From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi2-f1.google.com (mail-oi2-f1.google.com [74.125.231.193]) (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 66EF133F399 for ; Sun, 23 Aug 2026 01:43:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.231.193 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787449418; cv=none; b=KkOxFgr4dY+aMgOQKAPW+XTZJq2gVlQEEPLSwcCd1yKoyb0LSn6aeftywh4BPJzqCRawdAVh6UQ1mab8hUr9e41QcX3ZzYeP/RgNjUXBbyH5XbrUMSVcJSDpIKhz7JEPRMG+0/vl6sdHoxjarhUD5I/BdOmK6/AvKexHJtKTlQQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787449418; c=relaxed/simple; bh=KqlhfNW532a9LP3pkCSsNMN+0ODrQrMcolhgBRExKog=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=Pzrq18zNAEA2vY/dZ8lBVE6z6tp6E6cASyJzv2YNChBMUkb+YKLPRdy1a1Iw0PrQVItpiwJX9+kJDG9UytD/d0VeWEJTIPjNq/QFxWSaqqpZuVKVJ1+UfVVPVkSjpOt6yo4Yq0CFzc6sTGZ2XI/wbXKBHJUCTNwjSmpYbG6MSfw= 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=74.125.231.193 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-oi2-f1.google.com with SMTP id 5614622812f47-4960cd51443so169691b6e.1 for ; Sat, 22 Aug 2026 18:43:36 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1787449415; x=1788054215; h=content-type:to:from:subject:message-id:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=v86Mt6Pyeq9swYFtArO8cP1+HO5Yyqv65TdzCRH5ZHQ=; b=Up0el8w7HqhIvHyyLlwtOThoBGUgL1LVd2XG+a9kxasc+Wu0exHSEwjXGg6zJDW2gx CVMpHWK47zyL+wBns9CSOxqCmijbATJWEj9zfnbA2WH75NrVEgcBWYSFAH6gYeKt//jG Yd1nyXrQtvrU7DkxdcPzf527TZZnt+yqxzwUQkiyIL8eefDQpgYlKO3yxwaeWVkJB17F 1IYO8jPP2Br0jR5o1Fm6izEvNAzt6wQdXlO5T3gKFquaT6nbCwI2z92FVlRoE4if5EH9 kggXa3og1HdXymvla+r9X6tHYKvthbaxB96Vp8rN3hZkvzG2efCXEEMOoX1KyOLDigMt Y4MA== X-Forwarded-Encrypted: i=1; AHgh+Rpaw6HFJC+Zg+bxiDKjnVnOQM5aVm7CgYFs31SI+XkQhflkX4JWQLSOq8MpYOrf39Hv2/xSODqikQLq0WU=@vger.kernel.org X-Gm-Message-State: AFuF++n2mQI+mqZcPGgWwsRxWAewpGCdOGvqQLAf9OdPu++4A4dJHE/j cF3yLkIPF8wuXgGCjI80L+eLTF54E86mboxlnm+0hD12t0XCuAq1cBAJF0MbwYC8zmUPHFZLGd6 NidUOu0MQ+eex7JQHG2wu9EaBpSRTX5PXOntDflCIg1gyAXHjIXBkAnJxMzc= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:1c06:b0:4a4:ddde:5207 with SMTP id 5614622812f47-4b3099f7b0cmr10532617b6e.8.1787449415352; Sat, 22 Aug 2026 18:43:35 -0700 (PDT) Date: Sat, 22 Aug 2026 18:43:35 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a8a5047.dbb3a75c.13dd47.003e.GAE@google.com> Subject: [syzbot] [usb?] KASAN: slab-use-after-free Write in usb_giveback_urb_bh From: syzbot To: gregkh@linuxfoundation.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: a4ff2be345d0 Merge tag 'v7.3-p1' of git://git.kernel.org/p.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1723ee79580000 kernel config: https://syzkaller.appspot.com/x/.config?x=2823969bbc36a8c4 dashboard link: https://syzkaller.appspot.com/bug?extid=cade843a1e4af0651f5e compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/058e33081021/disk-a4ff2be3.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/33ebad2a63ba/vmlinux-a4ff2be3.xz kernel image: https://storage.googleapis.com/syzbot-assets/6e7b43fa415b/bzImage-a4ff2be3.