From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f205.google.com (mail-oi1-f205.google.com [209.85.167.205]) (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 BD3DA23393F for ; Sat, 1 Aug 2026 00:01:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.205 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785542498; cv=none; b=e3vTPpFG0REvvl3NTSMvsQGdq2GAkwQtouITqRhzDbHsRP3ir09vU/UqS54THNDmdfmJAfJ4TwGp9Vn+AZY0iQN7Lqsak4wcdSCvuwMKSTw4Y7ERgf8jUtdmofLJxVO9tfqWflpd39QLlXhp8lhAQ5x5Hz1Dotlt75U2tzM8MtA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785542498; c=relaxed/simple; bh=OFBG12L5clhw4gwYLB+RXBhuhfTPhHqVAvxYjKWfMw4=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; 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2002:a05:6820:16a4:b0:6ac:a994:8794 with SMTP id 006d021491bc7-6ae4317b7f1mr3864142eaf.7.1785542494889; Fri, 31 Jul 2026 17:01:34 -0700 (PDT) Date: Fri, 31 Jul 2026 17:01:34 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a6d375e.2d659fcc.1d46f5.01a4.GAE@google.com> Subject: [syzbot] [usb?] KASAN: slab-use-after-free Read in vhci_shutdown_connection 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: f5098b6bae76 Linux 7.2-rc5 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11b391b9580000 kernel config: https://syzkaller.appspot.com/x/.config?x=4e38b15c29e6a1d9 dashboard link: https://syzkaller.appspot.com/bug?extid=31117fde582fe6a0cd62 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1575d1b9580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/7d76d25427fa/disk-f5098b6b.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/b2a3f9e7cb3e/vmlinux-f5098b6b.xz kernel image: https://storage.googleapis.com/syzbot-assets/e4d49cdcd799/bzImage-f5098b6b.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+31117fde582fe6a0cd62@syzkaller.appspotmail.com vhci_hcd vhci_hcd.0: disconnect device vhci_hcd vhci_hcd.0: stop threads ================================================================== BUG: KASAN: slab-use-after-free in vhci_shutdown_connection+0x1d4/0x650 drivers/usb/usbip/vhci_hcd.c:1062 Read of size 8 at addr ffff888020bd1560 by task kworker/u8:9/1170 CPU: 1 UID: 0 PID: 1170 Comm: kworker/u8:9 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 Workqueue: usbip_event event_handler Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description+0x55/0x1e0 mm/kasan/report.c:378 print_report+0x58/0x70 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 vhci_shutdown_connection+0x1d4/0x650 drivers/usb/usbip/vhci_hcd.c:1062 event_handler+0x2a4/0x4b0 drivers/usb/usbip/usbip_event.c:79 process_one_work kernel/workqueue.c:3322 [inline] process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 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:5334 [inline] __kmalloc_noprof+0x375/0x720 mm/slub.c:5359 _kmalloc_noprof include/linux/slab.h:992 [inline] _kzalloc_noprof include/linux/slab.h:1309 [inline] __usb_create_hcd+0x67/0x900 drivers/usb/core/hcd.c:2566 vhci_hcd_probe+0x104/0x3e0 drivers/usb/usbip/vhci_hcd.c:1378 platform_probe+0xf9/0x190 drivers/base/platform.c:1439 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 driver_probe_device+0x4f/0x240 drivers/base/dd.c:898 __device_attach_driver+0x270/0x410 drivers/base/dd.c:1026 bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:500 __device_attach+0x2c4/0x450 drivers/base/dd.c:1098 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1153 bus_probe_device+0x12a/0x220 drivers/base/bus.c:620 device_add+0x7d7/0xb80 drivers/base/core.c:3772 platform_device_add+0x4bd/0x860 drivers/base/platform.c:762 platform_device_register_full+0x62d/0x710 drivers/base/platform.c:902 vhci_hcd_init+0x227/0x360 drivers/usb/usbip/vhci_hcd.c:1557 do_one_initcall+0x250/0x870 init/main.c:1347 do_initcall_level+0x10a/0x1a0 init/main.c:1409 do_initcalls+0x59/0xa0 init/main.c:1425 kernel_init_freeable+0x29d/0x3e0 init/main.c:1658 kernel_init+0x1d/0x1d0 init/main.c:1548 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Freed by task 6083: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x40/0x50 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:2677 [inline] slab_free mm/slub.c:6377 [inline] kfree+0x1c5/0x640 mm/slub.c:6692 vhci_hcd_remove+0xe4/0x110 drivers/usb/usbip/vhci_hcd.c:1434 device_remove drivers/base/dd.c:616 [inline] __device_release_driver drivers/base/dd.c:1349 [inline] device_release_driver_internal+0x48b/0x880 drivers/base/dd.c:1372 unbind_store+0x1a1/0x1d0 drivers/base/bus.c:244 