From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f80.google.com (mail-ot1-f80.google.com [209.85.210.80]) (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 05ED536A033 for ; Tue, 4 Aug 2026 00:40:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.80 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785804028; cv=none; b=uM5UYh2bAcFk0P3KFuVplQyCsdKmtQwZo+kSchmyvMPFwbz5slunjTzMdD8OhHNTzMtBAaiXuZT9+MPlnQ9sZZNXj4o8yBCPgfOw29JHcKzfnDhlQq2o4VhzB0dnlN71zXm6q7DhiHH28OppKGCxgxBz75SkpTfllwGLKPmnOpA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785804028; c=relaxed/simple; bh=I6gWXDEwBVOZPIWwvrZHaxO/3M9QKCkpQ22/xhJC5V8=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=LpG4aA/x+Go9C5o0qWTqLur0ucT+/9o1wnhaV7FrkS8NFjtR4e5cUdPEjaQNmDkL21LPMiacoUJuEaIk84JLmvJG6yzH+ziCr0ZsJi3FUoArh5AQKYwClQwNQ1v+E1rl+yhsrgwVCLz7uW2QkEDAVw3zVEFPVN8HCusuZiKenUc= 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=209.85.210.80 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-f80.google.com with SMTP id 46e09a7af769-7e9e0e71e05so6175555a34.2 for ; Mon, 03 Aug 2026 17:40:26 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1785804026; x=1786408826; 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=5ubF6i7JD4IUrpmUaXuu4x/832Ry3dsg6m3Oj3ejdvQ=; b=Z6Zzyks2B1fswTyhcn4fI3OXrhgmpK0Xdkssb0E+3/rIf6hVQF+wEs98GcDmGLRWGl 63WwhzC4a5OnZlJ0zWGiJ/md6uBGvOndHUBuwM1idl5IO6LUASTBYGDVzeoERzAH5d+k TZCSNeFHeNHImEcAboBSneAVyJcRhT67W2g26JMoSMtCdUFLcx36AWnc6W0wb+Kz6CKe tXNQR6fWLU26YyiGxGEfcU/SyjA23bH6z83KmVxqOBsGoS801kMeBMP05tDqIIWTGK57 /5/te5+5lz3o9kIQ5vPRI6QWfzE20cOlXop7BoOIVY3xVdZkEr1vkab8i9trcZEVrEW4 ggvg== X-Forwarded-Encrypted: i=1; AHgh+RqVu0X2AULldA2aLu2SuGOPwRyJ6B+PlrQjNvhxCeoQXoojqdDwH6/q2mW3dOuiS07+Gitd3VYWzpYIf78=@vger.kernel.org X-Gm-Message-State: AOJu0YyqGeIHXbCUfRtlEQDrJKeJ+U9uKYqBCMX4dfZr4CE7CIvx93hF syuMtlQpt+2dvQgtrTYlb58cx+dIbAiGRt/MbmZZGYjAevftuJu0grHeqjw5XZ953zTp37C/XxU L7W79lDVb7pOWI7j+0Dzj6YxOuUP5POq/1fXBGKP5FHnFqGbt/WgR2jbfauU= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:5241:b0:4a4:866:c395 with SMTP id 5614622812f47-4af5e335346mr19213504b6e.13.1785804025786; Mon, 03 Aug 2026 17:40:25 -0700 (PDT) Date: Mon, 03 Aug 2026 17:40:25 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a7134f9.13623e66.bdc14.0005.GAE@google.com> Subject: [syzbot] [usb?] KASAN: slab-use-after-free Read in lookup_object_or_alloc (4) From: syzbot To: 3chas3@gmail.com, accessrunner-general@lists.sourceforge.net, gregkh@linuxfoundation.org, linux-atm-general@lists.sourceforge.net, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 11028ab62899 Merge tag 'probes-fixes-v7.2-rc5' of git://gi.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=159225b9580000 kernel config: https://syzkaller.appspot.com/x/.config?x=145fa60d73086782 dashboard link: https://syzkaller.appspot.com/bug?extid=e4b1171e7c5ae2556f9e compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/dbf4cb7b4116/disk-11028ab6.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/77761f1559a8/vmlinux-11028ab6.xz kernel image: https://storage.googleapis.com/syzbot-assets/bb1ed2bbff0e/bzImage-11028ab6.