From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oa1-f78.google.com (mail-oa1-f78.google.com [209.85.160.78]) (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 203CC369D56 for ; Tue, 19 May 2026 10:47:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.160.78 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779187654; cv=none; b=bXR5v1XNuoVC11h/1KkfD0u3lYm2iTUMGMQ+4ZNGDAAvLJzkpNk0UK2e/sPbxjl0mVYOwIDlVT54OmDUC+vvZ1BWxMpCaVviUwsjYWopMgs1jWAORfhdE2tnOihbbac/0dsCtTfL8+RQQio7KBIctNlGzF+uZUeG6rLXcSmJA1k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779187654; c=relaxed/simple; bh=NpDq0QVPIbABqsBEQzWj07PPeFtC4J3oOdcAnJRNEeQ=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=g2fOh+Rxbqy20XHSHFjzLWWVK/o6T9rEL36MGWK/u4BGfP1VpTQ8OvWCS6S99uosaplFvI9t7x/nYQEZSr5hl8DYyMeLSeQZRX2ibFbWYJHJIP9yGcMN0Ygr2RGSQajPozCScq6E6XCu0CZEA8OJt5zhfJRoylc1O238OUq7CMY= 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=209.85.160.78 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-oa1-f78.google.com with SMTP id 586e51a60fabf-43a55fd90faso3004823fac.1 for ; Tue, 19 May 2026 03:47:33 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1779187652; x=1779792452; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=pJ9UjoBWE13MpAMcHncfPXHgsKRwiHLAn4nv/eDd1dc=; b=hea5hSFInSl3WPjDejfJRRft3oEN0MgO4cV17/GEoMw26nBh1kWOOxLdVUB0r3JTOF +V+rcPKCVnyLXtyN8fyvnh9dO0HtZW7X4MWCKUxEG06uuOSHNUF02NZ31FLdwAfY6nfk 5tkBeqxxmWya9FF83ErdjDNqDxcL162RDGqtHroIbZUXL8HTYA9JY4qLpqf8MyM/FRSG IGmP8Ag+CEIEsGmkIwabkqoTM3AnOrUsTLHYXXw+Ub1sKDwfb39jdDLnRB0sFBNQdtcg +U+rIVacNj1NonRE6s3zhtEFXonE1yW9nbfvkG5tD86GO5usc6HGMQXjjCOWrHx6VNb8 Kh1g== X-Gm-Message-State: AOJu0YyIdggSOuGRFA9q0DPTZJJJ2LbV/e/KYWl6m+6GESibJV/3bpNd t3sYga0R8Mx4yegnHEy6x3hWlHer01KonQSSwavj45/V6CgqWpnPTt48fmc999ylJ4+CGcjlTpE PMmyhraxnllf1tH2m+yw3rig5mnRGKuwFO/3UlFbVKxGtAG33lu1I/K6cJXePbA== Precedence: bulk X-Mailing-List: linux-bluetooth@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a4a:ee08:0:b0:67e:1be4:d8d4 with SMTP id 006d021491bc7-69c9435b61cmr12019968eaf.21.1779187652227; Tue, 19 May 2026 03:47:32 -0700 (PDT) Date: Tue, 19 May 2026 03:47:32 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a0c3fc4.a00a0220.2ee31e.0002.GAE@google.com> Subject: [syzbot] [bluetooth?] KASAN: slab-use-after-free Read in skb_dequeue (2) From: syzbot To: linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org, luiz.dentz@gmail.com, marcel@holtmann.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: e98d21c170b0 Add linux-next specific files for 20260508 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=13d7df6c580000 kernel config: https://syzkaller.appspot.com/x/.config?x=59b98218d9b2edf4 dashboard link: https://syzkaller.appspot.com/bug?extid=d06554f43a8fb48030b0 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/66f2a00ee290/disk-e98d21c1.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/6b982257ce9e/vmlinux-e98d21c1.xz kernel image: https://storage.googleapis.com/syzbot-assets/a73fbea43e1a/bzImage-e98d21c1.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+d06554f43a8fb48030b0@syzkaller.appspotmail.com ================================================================== 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+0x40/0x60 kernel/locking/spinlock.c:166 Read of size 1 at addr ffff888029fc01a8 by task kworker/1:1/10569 CPU: 1 UID: 0 PID: 10569 Comm: kworker/1:1 Tainted: G L syzkaller #0 PREEMPT_{RT,(full)} Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 Workqueue: events btusb_rx_work 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 __kasan_check_byte+0x2a/0x40 mm/kasan/common.c:574 kasan_check_byte include/linux/kasan.h:402 [inline] lock_acquire+0x84/0x350 kernel/locking/lockdep.c:5844 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline] _raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:166 rtlock_slowlock kernel/locking/rtmutex.c:1918 [inline] rtlock_lock kernel/locking/spinlock_rt.c:43 [inline] __rt_spin_lock