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:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f 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:2226 __queue_work+0xcd8/0x10a0 kernel/workqueue.c:2401 queue_work_on+0x106/0x1d0 kernel/workqueue.c:2452 usb_rh_urb_dequeue drivers/usb/core/hcd.c:845 [inline] unlink1+0x344/0x3e0 drivers/usb/core/hcd.c:1580 usb_hcd_unlink_urb+0xe6/0x1e0 drivers/usb/core/hcd.c:1617 usb_kill_urb+0x10b/0x2f0 drivers/usb/core/urb.c:716 hub_quiesce+0x211/0x330 drivers/usb/core/hub.c:1412 hub_suspend+0x904/0xad0 drivers/usb/core/hub.c:4008 usb_suspend_interface drivers/usb/core/driver.c:1323 [inline] usb_suspend_both+0x285/0x1040 drivers/usb/core/driver.c:1446 usb_runtime_suspend+0x58/0x110 drivers/usb/core/driver.c:2000 __rpm_callback+0x2c7/0x950 drivers/base/power/runtime.c:406 rpm_callback drivers/base/power/runtime.c:460 [inline] rpm_suspend+0x8a0/0x17b0 drivers/base/power/runtime.c:698 __pm_runtime_suspend+0x12f/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:2037 rpm_idle+0x5b4/0x980 drivers/base/power/runtime.c:550 pm_runtime_work+0x11e/0x1b0 drivers/base/power/runtime.c:995 process_one_work kernel/workqueue.c:3322 [inline] process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 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:2226 __queue_work+0xcd8/0x10a0 kernel/workqueue.c:2401 queue_work_on+0x106/0x1d0 kernel/workqueue.c:2452 rh_call_control drivers/usb/core/hcd.c:706 [inline] rh_urb_enqueue drivers/usb/core/hcd.c:817 [inline] usb_hcd_submit_urb+0xa3b/0x1b60 drivers/usb/core/hcd.c:1538 usb_start_wait_urb+0x13f/0x5b0 drivers/usb/core/message.c:62 usb_internal_control_msg drivers/usb/core/message.c:117 [inline] usb_control_msg+0x234/0x3e0 drivers/usb/core/message.c:167 get_port_status drivers/usb/core/hub.c:607 [inline] hub_ext_port_status+0x114/0x810 drivers/usb/core/hub.c:624 usb_hub_port_status drivers/usb/core/hub.c:674 [inline] hub_activate+0x740/0x1b20 drivers/usb/core/hub.c:1185 process_one_work kernel/workqueue.c:3322 [inline] process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 The buggy address belongs to the object at ffff888020bd0000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 5472 bytes inside of freed 8192-byte region [ffff888020bd0000, ffff888020bd2000) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x20bd0 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801b005280 dead000000000100 dead000000000122 raw: 0000000000000000 0000000800020002 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801b005280 dead000000000100 dead000000000122 head: 0000000000000000 0000000800020002 00000000f5000000 0000000000000000 head: 00fff00000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 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 10, tgid 10 (kworker/0:1), ts 3790461764, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1859 prep_new_page mm/page_alloc.c:1867 [inline] get_page_from_freelist+0x21fa/0x2270 mm/page_alloc.c:3946 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5304 alloc_slab_page mm/slub.c:3266 [inline] allocate_slab+0x79/0x5e0 mm/slub.c:3380 new_slab mm/slub.c:3426 [inline] refill_objects+0x2d5/0x350 mm/slub.c:7310 refill_sheaf mm/slub.c:2804 [inline] __pcs_replace_empty_main+0x2bf/0x6b0 mm/slub.c:4675 alloc_from_pcs mm/slub.c:4773 [inline] slab_alloc_node mm/slub.c:4905 [inline] __do_kmalloc_node mm/slub.c:5333 [inline] __kmalloc_noprof+0x485/0x720 mm/slub.c:5359 _kmalloc_noprof include/linux/slab.h:992 [inline] acpi_ut_initialize_buffer+0xca/0x170 drivers/acpi/acpica/utalloc.c:-1 acpi_rs_create_pci_routing_table+0x1c0/0xd90 drivers/acpi/acpica/rscreate.c:212 acpi_rs_get_prt_method_data+0xdf/0x150 drivers/acpi/acpica/rsutils.c:456 acpi_get_irq_routing_table+0x98/0xe0 drivers/acpi/acpica/rsxface.c:137 acpi_pci_irq_find_prt_entry+0x163/0x1040 drivers/acpi/pci_irq.c:215 acpi_pci_irq_lookup+0x45/0x690 drivers/acpi/pci_irq.c:299 acpi_pci_irq_enable+0x1ee/0x7a0 drivers/acpi/pci_irq.c:414 do_pci_enable_device+0x26f/0x4a0 drivers/pci/pci.c:1998 pci_enable_device_flags+0x5ab/0x700 drivers/pci/pci.c:2089 page_owner free stack trace missing Memory state around the buggy address: ffff888020bd1400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888020bd1480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888020bd1500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888020bd1580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888020bd1600: 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 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