From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f77.google.com (mail-ot1-f77.google.com [209.85.210.77]) (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 93BF7423148 for ; Tue, 20 Jan 2026 11:33:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.77 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768908810; cv=none; b=Mg+UMadmYhanEPu+qoKu97aS1m6pYJZoEfu91MRqNHqr8G52aWk2UHgXCs2Q6OtVqajQwpf/t3vELraSrkQOIiisbuMF6J6J0b3XvipjHKHKtQjYOYZ1eJ9W+zjOzzcjokYkYgCLO7eHewzi3HGDiSG2brQQlupLc5woI1+RYMY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768908810; c=relaxed/simple; bh=c8OGHlK4BBtriCcGmUNZmXndbqceT2s3iCv3i2RXnEk=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=kd8NUUjCWcydFvP1GgX6YQ7A7wp0HfGe25o+l49nboUYeu3EzGSPn848GMTtYULYp4sLZk4NwsVzL5qJ4QCz/8CQr3EyYJNN1fHWyxJFZB9Aq3BLfnTodtvGh9sa36GPIOgIZXwse3aFVKNepF2WR6mMR0GKr+4fX9nZ2Sb2t8I= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.210.77 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-ot1-f77.google.com with SMTP id 46e09a7af769-7cfd14607b0so9099391a34.0 for ; Tue, 20 Jan 2026 03:33:28 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1768908807; x=1769513607; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=sn9Yh8qMYa4QuWPShr6nGLHX87DgFa+xeRwt2QGLZPU=; b=qzDWwaeARBu1kl+NHxfeNngHJp7co6Eh2FnaLcuIfJWjIY0toxNlBRQJLOX+4dMj+P tTS+To5mT/Y5gsEWIpR1M/hMrRFp4vyUcUHBnYki8dmOFWJt4WxmlGDbCu3yWMxER5r5 MEfYmMqaMEM7GeZ7gAGutjYu3V5RzXmUJQKxinrh2xlncplBQmZed0HG3rII3vLgwHOe 5wJYc8DDEDg443q77cGDBNaIDwqtHac1f9hufHeko1DBuVSVexAp6E1sCuCNCcfCWtKS zW/XH3D9oLFtQ9GvISoqRbPUm1D0ytcq7qAkAkrqzlbfOQzklsv5Ynj54jGBOW9NTMrD ZWMQ== X-Forwarded-Encrypted: i=1; AJvYcCURqwnAAs5qYLjjAGyE+oXovXnlQbVTgjkIdGcKAkuMFa0n5Ig+ob9EqeCbH6l6QNle3ADhqMyA6Ou+biM=@vger.kernel.org X-Gm-Message-State: AOJu0YwVBL1EEAsYWllYUwZeJ/kdcblAI0w0CDL+2ZxICbPROcvxgwjw zmLX2Rnm/dyMmnGHCS4ajbdsfhEaw5Mh83oTc73y67olvAdOYKB38bU20sRnCXTNpJGQ7FNjw7M pxnuWSVVhuq3JdHciN2j0KxI6xHEZAMZFhQ98mNZF7KxPMncmOEoxOWJDIGU= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a4a:bb8a:0:b0:661:1b82:ff3c with SMTP id 006d021491bc7-6611b830a0fmr4025842eaf.18.1768908807464; Tue, 20 Jan 2026 03:33:27 -0800 (PST) Date: Tue, 20 Jan 2026 03:33:27 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <696f6807.050a0220.4cb9c.0010.GAE@google.com> Subject: [syzbot] [usb?] KASAN: slab-use-after-free Read in event_handler 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" Hello, syzbot found the following issue on: HEAD commit: 24d479d26b25 Linux 6.19-rc6 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12d11852580000 kernel config: https://syzkaller.appspot.com/x/.config?x=c33bf4a3a0c7a4f1 dashboard link: https://syzkaller.appspot.com/bug?extid=62c1aa73226b3ac3b107 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/f0555f920605/disk-24d479d2.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/ae277d28fcd2/vmlinux-24d479d2.xz kernel image: https://storage.googleapis.com/syzbot-assets/b4f8db4a51a6/bzImage-24d479d2.