From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f78.google.com (mail-ot1-f78.google.com [209.85.210.78]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F36B71F3BA2 for ; Wed, 28 Jan 2026 00:34:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.78 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769560472; cv=none; b=Qxz6BWcwLOL10sy5gZtW2PHB7iv3BPY7eONEweEe+8Fz7xQCznvCGKjwTYy/NF9I9aEra9L4+KR7UATlVh05iBbhLkXk1E3GgpsVC20snJBA5qhTH7j+UMSh8UvKMH5zDJTcNDHt2kgmZRIQZrHhwfd//eQR9NE448ZFj1kjY2U= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769560472; c=relaxed/simple; bh=1FaoHDaBZwGU+h/zoXrY7rk7sKExFQwTz8rXNpfuUTk=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; 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006d021491bc7-662fc9520b7mr162664eaf.30.1769560469829; Tue, 27 Jan 2026 16:34:29 -0800 (PST) Date: Tue, 27 Jan 2026 16:34:29 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69795995.050a0220.c9109.0028.GAE@google.com> Subject: [syzbot] [usb?] general protection fault in qt2_read_bulk_callback (2) From: syzbot To: gregkh@linuxfoundation.org, johan@kernel.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: 615aad0f61e0 Add linux-next specific files for 20260126 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=1761a05a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=d51c584a7396ddf1 dashboard link: https://syzkaller.appspot.com/bug?extid=c63f59479d561970dc2b compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=145d6bfa580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14dac98a580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/5318e5f027be/disk-615aad0f.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/d165e561fa49/vmlinux-615aad0f.xz kernel image: https://storage.googleapis.com/syzbot-assets/fb0e01c90aa5/bzImage-615aad0f.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c63f59479d561970dc2b@syzkaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000038: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x00000000000001c0-0x00000000000001c7] CPU: 0 UID: 0 PID: 9 Comm: kworker/0:0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026 Workqueue: usb_hub_wq hub_event RIP: 0010:__queue_work+0xa2/0xf90 kernel/workqueue.c:2269 Code: 11 31 ff 89 ee e8 4e f4 37 00 85 ed 0f 85 ef 0c 00 00 e8 01 f0 37 00 4d 8d b7 c0 01 00 00 4c 89 f0 48 c1 e8 03 48 89 44 24 28 <42> 0f b6 04 20 84 c0 0f 85 22 0d 00 00 4c 89 34 24 41 8b 2e 89 ee RSP: 0018:ffffc900000077f8 EFLAGS: 00010002 RAX: 0000000000000038 RBX: 0000000000000008 RCX: ffff88801dafdac0 RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffff88803642c01f R09: 1ffff11006c85803 R10: dffffc0000000000 R11: ffffed1006c85804 R12: dffffc0000000000 R13: ffff88803642c018 R14: 00000000000001c0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881252b4000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fef907e8600 CR3: 000000000e54a000 CR4: 00000000003526f0 Call Trace: queue_work_on+0x106/0x1d0 kernel/workqueue.c:2405 qt2_process_read_urb drivers/usb/serial/quatech2.c:541 [inline] qt2_read_bulk_callback+0xe96/0x1030 drivers/usb/serial/quatech2.c:574 __usb_hcd_giveback_urb+0x376/0x540 drivers/usb/core/hcd.c:1657 dummy_timer+0xbbd/0x45d0 drivers/usb/gadget/udc/dummy_hcd.c:1995 __run_hrtimer kernel/time/hrtimer.c:1785 [inline] __hrtimer_run_queues+0x529/0xc30 kernel/time/hrtimer.c:1849 hrtimer_run_softirq+0x182/0x5a0 kernel/time/hrtimer.c:1866 handle_softirqs+0x22a/0x7c0 kernel/softirq.c:626 __do_softirq kernel/softirq.c:660 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:727 irq_exit_rcu+0x9/0x30 kernel/softirq.c:743 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:lock_acquire+0x221/0x330 kernel/locking/lockdep.c:5872 Code: ff ff ff e8 e1 1d fe 09 f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 fb bd 75 11 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d 88 6b 72 RSP: 0018:ffffc900000e69a0 EFLAGS: 00000286 RAX: 36c2f4075e728c00 RBX: 0000000000000000 RCX: 