kernel/locking/spinlock_rt.c:49 [inline] rt_spin_lock+0x157/0x400 kernel/locking/spinlock_rt.c:57 spin_lock include/linux/spinlock_rt.h:45 [inline] skb_dequeue+0x2d/0x150 net/core/skbuff.c:3943 btusb_rx_work+0x27/0xd0 drivers/bluetooth/btusb.c:2477 process_one_work+0x98b/0x1630 kernel/workqueue.c:3306 process_scheduled_works kernel/workqueue.c:3389 [inline] worker_thread+0xb49/0x1140 kernel/workqueue.c:3470 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 8189: 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] __kmalloc_cache_noprof+0x3a6/0x690 mm/slub.c:5432 kmalloc_noprof include/linux/slab.h:950 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] btusb_probe+0x396/0x3050 drivers/bluetooth/btusb.c:4086 usb_probe_interface+0x659/0xc70 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x267/0xaf0 drivers/base/dd.c:707 __driver_probe_device+0x1e2/0x350 drivers/base/dd.c:869 driver_probe_device+0x4f/0x240 drivers/base/dd.c:899 __device_attach_driver+0x270/0x410 drivers/base/dd.c:1027 bus_for_each_drv+0x25b/0x2f0 drivers/base/bus.c:500 __device_attach+0x2c8/0x450 drivers/base/dd.c:1099 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1154 bus_probe_device+0x12d/0x220 drivers/base/bus.c:620 device_add+0x7ec/0xb90 drivers/base/core.c:3702 usb_set_configuration+0x1a87/0x2110 drivers/usb/core/message.c:2268 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:707 __driver_probe_device+0x1e2/0x350 drivers/base/dd.c:869 driver_probe_device+0x4f/0x240 drivers/base/dd.c:899 __device_attach_driver+0x270/0x410 drivers/base/dd.c:1027 bus_for_each_drv+0x25b/0x2f0 drivers/base/bus.c:500 __device_attach+0x2c8/0x450 drivers/base/dd.c:1099 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1154 bus_probe_device+0x12d/0x220 drivers/base/bus.c:620 device_add+0x7ec/0xb90 drivers/base/core.c:3702 usb_new_device+0x9f8/0x16e0 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+0x2a49/0x4f60 drivers/usb/core/hub.c:5953 process_one_work+0x98b/0x1630 kernel/workqueue.c:3306 process_scheduled_works kernel/workqueue.c:3389 [inline] worker_thread+0xb49/0x1140 kernel/workqueue.c:3470 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 Freed by task 8189: 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:2700 [inline] slab_free mm/slub.c:6291 [inline] kfree+0x1c5/0x6c0 mm/slub.c:6606 usb_unbind_interface+0x26e/0x910 drivers/usb/core/driver.c:458 device_remove drivers/base/dd.c:619 [inline] __device_release_driver drivers/base/dd.c:1350 [inline] device_release_driver_internal+0x4d9/0x870 drivers/base/dd.c:1373 bus_remove_device+0x45a/0x570 drivers/base/bus.c:664 device_del+0x52b/0x900 drivers/base/core.c:3891 usb_disable_device+0x3d4/0x8d0 drivers/usb/core/message.c:1478 usb_disconnect+0x315/0x970 drivers/usb/core/hub.c:2345 hub_port_connect drivers/usb/core/hub.c:5407 [inline] hub_port_connect_change drivers/usb/core/hub.c:5707 [inline] port_event drivers/usb/core/hub.c:5871 [inline] hub_event+0x1cf9/0x4f60 drivers/usb/core/hub.c:5953 process_one_work+0x98b/0x1630 kernel/workqueue.c:3306 process_scheduled_works kernel/workqueue.c:3389 [inline] worker_thread+0xb49/0x1140 kernel/workqueue.c:3470 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 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+0xcfd/0x1010 kernel/workqueue.c:2381 queue_delayed_work_on+0x11a/0x1e0 kernel/workqueue.c:2600 queue_delayed_work include/linux/workqueue.h:713 [inline] schedule_delayed_work include/linux/workqueue.h:855 [inline] btusb_recv_event drivers/bluetooth/btusb.c:1233 [inline] btusb_recv_intr+0x48a/0x750 drivers/bluetooth/btusb.c:1296 btusb_intr_complete+0x164/0x4c0 drivers/bluetooth/btusb.c:1481 __usb_hcd_giveback_urb+0x3b3/0x5e0 drivers/usb/core/hcd.c:1657 dummy_timer+0x8a9/0x47d0 drivers/usb/gadget/udc/dummy_hcd.c:2005 __run_hrtimer kernel/time/hrtimer.c:2032 [inline] __hrtimer_run_queues+0x405/0xb10 kernel/time/hrtimer.c:2096 hrtimer_run_softirq+0x18f/0x260 kernel/time/hrtimer.c:2113 handle_softirqs+0x1de/0x6d0 