From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f207.google.com (mail-oi1-f207.google.com [209.85.167.207]) (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 B2C773905F4 for ; Wed, 23 Sep 2026 23:36:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.207 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790206591; cv=none; b=PhwfIQE1xWS0tFSXL3p+JCh5LvXGH6fN60QcSyVHGAsOAf0C2UPlRL6a2+QgjfUgOarPTEgKybNUnRuotZ/uZQ1MIBx8jGXplINmnFKrrr96KWkR6ae6WA2NzIup5Q/NR+Uy5TN+klMI792SqMWUqVm5Nshxa6y5pNhoJS+YIvE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790206591; c=relaxed/simple; bh=HwrsmhlzLYt2UB2adPmTxJ8vqOqCc1cx97NEF26nzuI=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=e5UyAodwOZpvjhCviMhLUIEcvDhklgo6pUma9BkCX2l8okfnpWspmVwwk74vk6Yeyk26pYcsnfiD11Ec5adoG4lrVlD7+BwAILEkfKCNaNJ5vd+QGCoNVSX0+TpzK7bdcbGTvue8P+3BjZndK3gxxXGjRzjOUJu8Sc+1OQbDuGI= 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=209.85.167.207 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-f207.google.com with SMTP id 5614622812f47-4b28d7ffab1so559335b6e.1 for ; Wed, 23 Sep 2026 16:36:29 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1790206588; x=1790811388; h=content-transfer-encoding:content-type: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=Vati2L/agrMYnsY7NOrUEt1G7sB1uSh0yKGcv8E8Aeg=; b=u5VtwcktJ5mwYuk5h7eocpAV/9//qs7so7ImLcXMiQgU4Legmrdiqk7d4ll23a3bZ7 aJ3M5i5YOKgnJlpuhYJUSI4GYdYiXnGwYd/XrhZ3Rp303/QuddKRIGHnqOq2FpbKuZ8V Z95w89ps0o4BNSVNU5OviUOhSM5vPuS3bjOZXRwSFrx+FjZo56h6WgV2//1QWpmgwfvs ZdiLb4F/sQfBmNXHWy/MwvQ66GSd/OEdHWOEg3Syln87AYo/Y+bUr20aRfaHOOKX+TwE FXb2mRpdzaK7LvnaacWIKYajO3A3sExeV14iPzTg2QEtL+840/FXppilkFbcrH7Dp2Z6 DsSA== X-Forwarded-Encrypted: i=1; AKwUvBwsKT8EQrYWMdSf/RYIg5CjJp8Cc9m0tgU37Vfw3WiByQUgKfwyBkECpS9o4dNDuFIzpU7Jr0Dp45naWDI=@vger.kernel.org X-Gm-Message-State: AFuF++nZ/pxqEy05sYf23SrByrc+gh9E+nLTnhktKrNS4V3js7xHDJjE nbMZmh1Mz9VhgYlFLmhwalaK5t8+EoCEXY272SD1V4EWltx2IKyU6DRy63E/5GTRpMDxhpD/w4O OAgmdAvt1NGh7FNavQcaujgRxXcL24jal5XC81tz4OS7hC7WknjutCJ1/4c4= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:238e:b0:495:f8a5:8797 with SMTP id 5614622812f47-4d727417502mr691784b6e.0.1790206588603; Wed, 23 Sep 2026 16:36:28 -0700 (PDT) Date: Wed, 23 Sep 2026 16:36:28 -0700 In-Reply-To: <6aa866b9.a211d2ce.1a5198.029c.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6ab4627c.80e1c6cc.1e8e5f.0006.GAE@google.com> Subject: Re: [syzbot] [wireguard?] [arm?] BUG: workqueue lockup in wg_packet_encrypt_worker From: syzbot To: Jason@zx2c4.com, andrew+netdev@lunn.ch, andrew@lunn.ch, davem@davemloft.net, edumazet@google.com, jason@zx2c4.com, kuba@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com, wireguard@lists.zx2c4.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable syzbot has found a reproducer for the following issue on: HEAD commit: 7dc79bb50ab6 Merge branch 'for-next/core' into for-kernelci 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=3D13047405580000 kernel config: https://syzkaller.appspot.com/x/.config?x=3Dd8d86a985566711= 3 dashboard link: https://syzkaller.appspot.com/bug?extid=3Dce2a09d03fdc079a4= 6e9 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-= 1~exp1~20260613092250.77), Debian LLD 22.1.8 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=3D17c5cd2558000= 0 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/4b09bb2b5517/disk-= 7dc79bb5.