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+cade843a1e4af0651f5e@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-use-after-free in usb_giveback_urb_bh+0x2b9/0x440 drivers/usb/core/hcd.c:1692 Write of size 8 at addr ffff888029ab0338 by task ksoftirqd/0/15 CPU: 0 UID: 0 PID: 15 Comm: ksoftirqd/0 Tainted: G L syzkaller #0 PREEMPT_{RT,(full)} Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 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 usb_giveback_urb_bh+0x2b9/0x440 drivers/usb/core/hcd.c:1692 process_one_work kernel/workqueue.c:3322 [inline] process_scheduled_works+0xa88/0x14c0 kernel/workqueue.c:3405 bh_worker+0x46a/0x880 kernel/workqueue.c:3708 tasklet_hi_action+0xf/0x70 kernel/softirq.c:1003 handle_softirqs+0x1da/0x6d0 kernel/softirq.c:645 run_ksoftirqd+0x53/0x190 kernel/softirq.c:1108 smpboot_thread_fn+0x565/0xa70 kernel/smpboot.c:160 kthread+0x38b/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+0x422/0x780 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 dummy_hcd_probe+0xf6/0x270 drivers/usb/gadget/udc/dummy_hcd.c:2717 platform_probe+0xf9/0x190 drivers/base/platform.c:1507 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+0x25b/0x2f0 drivers/base/bus.c:500 __device_attach+0x2c7/0x450 drivers/base/dd.c:1098 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1153 bus_probe_device+0x12d/0x220 drivers/base/bus.c:620 device_add+0x7d7/0xb80 drivers/base/core.c:3776 platform_device_add+0x4bd/0x860 drivers/base/platform.c:833 dummy_hcd_init+0x667/0xd00 drivers/usb/gadget/udc/dummy_hcd.c:2873 do_one_initcall+0x250/0x870 init/main.c:1353 do_initcall_level+0x10a/0x1a0 init/main.c:1415 do_initcalls+0x59/0xa0 init/main.c:1431 kernel_init_freeable+0x29d/0x3e0 init/main.c:1666 kernel_init+0x22/0x1d0 init/main.c:1556 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 8989: 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+0x1c5/0x6d0 mm/slub.c:6692 usb_release_dev+0x57/0xe0 drivers/usb/core/usb.c:497 device_release+0xc4/0x1f0 drivers/base/core.c:-1 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x222/0x550 lib/kobject.c:737 usbdev_open+0x1f0/0x790 drivers/usb/core/devio.c:1086 chrdev_open+0x4dc/0x600 fs/char_dev.c:411 do_dentry_open+0x849/0x1420 fs/open.c:996 vfs_open+0x3b/0x350 fs/open.c:1101 do_open fs/namei.c:4837 [inline] path_openat+0x1448/0x1d60 fs/namei.c:5000 do_file_open+0x23e/0x4a0 fs/namei.c:5029 do_sys_openat2+0x115/0x200 fs/open.c:1417 do_sys_open fs/open.c:1423 [inline] __do_sys_openat fs/open.c:1439 [inline] __se_sys_openat fs/open.c:1434 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1434 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 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+0xd1e/0x10f0 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+0x33d/0x3e0 drivers/usb/core/hcd.c:1580 usb_hcd_flush_endpoint+0x167/0x440 drivers/usb/core/hcd.c:1794 usb_disable_endpoint drivers/usb/core/message.c:1362 [inline] usb_disable_interface+0x279/0x350 drivers/usb/core/message.c:1408 usb_unbind_interface+0x265/0x9f0 drivers/usb/core/driver.c:456 device_remove drivers/base/dd.c:618 [inline] __device_release_driver drivers/base/dd.c:1349 [inline] device_release_driver_internal+0x4f5/0x880 drivers/base/dd.c:1372 bus_remove_device+0x449/0x560 drivers/base/bus.c:664 device_del+0x528/0x8f0 drivers/base/core.c:3965 usb_disable_device+0x3d4/0x8d0 drivers/usb/core/message.c:1478 usb_disconnect+0x32d/0x990 drivers/usb/core/hub.c:2345 usb_remove_hcd+0x275/0x670 drivers/usb/core/hcd.c:3059 dummy_hcd_remove+0xed/0x130 drivers/usb/gadget/udc/dummy_hcd.c:2761 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+0x1a4/0x1d0 drivers/base/bus.c:244 kernfs_fop_write_iter+0x3a5/0x540 