From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f79.google.com (mail-ot1-f79.google.com [209.85.210.79]) (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 080C245DF49 for ; Wed, 23 Sep 2026 07:59:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.79 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790150373; cv=none; b=uBwcMl6ElGCc6TkNbkGa8G63I3sc+6QN9/sntKkolgYqR4PNi3SDlIgTUMFh3DTuwXjtbCRjqq7TtZucGIXS8xxErqSRLfWEvvtEAMg4FeROaeggOi6qid4WwsvkJ7dwIjfcS1BAmibvYKLp7lLrpRLwmLBHUaUvcV/zEUyQUNM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790150373; c=relaxed/simple; bh=4eh5zOTZC44LleOfaH6juKYJ6+gtEihpaa8gIsJ1ApI=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=iTtiA/Zy9K7MR5+/72TlOWcguoPvU6vQqNtyi5djyaVIHttK0AtAOYkD5tuozCCHyzlT2byCXHMTvqAf7sxq3E918ZnbFZ9JKu0OCj0dcMwvEwatzwsPGEykMIBPszrT2bIxcWO1MKYmJaUAeiwrkm9ILZMur7/QtYaaU/ImDK0= 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=209.85.210.79 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-ot1-f79.google.com with SMTP id 46e09a7af769-80491594629so2328543a34.1 for ; Wed, 23 Sep 2026 00:59:30 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1790150370; x=1790755170; 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=7F/Xvf4hTHldLYktQ2+9U+srrjIDEAG1Qfa+m0cEIKw=; b=p3lO63jVgcgDKnexnI1dQiOuV3LivAQ4V8+Bs4CV/+M/w4qpDj6A8lXdpelpHqZEv+ W61kVnL8j1Wz0vU7n7gLdj5T+dOKoKOKCk1FfrdQ6E7qayN3Z/Qa/n6JC88onvfZsG84 6nmxLanTYhbAGwCvoGE7rGptt9Wa1OTFjaEcAevg1O0fSLmlD3ikK/crPJwEqwbJE3ug d+1sz/YKm40JltP8d1hTLcdJrtS8YDud4SOONOa3Z/LRMs5nTyK+ukthnzZW6fF4Pf2G MNSyHWp5cqLddgAbHqowwvRrLrLmpcU2Lhe69rwVuTsRUhgJhqmhqEVkSn8H+awYSM18 DxvA== X-Forwarded-Encrypted: i=1; AKwUvBx7Gxl4H31NcrN18r2ccYLrNRqzFvgU173ERNxa30KN30s85rtbntJJIksyDUb/Z4frFGRWhQX2AKPAhG4=@vger.kernel.org X-Gm-Message-State: AFuF++mXu+nJl0SOmmZrmSuS4TSDY/605od3N8fIHdFSpL6t3Q2UVJI8 uEQrdGvZifRdSegMBXlnhLXS5neA9/uMqyoDqoxkUaT8mdw1+pyfisHCS9dGoVCtpSMD92Ym4HF Kt1RyMCDW6ybpbCmL3C6iJWOP21jN1nsVQRi7Pr1loqYBLgiYGPO4i0gVIaE= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a4a:ee06:0:b0:6bf:ebd9:6cb4 with SMTP id 006d021491bc7-6d157d8a169mr4187355eaf.8.1790150369772; Wed, 23 Sep 2026 00:59:29 -0700 (PDT) Date: Wed, 23 Sep 2026 00:59:29 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6ab386e1.e8212013.2d060.0006.GAE@google.com> Subject: [syzbot] [wireless?] BUG: workqueue lockup in reg_todo From: syzbot To: davem@davemloft.net, edumazet@google.com, horms@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-wireless@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.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: 38872197cae2 Merge branch 'for-next/fixes' into for-kernelc= i 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=3D17105405580000 kernel config: https://syzkaller.appspot.com/x/.config?x=3D56ed23170c168d4= c dashboard link: https://syzkaller.appspot.com/bug?extid=3Db733a65a200ab7aa2= cbe 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/c5963fdd6790/disk-= 38872197.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a8c2cab00c45/vmlinux-= 38872197.xz kernel image: https://storage.googleapis.com/syzbot-assets/bde15d173380/Ima= ge-38872197.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit= : Reported-by: syzbot+b733a65a200ab7aa2cbe@syzkaller.appspotmail.com sched: DL replenish lagged too much BUG: workqueue lockup - pool cpus=3D0 node=3D0 flags=3D0x0 nice=3D0 stuck f= or 35s! Showing busy workqueues and worker pools: workqueue events: flags=3D0x100 pwq 2: cpus=3D0 node=3D0 flags=3D0x0 nice=3D0 active=3D18 refcnt=3D19 in-flight: 9:reg_todo for 39s pending: 2*psi_avgs_work, 6*nsim_dev_hwstats_traffic_work, free_obj_wor= k, 3*psi_avgs_work, delayed_vfree_work, vmstat_shepherd, 3*ovs_dp_masks_reb= alance pwq 6: cpus=3D1 node=3D0 flags=3D0x0 nice=3D0 active=3D9 refcnt=3D10 pending: 4*nsim_dev_hwstats_traffic_work, 