From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f79.google.com (mail-oo1-f79.google.com [209.85.161.79]) (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 EB33F285058 for ; Mon, 17 Aug 2026 02:58:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.79 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786935515; cv=none; b=Tame89hzsQXMZLt5dgaiIawOMFV6QxxdK0Vew6SUqopNg67VI9WspIqUnaBsULqt8JAKgOBU0XIVhjtyMK+y7bzDJID1xRuao8kQef/ZdTcVnNiz99yUVXi1dx/1lGxdyN6SA/f4DhvRn6bWpgHJ8t61DchJsDiyuVlVdkuh6LU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786935515; c=relaxed/simple; bh=Im5bKDGdWdK58cOUdZIBLWB9Xnrn4oafP6uQ4FqytMg=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=rEmQuxlzBBHVlKHnd6bxkW3aLSLTvJgfSqIEFknaI55TWHKvnZW1816hAhVe8RZpsi753HuQgTxtc7XMOZtdrHS6S0TTBKjJyjis3RRVkz9gCtjD8CRwTZmOvsP3eB7ZTcJgVnrlEVCA/qEZeIAluRMrMJddjZEIOUrG4x2H5UM= 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=209.85.161.79 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-f79.google.com with SMTP id 006d021491bc7-6ae344f1690so2780286eaf.3 for ; Sun, 16 Aug 2026 19:58:33 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1786935512; x=1787540312; 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=XCSZP/1LVTJiQKs2DQ4Ek3pmmtf6ojeIfOI4bKrApIM=; b=edfbFm/FyBxGDrhE7jjkyXJAsS/potQVRZf9kgJUBxLMEY9m8Q6HU30udaFRA66ZKf RByzs/0Q9Bc4SJCxGFlgi+3G7zE0poPQbC+gHVZ7bmCSo4LFawk/UVkb3NMfATRYjjaF xRs0wjH8vBfMvTxjhm6MLA/rKmBbJdhKQ8aJuIQOGfy77/l/42kyQdnzrlYJOjT+dWID dP9EIqrdE516UTMpBc21UFA2u7jiVL93iGtiPpNmqoi9vIQwK/+lktQeMqubwq3yC40U xRSStm+soVC88TbnMj3R9FusoV3mDQUg5tfoPTeXbUfSs/jdCv1+uIkCvW7H2MISQGBi Qm7Q== X-Forwarded-Encrypted: i=1; AHgh+RrcByAYeBbxeW86Lz9w2DFghl7CPCztW1ktyO43Xt1C1tgp1yua1AkOQaEiNZRfPszvcqtVEkOIimKiXOc=@vger.kernel.org X-Gm-Message-State: AOJu0Yw8SG8mysfCvw1WQ7XL0l+YFV+nu9ctzuleF6EeY7fo4GI0PqvK EGo07mUpvrjyBWQ7mnvlXNTfbkVQ7SechuIpqKBWpxNIYOQ+DIrNcjLNXcF0MTsgrwbHxXd4e9O Qz3X1joWYvdqW5qtk5VCt+mnV2k5A2RmkFRimgb+0VInyySJUxC9yqeDuN2w= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:16a7:b0:6b1:30e:75d6 with SMTP id 006d021491bc7-6b1030e832fmr5979797eaf.20.1786935512503; Sun, 16 Aug 2026 19:58:32 -0700 (PDT) Date: Sun, 16 Aug 2026 19:58:32 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a8278d8.dbb3a75c.20434b.0041.GAE@google.com> Subject: [syzbot] [kernel?] KASAN: slab-use-after-free Read in disable_device From: syzbot To: dakr@kernel.org, driver-core@lists.linux.dev, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 5e6de6a2b522 Add linux-next specific files for 20260811 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=12ef52c6580000 kernel config: https://syzkaller.appspot.com/x/.config?x=dd154b7aa6fe745e dashboard link: https://syzkaller.appspot.com/bug?extid=4393dfdddf166f2de2b0 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/78d1a91d7316/disk-5e6de6a2.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a85543278af6/vmlinux-5e6de6a2.xz kernel image: https://storage.googleapis.com/syzbot-assets/c66856080afa/bzImage-5e6de6a2.