From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f208.google.com (mail-oi1-f208.google.com [209.85.167.208]) (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 AEA693CB56C for ; Mon, 27 Jul 2026 19:56:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.208 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785182203; cv=none; b=Z1oF4yqNIlPJ+Dq67QqTUKcbQzfJnwVmoc7eT8TkewPgbP0FixZeRURMGwqZ1f90wR4mDPsfkDmwqVN7mrrFj+121dtRlXH8LmFQ7NC7CvFIFF7BwubfoQxEE7Z+/GMIE3pnBP5K7ORI647gLAqfvM4q1wIqlVezEOLyXIA2XSI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785182203; c=relaxed/simple; bh=OejF7urEx6fi5rHgujaXsJqa3K73sQFacqf8sOdXYRE=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; 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:mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to:content-type; bh=N4uEZzUeSpl5X8VLPcVbObuW12/Ujw7zQJ/fMctxC7o=; b=eANbh+8mWYVqs1JY7CNELd5RsRHYEypOoZ3dXheovxqQvSQuAVolMJ1xne1vt0zq8c S2B9wMU9pDit+lfG540WjTLCc2HjkIogqGfeQUK1S84qJt4OPngaG53jBTlk9VFx+Kek 2U6LfBGgEYxIwuHm92MGbbb/xfIAxQQpq4AaJbMypL0E9TbcwGV4MCC9rmFJogWy2Y3T AJmYdqiTTnx0NxfmGaV/4GYdw8yYQvIl4GXHUbLwaJRKwrmJfYnq/7iJY+DMuu5ji9lw 7g4FM3HDRI6bSFGoOQRkY+wxn1DyaaeYdGocBwdZIh5Gw1/QNMPvcKMciBQg01FnG+gD n4Jw== X-Forwarded-Encrypted: i=1; AHgh+Rpp1ZCdREnCIRMAEPRenykwvSClrHo5ldprRPsA+B3RYsBpFXMly85KsPZoFCfR2B8wynx5sCUvEmI=@vger.kernel.org X-Gm-Message-State: AOJu0YzdyQJmiszxgmKBa1oqAJcOdhsNeD7kRJ8aTS0NANr55f9P/JuZ +lMF2LMB8kGrTqb2bmqfRiElcztIYgNuxAV6oDmUHIXUz+iM3rT/f+O0O2KSv0fYagWotiJFYvL 98UaOxCcs2/8tt6xO7/PJdLjvEy6QZnHbreoJWxwaKduXzRPdhpK0hMCkdxk= Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:1797:b0:497:d3d6:6a40 with SMTP id 5614622812f47-4ab69f50fd5mr8988957b6e.3.1785182200657; Mon, 27 Jul 2026 12:56:40 -0700 (PDT) Date: Mon, 27 Jul 2026 12:56:40 -0700 In-Reply-To: <696f6807.050a0220.4cb9c.0010.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a67b7f8.a2ea2cc8.fbad6.0057.GAE@google.com> Subject: Re: [syzbot] [usb?] KASAN: slab-use-after-free Read in event_handler From: syzbot To: gregkh@linuxfoundation.org, halves@igalia.com, i@zenithal.me, kernel-dev@igalia.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, nobuo.iwata@fujixerox.co.jp, shuah@kernel.org, stable@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: f5098b6bae76 Linux 7.2-rc5 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16fa67b1580000 kernel config: https://syzkaller.appspot.com/x/.config?x=145fa60d73086782 dashboard link: https://syzkaller.appspot.com/bug?extid=62c1aa73226b3ac3b107 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=13ce7fde580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=179c16b9580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-f5098b6b.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/5cb9b4ace7bc/vmlinux-f5098b6b.xz kernel image: https://storage.googleapis.com/syzbot-assets/2b85acfa194b/bzImage-f5098b6b.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.0: disconnect device ================================================================== BUG: KASAN: slab-use-after-free in __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline] BUG: KASAN: slab-use-after-free in _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:166 Read of size 1 at addr ffff8880551a94a8 by task kworker/u32:2/5599 CPU: 2 UID: 0 PID: 5599 Comm: kworker/u32:2 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: usbip_event event_handler Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x13d/0x4b0 mm/kasan/report.c:482 kasan_report+0xdf/0x1c0 mm/kasan/report.c:595 __kasan_check_byte+0x36/0x50 mm/kasan/common.c:574 kasan_check_byte include/linux/kasan.h:402 [inline] lock_acquire kernel/locking/lockdep.c:5842 [inline] lock_acquire+0x132/0x370 kernel/locking/lockdep.c:5825 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:166 unset_event drivers/usb/usbip/usbip_event.c:35 [inline] event_handler+0x21e/0x570 drivers/usb/usbip/usbip_event.c:80 process_one_work+0xa23/0x1940 kernel/workqueue.c:3322 process_scheduled_works kernel/workqueue.c:3405 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Allocated by task 