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2002:a05:6808:1493:b0:4d6:9133:cfe2 with SMTP id 5614622812f47-4faaf252cc0mr4967039b6e.39.1791374429738; Wed, 07 Oct 2026 05:00:29 -0700 (PDT) Date: Wed, 07 Oct 2026 05:00:29 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6ac6345d.d03902a3.74d6f.0006.GAE@google.com> Subject: [syzbot] [usb?] BUG: unable to handle kernel paging request in usb_driver_release_interface From: syzbot To: dakr@kernel.org, driver-core@lists.linux.dev, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, rafael@kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 602042bf29f6 Merge tag 'wq-for-7.3-rc6-fixes' of git://git.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=155ae00d580000 kernel config: https://syzkaller.appspot.com/x/.config?x=929e4854a828f434 dashboard link: https://syzkaller.appspot.com/bug?extid=863936f50214e843ae0c compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10bd6715580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14ae21c9580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-602042bf.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/c804d2e9b640/vmlinux-602042bf.xz kernel image: https://storage.googleapis.com/syzbot-assets/d6cd162ae59e/bzImage-602042bf.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+863936f50214e843ae0c@syzkaller.appspotmail.com wwan wwan1: port wwan1mbim0 disconnected Oops: general protection fault, probably for non-canonical address 0xdffffc000000000b: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000058-0x000000000000005f] CPU: 0 UID: 0 PID: 9 Comm: kworker/0:0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Workqueue: usb_hub_wq hub_event RIP: 0010:klist_put+0x4d/0x1d0 lib/klist.c:212 Code: c1 ea 03 80 3c 02 00 0f 85 74 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 23 49 83 e4 fe 49 8d 7c 24 58 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 43 01 00 00 4c 89 e7 4d 8b 74 24 58 e8 cc ef 0c RSP: 0018:ffffc900000c7450 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff888035673c80 RCX: 0000000000000000 RDX: 000000000000000b RSI: ffffffff8bc8e645 RDI: 0000000000000058 RBP: 0000000000000001 R08: 0000000000000000 R09: fffffbfff224ec84 R10: ffffffff91276423 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000001 R14: ffffffff912763e0 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880d5b4e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffcc2839000 CR3: 000000003938c000 CR4: 0000000000352ef0 Call Trace: klist_del lib/klist.c:230 [inline] klist_remove+0x14c/0x2e0 lib/klist.c:249 __device_release_driver drivers/base/dd.c:1357 [inline] device_release_driver_internal+0x4fb/0x620 drivers/base/dd.c:1372 usb_driver_release_interface+0x10e/0x190 drivers/usb/core/driver.c:643 cdc_ncm_unbind+0x2ac/0x350 drivers/net/usb/cdc_ncm.c:1019 usbnet_disconnect+0x1e2/0x300 drivers/net/usb/usbnet.c:1692 usb_unbind_interface+0x1dd/0x9e0 drivers/usb/core/driver.c:461 device_remove drivers/base/dd.c:618 [inline] device_remove+0x12a/0x180 drivers/base/dd.c:610 __device_release_driver drivers/base/dd.c:1349 [inline] device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372 bus_remove_device+0x2bc/0x560 drivers/base/bus.c:664 device_del+0x376/0x9b0 drivers/base/core.c:3965 usb_disable_device+0x367/0x810 drivers/usb/core/message.c:1484 usb_disconnect+0x2e2/0x9a0 drivers/usb/core/hub.c:2355 hub_port_connect drivers/usb/core/hub.c:5425 [inline] hub_port_connect_change drivers/usb/core/hub.c:5725 [inline] port_event drivers/usb/core/hub.c:5889 [inline] hub_event+0x1bb1/0x4420 drivers/usb/core/hub.c:5971 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396 process_scheduled_works kernel/workqueue.c:3479 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560 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 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:klist_put+0x4d/0x1d0 lib/klist.c:212 Code: c1 ea 03 80 3c 02 00 0f 85 74 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 23 49 83 e4 fe 49 8d 7c 24 58 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 43 01 00 00 4c 89 e7 4d 8b 74 24 58 e8 cc ef 0c RSP: 0018:ffffc900000c7450 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff888035673c80 RCX: 0000000000000000 RDX: 000000000000000b RSI: ffffffff8bc8e645 RDI: 0000000000000058 RBP: 0000000000000001 R08: 0000000000000000 R09: fffffbfff224ec84 R10: ffffffff91276423 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000001 R14: ffffffff912763e0 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880d5b4e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055557a2d0a28 CR3: 000000002c457000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: c1 ea 03 shr $0x3,%edx 3: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 7: 0f 85 74 01 00 00 jne 0x181 d: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 14: fc ff df 17: 4c 8b 23 mov (%rbx),%r12 1a: 49 83 e4 fe and $0xfffffffffffffffe,%r12 1e: 49 8d 7c 24 58 lea 0x58(%r12),%rdi 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 43 01 00 00 jne 0x177 34: 4c 89 e7 mov %r12,%rdi 37: 4d 8b 74 24 58 mov 0x58(%r12),%r14 3c: e8 .byte 0xe8 3d: cc int3 3e: ef out %eax,(%dx) 3f: 0c .byte 0xc --- 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