From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo2-f0.google.com (mail-oo2-f0.google.com [74.125.231.128]) (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 CA11F3B0AE7 for ; Wed, 2 Sep 2026 07:43:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.231.128 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788335021; cv=none; b=BWiVSDjuVp/Gton+bX+J2psgdI9J+MjmGml3XU7p/Kcwv32qzfZis0EFhaMpRvN8Y5wC1iU0CeME4vHM8s/flOk3HdKc3Cng9CG4TENfcSlDEg8RPnfNaQwPVeenswg2ElvgIKiIrCPraFZ1hygwcOGPvOgODH6vfOC17vvMFSY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788335021; c=relaxed/simple; bh=RleU7cNN1wOfOHEFXMjowd8IIs6GlYKSm1VisDWm+6U=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=UlhXNXZUsnH4b3pBEim2XWaMYKJgbTMV78IVT2HS+xgQ0Vv57YyIKur8xQ1buR7cAzLFn6/huXLA3SPvs/GV1h7y0o5ob45tRhveKHEBWQjMAYML/R1d7bDNp0Xiqyjh/fO9gPzzLegxaExo0t7Xj4isGPakW3OVvmtUIcXanLE= 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=74.125.231.128 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-f0.google.com with SMTP id 006d021491bc7-6a3900cb2b5so268227eaf.0 for ; Wed, 02 Sep 2026 00:43:39 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1788335019; x=1788939819; 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=+Fyr7GjnemiBK6OzWbgukemJrSOlrcphd1h+NIeU+Ak=; b=IOPZ41kfZR8EWl8AaE5xvr3WAdbbUf+1WGqqNEjw4OSjClEfLz2skW2gQcqpsZV8G0 O5BnzsYIWghZY423OlNU+siiDI5+QyvYyg6325eCmdRN5tft/HUbqPBfj3yjzpTaKpIL +rk22DG3ubCv0CznZRbNCzOqQ9dncx9ZKwEUwnm6sQ+c0rt6WoE19SHUJJduxpSvjF5J CrQG2fDDke4e1RTlFx5Eo4Q9q3bojrZ/f3KDqJdo4jg6p2FxqPtS+Q2I7g3ivroyWnfr UJiKJ2MD7d0jJRiK9VA1tpz1MwfIiQZmASdbDvLXRvAnAnKFbsYVYaIycJl+LqPpnIVU qsQw== X-Forwarded-Encrypted: i=1; AHgh+Rp6fW3+2xhdO00iqDUyWYAW0EgDuz/pp4FG/nRNgmh37abMXRZDg8yDBUVR8y7QeFmiG1e1p5o=@vger.kernel.org X-Gm-Message-State: AFuF++nREdemShZPeAA6oSxbM0BTTdTHUjW7RasaA2QlPduBFGM6pQry gV+4h+lgR8K2NqpoIGbTkzPhGqw2CRKc/ExFbmHEi+Cvbfw58ZjT6pagWH70C0N6gGjmbV76Vqb Kh7aCrlglu4+JWOvHOstX9HeDFb8RlxE95//clcz02FK7yK8spd9OSZ/BY50= Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:168f:b0:6b1:9f9d:79f3 with SMTP id 006d021491bc7-6b47e7beac8mr2231224eaf.17.1788335018735; Wed, 02 Sep 2026 00:43:38 -0700 (PDT) Date: Wed, 02 Sep 2026 00:43:38 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a97d3aa.e163c37b.143a1.0007.GAE@google.com> Subject: [syzbot] [openvswitch?] INFO: task hung in ovs_dp_masks_rebalance (8) From: syzbot To: aconole@redhat.com, davem@davemloft.net, dev@openvswitch.org, echaudro@redhat.com, edumazet@google.com, horms@kernel.org, i.maximets@ovn.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: a23cbb05744b Merge tag 'timers-urgent-2026-08-30' of git:/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1107a379580000 kernel config: https://syzkaller.appspot.com/x/.config?x=5e4e3a0e188a497e dashboard link: https://syzkaller.appspot.com/bug?extid=75ce0a9129024fa8cbf6 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/eed599d932fb/disk-a23cbb05.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/74e8c268c325/vmlinux-a23cbb05.xz kernel image: https://storage.googleapis.com/syzbot-assets/aa91aebf1baf/bzImage-a23cbb05.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+75ce0a9129024fa8cbf6@syzkaller.appspotmail.com INFO: task kworker/0:0:9 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:0 state:D stack:22128 pid:9 tgid:9 ppid:2 task_flags:0x4208060 flags:0x00080000 Workqueue: events ovs_dp_masks_rebalance Call Trace: context_switch kernel/sched/core.c:5520 [inline] __schedule+0x17db/0x58f0 kernel/sched/core.c:7270 __schedule_loop kernel/sched/core.c:7347 [inline] schedule+0x164/0x2b0 kernel/sched/core.c:7362 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7419 __mutex_lock_common kernel/locking/mutex.c:726 [inline] __mutex_lock+0x7c1/0x1550 kernel/locking/mutex.c:821 ovs_lock net/openvswitch/datapath.c:108 [inline] ovs_dp_masks_rebalance+0x2f/0xe0 net/openvswitch/datapath.c:2602 process_one_work kernel/workqueue.c:3387 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3470 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3551 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 INFO: task kworker/u8:1:13 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u8:1 state:D stack:22376 pid:13 tgid:13 ppid:2 task_flags:0x4208060 flags:0x00080000 Workqueue: ipv6_addrconf addrconf_verify_work Call Trace: context_switch kernel/sched/core.c:5520 [inline] __schedule+0x17db/0x58f0 kernel/sched/core.c:7270 __schedule_loop kernel/sched/core.c:7347 [inline] schedule+0x164/0x2b0 kernel/sched/core.c:7362 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7419 __mutex_lock_common kernel/locking/mutex.c:726 [inline] __mutex_lock+0x7c1/0x1550 kernel/locking/mutex.c:821 rtnl_net_lock include/linux/rtnetlink.h:134 [inline] addrconf_verify_work+0x19/0x30 net/ipv6/addrconf.c:4770 process_one_work kernel/workqueue.c:3387 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3470 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3551 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 INFO: task kworker/u8:2:27 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u8:2 state:D stack:23808 pid:27 tgid:27 ppid:2 task_flags:0x4208060 flags:0x00080000 Workqueue: netns cleanup_net Call Trace: context_switch kernel/sched/core.c:5520 [inline] __schedule+0x17db/0x58f0 kernel/sched/core.c:7270 __schedule_loop kernel/sched/core.c:7347 [inline] schedule+0x164/0x2b0 kernel/sched/core.c:7362 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7419 __mutex_lock_common kernel/locking/mutex.c:726 [inline] __mutex_lock+0x7c1/0x1550 kernel/locking/mutex.c:821 ops_exit_rtnl_list net/core/net_namespace.c:173 [inline] ops_undo_list+0x28e/0x8d0 net/core/net_namespace.c:249 cleanup_net+0x572/0x810 net/core/net_namespace.c:706 process_one_work kernel/workqueue.c:3387 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3470 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3551 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 INFO: task kworker/1:1:31 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:1 state:D stack:22232 pid:31 tgid:31 ppid:2 task_flags:0x4208060 flags:0x00080000 Workqueue: events ovs_dp_masks_rebalance Call Trace: --- 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