From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f198.google.com (mail-oi1-f198.google.com [209.85.167.198]) (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 4ED7F3A4F26 for ; Sat, 26 Sep 2026 20:12:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.198 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790453560; cv=none; b=avFZiEr/Ic5HRqda0DGDVuqB0GQ5BxJDKqL1zfCO/2lB1gPYNjlju4rCl0EUAjHrrxg1TFkld3Q6mh1oCq4sOYVBRyy9LH6e4EJMdkex8GjpyHfe0eZhvgcZxB1+VsAybIEdpSgAeY48oge01+hrLUyXxpQXQRjiZs2tM+fHWU4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790453560; c=relaxed/simple; bh=KrqAEzECgiUFL/pJcmc7/mUSV9tGrf+20pUN7qnrF3A=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To:Cc: Content-Type; b=eyechdbv3uxD+2GAhabwDta74j//KnoEIQAeu3kQU76tZh0Ot5lzTTfX6qtK/1NG5I23uP7U30O/OE8cxLULiboykJF61Fdva1Jcxvi8AhWCEuWdy9a9/oBtMLnyDBCLcmwN1Cmo2H84w1FCOnI4B+W/sDMzoM91HsZD0QekN+I= 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=209.85.167.198 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-oi1-f198.google.com with SMTP id 5614622812f47-4cc691d106fso2992511b6e.1 for ; Sat, 26 Sep 2026 13:12:30 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1790453548; x=1791058348; h=content-type:cc:to:from:subject:message-id:in-reply-to:date :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to:content-type; bh=3X22zhN6f9uRMNSR7GwIXXr+DjResBRWtpt3aWN0XfE=; b=cptQ4cG8IIC9JPNGNHdZv4ugzXQQ7lu7APnMPKvksls4PZjc3HOmyn3FF92G/jEVWs BK+XkbSQph8UGEebX3FgvUcGmnnchrQTo2MiMwlB5VYCsvCrDlod/w7eLXXodkEfT/cH w8olhyMfqKjU64x6fR71BtkYmee7/LmthLQHoMiOlptsjy2Lit1ObgeMPtREfmPjZ59s d40AixkJodENSW/jPI1Lb0HW/JqZaLhMuaayjtE5jLUWp/YPQdMWV5dilTS7cNv9SX/X S2DhdcH2zH9L1oWG8U4G5yQT7CqLfTmgEX6gW6UjcZrLiVamS/t91kIgqdtAac3oq79O 1Mng== X-Forwarded-Encrypted: i=1; AKwUvBxfnAQg2dgRWICyeN2xYIs3Q+KSMPxHjti7ZG7nVqfXflit8kqERC26JdOt5hk2c1Zv8oXRQyg=@vger.kernel.org X-Gm-Message-State: AFuF++mdrgRmGrVvGOneeVbyC19ZCn4ubC/qn5PiDFiqq6O8IARCWB/K JZw9aRMZaKTwCFmljknkYx8Vv+Ryncx29su3WJb8voIIQLcA8Yr2L5q3ZjsEceDFXqAyEinEQvd s112JzK+N7GFMCzxgSOgG25A+dhk+ascg1oUWv8zohE3w8SoMEUGSavG2tS0= Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:1993:b0:4d6:90d3:e185 with SMTP id 5614622812f47-4d72e670404mr13218907b6e.46.1790453548022; Sat, 26 Sep 2026 13:12:28 -0700 (PDT) Date: Sat, 26 Sep 2026 13:12:28 -0700 In-Reply-To: <20260924063312.1194019-1-chenguang.zhao@linux.dev> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6ab8272c.dc2998a4.2261f5.0058.GAE@google.com> Subject: [syzbot ci] Re: ipvs: fix infinite loop with ipvlan L3 from unconditional ipvs_property clear From: syzbot ci To: chenguang.zhao@linux.dev, davem@davemloft.net, dsahern@kernel.org, edumazet@google.com, horms@kernel.org, idosch@nvidia.com, kerneljasonxing@gmail.com, kuba@kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzbot@syzkaller.appspotmail.com, zhaochenguang@kylinos.cn Cc: syzbot@lists.linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot ci has tested the following series [v1] ipvs: fix infinite loop with ipvlan L3 from unconditional ipvs_property clear https://lore.kernel.org/all/20260924063312.1194019-1-chenguang.zhao@linux.dev * [PATCH net] ipvs: fix infinite loop with ipvlan L3 from unconditional ipvs_property clear and found the following issue: INFO: task hung in netdev_run_todo Full report is available here: https://ci.syzbot.org/series/b6478e5d-791e-4d72-8b8d-0fa748c90168 *** INFO: task hung in netdev_run_todo tree: net URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/net.git base: e7e0a54300a896e731dffd3e2e8dae5631d6243d arch: amd64 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 config: https://ci.syzbot.org/builds/9865431b-add2-4883-97e2-de4ec60d969e/config INFO: task syz-executor:31961 blocked for more than 144 seconds. Not tainted syzkaller #0 Blocked by coredump. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:26120 pid:31961 tgid:31961 ppid:1 task_flags:0x40054c flags:0x00080003 Call Trace: __schedule+0x17db/0x58f0 schedule+0x164/0x2b0 schedule_preempt_disabled+0x13/0x30 __mutex_lock+0x7c1/0x1550 rcu_barrier+0x4c/0x530 netdev_run_todo+0x2fc/0x1060 tun_chr_close+0x13c/0x1c0 __fput+0x418/0xa50 task_work_run+0x1d9/0x270 do_exit+0x73a/0x2360 do_group_exit+0x22d/0x2f0 get_signal+0x121b/0x12c0 arch_do_signal_or_restart+0xbb/0x860 exit_to_user_mode_loop+0x10e/0x770 do_syscall_64+0x328/0x520 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f4b2cf9ddeb RSP: 002b:00007ffedfbd6b60 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: 0000000000000000 RBX: 00007ffedfbd6c10 RCX: 00007f4b2cf9ddeb RDX: 00007ffedfbd6be0 RSI: 00000000400454ca RDI: 00000000000000c8 RBP: 00007f4b2d0359ad R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000008 R13: 0000000000000003 R14: 00007ffedfbd6f08 R15: 0000000000000000 Showing all locks held in the system: locks held by kworker/u8:1/13: 3, on CPU#1: #0: ffff88817721b940 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 #1: ffffc90000127c40 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 #2: ffffffff90253600 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_verify_work+0x19/0x30 locks held by khungtaskd/35: 1, last CPU#1: #0: ffffffff8ed5c8a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 locks held by getty/5419: 2, on CPU#1: #0: ffff88817a7b30a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 #1: ffffc900027682e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360 locks held by kworker/u8:4/9945: 2, last CPU#1: #0: ffff888177d09940 ((wq_completion)bat_events){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 #1: ffffc90006db7c40 ((work_completion)(&(&bat_priv->tt.work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 locks held by kworker/u8:5/19085: 4, last CPU#1: #0: ffff88817741f940 ((wq_completion)krds_cp_wq#12/0){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 #1: ffffc90003a0fc40 ((work_completion)(&(&cp->cp_conn_w)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 #2: ffff888169e6a180 (&tc->t_conn_path_lock){+.+.}-{4:4}, at: rds_tcp_conn_path_connect+0x1cc/0x920 #3: ffff888192303660 (k-sk_lock-AF_INET){+.+.}-{0:0}, at: rds_tcp_tune+0x220/0x920 locks held by kworker/u10:0/25329: 3, on CPU#1: #0: ffff8881000ac140 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 #1: ffffc9000418fc40 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 #2: ffffffff90253600 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60 locks held by kworker/0:1/27790: 7, last CPU#0: #0: ffff88810006a940 ((wq_completion)events_long){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 #1: ffffc9000141fc40 ((work_completion)(&(&br->gc_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 #2: ffffffff8ed5c8a0 (rcu_read_lock){....}-{1:3}, at: process_backlog+0x3de/0x18b0 #3: ffffffff8ed5c8a0 (rcu_read_lock){....}-{1:3}, at: NF_HOOK+0x9e/0x3c0 #4: ffffffff8ed5c8a0 (rcu_read_lock){....}-{1:3}, at: ip_route_output_key_hash+0xd8/0x2a0 #5: ffff888121028298 (hrtimer_bases.lock){-.-.}-{2:2}, at: __hrtimer_rearm_deferred+0x99/0x4b0 #6: ffffffff9aa29748 (&____s->seqcount#2){----}-{0:0}, at: __ip_vs_conn_in_get+0x2db/0x10f0 locks held by syz.0.7664/31917: 1, on CPU#1: #0: ffffffff90253600 (rtnl_mutex){+.+.}-{4:4}, at: tun_chr_close+0x3e/0x1c0 locks held by syz.3.7666/31925: 1, on CPU#1: #0: ffffffff8ed62b38 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x530 locks held by syz.2.7668/31938: 1, on CPU#1: #0: ffffffff8ed62b38 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x530 locks held by syz-executor/31955: 1, on CPU#1: #0: ffffffff8ed62b38 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x530 locks held by syz-executor/31961: 1, on CPU#1: #0: ffffffff8ed62b38 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x530 locks held by kworker/u8:7/31997: 4, on CPU#1: #0: ffff8881012d5940 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 #1: ffffc900079cfc40 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 #2: ffffffff90244da8 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf5/0x810 #3: ffffffff90253600 (rtnl_mutex){+.+.}-{4:4}, at: ops_undo_list+0x28e/0x8d0 locks held by syz-executor/31998: 1, on CPU#1: #0: ffffffff8ed62b38 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x530 locks held by syz-executor/32005: 1, on CPU#1: #0: ffffffff90253600 (rtnl_mutex){+.+.}-{4:4}, at: tun_chr_close+0x3e/0x1c0 locks held by syz-executor/32009: 1, last CPU#1: #0: ffffffff90253600 (rtnl_mutex){+.+.