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+4393dfdddf166f2de2b0@syzkaller.appspotmail.com smc: removing ib device syz0 smbdirect: ib_dev[syz0] removed ================================================================== BUG: KASAN: slab-use-after- BUG: KASAN: slab-use-after-free in kobject_uevent_net_broadcast+0x12c/0x560 lib/kobject_uevent.c:415 Read of size 8 at addr ffff88807719dd90 by task syz.3.2890/12793 CPU: 0 UID: 0 PID: 12793 Comm: syz.3.2890 Not tainted syzkaller #0 PREEMPT(full) 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 kobject_uevent_net_broadcast+0x12c/0x560 lib/kobject_uevent.c:415 kobject_uevent_env+0x566/0x9e0 lib/kobject_uevent.c:611 device_del+0x74d/0x8f0 drivers/base/core.c:3983 remove_one_compat_dev drivers/infiniband/core/device.c:1036 [inline] remove_compat_devs drivers/infiniband/core/device.c:1047 [inline] disable_device+0x248/0x330 drivers/infiniband/core/device.c:1339 __ib_unregister_device+0x2c9/0x400 drivers/infiniband/core/device.c:1571 ib_unregister_device_and_put+0xb8/0xf0 drivers/infiniband/core/device.c:1636 nldev_dellink+0x39c/0x430 drivers/infiniband/core/nldev.c:1902 rdma_nl_rcv_msg drivers/infiniband/core/netlink.c:-1 [inline] rdma_nl_rcv_skb drivers/infiniband/core/netlink.c:239 [inline] rdma_nl_rcv+0x6ef/0xa40 drivers/infiniband/core/netlink.c:259 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x7bd/0x940 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1900 sock_sendmsg_nosec+0x13a/0x180 net/socket.c:800 __sock_sendmsg net/socket.c:815 [inline] ____sys_sendmsg+0x54e/0x850 net/socket.c:2709 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2763 __sys_sendmsg net/socket.c:2795 [inline] __do_sys_sendmsg net/socket.c:2800 [inline] __se_sys_sendmsg net/socket.c:2798 [inline] __x64_sys_sendmsg+0x1b1/0x290 net/socket.c:2798 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 RIP: 0033:0x7fad7359e0d9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fad744e8028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fad73825fa0 RCX: 00007fad7359e0d9 RDX: 0000000000000000 RSI: 00002000000002c0 RDI: 0000000000000003 RBP: 00007fad73635024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fad73826038 R14: 00007fad73825fa0 R15: 00007fff44643058 Allocated by task 12759: 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+0x321/0x600 mm/slub.c:5563 _kmalloc_noprof include/linux/slab.h:991 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] uevent_net_init+0xdb/0x2d0 lib/kobject_uevent.c:782 ops_init+0x35d/0x5d0 net/core/net_namespace.c:137 setup_net+0x118/0x350 net/core/net_namespace.c:450 copy_net_ns+0x4f9/0x720 net/core/net_namespace.c:583 create_new_namespaces+0x3f0/0x6b0 kernel/nsproxy.c:132 copy_namespaces+0x432/0x4b0 kernel/nsproxy.c:195 copy_process+0x1ec0/0x43e0 kernel/fork.c:2310 kernel_clone+0x2d7/0x940 kernel/fork.c:2766 __do_sys_clone kernel/fork.c:2908 [inline] __se_sys_clone kernel/fork.c:2892 [inline] __x64_sys_clone+0x1b6/0x230 kernel/fork.c:2892 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 Freed by task 12759: 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:2748 [inline] slab_free mm/slub.c:6499 [inline] kfree+0x1c5/0x650 mm/slub.c:6792 ops_exit_list net/core/net_namespace.c:200 [inline] ops_undo_list+0x43d/0x8d0 net/core/net_namespace.c:253 setup_net+0x2f6/0x350 net/core/net_namespace.c:466 copy_net_ns+0x4f9/0x720 net/core/net_namespace.c:583 create_new_namespaces+0x3f0/0x6b0 kernel/nsproxy.c:132 copy_namespaces+0x432/0x4b0 kernel/nsproxy.c:195 copy_process+0x1ec0/0x43e0 kernel/fork.c:2310 kernel_clone+0x2d7/0x940 kernel/fork.c:2766 __do_sys_clone kernel/fork.c:2908 [inline] __se_sys_clone kernel/fork.c:2892 [inline] __x64_sys_clone+0x1b6/0x230 kernel/fork.c:2892 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 The buggy address belongs to the object at ffff88807719dd80 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 16 bytes inside of freed 32-byte region [ffff88807719dd80, ffff88807719dda0) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88807719de00 pfn:0x7719d flags: 0xfff00000000200(workingset|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000200 ffff88801b005780 ffffea0001ddee90 ffffea0001d3c010 raw: ffff88807719de00 0000000000400032 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 0xd2800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5763, tgid 5763 (modprobe), ts 88225820550 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1871 prep_new_page mm/page_alloc.c:1879 [inline] get_page_from_freelist+0x2209/0x2280 mm/page_alloc.c:3943 __alloc_frozen_pages_noprof+0x217/0x5a0 mm/page_alloc.c:5436 alloc_slab_page mm/slub.c:3347 [inline] allocate_slab+0x7d/0x620 mm/slub.c:3462 new_slab mm/slub.c:3513 [inline] refill_objects+0x2d5/0x350 mm/slub.c:7410 refill_sheaf mm/slub.c:2885 [inline] __pcs_replace_empty_main+0x2c8/0x6c0 mm/slub.c:4774 alloc_from_pcs mm/slub.c:4850 [inline] slab_alloc_node mm/slub.c:4984 [inline] __kmalloc_cache_noprof+0x39b/0x600 mm/slub.c:5559 _kmalloc_noprof include/linux/slab.h:991 [inline] slab_free_hook mm/slub.c:2700 [inline] slab_free mm/slub.c:6499 [inline] kmem_cache_free+0x156/0x650 mm/slub.c:6626 anon_vma_free mm/rmap.c:137 [inline] __put_anon_vma+0x12b/0x2d0 mm/rmap.c:2970 put_anon_vma mm/internal.h:293 [inline] unlink_anon_vmas+0x544/0x720 mm/rmap.c:536 free_pgtables+0x836/0xb70 mm/memory.c:414 exit_mmap+0x4aa/0x9f0 mm/mmap.c:1327 __mmput+0x118/0x420 kernel/fork.c:1193 exit_mm+0x221/0x2d0 kernel/exit.c:614 do_exit+0x6cd/0x2360 kernel/exit.c:996 do_group_exit+0x22d/0x2f0 kernel/exit.c:1151 page last free pid 5633 tgid 5633 ts 88208835587 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1418 [inline] __free_frozen_pages+0xc93/0xd90 mm/page_alloc.c:2962 rcu_do_batch kernel/rcu/tree.c:2650 [inline] rcu_core+0x926/0x1260 kernel/rcu/tree.c:2919 handle_softirqs+0x226/0x860 kernel/softirq.c:645 do_softirq+0x77/0xd0 kernel/softirq.c:546 __local_bh_enable_ip+0x100/0x140 kernel/softirq.c:473 local_bh_enable include/linux/bottom_half.h:33 [inline] __alloc_skb+0x1b1/0x7a0 net/core/skbuff.c:699 alloc_skb include/linux/skbuff.h:1384 [inline] nlmsg_new include/net/netlink.h:1055 [inline] inet6_ifa_notify net/ipv6/addrconf.c:5646 [inline] __ipv6_ifa_notify+0x1d0/0xc60 net/ipv6/addrconf.c:6306 ipv6_ifa_notify net/ipv6/addrconf.c:6358 [inline] inet6_addr_add+0x6b4/0xb50 net/ipv6/addrconf.c:3085 inet6_rtm_newaddr+0x9fc/0xe00 net/ipv6/addrconf.c:5094 rtnetlink_rcv_msg+0x802/0xc00 net/core/rtnetlink.c:7132 netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2556 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x7bd/0x940 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1900 sock_sendmsg_nosec+0x13a/0x180 net/socket.c:800 __sock_sendmsg net/socket.c:815 [inline] __sys_sendto+0x408/0x5a0 net/socket.c:2277 __do_sys_sendto net/socket.c:2284 [inline] __se_sys_sendto net/socket.c:2280 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2280 Memory state around the buggy address: ffff88807719dc80: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ffff88807719dd00: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc >ffff88807719dd80: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc ^ ffff88807719de00: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ffff88807719de80: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ================================================================== --- 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