From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oa2-f9.google.com (mail-oa2-f9.google.com [74.125.231.73]) (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 CAB153DDDBE for ; Tue, 15 Sep 2026 15:10:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.231.73 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789485029; cv=none; b=AsMOSn/chfa4C8H9vQqI8rHv20Ay50JJq9p4/JKM535+Ljp4C18+sIGuEewVbWKLXcJKZeRYGqP78iwjDeoowlZDOPo7XTDNCBvbd5B6U8ItQZizug0filyDZMxCs6MQlferyrCb9FOkt1n6KibCdXWfuCakLd9F6a7FWlaBF/s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789485029; c=relaxed/simple; bh=0aTTYo9AKNOwLZZPnxtNfMcg3pXYDD2KHdOQfimOf+M=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=knwIp2LVHYtPbDOwYgcPIJqUgJAWIdNjZ4HO/1zf9d0THAOmO2/loWqsDvEteGpBPm4aMJ3OzaBXGMcbLvGiiG9ENxTaTyW3QtQILIuvx+6eV4ISMDVPZXrMAb4ysSNDF9G13K0DcnBHahbIw99cxa5bi6xW6oQAqBGQWXwv0ec= 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=74.125.231.73 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-oa2-f9.google.com with SMTP id 586e51a60fabf-4840f0c24bbso59342fac.1 for ; Tue, 15 Sep 2026 08:10:26 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1789485025; x=1790089825; h=content-transfer-encoding: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=05eRWcQkmVyuTeeo7bWsa4qmhk3vLgVesCvvW4mcNyc=; b=CYEsTmY7ywKC8Yxalt1t7qFVk3zBEGUwY1uAj2OVYfOdyAi5GH+NwpE41kqqTg2ab5 741HlPlw/P/i4wIPSkBKjg1Qp3nbFuXc+GRdy78Lt8GI3V9EnVfDGHJEhwHwLmUwI72/ qPwmdIuMbJFHhdEaapK7JVcDos1DGSzATT1mTGmQb6N7ToPLd3wxEdj1D7DaqrRoMVsB VsQGKEE7kihd5JC7W4JH1tU6emCJK/ilDSIdFRbtOwPS4ENyzZ1zaRezyKzzOJSicPs3 aWTsc4XmMmvWX1af+rtIikFHO6OserejWaOgtF/aB9cav+RdWp88wOarZjJtYR3rrChL in1w== X-Forwarded-Encrypted: i=1; AKwUvBxdzvGfPDBrRTJdo7plarltzABMAzGXoT2JhtKJ3sHGfbtle4FuWx1xd7M/OUpkEfNClDUhNH4yA2x0nK0=@vger.kernel.org X-Gm-Message-State: AFuF++mnyYe/rdw6Spwq2uf5hFKcxFwMWwpDY8QoVuZAy0IfcOzkE9qu ji+Zi4T/b6FPKOZYZkW5+3qyhHNYhsXBoVlN3SVTGnvwBOnq924vejtizcVY1aBBKMHH9m8mJ/I pMpJZMqfu0OR9+pZK7RngdjxyTj/uvadm6z4grucBiHDvDcBo1XCeXsrTw+A= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:625:b0:6be:354a:1ced with SMTP id 006d021491bc7-6c54292a60emr5300757eaf.64.1789485025298; Tue, 15 Sep 2026 08:10:25 -0700 (PDT) Date: Tue, 15 Sep 2026 08:10:25 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6aa95fe1.a211d2ce.1a5198.02af.GAE@google.com> Subject: [syzbot] [netfilter?] BUG: workqueue lockup in batadv_tt_purge From: syzbot To: davem@davemloft.net, edumazet@google.com, fw@strlen.de, herbert@gondor.apana.org.au, horms@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, netfilter-devel@vger.kernel.org, pabeni@redhat.com, pablo@netfilter.org, steffen.klassert@secunet.