4*ovs_dp_masks_rebalance, psi= _avgs_work workqueue events_unbound: flags=3D0x2 pwq 8: cpus=3D0-1 flags=3D0x4 nice=3D0 active=3D9 refcnt=3D10 in-flight: 237:cfg80211_wiphy_work for 62s cfg80211_wiphy_work ,14:nsim= _dev_trap_report_work for 14s ,6551:cfg80211_wiphy_work for 65s cfg80211_wi= phy_work ,6553:cfg80211_wiphy_work for 10s ,6550:nsim_dev_trap_report_work = for 7s pending: 2*nsim_dev_trap_report_work pwq 8: cpus=3D0-1 flags=3D0x4 nice=3D0 active=3D12 refcnt=3D13 in-flight: 6552:nsim_dev_trap_report_work for 9s ,40:cfg80211_wiphy_wor= k for 59s cfg80211_wiphy_work ,3416:cfg80211_wiphy_work for 59s cfg80211_wi= phy_work ,3118:cfg80211_wiphy_work for 2s ,6548:toggle_allocation_gate for = 8s ,524:cfg80211_wiphy_work for 17s ,6554:nsim_dev_trap_report_work for 4s pending: 3*nsim_dev_trap_report_work workqueue events_power_efficient: flags=3D0x82 pwq 8: cpus=3D0-1 flags=3D0x4 nice=3D0 active=3D4 refcnt=3D5 in-flight: 5258:reg_check_chans_work for 9s ,373:neigh_periodic_work fo= r 30s ,49:wg_ratelimiter_gc_entries for 1s pending: neigh_periodic_work pwq 8: cpus=3D0-1 flags=3D0x4 nice=3D0 active=3D2 refcnt=3D3 in-flight: 6555:gc_worker for 8s ,6549:hash_ipportnet6_gc for 4s workqueue events_dfl_long: flags=3D0x2 pwq 8: cpus=3D0-1 flags=3D0x4 nice=3D0 active=3D7 refcnt=3D8 pending: 7*defense_work_handler pwq 8: cpus=3D0-1 flags=3D0x4 nice=3D0 active=3D1 refcnt=3D2 in-flight: 5257:defense_work_handler for 8s workqueue netns: flags=3D0x6000a pwq 8: cpus=3D0-1 flags=3D0x4 nice=3D0 active=3D1 refcnt=3D5 in-flight: 5259:cleanup_net for 74s inactive: cleanup_net 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=3D0x4 nice=3D0 active=3D1 refcnt=3D2 in-flight: 289:wb_workfn for 64s workqueue ipv6_addrconf: flags=3D0x6000a pwq 8: cpus=3D0-1 flags=3D0x4 nice=3D0 active=3D1 refcnt=3D7 in-flight: 134:addrconf_dad_work for 39s inactive: 3*addrconf_dad_work workqueue bat_events: flags=3D0x6000a pwq 8: cpus=3D0-1 flags=3D0x4 nice=3D0 active=3D1 refcnt=3D51 in-flight: 6547:batadv_tt_purge for 11s inactive: 2*batadv_tt_purge, batadv_bla_periodic_work, batadv_dat_purge= , batadv_tt_purge, batadv_bla_periodic_work, batadv_dat_purge, batadv_bla_p= eriodic_work, batadv_dat_purge, batadv_mcast_mla_update, 2*batadv_tt_purge,= batadv_dat_purge, batadv_bla_periodic_work, batadv_dat_purge, batadv_bla_p= eriodic_work, batadv_mcast_mla_update, batadv_bla_periodic_work, batadv_dat= _purge, 4*batadv_mcast_mla_update, 5*batadv_iv_send_outstanding_bat_ogm_pac= ket, 3*batadv_purge_orig, batadv_iv_send_outstanding_bat_ogm_packet, 3*bata= dv_purge_orig, 12*batadv_iv_send_outstanding_bat_ogm_packet workqueue wg-crypt-wg0: flags=3D0x128 pwq 2: cpus=3D0 node=3D0 flags=3D0x0 nice=3D0 active=3D2 refcnt=3D3 pending: wg_packet_encrypt_worker, wg_packet_tx_worker pwq 6: cpus=3D1 node=3D0 flags=3D0x0 nice=3D0 active=3D1 refcnt=3D2 pending: wg_packet_encrypt_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 workqueue wg-kex-wg0: flags=3D0x6 pwq 8: cpus=3D0-1 flags=3D0x4 nice=3D0 active=3D1 refcnt=3D2 in-flight: 6546:wg_packet_handshake_send_worker for 0s workqueue wg-crypt-wg0: flags=3D0x128 pwq 2: cpus=3D0 node=3D0 flags=3D0x0 nice=3D0 active=3D2 refcnt=3D3 pending: wg_packet_tx_worker, wg_packet_encrypt_worker workqueue wg-crypt-wg2: flags=3D0x128 pwq 2: cpus=3D0 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 2: cpus=3D0 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 2: cpus=3D0 node=3D0 flags=3D0x0 nice=3D0 active=3D2 refcnt=3D3 pending: wg_packet_encrypt_worker, wg_packet_tx_worker workqueue wg-kex-wg0: 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-wg0: flags=3D0x128 pwq 2: cpus=3D0 node=3D0 flags=3D0x0 nice=3D0 active=3D3 refcnt=3D4 pending: wg_packet_tx_worker, wg_packet_encrypt_worker, wg_packet_decry= pt_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 