 ed test %bpl,%bpl c: 0f 84 35 fe ff ff je 0xfffffe47 12: e9 08 ab 78 f9 jmp 0xf978ab1f 17: e8 69 62 30 fa call 0xfa306285 1c: 48 8d 3d 82 75 76 09 lea 0x9767582(%rip),%rdi # 0x97675a5 23: 48 c7 c6 40 b7 d9 8c mov $0xffffffff8cd9b740,%rsi * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: e9 d6 fd ff ff jmp 0xfffffe0a 34: e8 4c 62 30 fa call 0xfa306285 39: 48 89 da mov %rbx,%rdx 3c: 48 rex.W 3d: b8 .byte 0xb8 Tested on: commit: edc15184 usb: typec: hd3ss3220: Add support for supply.. git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing console output: https://syzkaller.appspot.com/x/log.txt?x=12544749580000 kernel config: https://syzkaller.appspot.com/x/.config?x=ec55b50193b453ea dashboard link: https://syzkaller.appspot.com/bug?extid=a83a5a1ba9ff57935171 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 patch: https://syzkaller.appspot.com/x/patch.diff?x=146bccf9580000