From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f80.google.com (mail-oo1-f80.google.com [209.85.161.80]) (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 CB8B647AF5D for ; Thu, 6 Aug 2026 15:27:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.80 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786030061; cv=none; b=gLewJzoBuW4WT4wY5jppq+f2cGt5WZjCq5rn3G8xDLELQrnuHTZ8NWA0RARv3McS6PSr+hCP9nbnU3bAib99FkAHpHST+IYhUeznl8v/pcUmFpAAM3OSJerxlBTcCgMaDkKwD5/LFMuCL9ama55EwkyBCidEKm/lR5cv0Uh+L+0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786030061; c=relaxed/simple; bh=TLNtzi0beNnNqupIwhyuBN9Vv8zU9F7Fn7xciLxGe9c=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=EbzB71pmjd9MKVp9/hFTFd9darQhL/vNQex4y5GiZm5EGwqRhlP7sD0IyWAgc+npktOYrlPM2LGHDSIw4cAFxfyyBP243giYSbTd1dx4PMMjPXc8VQcGV7Ax9kjlDuqIGoP0i3gZNckmkaPeClT2kHbof9dPQaulkFG4Z/7XhRQ= 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=209.85.161.80 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-oo1-f80.google.com with SMTP id 006d021491bc7-6ae8bc06f00so1862535eaf.3 for ; Thu, 06 Aug 2026 08:27:38 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1786030058; x=1786634858; 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=ol6ErYFCCNoJaQku5fxC4rrTezrEzpC4/VWFbSEPWx8=; b=S/x/UWtPF1GH09UJ5VI/ACGu72JzrKdBDFom+LJPGPczcg1lhlgHNzsg2giON3q50w hEtZeewps6kbMEDOQZyYji+OEl4b5hnSZPBz/1lS8m+uEW+Ik0/3/mhmvqXcIE2GAPgS A+lvI+TV1mWDhW2bVUH3arYgAI41O1TDxkWI8POENn4HJ6BJ8nXh4cb9TSP5bM5eoHt0 97FQlEdSfz/dpcqzU8VZcQvcgrvHFc1QC0Kd+q7YHDfmwTZuyN+nwNMZu9Uo9hiqPrty zwquxHlj9XYmKRtIQxowbDVxznAH+IThDY5YHZO2uOtaV5FStG0oBZk6VyATWOrUwXUt IK8Q== X-Forwarded-Encrypted: i=1; AHgh+RpHEsQHut5rk4fnlS4c9abCL/O8KLycSE0i7EhChTq22yOSAt1nJX4b2irok1NgQRoMj6IR8eqsz3LRTX0=@vger.kernel.org X-Gm-Message-State: AOJu0YxO/WMTRkOfXOW9W8YLabpx7nuc+PTSXMxVd32+e0pDkMJcP9sF k1MZsjKvgSlGn/rSKv/BmSxy6jxP75os4JyQWgHOGDKF49RyKSAtWjWWHd8zdLb1vCVXAbrN2Q8 cHnXvjIePPL/HZsv6pCS7cNuUVl/wwKigigtZvEwWjEbU37rvxO//WlrD/60= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:178f:b0:6ae:c68b:3a7 with SMTP id 006d021491bc7-6b0213d0da9mr1305121eaf.16.1786030057871; Thu, 06 Aug 2026 08:27:37 -0700 (PDT) Date: Thu, 06 Aug 2026 08:27:37 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a74a7e9.01d0871a.3a0d52.0023.GAE@google.com> Subject: [syzbot] [usb?] KASAN: slab-use-after-free Read in trace_event_raw_event_udc_log_req 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: 848acc8ffe1b Merge tag 'fsverity-for-linus' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=122adc9e580000 kernel config: https://syzkaller.appspot.com/x/.config?x=f221a1b5d497ed15 dashboard link: https://syzkaller.appspot.com/bug?extid=de553c19cb054f174a35 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-848acc8f.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/31f94fe4d67f/vmlinux-848acc8f.xz kernel image: https://storage.googleapis.com/syzbot-assets/391ba15cbf42/bzImage-848acc8f.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+de553c19cb054f174a35@syzkaller.appspotmail.com configfs-gadget.g1 gadget.0: uvc: uvc_function_bind() configfs-gadget.g1 gadget.0: uvc: Unable to allocate streaming EP ================================================================== BUG: KASAN: slab-use-after-free in do_trace_event_raw_event_udc_log_req drivers/usb/gadget/udc/trace.h:223 [inline] BUG: KASAN: slab-use-after-free in trace_event_raw_event_udc_log_req+0x665/0x6c0 drivers/usb/gadget/udc/trace.h:223 Read of size 4 at addr ffff88802614ee10 by task syz.4.3628/14808 CPU: 3 UID: 0 PID: 14808 Comm: syz.4.3628 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 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 do_trace_event_raw_event_udc_log_req drivers/usb/gadget/udc/trace.h:223 [inline] trace_event_raw_event_udc_log_req+0x665/0x6c0 drivers/usb/gadget/udc/trace.h:223 __do_trace_usb_ep_free_request drivers/usb/gadget/udc/trace.h:269 [inline] trace_usb_ep_free_request drivers/usb/gadget/udc/trace.h:269 [inline] usb_ep_free_request+0x1cc/0x280 drivers/usb/gadget/udc/core.c:220 uvc_function_bind+0x181a/0x1939 drivers/usb/gadget/function/f_uvc.c:893 usb_add_function+0x219/0x890 drivers/usb/gadget/composite.c:333 configfs_composite_bind+0xd83/0x1960 drivers/usb/gadget/configfs.c:1802 gadget_bind_driver+0x28c/0xbf0 drivers/usb/gadget/udc/core.c:1662 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 __driver_attach+0x21f/0x5b0 drivers/base/dd.c:1292 bus_for_each_dev+0x13e/0x1d0 drivers/base/bus.c:383 bus_add_driver+0x305/0x5b0 drivers/base/bus.c:763 driver_register+0x1e2/0x360 