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Sun, 08 Nov 2026 00:01:02 -0800 (PST) Date: Sun, 08 Nov 2026 00:01:02 -0800 In-Reply-To: <2056587.PYKUYFuaPT@sven-l14> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6af02c3e.4dd4714a.f8d02.000e.GAE@google.com> Subject: Re: [syzbot] [arm?] BUG: workqueue lockup in batadv_tt_purge From: syzbot To: antonio@mandelbit.com, b.a.t.m.a.n@lists.open-mesh.org, davem@davemloft.net, linux-kernel@vger.kernel.org, marek.lindner@mailbox.org, netdev@vger.kernel.org, omermetekaya0@gmail.com, sven@narfation.org, sw@simonwunderlich.de, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-MailFrom: 3PizwagkbALUntufVggZmVkkdY.bjjbgZpnZmXjioZio.Xjh@M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com X-Mailman-Rule-Hits: nonmember-moderation X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; loop; banned-address; header-match-b.a.t.m.a.n.lists.open-mesh.org-0; header-match-b.a.t.m.a.n.lists.open-mesh.org-1; header-match-b.a.t.m.a.n.lists.open-mesh.org-2; header-match-b.a.t.m.a.n.lists.open-mesh.org-3; emergency; member-moderation Message-ID-Hash: FRQ27M4EBDJSK65FEYOSXG2N7POQUUXV X-Message-ID-Hash: FRQ27M4EBDJSK65FEYOSXG2N7POQUUXV X-Mailman-Approved-At: Sun, 08 Nov 2026 09:05:56 +0100 X-Mailman-Version: 3.3.10 Precedence: list List-Id: The list for a Better Approach To Mobile Ad-hoc Networking Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: X-Spam-Status: No, score=-8.7 required=3.0 tests=BAYES_00,FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_NONE autolearn=ham autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 Hello, syzbot has tested the proposed patch but the reproducer is still triggering= an issue: BUG: workqueue lockup in nsim_fib_event_work bridge0: received packet on bridge_slave_1 with own address as source addre= ss (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source addr= ess (addr:aa:aa:aa:aa:aa:0c, vlan:0) BUG: workqueue lockup - pool cpus=3D1 node=3D0 flags=3D0x0 nice=3D0 stuck f= or 34s! Showing busy workqueues and worker pools: workqueue events: flags=3D0x100 pwq 2: cpus=3D0 node=3D0 flags=3D0x0 nice=3D0 active=3D4 refcnt=3D5 pending: nsim_dev_hwstats_traffic_work, vmstat_shepherd, 2*ovs_dp_masks= _rebalance pwq 6: cpus=3D1 node=3D0 flags=3D0x0 nice=3D0 active=3D33 refcnt=3D34 in-flight: 26:nsim_fib_event_work for 35s nsim_fib_event_work ,4951:nsi= m_fib_event_work for 31s ,1503:nsim_fib_event_work for 22s ,1091:nsim_fib_e= vent_work for 15s pending: 3*nsim_dev_hwstats_traffic_work, 2*ovs_dp_masks_rebalance, psi= _avgs_work, 3*ovs_dp_masks_rebalance, psi_avgs_work, drm_fb_helper_damage_w= ork, 2*l2cap_info_timeout, psi_avgs_work, 2*l2cap_info_timeout, 4*ovs_dp_ma= sks_rebalance, 3*rht_deferred_worker, psi_avgs_work, reg_todo, 3*nsim_fib_e= vent_work workqueue events_unbound: flags=3D0x2 pwq 8: cpus=3D0-1 flags=3D0x6 nice=3D0 active=3D5 refcnt=3D6 in-flight: 14:nsim_dev_trap_report_work for 5s pending: 2*nsim_dev_trap_report_work, toggle_allocation_gate, flush_mem= cg_stats_dwork pwq 8: cpus=3D0-1 flags=3D0x6 nice=3D0 active=3D15 refcnt=3D16 in-flight: 5376:cfg80211_wiphy_work for 25s cfg80211_wiphy_work ,1178:c= fg80211_wiphy_work for 32s cfg80211_wiphy_work ,1372:cfg80211_wiphy_work fo= r 35s cfg80211_wiphy_work ,5377:nsim_dev_trap_report_work for 7s ,58:cfg802= 11_wiphy_work for 33s cfg80211_wiphy_work ,49:cfg80211_wiphy_work for 23s c= fg80211_wiphy_work ,40:cfg80211_wiphy_work for 31s cfg80211_wiphy_work pending: 2*macvlan_process_broadcast workqueue events_power_efficient: flags=3D0x82 pwq 8: cpus=3D0-1 