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+62c1aa73226b3ac3b107@syzkaller.appspotmail.com vhci_hcd vhci_hcd.15: stop threads vhci_hcd vhci_hcd.15: release socket vhci_hcd vhci_hcd.15: disconnect device vhci_hcd vhci_hcd.15: stop threads vhci_hcd vhci_hcd.15: relea[ 23.071571][ T13] vhci_hcd vhci_hcd.15: release socket vhci_hcd vhci_hcd.15: disconnect device vhci_hcd vhci_hcd.15: stop threads vhci_hcd vhci_hcd.15: release socket vhci_hcd vhci_hcd.15: disconnect device vhci_hcd vhci_hcd.15: stop threads vhci_hcd vhci_hcd.15: release socket vhci_hcd vhci_hcd.15: disconnect device vhci_hcd vhci_hcd.15: stop threads vhci_hcd vhci_hcd.15: release socket vhci_hcd vhci_hcd.15: disconnect device vhci_hcd vhci_hcd.15: stop threads vhci_hcd vhci_hcd.15: release socket vhci_hcd vhci_hcd.15: disconnect device vhci_hcd vhci_hcd.15: stop threads vhci_hcd vhci_hcd.15: release socket vhci_hcd vhci_hcd.15: disconnect device vhci_hcd vhci_hcd.15: stop threads vhci_hcd vhci_hcd.15: release socket vhci_hcd vhci_hcd.15: disconnect device ================================================================== BUG: KASAN: slab-use-after-free in __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] BUG: KASAN: slab-use-after-free in _raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:162 Read of size 1 at addr ffff8881477add10 by task kworker/u8:1/13 CPU: 0 UID: 0 PID: 13 Comm: kworker/u8:1 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Workqueue: usbip_event event_handler Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xba/0x230 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 __kasan_check_byte+0x2a/0x40 mm/kasan/common.c:574 kasan_check_byte include/linux/kasan.h:402 [inline] lock_acquire+0x84/0x330 kernel/locking/lockdep.c:5842 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:162 rt_mutex_slowunlock+0xbf/0x8b0 kernel/locking/rtmutex.c:1417 spin_unlock_irqrestore include/linux/spinlock_rt.h:122 [inline] __wake_up_common_lock+0x18a/0x1e0 kernel/sched/wait.c:127 event_handler+0x3cb/0x4b0 drivers/usb/usbip/usbip_event.c:96 process_one_work kernel/workqueue.c:3257 [inline] process_scheduled_works+0xaec/0x17a0 kernel/workqueue.c:3340 worker_thread+0x89f/0xd90 kernel/workqueue.c:3421 kthread+0x726/0x8b0 kernel/kthread.c:463 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 Allocated by task 1: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5657 [inline] __kmalloc_noprof+0x235/0x7c0 mm/slub.c:5669 kmalloc_noprof include/linux/slab.h:961 [inline] kzalloc_noprof include/linux/slab.h:1094 [inline] __usb_create_hcd+0x67/0x920 drivers/usb/core/hcd.c:2570 vhci_hcd_probe+0x104/0x3f0 drivers/usb/usbip/vhci_hcd.c:1378 platform_probe+0xf9/0x190 drivers/base/platform.c:1446 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x26d/0xac0 drivers/base/dd.c:659 __driver_probe_device+0x18c/0x320 drivers/base/dd.c:801 driver_probe_device+0x4f/0x240 drivers/base/dd.c:831 __device_attach_driver+0x279/0x430 drivers/base/dd.c:959 bus_for_each_drv+0x25b/0x2f0 drivers/base/bus.c:500 __device_attach+0x2c8/0x450 drivers/base/dd.c:1031 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1086 bus_probe_device+0x12d/0x220 drivers/base/bus.c:574 device_add+0x7b6/0xb80 drivers/base/core.c:3689 platform_device_add+0x46a/0x800 drivers/base/platform.c:757 platform_device_register_full+0x46c/0x570 drivers/base/platform.c:885 vhci_hcd_init+0x1e9/0x390 drivers/usb/usbip/vhci_hcd.c:1557 do_one_initcall+0x250/0x840 