drivers/base/driver.c:174 usb_gadget_register_driver_owner+0x132/0x210 drivers/usb/gadget/udc/core.c:1752 gadget_dev_desc_UDC_store+0x1b0/0x2e0 drivers/usb/gadget/configfs.c:300 flush_write_buffer fs/configfs/file.c:207 [inline] configfs_write_iter+0x302/0x4e0 fs/configfs/file.c:229 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_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0xe7/0x970 arch/x86/entry/syscall_32.c:307 do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:332 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf709efec Code: Unable to access opcode bytes at 0xf709efc2. RSP: 002b:00000000f548d50c EFLAGS: 00000292 ORIG_RAX: 0000000000000004 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000800001c0 RDX: 000000000000000b RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 14351: 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] __devl_resource_register+0x178/0x630 net/devlink/resource.c:500 devl_port_resource_register+0x5f/0x90 net/devlink/resource.c:712 __nsim_dev_port_add+0x35f/0x8f0 drivers/net/netdevsim/dev.c:1497 nsim_dev_port_add_all drivers/net/netdevsim/dev.c:1570 [inline] nsim_drv_probe+0xdbd/0x13a0 drivers/net/netdevsim/dev.c:1731 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 nsim_bus_dev_new drivers/net/netdevsim/bus.c:471 [inline] new_device_store+0x40b/0x700 drivers/net/netdevsim/bus.c:191 bus_attr_store+0x74/0xb0 drivers/base/bus.c:172 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_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] do_int80_emulation+0x14b/0x720 arch/x86/entry/syscall_32.c:172 asm_int80_emulation+0x1a/0x20 arch/x86/include/asm/idtentry.h:598 Freed by task 14628: 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 __devl_resources_unregister+0x179/0x2e0 net/devlink/resource.c:585 __nsim_dev_port_del+0x225/0x2b0 drivers/net/netdevsim/dev.c:1550 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1561 [inline] nsim_dev_reload_destroy+0x10a/0x4a0 drivers/net/netdevsim/dev.c:1785 nsim_dev_reload_down+0x66/0xd0 drivers/net/netdevsim/dev.c:1038 devlink_reload+0x1ae/0x7a0 net/devlink/dev.c:462 devlink_pernet_pre_exit+0x247/0x370 net/devlink/core.c:560 ops_pre_exit_list net/core/net_namespace.c:161 [inline] ops_undo_list+0x187/0xab0 net/core/net_namespace.c:234 cleanup_net+0x499/0x920 net/core/net_namespace.c:702 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 ffff88802614ee00 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 16 bytes inside of freed 128-byte region [ffff88802614ee00, ffff88802614ee80) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88802614e400 pfn:0x2614e flags: 0xfff00000000200(workingset|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000200 ffff88801bc42a00 ffffea00008a09d0 ffffea000039f290 raw: ffff88802614e400 000000080010000d 00000000f5000000 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5171, tgid 5171 (udevd), ts 24372012460, free_ts 22742895399 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] __kmalloc_cache_noprof+0x479/0x6c0 mm/slub.c:5485 _kmalloc_noprof include/linux/slab.h:988 [inline] _kzalloc_noprof include/linux/slab.h:1309 [inline] kernfs_get_open_node fs/kernfs/file.c:536 [inline] kernfs_fop_open+0x9fa/0xd50 fs/kernfs/file.c:711 do_dentry_open+0x6ab/0x14d0 fs/open.c:947 vfs_open+0x82/0x3f0 fs/open.c:1052 do_open fs/namei.c:4700 [inline] path_openat+0x2873/0x4280 fs/namei.c:4863 do_file_open+0x20e/0x430 fs/namei.c:4892 do_sys_openat2+0x10f/0x1e0 fs/open.c:1368 do_sys_open fs/open.c:1374 [inline] __do_sys_openat fs/open.c:1390 [inline] __se_sys_openat fs/open.c:1385 [inline] __x64_sys_openat+0x12d/0x210 fs/open.c:1385 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x840 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 5304 tgid 5304 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+0x35/0x390 fs/namei.c:187 class_filename_flags_constructor include/linux/fs.h:2566 [inline] do_sys_openat2+0xc7/0x1e0 fs/open.c:1367 do_sys_open fs/open.c:1374 [inline] __do_sys_openat fs/open.c:1390 [inline] __se_sys_openat fs/open.c:1385 [inline] __x64_sys_openat+0x12d/0x210 fs/open.c:1385 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x840 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88802614ed00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc ffff88802614ed80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88802614ee00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802614ee80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802614ef00: fa 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