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+e4b1171e7c5ae2556f9e@syzkaller.appspotmail.com ATM dev 0: poll status: error -5 ATM dev 0: polling disabled, set adsl_state to 'start' or 'poll' to resume ================================================================== BUG: KASAN: slab-use-after-free in timer_is_static_object+0x80/0x90 kernel/time/timer.c:691 Read of size 8 at addr ffff88805443f8f8 by task kworker/0:7/5803 CPU: 0 UID: 0 PID: 5803 Comm: kworker/0:7 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 Workqueue: events cxacru_poll_status 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 timer_is_static_object+0x80/0x90 kernel/time/timer.c:691 lookup_object_or_alloc.part.0+0x386/0x4f0 lib/debugobjects.c:696 lookup_object_or_alloc lib/debugobjects.c:682 [inline] debug_object_activate+0x2fd/0x4b0 lib/debugobjects.c:875 debug_timer_activate kernel/time/timer.c:793 [inline] __mod_timer+0x845/0xca0 kernel/time/timer.c:1124 add_timer_global+0x8e/0xd0 kernel/time/timer.c:1283 __queue_delayed_work+0x331/0x450 kernel/workqueue.c:2585 queue_delayed_work_on+0x180/0x1e0 kernel/workqueue.c:2620 queue_delayed_work include/linux/workqueue.h:714 [inline] schedule_delayed_work include/linux/workqueue.h:856 [inline] cxacru_poll_status+0x622/0xdc0 drivers/usb/atm/cxacru.c:931 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 5803: 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] __kmalloc_cache_noprof+0x2e5/0x6c0 mm/slub.c:5489 _kmalloc_noprof include/linux/slab.h:988 [inline] _kzalloc_noprof include/linux/slab.h:1309 [inline] cxacru_bind+0xac/0x1440 drivers/usb/atm/cxacru.c:1133 usbatm_usb_probe+0x378/0x1b50 drivers/usb/atm/usbatm.c:1058 cxacru_usb_probe+0x101/0x200 drivers/usb/atm/cxacru.c:1370 usb_probe_interface+0x303/0x8f0 drivers/usb/core/driver.c:396 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 driver_probe_device+0x4a/0x140 drivers/base/dd.c:898 __device_attach_driver+0x1df/0x320 drivers/base/dd.c:1026 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500 __device_attach+0x1e4/0x4d0 drivers/base/dd.c:1098 device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1153 bus_probe_device+0x64/0x160 drivers/base/bus.c:620 device_add+0x121d/0x1970 drivers/base/core.c:3772 usb_set_configuration+0xd97/0x1c60 drivers/usb/core/message.c:2268 usb_generic_driver_probe+0xa1/0xe0 drivers/usb/core/generic.c:250 usb_probe_device+0xef/0x400 drivers/usb/core/driver.c:291 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 driver_probe_device+0x4a/0x140 drivers/base/dd.c:898 __device_attach_driver+0x1df/0x320 drivers/base/dd.c:1026 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500 __device_attach+0x1e4/0x4d0 drivers/base/dd.c:1098 device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1153 bus_probe_device+0x64/0x160 drivers/base/bus.c:620 device_add+0x121d/0x1970 drivers/base/core.c:3772 usb_new_device.cold+0x685/0x115c 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+0x30a3/0x4a60 drivers/usb/core/hub.c:5953 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 Freed by task 5718: 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 cxacru_unbind+0x1fc/0x3d0 drivers/usb/atm/cxacru.c:1266 usbatm_usb_disconnect+0x449/0x7e0 drivers/usb/atm/usbatm.c:1255 usb_unbind_interface+0x1dd/0x9e0 drivers/usb/core/driver.c:458 device_remove drivers/base/dd.c:618 [inline] device_remove+0x12a/0x180 drivers/base/dd.c:610 __device_release_driver drivers/base/dd.c:1349 [inline] device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372 bus_remove_device+0x2bc/0x560 drivers/base/bus.c:664 device_del+0x376/0x9b0 drivers/base/core.c:3961 usb_disable_device+0x367/0x810 drivers/usb/core/message.c:1478 usb_disconnect+0x2e2/0x9a0 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+0x1c4f/0x4a60 drivers/usb/core/hub.c:5953 