kernel/softirq.c:626 __do_softirq kernel/softirq.c:660 [inline] run_ktimerd+0x69/0x100 kernel/softirq.c:1155 smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160 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 ffff888029fc0000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 424 bytes inside of freed 4096-byte region [ffff888029fc0000, ffff888029fc1000) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x29fc0 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x80000000000040(head|node=0|zone=1) page_type: f5(slab) raw: 0080000000000040 ffff88813fea2140 dead000000000100 dead000000000122 raw: 0000000000000000 0000000800040004 00000000f5000000 0000000000000000 head: 0080000000000040 ffff88813fea2140 dead000000000100 dead000000000122 head: 0000000000000000 0000000800040004 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 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 12506, tgid 12506 (udevd), ts 1311497819285, free_ts 1308795551293 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1861 prep_new_page mm/page_alloc.c:1869 [inline] get_page_from_freelist+0x27d6/0x2850 mm/page_alloc.c:3949 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5292 alloc_slab_page mm/slub.c:3289 [inline] allocate_slab+0x74/0x5e0 mm/slub.c:3404 new_slab mm/slub.c:3447 [inline] refill_objects+0x33c/0x3d0 mm/slub.c:7319 refill_sheaf mm/slub.c:2827 [inline] __pcs_replace_empty_main+0x373/0x720 mm/slub.c:4664 alloc_from_pcs mm/slub.c:4762 [inline] slab_alloc_node mm/slub.c:4896 [inline] __do_kmalloc_node mm/slub.c:5307 [inline] __kmalloc_noprof+0x530/0x7b0 mm/slub.c:5320 kmalloc_noprof include/linux/slab.h:954 [inline] tomoyo_realpath_from_path+0xe3/0x5d0 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path2_perm+0x2e7/0x760 security/tomoyo/file.c:928 tomoyo_path_rename+0x14e/0x1b0 security/tomoyo/tomoyo.c:300 security_path_rename+0x248/0x460 security/security.c:1544 filename_renameat2+0x4c1/0x9c0 fs/namei.c:6167 __do_sys_rename fs/namei.c:6216 [inline] __se_sys_rename+0x55/0x2c0 fs/namei.c:6212 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 14890 tgid 14890 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1405 [inline] free_pages_prepare+0x900/0xa60 mm/page_alloc.c:1450 __free_contig_range_common+0x174/0x340 mm/page_alloc.c:6883 __free_contig_range mm/page_alloc.c:6928 [inline] free_pages_bulk+0x48/0x120 mm/page_alloc.c:5245 vfree+0x292/0x390 mm/vmalloc.c:3467 vb2_vmalloc_put+0x68/0xb0 drivers/media/common/videobuf2/videobuf2-vmalloc.c:68 __vb2_buf_mem_free+0x119/0x2d0 drivers/media/common/videobuf2/videobuf2-core.c:275 __vb2_free_mem drivers/media/common/videobuf2/videobuf2-core.c:571 [inline] __vb2_queue_free+0x414/0xb00 drivers/media/common/videobuf2/videobuf2-core.c:599 vb2_core_reqbufs+0x7a0/0x1410 drivers/media/common/videobuf2/videobuf2-core.c:905 __vb2_cleanup_fileio+0x109/0x1f0 drivers/media/common/videobuf2/videobuf2-core.c:2977 vb2_core_queue_release+0x27/0x150 drivers/media/common/videobuf2/videobuf2-core.c:2676 vb2_queue_release drivers/media/common/videobuf2/videobuf2-v4l2.c:956 [inline] _vb2_fop_release drivers/media/common/videobuf2/videobuf2-v4l2.c:1159 [inline] vb2_fop_release+0x171/0x200 drivers/media/common/videobuf2/videobuf2-v4l2.c:1173 v4l2_release+0x1b2/0x370 drivers/media/v4l2-core/v4l2-dev.c:468 __fput+0x461/0xa70 fs/file_table.c:510 task_work_run+0x1d9/0x270 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:67 [inline] exit_to_user_mode_loop+0xf3/0x4d0 kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline] do_syscall_64+0x33e/0xf80 arch/x86/entry/syscall_64.c:100 Memory state around the buggy address: ffff888029fc0080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888029fc0100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888029fc0180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888029fc0200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888029fc0280: 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