0000000000000046 RDX: 0000000000000007 RSI: ffffffff8e14e200 RDI: ffffffff8c273e00 RBP: ffffffff821fd99c R08: ffffc900000e67c0 R09: 0000000000000020 R10: ffffc900000e6bd0 R11: ffffffff81a16e20 R12: 0000000000000000 R13: ffffffff8e895dc0 R14: 0000000000000001 R15: 0000000000000246 fs_reclaim_acquire+0x98/0x100 mm/page_alloc.c:4359 might_alloc include/linux/sched/mm.h:317 [inline] slab_pre_alloc_hook mm/slub.c:4403 [inline] slab_alloc_node mm/slub.c:4758 [inline] kmem_cache_alloc_noprof+0x40/0x650 mm/slub.c:4788 radix_tree_node_alloc+0x7e/0x3a0 lib/radix-tree.c:276 idr_get_free+0x2b3/0xa70 lib/radix-tree.c:1506 idr_alloc_u32+0x18d/0x320 lib/idr.c:48 idr_alloc+0x6e/0xd0 lib/idr.c:89 allocate_minors+0x98/0x2b0 drivers/usb/serial/usb-serial.c:95 usb_serial_probe+0x25e7/0x2e50 drivers/usb/serial/usb-serial.c:1137 usb_probe_interface+0x668/0xc90 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x267/0xaf0 drivers/base/dd.c:661 __driver_probe_device+0x18c/0x320 drivers/base/dd.c:803 driver_probe_device+0x4f/0x240 drivers/base/dd.c:833 __device_attach_driver+0x2d4/0x4c0 drivers/base/dd.c:961 bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:500 __device_attach+0x2c5/0x450 drivers/base/dd.c:1033 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1088 bus_probe_device+0x12a/0x220 drivers/base/bus.c:574 device_add+0x7b6/0xb70 drivers/base/core.c:3689 usb_set_configuration+0x1a87/0x2110 drivers/usb/core/message.c:2210 usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250 usb_probe_device+0x1c4/0x3b0 drivers/usb/core/driver.c:291 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x267/0xaf0 drivers/base/dd.c:661 __driver_probe_device+0x18c/0x320 drivers/base/dd.c:803 driver_probe_device+0x4f/0x240 drivers/base/dd.c:833 __device_attach_driver+0x2d4/0x4c0 drivers/base/dd.c:961 bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:500 __device_attach+0x2c5/0x450 drivers/base/dd.c:1033 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1088 bus_probe_device+0x12a/0x220 drivers/base/bus.c:574 device_add+0x7b6/0xb70 drivers/base/core.c:3689 usb_new_device+0xa08/0x16f0 drivers/usb/core/hub.c:2695 hub_port_connect drivers/usb/core/hub.c:5567 [inline] hub_port_connect_change drivers/usb/core/hub.c:5707 [inline] port_event drivers/usb/core/hub.c:5871 [inline] hub_event+0x2a1c/0x4f30 drivers/usb/core/hub.c:5953 process_one_work+0x949/0x15a0 kernel/workqueue.c:3279 process_scheduled_works kernel/workqueue.c:3362 [inline] worker_thread+0xb46/0x1140 kernel/workqueue.c:3443 kthread+0x388/0x470 kernel/kthread.c:467 ret_from_fork+0x51b/0xa40 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:__queue_work+0xa2/0xf90 kernel/workqueue.c:2269 Code: 11 31 ff 89 ee e8 4e f4 37 00 85 ed 0f 85 ef 0c 00 00 e8 01 f0 37 00 4d 8d b7 c0 01 00 00 4c 89 f0 48 c1 e8 03 48 89 44 24 28 <42> 0f b6 04 20 84 c0 0f 85 22 0d 00 00 4c 89 34 24 41 8b 2e 89 ee RSP: 0018:ffffc900000077f8 EFLAGS: 00010002 RAX: 0000000000000038 RBX: 0000000000000008 RCX: ffff88801dafdac0 RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffff88803642c01f R09: 1ffff11006c85803 R10: dffffc0000000000 R11: ffffed1006c85804 R12: dffffc0000000000 R13: ffff88803642c018 R14: 00000000000001c0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881252b4000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fef907e8600 CR3: 000000000e54a000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 31 ff xor %edi,%edi 2: 89 ee mov %ebp,%esi 4: e8 4e f4 37 00 call 0x37f457 9: 85 ed test %ebp,%ebp b: 0f 85 ef 0c 00 00 jne 0xd00 11: e8 01 f0 37 00 call 0x37f017 16: 4d 8d b7 c0 01 00 00 lea 0x1c0(%r15),%r14 1d: 4c 89 f0 mov %r14,%rax 20: 48 c1 e8 03 shr $0x3,%rax 24: 48 89 44 24 28 mov %rax,0x28(%rsp) * 29: 42 0f b6 04 20 movzbl (%rax,%r12,1),%eax <-- trapping instruction 2e: 84 c0 test %al,%al 30: 0f 85 22 0d 00 00 jne 0xd58 36: 4c 89 34 24 mov %r14,(%rsp) 3a: 41 8b 2e mov (%r14),%ebp 3d: 89 ee mov %ebp,%esi --- 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