}-{4:4}, at: tun_chr_close+0x3e/0x1c0 locks held by syz-executor/32074: 1, on CPU#1: #0: ffffffff90253600 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0xc10/0x1c30 locks held by syz-executor/32077: 1, on CPU#1: #0: ffffffff90253600 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0xc10/0x1c30 locks held by syz-executor/32095: 2, last CPU#1: #0: ffff88816f5b1d38 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x1a4/0x9f0 #1: ffffffff8ed5c8a0 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x29/0x240 locks held by syz-executor/32096: 1, on CPU#1: #0: ffffffff90253600 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x470/0x19f0 locks held by syz-executor/32103: 1, on CPU#1: #0: ffffffff90253600 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x470/0x19f0 locks held by syz-executor/32108: 1, on CPU#1: #0: ffffffff90253600 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x470/0x19f0 locks held by syz-executor/32116: 2, last CPU#1: #0: ffff88817a26d038 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x1dd/0x4e0 #1: ffffffff8ed5c8a0 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x29/0x240 ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 35 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: dump_stack_lvl+0xe8/0x150 nmi_cpu_backtrace+0x274/0x2d0 nmi_trigger_cpumask_backtrace+0x17d/0x390 sys_info+0x135/0x170 watchdog+0xfd7/0x1030 kthread+0x38b/0x480 ret_from_fork+0x514/0xb70 ret_from_fork_asm+0x1a/0x30 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 27790 Comm: kworker/0:1 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Workqueue: events_long br_fdb_cleanup RIP: 0010:lock_acquire+0x232/0x350 Code: ff ff ff e8 50 28 42 0a f7 44 24 10 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 a2 e3 f1 11 48 3b 44 24 50 75 33 fb 48 83 c4 58 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 bf 2c 45 0a cc 48 8d 3d 67 4e da RSP: 0018:ffffc90000006dc0 EFLAGS: 00000296 RAX: 32f582729c8e9900 RBX: 0000000000000000 RCX: 8000000000000100 RDX: 00000000071bee9f RSI: ffffffff8e69ca38 RDI: ffffffff8c6da580 RBP: ffff888112a39e00 R08: ffffffff8177f1df R09: 0000000000000000 R10: ffffc90000006ef8 R11: ffffffff81b28790 R12: ffffffff8ed5c8a0 R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000246 FS: 0000000000000000(0000) GS:ffff88818d6cf000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000040 CR3: 000000000eb48000 CR4: 00000000000006f0 Call Trace: unwind_next_frame+0xac/0x2550 arch_stack_walk+0x11b/0x150 stack_trace_save+0xa9/0x100 kasan_save_track+0x3e/0x80 __kasan_slab_alloc+0x6c/0x80 kmem_cache_alloc_node_noprof+0x354/0x610 __alloc_skb+0x1db/0x7a0 synproxy_send_client_synack+0x175/0xde0 nft_synproxy_eval_v4+0x362/0x4e0 nft_synproxy_do_eval+0x335/0x550 nft_do_chain+0x132b/0x1b10 nft_do_chain_ipv4+0x195/0x290 nf_hook_slow+0xc5/0x220 NF_HOOK+0x21f/0x3c0 NF_HOOK+0x336/0x3c0 process_backlog+0xa6b/0x18b0 __napi_poll+0xaa/0x330 net_rx_action+0x61d/0xf50 handle_softirqs+0x226/0x860 __irq_exit_rcu+0xcb/0x220 irq_exit_rcu+0x9/0x30 sysvec_apic_timer_interrupt+0xa6/0xc0 asm_sysvec_apic_timer_interrupt+0x1a/0x20 RIP: 0010:lock_acquire+0x232/0x350 Code: ff ff ff e8 50 28 42 0a f7 44 24 10 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 a2 e3 f1 11 48 3b 44 24 50 75 33 fb 48 83 c4 58 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 bf 2c 45 0a cc 48 8d 3d 67 4e da RSP: 0018:ffffc9000141faa0 EFLAGS: 00000296 RAX: 32f582729c8e9900 RBX: 0000000000000001 RCX: 0000000000000046 RDX: 000000004abe915d RSI: ffffffff8e69ca38 RDI: ffffffff8c6da580 RBP: ffff888112a39e00 R08: ffffffff818f9aba R09: 0000000000000000 R10: dffffc0000000000 R11: fffffbfff20f4830 R12: ffffc9000141fc40 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000246 process_scheduled_works+0xc03/0x1630 worker_thread+0xa47/0xfb0 kthread+0x38b/0x480 ret_from_fork+0x514/0xb70 ret_from_fork_asm+0x1a/0x30 *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: syzbot@syzkaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@googlegroups.com. To test a fix for this bug, please reply with `#syz test` (on a separate line) and attach the patch to the email. Notes: - The patch will be applied on top of the tested series (as an incremental fix). - To test a new version of the whole series, please send it directly to syzbot@lists.linux.dev. - Arguments like custom git repos and branches are not supported.