init/main.c:1378 do_initcall_level+0x104/0x190 init/main.c:1440 do_initcalls+0x59/0xa0 init/main.c:1456 kernel_init_freeable+0x2a6/0x3d0 init/main.c:1688 kernel_init+0x1d/0x1d0 init/main.c:1578 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 Freed by task 1: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2540 [inline] slab_free mm/slub.c:6670 [inline] kfree+0x1bb/0x8f0 mm/slub.c:6878 vhci_hcd_probe+0x258/0x3f0 drivers/usb/usbip/vhci_hcd.c:1415 platform_probe+0xf9/0x190 drivers/base/platform.c:1446 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x26d/0xac0 drivers/base/dd.c:659 __driver_probe_device+0x18c/0x320 drivers/base/dd.c:801 driver_probe_device+0x4f/0x240 drivers/base/dd.c:831 __device_attach_driver+0x279/0x430 drivers/base/dd.c:959 bus_for_each_drv+0x25b/0x2f0 drivers/base/bus.c:500 __device_attach+0x2c8/0x450 drivers/base/dd.c:1031 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1086 bus_probe_device+0x12d/0x220 drivers/base/bus.c:574 device_add+0x7b6/0xb80 drivers/base/core.c:3689 platform_device_add+0x46a/0x800 drivers/base/platform.c:757 platform_device_register_full+0x46c/0x570 drivers/base/platform.c:885 vhci_hcd_init+0x1e9/0x390 drivers/usb/usbip/vhci_hcd.c:1557 do_one_initcall+0x250/0x840 init/main.c:1378 do_initcall_level+0x104/0x190 init/main.c:1440 do_initcalls+0x59/0xa0 init/main.c:1456 kernel_init_freeable+0x2a6/0x3d0 init/main.c:1688 kernel_init+0x1d/0x1d0 init/main.c:1578 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 Last potentially related work creation: kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556 insert_work+0x3d/0x330 kernel/workqueue.c:2180 __queue_work+0xcfd/0xff0 kernel/workqueue.c:2335 queue_work_on+0x106/0x1c0 kernel/workqueue.c:2386 usb_rh_urb_dequeue drivers/usb/core/hcd.c:849 [inline] unlink1+0x34c/0x3f0 drivers/usb/core/hcd.c:1584 usb_hcd_unlink_urb+0xda/0x1d0 drivers/usb/core/hcd.c:1621 usb_kill_urb+0x10b/0x2f0 drivers/usb/core/urb.c:717 hub_quiesce+0x210/0x320 drivers/usb/core/hub.c:1412 hub_suspend+0x7e8/0x9b0 drivers/usb/core/hub.c:4008 usb_suspend_interface drivers/usb/core/driver.c:1323 [inline] usb_suspend_both+0x31f/0x1310 drivers/usb/core/driver.c:1445 usb_runtime_suspend+0x58/0x110 drivers/usb/core/driver.c:1997 __rpm_callback+0x2be/0x7a0 drivers/base/power/runtime.c:406 rpm_callback drivers/base/power/runtime.c:460 [inline] rpm_suspend+0x87d/0x16e0 drivers/base/power/runtime.c:698 __pm_runtime_suspend+0x12c/0x1a0 drivers/base/power/runtime.c:1167 pm_runtime_autosuspend include/linux/pm_runtime.h:415 [inline] usb_runtime_idle+0x76/0x90 drivers/usb/core/driver.c:2034 rpm_idle+0x383/0x8d0 drivers/base/power/runtime.c:550 pm_runtime_work+0x11e/0x1b0 drivers/base/power/runtime.c:995 process_one_work kernel/workqueue.c:3257 [inline] process_scheduled_works+0xaec/0x17a0 kernel/workqueue.c:3340 worker_thread+0x89f/0xd90 kernel/workqueue.c:3421 kthread+0x726/0x8b0 kernel/kthread.c:463 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 Second to last potentially related work creation: kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556 insert_work+0x3d/0x330 kernel/workqueue.c:2180 __queue_work+0xcfd/0xff0 kernel/workqueue.c:2335 queue_work_on+0x106/0x1c0 