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hello, syzbot found the following issue on: HEAD commit: 5445d6419962 arm64: Don't read GMID_EL1 when MTE is disable= d git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.g= it for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=3D1514428e580000 kernel config: https://syzkaller.appspot.com/x/.config?x=3D56ed23170c168d4= c dashboard link: https://syzkaller.appspot.com/bug?extid=3D61b202fdc410840f0= 198 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-= 1~exp1~20260613092250.77), Debian LLD 22.1.8 userspace arch: arm64 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/e8b70e3bd109/disk-= 5445d641.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/e5227e56ac93/vmlinux-= 5445d641.xz kernel image: https://storage.googleapis.com/syzbot-assets/54905f78be59/Ima= ge-5445d641.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit= : Reported-by: syzbot+61b202fdc410840f0198@syzkaller.appspotmail.com BUG: workqueue lockup - pool cpus=3D1 node=3D0 flags=3D0x0 nice=3D0 stuck f= or 37s! Showing busy workqueues and worker pools: workqueue events: flags=3D0x100 pwq 2: cpus=3D0 node=3D0 flags=3D0x0 nice=3D0 active=3D8 refcnt=3D9 in-flight: 6264:reg_todo for 27s pending: 6*nsim_dev_hwstats_traffic_work, psi_avgs_work pwq 6: cpus=3D1 node=3D0 flags=3D0x0 nice=3D0 active=3D11 refcnt=3D12 pending: 4*nsim_dev_hwstats_traffic_work, 2*psi_avgs_work, 2*ovs_dp_mas= ks_rebalance, free_obj_work, 2*psi_avgs_work workqueue events_unbound: flags=3D0x2 pwq 8: cpus=3D0-1 flags=3D0x6 nice=3D0 active=3D20 refcnt=3D21 in-flight: 56:cfg80211_wiphy_work for 64s cfg80211_wiphy_work ,4950:cfg= 80211_wiphy_work for 68s cfg80211_wiphy_work ,7165:nsim_dev_trap_report_wor= k for 9s ,12:cfg80211_wiphy_work for 69s cfg80211_wiphy_work ,1457:cfg80211= _wiphy_work for 63s cfg80211_wiphy_work pending: nsim_dev_trap_report_work, toggle_allocation_gate, 5*nsim_dev_= trap_report_work, flush_memcg_stats_dwork, 3*nsim_dev_trap_report_work pwq 8: cpus=3D0-1 flags=3D0x6 nice=3D0 active=3D8 refcnt=3D9 in-flight: 52:cfg80211_wiphy_work for 67s cfg80211_wiphy_work ,13:cfg80= 211_wiphy_work for 67s cfg80211_wiphy_work ,40:cfg80211_wiphy_work for 62s = cfg80211_wiphy_work ,264:cfg80211_wiphy_work for 34s cfg80211_wiphy_work workqueue events_power_efficient: flags=3D0x82 pwq 8: cpus=3D0-1 flags=3D0x6 nice=3D0 active=3D8 refcnt=3D9 in-flight: 1188:neigh_periodic_work for 41s ,7164:gc_worker for 2s pending: crda_timeout_work, neigh_periodic_work, wg_ratelimiter_gc_entr= ies, reg_check_chans_work, 2*neigh_managed_work workqueue events_dfl_long: flags=3D0x2 pwq 8: cpus=3D0-1 flags=3D0x6 nice=3D0 active=3D6 refcnt=3D7 pending: 6*defense_work_handler workqueue mm_percpu_wq: flags=3D0x108 pwq 6: cpus=3D1 node=3D0 flags=3D0x0 nice=3D0 active=3D1 refcnt=3D2 pending: vmstat_update workqueue bat_events: flags=3D0x6000a pwq 8: cpus=3D0-1 flags=3D0x6 nice=3D0 active=3D1 refcnt=3D45 MAYDAY in-flight: 2852(RESCUER):batadv_tt_purge for 11s pending: mayday_cursor_func