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 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 call_timer_fn+0x19a/0x610 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1794 [inline] __run_timers+0x570/0xb00 kernel/time/timer.c:2374 __run_timer_base kernel/time/timer.c:2386 [inline] __run_timer_base kernel/time/timer.c:2378 [inline] run_timer_base+0x114/0x190 kernel/time/timer.c:2395 run_timer_softirq+0x1a/0x50 kernel/time/timer.c:2405 handle_softirqs+0x1ea/0x9b0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x162/0x210 kernel/softirq.c:735 irq_exit_rcu+0x9/0x30 kernel/softirq.c:752 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0xa3/0xc0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 The buggy address belongs to the object at ffff88805443f800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 248 bytes inside of freed 1024-byte region [ffff88805443f800, ffff88805443fc00) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x54438 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 ffff88813fe23dc0 dead000000000100 dead000000000122 raw: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88813fe23dc0 dead000000000100 dead000000000122 head: 0000000000000000 0000000800100010 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 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1019, tgid 1019 (kworker/u8:7), ts 92204884189, free_ts 91158504294 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] ieee802_11_parse_elems_full+0x17c/0x3bc0 net/mac80211/parse.c:1073 ieee802_11_parse_elems net/mac80211/ieee80211_i.h:2551 [inline] ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1540 [inline] ieee80211_ibss_rx_queued_mgmt+0xc96/0x1c70 net/mac80211/ibss.c:1571 ieee80211_iface_process_skb net/mac80211/iface.c:1769 [inline] ieee80211_iface_work+0xa9a/0x1070 net/mac80211/iface.c:1823 cfg80211_wiphy_work+0x2b7/0x550 net/wireless/core.c:538 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 page last free pid 5873 tgid 5870 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 __folio_put+0x3b4/0x5f0 mm/swap.c:112 folio_put include/linux/mm.h:2124 [inline] put_page include/linux/mm.h:2193 [inline] put_netmem include/net/netmem.h:394 [inline] skb_page_unref include/linux/skbuff_ref.h:43 [inline] __skb_frag_unref include/linux/skbuff_ref.h:56 [inline] skb_release_data+0x649/0x8e0 net/core/skbuff.c:1110 skb_release_all net/core/skbuff.c:1191 [inline] __kfree_skb net/core/skbuff.c:1205 [inline] kfree_skb_napi_cache net/core/skbuff.c:7281 [inline] skb_attempt_defer_free+0x38d/0x830 net/core/skbuff.c:7319 tcp_eat_recv_skb net/ipv4/tcp.c:1621 [inline] tcp_recvmsg_locked+0x11ed/0x2a30 net/ipv4/tcp.c:2899 tcp_recvmsg+0x141/0x630 net/ipv4/tcp.c:2944 inet_recvmsg+0xd5/0x4c0 net/ipv4/af_inet.c:894 sock_recvmsg_nosec net/socket.c:1126 [inline] sock_recvmsg+0x1b8/0x220 net/socket.c:1148 __sys_recvfrom+0x1f2/0x2f0 net/socket.c:2302 __do_sys_recvfrom net/socket.c:2317 [inline] __se_sys_recvfrom net/socket.c:2313 [inline] __x64_sys_recvfrom+0xe0/0x1c0 net/socket.c:2313 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 Memory state around the buggy address: ffff88805443f780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88805443f800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88805443f880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805443f900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805443f980: 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