kernel/workqueue.c:2386 rh_call_control drivers/usb/core/hcd.c:711 [inline] rh_urb_enqueue drivers/usb/core/hcd.c:821 [inline] usb_hcd_submit_urb+0x11db/0x1b50 drivers/usb/core/hcd.c:1542 usb_start_wait_urb+0x12b/0x510 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 get_port_status drivers/usb/core/hub.c:607 [inline] hub_ext_port_status+0x116/0x820 drivers/usb/core/hub.c:624 usb_hub_port_status drivers/usb/core/hub.c:674 [inline] hub_activate+0x6eb/0x1a80 drivers/usb/core/hub.c:1185 process_one_work kernel/workqueue.c:3257 [inline] process_scheduled_works+0xaec/0x17a0 kernel/workqueue.c:3340 worker_thread+0x89f/0xd90 kernel/workqueue.c:3421 kthread+0x726/0x8b0 kernel/kthread.c:463 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 The buggy address belongs to the object at ffff8881477ac000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 7440 bytes inside of freed 8192-byte region [ffff8881477ac000, ffff8881477ae000) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1477a8 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x500000000000040(head|node=1|zone=2) page_type: f5(slab) raw: 0500000000000040 ffff88813fe27280 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000 head: 0500000000000040 ffff88813fe27280 dead000000000122 0000000000000000 head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000 head: 0500000000000003 ffffea00051dea01 00000000ffffffff 00000000ffffffff head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 22636347125, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x228/0x280 mm/page_alloc.c:1884 prep_new_page mm/page_alloc.c:1892 [inline] get_page_from_freelist+0x28bb/0x2950 mm/page_alloc.c:3945 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5240 alloc_pages_mpol+0xd1/0x380 mm/mempolicy.c:2486 alloc_slab_page mm/slub.c:3075 [inline] allocate_slab+0x86/0x3a0 mm/slub.c:3248 new_slab mm/slub.c:3302 [inline] ___slab_alloc+0xaf8/0x13d0 mm/slub.c:4656 __slab_alloc+0xc5/0x1f0 mm/slub.c:4779 __slab_alloc_node mm/slub.c:4855 [inline] slab_alloc_node mm/slub.c:5251 [inline] __do_kmalloc_node mm/slub.c:5656 [inline] __kmalloc_noprof+0x15e/0x7c0 mm/slub.c:5669 kmalloc_noprof include/linux/slab.h:961 [inline] kzalloc_noprof include/linux/slab.h:1094 [inline] __usb_create_hcd+0x67/0x920 drivers/usb/core/hcd.c:2570 vhci_hcd_probe+0x1e6/0x3f0 drivers/usb/usbip/vhci_hcd.c:1394 platform_probe+0xf9/0x190 drivers/base/platform.c:1446 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x26d/0xac0 drivers/base/dd.c:659 __driver_probe_device+0x18c/0x320 drivers/base/dd.c:801 driver_probe_device+0x4f/0x240 drivers/base/dd.c:831 __device_attach_driver+0x279/0x430 drivers/base/dd.c:959 bus_for_each_drv+0x25b/0x2f0 drivers/base/bus.c:500 page_owner free stack trace missing Memory state around the buggy address: ffff8881477adc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881477adc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881477add00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881477add80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881477ade00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- 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 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