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/9e8dab043921/vmlinux-= 7dc79bb5.xz kernel image: https://storage.googleapis.com/syzbot-assets/2151d5f44d15/Ima= ge-7dc79bb5.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit= : Reported-by: syzbot+ce2a09d03fdc079a46e9@syzkaller.appspotmail.com BUG: workqueue lockup - pool cpus=3D0 node=3D0 flags=3D0x0 nice=3D0 stuck f= or 38s! 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: 4789:nsim_fib_event_work for 36s ,9:nsim_fib_event_work for = 41s nsim_fib_event_work pending: 2*nsim_dev_hwstats_traffic_work, 3*psi_avgs_work, vmstat_sheph= erd, 2*rht_deferred_worker, psi_avgs_work, free_obj_work, drm_fb_helper_dam= age_work, 4*ovs_dp_masks_rebalance pwq 6: cpus=3D1 node=3D0 flags=3D0x0 nice=3D0 active=3D8 refcnt=3D9 pending: 2*nsim_dev_hwstats_traffic_work, 6*ovs_dp_masks_rebalance workqueue events_unbound: flags=3D0x2 pwq 8: cpus=3D0-1 flags=3D0x6 nice=3D0 active=3D20 refcnt=3D21 in-flight: 93:cfg80211_wiphy_work for 40s cfg80211_wiphy_work ,12:nsim_= dev_trap_report_work for 3s ,5000:nsim_dev_trap_report_work for 5s ,3177:cf= g80211_wiphy_work for 40s cfg80211_wiphy_work ,13:cfg80211_wiphy_work for 4= 0s cfg80211_wiphy_work ,3281:cfg80211_wiphy_work for 40s cfg80211_wiphy_wor= k ,3390:cfg80211_wiphy_work for 40s cfg80211_wiphy_work ,1148:linkwatch_eve= nt for 39s ,2981:cfg80211_wiphy_work for 35s cfg80211_wiphy_work pending: nsim_dev_trap_report_work, toggle_allocation_gate, nsim_dev_tr= ap_report_work, flush_memcg_stats_dwork, macvlan_process_broadcast workqueue events_power_efficient: flags=3D0x82 pwq 8: cpus=3D0-1 flags=3D0x6 nice=3D0 active=3D7 refcnt=3D8 in-flight: 845:neigh_periodic_work for 2s ,40:gc_worker for 21s pending: wg_ratelimiter_gc_entries, 2*neigh_managed_work, do_cache_clea= n, fb_flashcursor workqueue events_dfl_long: flags=3D0x2 pwq 8: cpus=3D0-1 flags=3D0x6 nice=3D0 active=3D10 refcnt=3D11 in-flight: 4998:defense_work_handler for 7s pending: 9*defense_work_handler workqueue netns: flags=3D0x6000a pwq 8: cpus=3D0-1 flags=3D0x6 nice=3D0 active=3D1 refcnt=3D4 in-flight: 3525:cleanup_net for 42s 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 32s workqueue mld: flags=3D0x40108 pwq 2: cpus=3D0 node=3D0 flags=3D0x0 nice=3D0 active=3D1 refcnt=3D51 in-flight: 4966:mld_ifc_work for 38s inactive: mld_ifc_work, mld_dad_work, 2*mld_ifc_work, mld_dad_work, mld= _ifc_work, 2*mld_dad_work, 7*mld_ifc_work, 2*mld_dad_work, 4*mld_ifc_work, = mld_dad_work, 6*mld_ifc_work, 4*mld_dad_work, 4*mld_ifc_work, mld_dad_work,= 8*mld_ifc_work, mld_dad_work, mld_ifc_work, mld_dad_work, mld_ifc_work pwq 6: cpus=3D1 node=3D0 flags=3D0x0 nice=3D0 active=3D1 refcnt=3D83 pending: mld_dad_work inactive: 3*mld_dad_work, 7*mld_ifc_work, 3*mld_dad_work, 3*mld_ifc_wor= k, mld_dad_work, 9*mld_ifc_work, mld_dad_work, mld_ifc_work, mld_dad_work, = 4*mld_ifc_work, mld_dad_work, 3*mld_ifc_work, 2*mld_dad_work, 4*mld_ifc_wor= k, mld_dad_work, mld_ifc_work, 4*mld_dad_work, 4*mld_ifc_work, 2*mld_dad_wo= rk, 6*mld_ifc_work, mld_dad_work, 6*mld_ifc_work, 2*mld_dad_work, 3*mld_ifc= _work, mld_dad_work, 2*mld_ifc_work, mld_dad_work, 