From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo2-f11.google.com (mail-oo2-f11.google.com [74.125.231.139]) (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 1A5B51862 for ; Sun, 13 Sep 2026 01:31:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.231.139 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789263096; cv=none; b=kPsi6XU7c2tZfNTggJxECM5IaAmY1FfKSDlPi5ehCadks7flTxuwlZibaMV5fXIdVrecbMqHkc2P0g5TIIYJwqQkvPVHcpAQtdRSrRuOt14bisnRgtXG4vXYbMmjpMyutyqDe6bp++k9UBi10x7jimDRUdq4fX9n82OItq+3IeE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789263096; c=relaxed/simple; bh=95MGt0HZYqffJwT5rtnedtXz7zhgit7A214Ryl4v+xs=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=pk2X67jxeDMtv7d7z9CV/1AbqqkamnprancfbBj6oPT5nW8yHmOlOkT18lMDd25ZvrbJ+quAGf8VzFbYJRqMzUvz04HClnnIIt1mWcLmS6UIw4Zi8vinXvsWF2XFeIM+C5J1CVzZZNDirOML1fO5qXuS6flMmoJrfX5QgIiUo/E= 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=74.125.231.139 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-oo2-f11.google.com with SMTP id 46e09a7af769-8069d92e182so167883a34.0 for ; Sat, 12 Sep 2026 18:31:34 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1789263094; x=1789867894; 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=RMsHE5/zXRdmTcppBYZecH1Szld/jb42UiBCQemOLyc=; b=SPilyGCSpX5Z0PtKzo9CCIVIEs+1CmGcmrk8YpJU/oqihI/EtcWGtavgNbYdktN//b SCd2eOpmiBWgZkBI1TQHfQ9ps8L2F94p62Dmcqu55zFoX18wnt58vszJC3DANQEYsRPQ 1ZE8z8PiwK4uW/WgKEP4WVlR2CABWH8JAUOxUmcErM+sWHQDzWUFv8m23Tu9rp9WqEIN 85tsUfQXmJcLT7qxf12zyXnKQ233oSN0e3LvrWm6yp6/xmrox9eUhQjRSfzssyVQbXKI VqqgZqUsVDxmIYlRlxWRAS1ChJAXLty5CrO/t1TwJPqqhQR2l4bCxZJVBK9Mvj5lABqo ercg== X-Forwarded-Encrypted: i=1; AKwUvBzLBOLV556Fc7+SaBK3GBHakBvb/1itEKeq5yX5sLoPIEKWZk/Hs8uJEy3XD2KKogo/1oOpVjg2mwmwdlU=@vger.kernel.org X-Gm-Message-State: AFuF++knoiB9fyujw6aIKjR/EICy5Wd4QxSOncou5j3VHxDhZu9kktg5 lMozurxmo4vl18FS1AMZMiDL+aWELGAzmd6cFeoLCOq7KTOONY1zI0MpK1WklMcZuPyOvYbM3Zp jzZHBIxZS1zk5nh8dC74fYrsaOKx/icySX3t2TTetxXQlhf3t1gx5ExOnjO4= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:810b:b0:6c1:6080:f32f with SMTP id 006d021491bc7-6c24f650f4dmr2428675eaf.64.1789263094127; Sat, 12 Sep 2026 18:31:34 -0700 (PDT) Date: Sat, 12 Sep 2026 18:31:34 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6aa5fcf6.f2639fcc.29487d.0048.GAE@google.com> Subject: [syzbot] [bridge?] WARNING: locking bug in match_held_lock From: syzbot To: bridge@lists.linux.dev, davem@davemloft.net, edumazet@google.com, herbert@gondor.apana.org.au, horms@kernel.org, idosch@nvidia.com, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, razor@blackwall.org, steffen.klassert@secunet.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: a9d7ced84989 Add linux-next specific files for 20260908 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=10880f49580000 kernel config: https://syzkaller.appspot.com/x/.config?x=17eeb09695a2b3c9 dashboard link: https://syzkaller.appspot.com/bug?extid=4d0e4d2db6dfde01b52f 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/4f470407358e/disk-a9d7ced8.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/858b9d7ba687/vmlinux-a9d7ced8.xz kernel image: https://storage.googleapis.com/syzbot-assets/ef971d22d75f/bzImage-a9d7ced8.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+4d0e4d2db6dfde01b52f@syzkaller.appspotmail.com ------------[ cut here ]------------ Looking for class "&ht->mutex" with key xfrm_policy_init.