workqueue wg-crypt-wg0: flags=3D0x128 pwq 2: cpus=3D0 node=3D0 flags=3D0x0 nice=3D0 active=3D3 refcnt=3D4 pending: wg_packet_encrypt_worker, wg_packet_tx_worker, wg_packet_decry= pt_worker pwq 6: cpus=3D1 node=3D0 flags=3D0x0 nice=3D0 active=3D1 refcnt=3D2 pending: wg_packet_encrypt_worker workqueue wg-kex-wg1: 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-wg1: flags=3D0x128 pwq 2: cpus=3D0 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=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=3D2 refcnt=3D3 pending: wg_packet_encrypt_worker, wg_packet_tx_worker workqueue wg-crypt-wg0: flags=3D0x128 pwq 2: cpus=3D0 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-wg1: flags=3D0x128 pwq 2: cpus=3D0 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-crypt-wg2: flags=3D0x128 pwq 2: cpus=3D0 node=3D0 flags=3D0x0 nice=3D0 active=3D2 refcnt=3D3 pending: wg_packet_tx_worker, wg_packet_encrypt_worker workqueue wg-crypt-wg0: flags=3D0x128 pwq 2: cpus=3D0 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-wg1: 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-wg1: flags=3D0x128 pwq 2: cpus=3D0 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=3D1 refcnt=3D2 pending: wg_packet_handshake_receive_worker workqueue wg-kex-wg2: flags=3D0x6 pwq 8: cpus=3D0-1 flags=3D0x4 nice=3D0 active=3D1 refcnt=3D2 in-flight: 394:wg_packet_handshake_send_worker for 3s workqueue wg-crypt-wg2: flags=3D0x128 pwq 2: cpus=3D0 node=3D0 flags=3D0x0 nice=3D0 active=3D3 refcnt=3D4 pending: wg_packet_decrypt_worker, wg_packet_encrypt_worker, wg_packet_= tx_worker pool 2: cpus=3D0 node=3D0 flags=3D0x0 nice=3D0 hung=3D35s workers=3D7 idle:= 4802 4872 10 4820 870 4902 pool 8: cpus=3D0-1 flags=3D0x4 nice=3D0 hung=3D0s workers=3D25 idle: 12 Showing backtraces of busy workers in stalled worker pools: pool 2: task:kworker/0:0 state:R running task stack:0 pid:9 tgid:9= ppid:2 task_flags:0x4208060 flags:0x00000010 Workqueue: events reg_todo Call trace: __switch_to+0x2b4/0x6e4 arch/arm64/kernel/process.c:775 (T) context_switch kernel/sched/core.c:5526 [inline] __schedule+0x1370/0x2d80 kernel/sched/core.c:7277 preempt_schedule_common+0xd4/0x190 kernel/sched/core.c:7456 preempt_schedule+0x60/0x78 kernel/sched/core.c:7480 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:211 [inline] _raw_spin_unlock_irqrestore+0x94/0x98 kernel/locking/spinlock.c:221 spin_unlock_irqrestore include/linux/spinlock.h:425 [inline] __slab_free+0x194/0x1d0 mm/slub.c:5821 ___cache_free+0x80/0x94 mm/slub.c:6580 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0xb4/0x120 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x118/0x124 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x2c/0x88 mm/kasan/common.c:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4683 [inline] slab_alloc_node mm/slub.c:4996 [inline] kmem_cache_alloc_noprof+0x268/0x5d4 mm/slub.c:5010 skb_clone+0x1ac/0x320 net/core/skbuff.c:2119 do_one_broadcast net/netlink/af_netlink.c:1456 [inline] netlink_broadcast_filtered+0x520/0xd58 net/netlink/af_netlink.c:1539 netlink_broadcast+0x50/0x68 net/netlink/af_netlink.c:1563 uevent_net_broadcast_untagged lib/kobject_uevent.c:331 [inline] kobject_uevent_net_broadcast+0x33c/0x53c lib/kobject_uevent.c:410 kobject_uevent_env+0x518/0x944 lib/kobject_uevent.c:611 call_crda net/wireless/reg.c:574 [inline] reg_query_database+0x278/0x4e4 net/wireless/reg.c:1116 reg_process_hint_core net/wireless/reg.c:2681 [inline] reg_process_hint+0x1b8/0x990 net/wireless/reg.c:3027 reg_process_pending_hints net/wireless/reg.c:3115 [inline] reg_todo+0x168/0x6a4 net/wireless/reg.c:3206 process_one_work kernel/workqueue.c:3396 [inline] process_scheduled_works+0x91c/0x1250 kernel/workqueue.c:3479 worker_thread+0x798/0xbd0 kernel/workqueue.c:3560 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