flags=3D0x6 nice=3D0 active=3D4 refcnt=3D5 pending: fb_flashcursor, wg_ratelimiter_gc_entries, 2*neigh_managed_wor= k pwq 8: cpus=3D0-1 flags=3D0x6 nice=3D0 active=3D3 refcnt=3D4 in-flight: 1350:gc_worker for 16s ,144:neigh_periodic_work for 20s pending: do_cache_clean workqueue events_dfl_long: flags=3D0x2 pwq 8: cpus=3D0-1 flags=3D0x6 nice=3D0 active=3D11 refcnt=3D12 pending: 11*defense_work_handler workqueue netns: flags=3D0x6000a pwq 8: cpus=3D0-1 flags=3D0x6 nice=3D0 active=3D1 refcnt=3D4 in-flight: 12:cleanup_net for 36s workqueue mm_percpu_wq: flags=3D0x108 pwq 2: cpus=3D0 node=3D0 flags=3D0x0 nice=3D0 active=3D1 refcnt=3D2 pending: vmstat_update pwq 6: cpus=3D1 node=3D0 flags=3D0x0 nice=3D0 active=3D1 refcnt=3D2 pending: vmstat_update workqueue writeback: flags=3D0x4a pwq 8: cpus=3D0-1 flags=3D0x6 nice=3D0 active=3D1 refcnt=3D4 MAYDAY in-flight: 33(RESCUER):wb_workfn for 31s workqueue mld: flags=3D0x40108 pwq 2: cpus=3D0 node=3D0 flags=3D0x0 nice=3D0 active=3D1 refcnt=3D4 pending: mld_dad_work inactive: 2*mld_dad_work pwq 6: cpus=3D1 node=3D0 flags=3D0x0 nice=3D0 active=3D1 refcnt=3D108 pending: mld_dad_work inactive: mld_dad_work, 8*mld_ifc_work, 4*mld_dad_work, mld_ifc_work, m= ld_dad_work, 10*mld_ifc_work, mld_dad_work, 3*mld_ifc_work, mld_dad_work, 1= 1*mld_ifc_work, mld_dad_work, mld_ifc_work, mld_dad_work, mld_ifc_work, 3*m= ld_dad_work, 10*mld_ifc_work, 3*mld_dad_work, 7*mld_ifc_work, 2*mld_dad_wor= k, 3*mld_ifc_work, mld_dad_work, mld_ifc_work, mld_dad_work, mld_ifc_work, = mld_dad_work, mld_ifc_work, mld_dad_work, 17*mld_ifc_work, mld_dad_work, 3*= mld_ifc_work, 5*mld_dad_work workqueue ipv6_addrconf: flags=3D0x6000a pwq 8: cpus=3D0-1 flags=3D0x6 nice=3D0 active=3D1 refcnt=3D248 MAYDAY in-flight: 2822(RESCUER):addrconf_dad_work for 0s pending: mayday_cursor_func inactive: 242*addrconf_dad_work workqueue bat_events: flags=3D0x6000a pwq 8: cpus=3D0-1 flags=3D0x6 nice=3D0 active=3D1 refcnt=3D50 MAYDAY in-flight: 2854(RESCUER):batadv_dat_purge for 7s inactive: batadv_bla_periodic_work, batadv_dat_purge, batadv_bla_period= ic_work, batadv_dat_purge, batadv_bla_periodic_work, batadv_dat_purge, bata= dv_bla_periodic_work, batadv_dat_purge, batadv_bla_periodic_work, batadv_iv= _send_outstanding_bat_ogm_packet, batadv_mcast_mla_update, 4*batadv_iv_send= _outstanding_bat_ogm_packet, batadv_purge_orig, 2*batadv_iv_send_outstandin= g_bat_ogm_packet, 4*batadv_purge_orig, 4*batadv_iv_send_outstanding_bat_ogm= _packet, 2*batadv_tt_purge, 4*batadv_iv_send_outstanding_bat_ogm_packet, 3*= batadv_tt_purge, batadv_mcast_mla_update, batadv_purge_orig, batadv_iv_send= _outstanding_bat_ogm_packet, batadv_tt_purge, 4*batadv_mcast_mla_update, ba= tadv_dat_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 2: cpus=3D0 node=3D0 flags=3D0x0 nice=3D0 active=3D1 refcnt=3D2 pending: wg_packet_encrypt_worker 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_decrypt_worker, wg_packet_encrypt_worker, wg_packet_= tx_worker workqueue wg-kex-wg2: flags=3D0x124 pwq 2: cpus=3D0 node=3D0 flags=3D0x0 nice=3D0 active=3D2 refcnt=3D3 in-flight: 4767:wg_packet_handshake_receive_worker for 21s pending: wg_packet_handshake_receive_worker pwq 6: cpus=3D1 node=3D0 flags=3D0x0 nice=3D0 active=3D1 refcnt=3D2 pending: wg_packet_handshake_receive_worker workqueue wg-crypt-wg2: flags=3D0x128 pwq 2: cpus=3D0 node=3D0 flags=3D0x0 nice=3D0 active=3D1 refcnt=3D2 pending: wg_packet_encrypt_worker pwq 6: cpus=3D1 node=3D0 flags=3D0x0 nice=3D0 active=3D3 refcnt=3D4 pending: wg_packet_decrypt_worker, 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 