__key.84, but found a different class "key" with the same key WARNING: kernel/locking/lockdep.c:958 at look_up_lock_class+0x8c/0x110 kernel/locking/lockdep.c:955, CPU#1: kworker/1:6/5751 Modules linked in: CPU: 1 UID: 0 PID: 5751 Comm: kworker/1:6 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Workqueue: usb_hub_wq hub_event RIP: 0010:look_up_lock_class+0x9a/0x110 kernel/locking/lockdep.c:955 Code: 00 00 49 3b 46 18 0f 84 82 00 00 00 49 81 3e d0 44 58 94 74 79 48 8d 3d 44 f2 94 04 49 8b 16 49 8b 76 18 48 8b 8b b8 00 00 00 <67> 48 0f b9 3a eb 5d 90 89 f3 e8 67 0a f4 f8 e8 32 5c be f5 48 c7 RSP: 0018:ffffc90000a38070 EFLAGS: 00010002 RAX: ffffffff8c6bb940 RBX: ffffffff94478508 RCX: ffffffff8c6bb940 RDX: ffffffff9af23440 RSI: ffffffff8c6bb900 RDI: ffffffff907ddb20 RBP: 00000000ffffffff R08: 0000000000000100 R09: 0000000000000004 R10: 0000000000000003 R11: 0000000000000300 R12: 0000000000000246 R13: ffff8880307a8000 R14: ffffffff9af232c8 R15: ffffffff9af23440 FS: 0000000000000000(0000) GS:ffff888124db7000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b3401aff8 CR3: 0000000074540000 CR4: 00000000003526f0 Call Trace: match_held_lock+0x9a/0x120 kernel/locking/lockdep.c:5364 __lock_is_held kernel/locking/lockdep.c:5654 [inline] lock_is_held_type+0x89/0x150 kernel/locking/lockdep.c:6016 __rhashtable_lookup include/linux/rhashtable.h:623 [inline] rhashtable_lookup include/linux/rhashtable.h:668 [inline] xfrm_policy_inexact_lookup_rcu+0x60/0x750 net/xfrm/xfrm_policy.c:2068 xfrm_policy_lookup_bytype+0xb35/0x1840 net/xfrm/xfrm_policy.c:2193 xfrm_policy_lookup net/xfrm/xfrm_policy.c:2225 [inline] xfrm_bundle_lookup net/xfrm/xfrm_policy.c:3100 [inline] xfrm_lookup_with_ifid+0x416/0x1db0 net/xfrm/xfrm_policy.c:3241 xfrmi_xmit2 net/xfrm/xfrm_interface_core.c:456 [inline] xfrmi_xmit+0x72d/0x1b80 net/xfrm/xfrm_interface_core.c:572 __netdev_start_xmit include/linux/netdevice.h:5433 [inline] netdev_start_xmit include/linux/netdevice.h:5442 [inline] xmit_one net/core/dev.c:3937 [inline] dev_hard_start_xmit+0x2cd/0x830 net/core/dev.c:3953 __dev_queue_xmit+0x14c0/0x3820 net/core/dev.c:4926 NF_HOOK_COND include/linux/netfilter.h:314 [inline] ip6_output+0x337/0x540 net/ipv6/ip6_output.c:248 dst_output include/net/dst.h:471 [inline] NF_HOOK include/linux/netfilter.h:325 [inline] ndisc_send_skb+0xcb2/0x1650 net/ipv6/ndisc.c:513 addrconf_rs_timer+0x2d2/0x6c0 net/ipv6/addrconf.c:4078 call_timer_fn+0x18d/0x5f0 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2374 [inline] __run_timer_base+0x652/0x8b0 kernel/time/timer.c:2386 run_timer_base kernel/time/timer.c:2395 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2405 handle_softirqs+0x223/0x840 kernel/softirq.c:645 __do_softirq kernel/softirq.c:679 [inline] invoke_softirq kernel/softirq.c:519 [inline] __irq_exit_rcu+0xcb/0x220 kernel/softirq.c:758 irq_exit_rcu+0x9/0x30 kernel/softirq.c:775 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:finish_task_switch+0x413/0xc60 kernel/sched/core.c:5378 Code: 04 00 00 41 c7 84 24 20 0e 00 00 00 00 00 00 0f 1f 44 00 00 49 83 c4 48 4c 89 e7 e8 57 48 55 0a e8 d2 1b 3a 00 fb 4c 8b 65 c8 <49> 8d bc 24 10 17 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 RSP: 0018:ffffc900043ad940 EFLAGS: 00000206 RAX: 000000000004ba5f RBX: ffff8880b873cb20 RCX: 8000000000000001 RDX: 0000000000000006 RSI: ffffffff8e47d8da RDI: ffffffff8c6dc080 RBP: ffffc900043ad990 R08: ffffffff907a9cbf R09: 1ffffffff20f5397 R10: dffffc0000000000 R11: fffffbfff20f5398 R12: ffff8880307a8000 R13: ffff8880b873cae8 R14: dffffc0000000000 R15: 1ffff110170e7964 context_switch kernel/sched/core.c:5530 [inline] __schedule+0x17e5/0x5940 kernel/sched/core.c:7295 preempt_schedule_common+0x7f/0xd0 kernel/sched/core.c:7474 preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12 __mutex_lock_common kernel/locking/mutex.c:656 [inline] __mutex_lock+0x31b/0x15a0 kernel/locking/mutex.c:821 clear_eld drivers/gpu/drm/drm_edid.c:5691 [inline] update_display_info+0x455/0x9630 drivers/gpu/drm/drm_edid.c:6934 drm_edid_connector_update+0x9b/0x13d0 drivers/gpu/drm/drm_edid.c:7338 drm_connector_update_edid_property+0xde/0x140 drivers/gpu/drm/drm_edid.c:7396 drm_helper_probe_single_connector_modes+0x126b/0x1880 drivers/gpu/drm/drm_probe_helper.c:644 drm_client_modeset_probe+0x4e8/0x60c0 drivers/gpu/drm/drm_client_modeset.c:869 __drm_fb_helper_initial_config_and_unlock+0x10e/0x1b50 drivers/gpu/drm/drm_fb_helper.c:1717 drm_fbdev_client_hotplug+0x16c/0x230 drivers/gpu/drm/clients/drm_fbdev_client.c:66 drm_client_register+0x16e/0x200 drivers/gpu/drm/drm_client.c:143 drm_fbdev_client_setup+0x1a0/0x450 drivers/gpu/drm/clients/drm_fbdev_client.c:168 drm_client_setup+0x107/0x220 drivers/gpu/drm/clients/drm_client_setup.c:46 udl_usb_probe+0x137/0x150 drivers/gpu/drm/udl/udl_drv.c:105 usb_probe_interface+0x788/0xe50 drivers/usb/core/driver.c:399 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+0x258/0x2f0 drivers/base/bus.c:500 __device_attach+0x2c4/0x450 drivers/base/dd.c:1098 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1153 bus_probe_device+0x12a/0x220 drivers/base/bus.c:620 device_add+0x7d7/0xb80 drivers/base/core.c:3776 usb_set_configuration+0x1ad8/0x2180 drivers/usb/core/message.c:2268 usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250 usb_probe_device+0x1c3/0x3b0 drivers/usb/core/driver.c:293 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+0x258/0x2f0 drivers/base/bus.c:500 __device_attach+0x2c4/0x450 drivers/base/dd.c:1098 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1153 bus_probe_device+0x12a/0x220 drivers/base/bus.c:620 device_add+0x7d7/0xb80 drivers/base/core.c:3776 usb_new_device+0x9aa/0x1690 drivers/usb/core/hub.c:2708 hub_port_connect drivers/usb/core/hub.c:5580 [inline] hub_port_connect_change drivers/usb/core/hub.c:5720 [inline] port_event drivers/usb/core/hub.c:5884 [inline] hub_event+0x28e8/0x4d30 drivers/usb/core/hub.c:5966 process_one_work kernel/workqueue.c:3407 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3490 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3571 kthread+0x38b/0x480 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 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 49 3b 46 18 cmp 0x18(%r14),%rax 6: 0f 84 82 00 00 00 je 0x8e c: 49 81 3e d0 44 58 94 cmpq $0xffffffff945844d0,(%r14) 13: 74 79 je 0x8e 15: 48 8d 3d 44 f2 94 04 lea 0x494f244(%rip),%rdi # 0x494f260 1c: 49 8b 16 mov (%r14),%rdx 1f: 49 8b 76 18 mov 0x18(%r14),%rsi 23: 48 8b 8b b8 00 00 00 mov 0xb8(%rbx),%rcx * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: eb 5d jmp 0x8e 31: 90 nop 32: 89 f3 mov %esi,%ebx 34: e8 67 0a f4 f8 call 0xf8f40aa0 39: e8 32 5c be f5 call 0xf5be5c70 3e: 48 rex.W 3f: c7 .byte 0xc7 --- 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