fs/kernfs/file.c:345 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x61e/0xbb0 fs/read_write.c:687 ksys_write+0x156/0x270 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f 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+0xd1e/0x10f0 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+0xa2d/0x1b40 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 usb_clear_port_feature drivers/usb/core/hub.c:456 [inline] port_event drivers/usb/core/hub.c:5773 [inline] hub_event+0x832/0x4cf0 drivers/usb/core/hub.c:5961 process_one_work kernel/workqueue.c:3322 [inline] process_scheduled_works+0xa88/0x14c0 kernel/workqueue.c:3405 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486 kthread+0x38b/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 ffff888029ab0000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 824 bytes inside of freed 2048-byte region [ffff888029ab0000, ffff888029ab0800) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888029ab6000 pfn:0x29ab0 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x80000000000240(workingset|head|node=0|zone=1) page_type: f5(slab) raw: 0080000000000240 ffff88813ffb2000 ffffea0000a7ce10 ffffea0000a55a10 raw: ffff888029ab6000 0000000800080006 00000000f5000000 0000000000000000 head: 0080000000000240 ffff88813ffb2000 ffffea0000a7ce10 ffffea0000a55a10 head: ffff888029ab6000 0000000800080006 00000000f5000000 0000000000000000 head: 0080000000000003 fffffffffffffe01 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 12235747769, free_ts 11878976125 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+0x2630/0x26a0 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+0x2d8/0x350 mm/slub.c:7310 refill_sheaf mm/slub.c:2804 [inline] __pcs_replace_empty_main+0x334/0x690 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+0x54c/0x780 mm/slub.c:5359 _kmalloc_noprof include/linux/slab.h:992 [inline] _kzalloc_noprof include/linux/slab.h:1309 [inline] platform_device_alloc+0x39/0x260 drivers/base/platform.c:634 dummy_hcd_init+0x2c9/0xd00 drivers/usb/gadget/udc/dummy_hcd.c:2841 do_one_initcall+0x250/0x870 init/main.c:1353 do_initcall_level+0x10a/0x1a0 init/main.c:1415 do_initcalls+0x59/0xa0 init/main.c:1431 kernel_init_freeable+0x29d/0x3e0 init/main.c:1666 kernel_init+0x22/0x1d0 init/main.c:1556 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 page last free pid 100 tgid 100 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1406 [inline] free_pages_prepare+0x946/0xa40 mm/page_alloc.c:1451 __free_contig_range_common+0x174/0x340 mm/page_alloc.c:6897 __free_contig_range mm/page_alloc.c:6942 [inline] free_pages_bulk+0x48/0x120 mm/page_alloc.c:5257 vm_area_free_pages mm/vmalloc.c:3461 [inline] vfree+0x26d/0x510 mm/vmalloc.c:3510 delayed_vfree_work+0x55/0x80 mm/vmalloc.c:3414 process_one_work kernel/workqueue.c:3322 [inline] process_scheduled_works+0xa88/0x14c0 kernel/workqueue.c:3405 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486 kthread+0x38b/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 Memory state around the buggy address: ffff888029ab0200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888029ab0280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888029ab0300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888029ab0380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888029ab0400: 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