2: cpus=3D0 node=3D0 flags=3D0x0 nice=3D0 active=3D1 refcnt=3D2 pending: wg_packet_encrypt_worker pwq 6: cpus=3D1 node=3D0 flags=3D0x0 nice=3D0 active=3D2 refcnt=3D3 pending: wg_packet_tx_worker, wg_packet_encrypt_worker workqueue wg-crypt-wg1: flags=3D0x128 pwq 2: cpus=3D0 node=3D0 flags=3D0x0 nice=3D0 active=3D2 refcnt=3D3 in-flight: 932:wg_packet_decrypt_worker for 22s pending: wg_packet_encrypt_worker 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-wg2: flags=3D0x124 pwq 2: cpus=3D0 node=3D0 flags=3D0x0 nice=3D0 active=3D1 refcnt=3D2 pending: wg_packet_handshake_receive_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 2: cpus=3D0 node=3D0 flags=3D0x0 nice=3D0 active=3D1 refcnt=3D2 pending: wg_packet_encrypt_worker pwq 6: cpus=3D1 node=3D0 flags=3D0x0 nice=3D0 active=3D2 refcnt=3D3 pending: wg_packet_encrypt_worker, wg_packet_decrypt_worker workqueue wg-crypt-wg0: flags=3D0x128 pwq 2: cpus=3D0 node=3D0 flags=3D0x0 nice=3D0 active=3D3 refcnt=3D4 in-flight: 4813:wg_packet_encrypt_worker for 14s pending: wg_packet_tx_worker, wg_packet_encrypt_worker pwq 6: cpus=3D1 node=3D0 flags=3D0x0 nice=3D0 active=3D2 refcnt=3D3 pending: wg_packet_tx_worker, wg_packet_encrypt_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 2: cpus=3D0 node=3D0 flags=3D0x0 nice=3D0 active=3D1 refcnt=3D2 pending: wg_packet_encrypt_worker pwq 6: cpus=3D1 node=3D0 flags=3D0x0 nice=3D0 active=3D2 refcnt=3D3 pending: wg_packet_tx_worker, wg_packet_encrypt_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 2: cpus=3D0 node=3D0 flags=3D0x0 nice=3D0 active=3D2 refcnt=3D3 pending: wg_packet_decrypt_worker, wg_packet_encrypt_worker 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-wg2: flags=3D0x124 pwq 6: cpus=3D1 node=3D0 flags=3D0x0 nice=3D0 active=3D1 refcnt=3D2 pending: wg_packet_handshake_receive_worker workqueue wg-crypt-wg2: flags=3D0x128 pwq 2: cpus=3D0 node=3D0 flags=3D0x0 nice=3D0 active=3D1 refcnt=3D2 pending: wg_packet_encrypt_worker 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-wg1: flags=3D0x128 pwq 2: cpus=3D0 node=3D0 flags=3D0x0 nice=3D0 active=3D1 refcnt=3D2 pending: wg_packet_encrypt_worker 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-wg2: flags=3D0x124 pwq 2: cpus=3D0 node=3D0 flags=3D0x0 nice=3D0 active=3D1 refcnt=3D2 pending: wg_packet_handshake_receive_worker workqueue wg-crypt-wg2: flags=3D0x128 pwq 2: cpus=3D0 node=3D0 flags=3D0x0 nice=3D0 active=3D1 refcnt=3D2 pending: wg_packet_encrypt_worker pwq 6: cpus=3D1 node=3D0 flags=3D0x0 nice=3D0 active=3D2 refcnt=3D3 pending: wg_packet_decrypt_worker, wg_packet_encrypt_worker pool 2: cpus=3D0 node=3D0 flags=3D0x0 nice=3D0 hung=3D14s workers=3D6 idle:= 4847 9 10 pool 6: cpus=3D1 node=3D0 flags=3D0x0 nice=3D0 hung=3D34s workers=3D9 idle:= 24 4738 5269 5303 4950 pool 8: cpus=3D0-1 flags=3D0x6 nice=3D0 hung=3D0s workers=3D12 manager: 537= 8 Showing backtraces of busy workers in stalled worker pools: pool 6: task:kworker/1:1 state:R running task stack:0 pid:26 tgid:2= 6 ppid:2 task_flags:0x4208060 flags:0x00000010 Workqueue: events nsim_fib_event_work Call trace: Tested on: commit: 532df11b batman-adv: tt: batch BH re-enable during TT .. git tree: https://git.open-mesh.org/batadv.git disable-bh console output: https://syzkaller.appspot.com/x/log.txt?x=3D137967a5580000 kernel config: https://syzkaller.appspot.com/x/.config?x=3Da3c0ea8c3fd7635= 3 dashboard link: https://syzkaller.appspot.com/bug?extid=3D61b202fdc410840f0= 198 compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 userspace arch: arm64 Note: no patches were applied.