inactive: 2*batadv_tt_purge, batadv_dat_purge, 2*batadv_bla_periodic_wo= rk, batadv_dat_purge, batadv_bla_periodic_work, batadv_dat_purge, batadv_bl= a_periodic_work, batadv_dat_purge, 4*batadv_mcast_mla_update, 2*batadv_iv_s= end_outstanding_bat_ogm_packet, 2*batadv_purge_orig, 6*batadv_iv_send_outst= anding_bat_ogm_packet, 2*batadv_purge_orig, batadv_dat_purge, batadv_bla_pe= riodic_work, 4*batadv_iv_send_outstanding_bat_ogm_packet, batadv_purge_orig= , batadv_tt_purge, batadv_mcast_mla_update, 3*batadv_iv_send_outstanding_ba= t_ogm_packet, batadv_tt_purge workqueue wg-kex-wg0: flags=3D0x6 pwq 8: cpus=3D0-1 flags=3D0x6 nice=3D0 active=3D1 refcnt=3D2 pending: wg_packet_handshake_send_worker workqueue wg-crypt-wg0: flags=3D0x128 pwq 6: cpus=3D1 node=3D0 flags=3D0x0 nice=3D0 active=3D2 refcnt=3D3 pending: wg_packet_encrypt_worker, wg_packet_tx_worker workqueue wg-kex-wg1: flags=3D0x6 pwq 8: cpus=3D0-1 flags=3D0x6 nice=3D0 active=3D1 refcnt=3D2 pending: wg_packet_handshake_send_worker workqueue wg-crypt-wg1: flags=3D0x128 pwq 6: cpus=3D1 node=3D0 flags=3D0x0 nice=3D0 active=3D3 refcnt=3D4 pending: wg_packet_encrypt_worker, wg_packet_tx_worker, wg_packet_decry= pt_worker workqueue wg-kex-wg2: flags=3D0x6 pwq 8: cpus=3D0-1 flags=3D0x6 nice=3D0 active=3D1 refcnt=3D2 pending: wg_packet_handshake_send_worker workqueue wg-crypt-wg2: flags=3D0x128 pwq 6: cpus=3D1 node=3D0 flags=3D0x0 nice=3D0 active=3D3 refcnt=3D4 pending: wg_packet_encrypt_worker, wg_packet_decrypt_worker, wg_packet_= tx_worker workqueue wg-crypt-wg0: flags=3D0x128 pwq 6: cpus=3D1 node=3D0 flags=3D0x0 nice=3D0 active=3D2 refcnt=3D3 pending: wg_packet_encrypt_worker, wg_packet_tx_worker workqueue wg-kex-wg1: flags=3D0x6 pwq 8: cpus=3D0-1 flags=3D0x6 nice=3D0 active=3D1 refcnt=3D2 pending: wg_packet_handshake_send_worker workqueue wg-crypt-wg1: flags=3D0x128 pwq 6: cpus=3D1 node=3D0 flags=3D0x0 nice=3D0 active=3D3 refcnt=3D4 pending: wg_packet_encrypt_worker, wg_packet_tx_worker, wg_packet_decry= pt_worker workqueue wg-crypt-wg2: flags=3D0x128 pwq 6: cpus=3D1 node=3D0 flags=3D0x0 nice=3D0 active=3D3 refcnt=3D4 pending: wg_packet_encrypt_worker, wg_packet_decrypt_worker, wg_packet_= tx_worker workqueue wg-kex-wg0: flags=3D0x6 pwq 8: cpus=3D0-1 flags=3D0x6 nice=3D0 active=3D1 refcnt=3D2 pending: wg_packet_handshake_send_worker workqueue wg-crypt-wg0: flags=3D0x128 pwq 6: cpus=3D1 node=3D0 flags=3D0x0 nice=3D0 active=3D2 refcnt=3D3 pending: wg_packet_encrypt_worker, wg_packet_tx_worker workqueue wg-crypt-wg1: flags=3D0x128 pwq 6: cpus=3D1 node=3D0 flags=3D0x0 nice=3D0 active=3D3 refcnt=3D4 pending: wg_packet_encrypt_worker, wg_packet_tx_worker, wg_packet_decry= pt_worker workqueue wg-kex-wg2: flags=3D0x6 pwq 8: cpus=3D0-1 flags=3D0x6 nice=3D0 active=3D1 refcnt=3D2 pending: wg_packet_handshake_send_worker workqueue wg-crypt-wg2: flags=3D0x128 pwq 6: cpus=3D1 node=3D0 flags=3D0x0 nice=3D0 active=3D2 refcnt=3D3 pending: wg_packet_encrypt_worker, wg_packet_tx_worker workqueue wg-kex-wg0: flags=3D0x6 pwq 8: cpus=3D0-1 flags=3D0x6 nice=3D0 active=3D1 refcnt=3D2 pending: wg_packet_handshake_send_worker workqueue wg-crypt-wg0: flags=3D0x128 pwq 6: cpus=3D1 node=3D0 flags=3D0x0 nice=3D0 active=3D2 refcnt=3D3 pending: wg_packet_encrypt_worker, wg_packet_tx_worker workqueue wg-kex-wg1: flags=3D0x6 pwq 8: cpus=3D0-1 flags=3D0x6 nice=3D0 active=3D1 refcnt=3D2 pending: wg_packet_handshake_send_worker workqueue wg-crypt-wg1: flags=3D0x128 pwq 6: cpus=3D1 node=3D0 flags=3D0x0 nice=3D0 active=3D2 refcnt=3D3 pending: wg_packet_encrypt_worker, wg_packet_tx_worker workqueue wg-crypt-wg2: flags=3D0x128 pwq 6: cpus=3D1 node=3D0 flags=3D0x0 nice=3D0 active=3D2 refcnt=3D3 pending: wg_packet_encrypt_worker, wg_packet_tx_worker pool 2: cpus=3D0 node=3D0 flags=3D0x0 nice=3D0 hung=3D0s workers=3D10 idle:= 4833 9 4790 6306 5581 4834 6772 10 1009 pool 8: cpus=3D0-1 flags=3D0x6 nice=3D0 hung=3D2s workers=3D12 manager: 716= 6 Showing backtraces of busy workers in stalled worker pools: pool 6: no worker in running state, cpu=3D1 is busy (nr_workers=3D11 nr_idl= e=3D11) The pool might have trouble waking an idle worker. Backtrace of last woken worker: task:kworker/1:1 state:R running task stack:0 pid:26 tgid:2= 6 ppid:2 task_flags:0x4208060 flags:0x00000010 Workqueue: 0x0 (wg-crypt-wg0) Call trace: __switch_to+0x2b4/0x6e4 arch/arm64/kernel/process.c:775 (T) context_switch kernel/sched/core.c:5520 [inline] __schedule+0x1370/0x2d80 kernel/sched/core.c:7270 __schedule_loop kernel/sched/core.c:7347 [inline] schedule+0x13c/0x20c kernel/sched/core.c:7362 worker_thread+0x924/0xbd0 kernel/workqueue.c:3566 kthread+0x304/0x3d4 kernel/kthread.c:436 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:838 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 2852 Comm: kworker/R-bat_e Not tainted syzkaller #0 PREE= MPT=20 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Goo= gle 08/14/2026 Workqueue: bat_events batadv_tt_purge pstate: 03400005 (nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=3D--) pc : in_softirq_really kernel/kcov.c:167 [inline] pc : check_kcov_mode+0x18/0x54 kernel/kcov.c:179 lr : write_comp_data+0x38/0x84 kernel/kcov.c:242 sp : ffff80008ec46dd0 x29: ffff80008ec46dd0 x28: dfff800000000000 x27: 000000000000224e x26: dfff800000000000 x25: ffff700011d88dc8 x24: 1ffff00011d88dfa x23: ffff0000c8e9d880 x22: 0000000000000007 x21: 0000000000000002 x20: ffff000023a0f400 x19: ffff800085709eb4 x18: 0000000011264820 x17: 0000000001320140 x16: 0140000800000000 x15: 0000000000000000 x14: 00000000850ade10 x13: 0000000000000007 x12: 0000000000000000 x11: 0000000000000000 x10: 000000000000000f x9 : 0000000000000101 x8 : ffff0000c8e9d880 x7 : 0000000000000000 x6 : 000000000000003f x5 : 0000000000000040 x4 : 0000000000000000 x3 : ffff800085709eb4 x2 : ffff000023a0f400 x1 : ffff0000c8e9d880 x0 : 0000000000000003 Call trace: preempt_count arch/arm64/include/asm/preempt.h:12 [inline] (P) in_softirq_really kernel/kcov.c:167 [inline] (P) check_kcov_mode+0x18/0x54 kernel/kcov.c:179 (P) __sanitizer_cov_trace_const_cmp8+0x24/0x30 kernel/kcov.c:317 __xfrm_decode_session+0x484/0x8a8 net/xfrm/xfrm_policy.c:3524 xfrm_decode_session include/net/xfrm.h:1357 [inline] ip_route_me_harder+0x7c4/0xd80 net/ipv4/netfilter.c:67 synproxy_send_tcp+0x2d4/0x5a4 net/netfilter/nf_synproxy_core.c:434 synproxy_send_client_synack+0x3b0/0x640 net/netfilter/nf_synproxy_core.c:4= 87 nft_synproxy_eval_v4+0x16c/0x278 net/netfilter/nft_synproxy.c:59 nft_synproxy_do_eval+0x2d8/0x4a4 net/netfilter/nft_synproxy.c:141 nft_synproxy_eval+0x34/0x48 net/netfilter/nft_synproxy.c:247 expr_call_ops_eval net/netfilter/nf_tables_core.c:237 [inline] nft_do_chain+0x418/0x13c8 net/netfilter/nf_tables_core.c:285 nft_do_chain_inet+0x284/0x3d4 net/netfilter/nft_chain_filter.c:162 nf_hook_entry_hookfn include/linux/netfilter.h:165 [inline] nf_hook_slow+0xc8/0x224 net/netfilter/core.c:619 nf_hook include/linux/netfilter.h:280 [inline] NF_HOOK+0x1f0/0x398 include/linux/netfilter.h:323 ip_local_deliver+0x128/0x188 net/ipv4/ip_input.c:262 dst_input include/net/dst.h:480 [inline] ip_rcv_finish+0x20c/0x230 net/ipv4/ip_input.c:492 NF_HOOK+0x308/0x398 include/linux/netfilter.h:325 ip_rcv+0x7c/0x9c net/ipv4/ip_input.c:612 __netif_receive_skb_one_core+0xc8/0x110 net/core/dev.c:6264 __netif_receive_skb+0x34/0x128 net/core/dev.c:6377 process_backlog+0x5f4/0x16f8 net/core/dev.c:6728 __napi_poll+0xb4/0x328 net/core/dev.c:7787 napi_poll net/core/dev.c:7850 [inline] net_rx_action+0x5b0/0xc14 net/core/dev.c:8007 handle_softirqs+0x2ec/0xd98 kernel/softirq.c:645 __do_softirq+0x14/0x20 kernel/softirq.c:679 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:78 call_on_irq_stack+0x30/0x48 arch/arm64/kernel/entry.S:885 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:83 do_softirq+0x90/0xf8 kernel/softirq.c:546 __local_bh_enable_ip+0x240/0x35c kernel/softirq.c:473 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:237 [inline] _raw_spin_unlock_bh+0x3c/0x4c kernel/locking/spinlock.c:245 spin_unlock_bh include/linux/spinlock.h:407 [inline] batadv_tt_global_purge net/batman-adv/translation-table.c:2390 [inline] batadv_tt_purge+0x3e4/0x7b4 net/batman-adv/translation-table.c:3754 process_one_work kernel/workqueue.c:3387 [inline] process_scheduled_works+0x91c/0x1250 kernel/workqueue.c:3470 rescuer_thread+0x68c/0xd90 kernel/workqueue.c:3694 kthread+0x304/0x3d4 kernel/kthread.c:436 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:838 --- 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