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AKwUvBwYKchb4f3/8Cbkf5gxOsVZCFT+tq5C4X5+FvoO3sxyIyTWDiJQAvJRajjztoIBV0G8VgrXpaE0vGR8jWY=@vger.kernel.org X-Gm-Message-State: AFuF++nSORNI8CPRvehCL47Wzuj5x9ol1NsDB1HbUQaMou0tQJgvLVvw cmrt0TIzzayZJPsGAfYqT9dVeg67/4yS0OBZEyl9pTljCRdh//1Yo5AyI94mIX2jpPQ7rJNoLVe cKQN08Xv/zfv+kS1fJgWsosBD10Waz/dnm18IKidYbKrnFWClFFF42xdIXKs= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:810a:b0:6b1:bdd9:453 with SMTP id 006d021491bc7-6b6faee1fa2mr8281763eaf.12.1788595947205; Sat, 05 Sep 2026 01:12:27 -0700 (PDT) Date: Sat, 05 Sep 2026 01:12:27 -0700 In-Reply-To: <6a88066b.ae6ddae5.3da009.002d.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a9bceeb.a5e650b3.26d8a.0008.GAE@google.com> Subject: Re: [syzbot] [usb?] general protection fault in vhci_hcd_probe From: syzbot To: gregkh@linuxfoundation.org, i@zenithal.me, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, shuah@kernel.org, syzkaller-bugs@googlegroups.com, valentina.manea.m@gmail.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: 9d80aa4617b3 Add linux-next specific files for 20260903 git tree: git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git console output: https://syzkaller.appspot.com/x/log.txt?x=10adf4f9580000 kernel config: https://syzkaller.appspot.com/x/.config?x=bb4a32c282cc2ec7 dashboard link: https://syzkaller.appspot.com/bug?extid=7300affe388249d66dfe compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=121c7215580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+7300affe388249d66dfe@syzkaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 UID: 0 PID: 6482 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:vhci_hcd_probe+0x47/0x3e0 drivers/usb/usbip/vhci_hcd.c:1367 Code: 0f ee e4 f9 49 8d 9e 80 00 00 00 48 89 d8 48 c1 e8 03 80 3c 28 00 74 08 48 89 df e8 13 17 55 fa 48 8b 1b 48 89 d8 48 c1 e8 03 <80> 3c 28 00 74 08 48 89 df e8 fb 16 55 fa 4c 8b 23 48 c7 c0 80 6c RSP: 0018:ffffc900033c7ac0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888076a89f40 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88801c7a6000 RBP: dffffc0000000000 R08: ffff88802af3ba53 R09: 1ffff110055e774a R10: dffffc0000000000 R11: ffffffff87e2e6c0 R12: ffff88801c7a6000 R13: ffffffff8fc7ad20 R14: ffff88801c7a6000 R15: ffffffff87e2e6c0 FS: 00007f21f99fe6c0(0000) GS:ffff888124dc0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f21fa270000 CR3: 000000007f704000 CR4: 00000000003526f0 Call Trace: platform_probe+0xf9/0x190 drivers/base/platform.c:1507 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x254/0xae0 drivers/base/dd.c:706 __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868 device_driver_attach+0xe0/0x1d0 drivers/base/dd.c:1203 bind_store+0x1d0/0x220 drivers/base/bus.c:267 kernfs_fop_write_iter+0x3a4/0x540 fs/kernfs/file.c:345 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x612/0xba0 fs/read_write.c:687 ksys_write+0x150/0x270 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f21fa39e0d9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f21f99fe028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f21fa625fa0 RCX: 00007f21fa39e0d9 RDX: 0000000000000006 RSI: 00002000000000c0 RDI: 0000000000000004 RBP: 00007f21fa435024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f21fa626038 R14: 00007f21fa625fa0 R15: 00007fff742f7888 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:vhci_hcd_probe+0x47/0x3e0 drivers/usb/usbip/vhci_hcd.c:1367 Code: 0f ee e4 f9 49 8d 9e 80 00 00 00 48 89 d8 48 c1 e8 03 80 3c 28 00 74 08 48 89 df e8 13 17 55 fa 48 8b 1b 48 89 d8 48 c1 e8 03 <80> 3c 28 00 74 08 48 89 df e8 fb 16 55 fa 4c 8b 23 48 c7 c0 80 6c RSP: 0018:ffffc900033c7ac0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888076a89f40 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88801c7a6000 RBP: dffffc0000000000 R08: ffff88802af3ba53 R09: 1ffff110055e774a R10: dffffc0000000000 R11: ffffffff87e2e6c0 R12: ffff88801c7a6000 R13: ffffffff8fc7ad20 R14: ffff88801c7a6000 R15: ffffffff87e2e6c0 FS: 00007f21f99fe6c0(0000) GS:ffff888124cc0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b34124008 CR3: 000000007f704000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 0f ee e4 pmaxsw %mm4,%mm4 3: f9 stc 4: 49 8d 9e 80 00 00 00 lea 0x80(%r14),%rbx b: 48 89 d8 mov %rbx,%rax e: 48 c1 e8 03 shr $0x3,%rax 12: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1) 16: 74 08 je 0x20 18: 48 89 df mov %rbx,%rdi 1b: e8 13 17 55 fa call 0xfa551733 20: 48 8b 1b mov (%rbx),%rbx 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 48 89 df mov %rbx,%rdi 33: e8 fb 16 55 fa call 0xfa551733 38: 4c 8b 23 mov (%rbx),%r12 3b: 48 rex.W 3c: c7 .byte 0xc7 3d: c0 .byte 0xc0 3e: 80 .byte 0x80 3f: 6c insb (%dx),%es:(%rdi) --- 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.