13421: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5334 [inline] __kmalloc_noprof+0x322/0x820 mm/slub.c:5359 _kmalloc_noprof include/linux/slab.h:992 [inline] _kzalloc_noprof include/linux/slab.h:1309 [inline] __usb_create_hcd+0x5e/0xac0 drivers/usb/core/hcd.c:2566 vhci_hcd_probe+0xf3/0x4e0 drivers/usb/usbip/vhci_hcd.c:1378 platform_probe+0x106/0x1d0 drivers/base/platform.c:1439 call_driver_probe drivers/base/dd.c:628 [inline] really_probe+0x241/0xa60 drivers/base/dd.c:706 __driver_probe_device+0x20e/0x450 drivers/base/dd.c:868 device_driver_attach+0xd1/0x220 drivers/base/dd.c:1203 bind_store+0xf4/0x190 drivers/base/bus.c:267 drv_attr_store+0x74/0xb0 drivers/base/bus.c:125 sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145 kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x6ac/0x1050 fs/read_write.c:687 ksys_write+0x12a/0x250 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 13423: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5f/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+0x22b/0x6c0 mm/slub.c:6692 hcd_release drivers/usb/core/hcd.c:2690 [inline] kref_put include/linux/kref.h:65 [inline] usb_put_hcd drivers/usb/core/hcd.c:2704 [inline] usb_put_hcd+0x149/0x1f0 drivers/usb/core/hcd.c:2701 vhci_hcd_remove+0x107/0x1b0 drivers/usb/usbip/vhci_hcd.c:1434 platform_remove+0x5f/0x80 drivers/base/platform.c:1456 device_remove+0xcb/0x180 drivers/base/dd.c:616 __device_release_driver drivers/base/dd.c:1349 [inline] device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372 unbind_store+0xf8/0x110 drivers/base/bus.c:244 drv_attr_store+0x74/0xb0 drivers/base/bus.c:125 sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145 kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x6ac/0x1050 fs/read_write.c:687 ksys_write+0x12a/0x250 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Last potentially related work creation: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_record_aux_stack+0xa7/0xc0 mm/kasan/generic.c:556 insert_work+0x36/0x230 kernel/workqueue.c:2226 __queue_work+0x9bc/0x12b0 kernel/workqueue.c:2401 queue_work_on+0x1a9/0x1e0 kernel/workqueue.c:2452 queue_work include/linux/workqueue.h:699 [inline] usb_hcd_giveback_urb+0x330/0x4a0 drivers/usb/core/hcd.c:1758 usb_rh_urb_dequeue drivers/usb/core/hcd.c:845 [inline] unlink1+0x418/0x510 drivers/usb/core/hcd.c:1580 usb_hcd_unlink_urb+0x131/0x210 drivers/usb/core/hcd.c:1617 usb_kill_urb drivers/usb/core/urb.c:716 [inline] usb_kill_urb+0x121/0x320 drivers/usb/core/urb.c:703 hub_quiesce+0x1e9/0x320 drivers/usb/core/hub.c:1412 hub_suspend+0x4ab/0x9e0 drivers/usb/core/hub.c:4008 usb_suspend_interface drivers/usb/core/driver.c:1323 [inline] usb_suspend_both+0x288/0x950 drivers/usb/core/driver.c:1446 usb_runtime_suspend+0x49/0x120 drivers/usb/core/driver.c:2000 __rpm_callback+0xc8/0x620 drivers/base/power/runtime.c:406 rpm_callback+0x16a/0x1b0 drivers/base/power/runtime.c:460 rpm_suspend+0x2f4/0x11a0 drivers/base/power/runtime.c:698 __pm_runtime_suspend+0xba/0x1a0 drivers/base/power/runtime.c:1167 pm_runtime_put_sync_autosuspend include/linux/pm_runtime.h:740 [inline] usb_new_device.cold+0xd61/0x115c drivers/usb/core/hub.c:2727 register_root_hub+0x4e6/0x639 drivers/usb/core/hcd.c:990 usb_add_hcd.cold+0xccd/0x1158 drivers/usb/core/hcd.c:2987 vhci_hcd_probe+0x14b/0x4e0 drivers/usb/usbip/vhci_hcd.c:1388 platform_probe+0x106/0x1d0 drivers/base/platform.c:1439 call_driver_probe drivers/base/dd.c:628 [inline] really_probe+0x241/0xa60 drivers/base/dd.c:706 __driver_probe_device+0x20e/0x450 drivers/base/dd.c:868 device_driver_attach+0xd1/0x220 drivers/base/dd.c:1203 bind_store+0xf4/0x190 drivers/base/bus.c:267 drv_attr_store+0x74/0xb0 drivers/base/bus.c:125 sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145 kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x6ac/0x1050 fs/read_write.c:687 ksys_write+0x12a/0x250 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Second to last potentially related work creation: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_record_aux_stack+0xa7/0xc0 mm/kasan/generic.c:556 insert_work+0x36/0x230 kernel/workqueue.c:2226 __queue_work+0x9bc/0x12b0 kernel/workqueue.c:2401 queue_work_on+0x1a9/0x1e0 kernel/workqueue.c:2452 queue_work include/linux/workqueue.h:699 [inline] usb_hcd_giveback_urb+0x3b8/0x4a0 drivers/usb/core/hcd.c:1760 rh_call_control drivers/usb/core/hcd.c:706 [inline] rh_urb_enqueue drivers/usb/core/hcd.c:817 [inline] usb_hcd_submit_urb+0xab7/0x2150 drivers/usb/core/hcd.c:1538 usb_submit_urb+0x827/0x19b0 drivers/usb/core/urb.c:586 usb_start_wait_urb+0x10e/0x580 drivers/usb/core/message.c:62 usb_internal_control_msg drivers/usb/core/message.c:117 [inline] usb_control_msg+0x328/0x4b0 drivers/usb/core/message.c:167 get_port_status drivers/usb/core/hub.c:607 [inline] hub_ext_port_status+0x152/0x600 drivers/usb/core/hub.c:624 usb_hub_port_status drivers/usb/core/hub.c:674 [inline] hub_activate+0x6e5/0x1c40 drivers/usb/core/hub.c:1185 process_one_work+0xa23/0x1940 kernel/workqueue.c:3322 process_scheduled_works kernel/workqueue.c:3405 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x72b/0xd50 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 ffff8880551a8000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 5288 bytes inside of freed 8192-byte region [ffff8880551a8000, ffff8880551aa000) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x551a8 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 ffff88801bc43180 dead000000000100 dead000000000122 raw: 0000000000000000 0000000800020002 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801bc43180 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 13322, tgid 13320 (syz.1.2421), ts 499968291131, free_ts 263312866515 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1859 prep_new_page mm/page_alloc.c:1867 [inline] get_page_from_freelist+0xf48/0x3530 mm/page_alloc.c:3946 __alloc_frozen_pages_noprof+0x299/0x2dc0 mm/page_alloc.c:5304 alloc_slab_page mm/slub.c:3266 [inline] allocate_slab mm/slub.c:3380 [inline] new_slab+0xa2/0x640 mm/slub.c:3426 refill_objects+0xe3/0x410 mm/slub.c:7310 refill_sheaf mm/slub.c:2804 [inline] __pcs_replace_empty_main+0x376/0x680 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+0x66d/0x820 mm/slub.c:5359 _kmalloc_noprof include/linux/slab.h:992 [inline] _kzalloc_noprof include/linux/slab.h:1309 [inline] __usb_create_hcd+0x5e/0xac0 drivers/usb/core/hcd.c:2566 vhci_hcd_probe+0x1a5/0x4e0 drivers/usb/usbip/vhci_hcd.c:1394 platform_probe+0x106/0x1d0 drivers/base/platform.c:1439 call_driver_probe drivers/base/dd.c:628 [inline] really_probe+0x241/0xa60 drivers/base/dd.c:706 __driver_probe_device+0x20e/0x450 drivers/base/dd.c:868 device_driver_attach+0xd1/0x220 drivers/base/dd.c:1203 bind_store+0xf4/0x190 drivers/base/bus.c:267 drv_attr_store+0x74/0xb0 drivers/base/bus.c:125 sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145 page last free pid 37 tgid 37 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1406 [inline] __free_frozen_pages+0x79f/0x1090 mm/page_alloc.c:2950 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x47/0xf0 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x1a0/0x1f0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4584 [inline] slab_alloc_node mm/slub.c:4917 [inline] kmem_cache_alloc_noprof+0x26b/0x6a0 mm/slub.c:4931 alloc_filename fs/namei.c:147 [inline] do_getname_kernel+0x5d/0x250 fs/namei.c:266 getname_kernel fs/namei.c:289 [inline] class_filename_kernel_constructor include/linux/fs.h:2565 [inline] start_removing_path+0x8a/0x350 fs/namei.c:2964 handle_remove drivers/base/devtmpfs.c:325 [inline] handle drivers/base/devtmpfs.c:386 [inline] devtmpfs_work_loop+0x5c4/0xae4 drivers/base/devtmpfs.c:399 devtmpfsd+0x3f/0x50 drivers/base/devtmpfs.c:441 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Memory state around the buggy address: ffff8880551a9380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880551a9400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880551a9480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880551a9500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880551a9580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- 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.