2*mld_ifc_work, mld_dad_= work, mld_ifc_work workqueue ipv6_addrconf: flags=3D0x6000a pwq 8: cpus=3D0-1 flags=3D0x6 nice=3D0 active=3D1 refcnt=3D282 in-flight: 1446:addrconf_dad_work for 41s inactive: 277*addrconf_dad_work, addrconf_verify_work workqueue bat_events: flags=3D0x6000a pwq 8: cpus=3D0-1 flags=3D0x6 nice=3D0 active=3D1 refcnt=3D51 MAYDAY in-flight: 2854(RESCUER):batadv_tt_purge for 15s inactive: 4*batadv_tt_purge, 6*batadv_iv_send_outstanding_bat_ogm_packe= t, 6*batadv_mcast_mla_update, 6*batadv_iv_send_outstanding_bat_ogm_packet, = 6*batadv_purge_orig, 4*batadv_iv_send_outstanding_bat_ogm_packet, batadv_da= t_purge, batadv_bla_periodic_work, batadv_dat_purge, batadv_bla_periodic_wo= rk, batadv_dat_purge, batadv_bla_periodic_work, batadv_dat_purge, batadv_bl= a_periodic_work, batadv_dat_purge, batadv_bla_periodic_work, batadv_dat_pur= ge, batadv_bla_periodic_work, 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 2: cpus=3D0 node=3D0 flags=3D0x0 nice=3D0 active=3D4 refcnt=3D5 in-flight: 4953:wg_packet_encrypt_worker for 38s ,10:wg_packet_tx_worke= r for 38s pending: wg_packet_tx_worker, wg_packet_encrypt_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=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_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 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=3D3 refcnt=3D4 pending: wg_packet_decrypt_worker, 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_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-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_decrypt_worker workqueue wg-kex-wg1: flags=3D0x124 pwq 2: cpus=3D0 node=3D0 flags=3D0x0 nice=3D0 active=3D2 refcnt=3D3 in-flight: 866:wg_packet_handshake_receive_worker for 41s pending: wg_packet_handshake_receive_worker pwq 6: cpus=3D1 node=3D0 flags=3D0x0 nice=3D0 active=3D1 refcnt=3D2 in-flight: 4476:wg_packet_handshake_receive_worker for 0s workqueue wg-kex-wg1: flags=3D0x6 pwq 8: cpus=3D0-1 flags=3D0x6 nice=3D0 active=3D1 refcnt=3D2 in-flight: 4997:wg_packet_handshake_send_worker for 3s 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=3D1 refcnt=3D2 pending: 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 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 6: cpus=3D1 node=3D0 flags=3D0x0 nice=3D0 active=3D1 refcnt=3D2 pending: wg_packet_encrypt_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 pwq 6: cpus=3D1 node=3D0 flags=3D0x0 nice=3D0 active=3D1 refcnt=3D2 in-flight: 4960:wg_packet_handshake_receive_worker for 8s 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 pwq 6: cpus=3D1 node=3D0 flags=3D0x0 nice=3D0 active=3D1 refcnt=3D2 pending: wg_packet_tx_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 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=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 in-flight: 4835:wg_packet_encrypt_worker for 11s 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 pwq 6: cpus=3D1 node=3D0 flags=3D0x0 nice=3D0 active=3D1 refcnt=3D2 in-flight: 26:wg_packet_handshake_receive_worker for 0s 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-wg1: flags=3D0x124 pwq 2: cpus=3D0 node=3D0 flags=3D0x0 nice=3D0 active=3D1 refcnt=3D2 pending: wg_packet_handshake_receive_worker pwq 6: cpus=3D1 node=3D0 flags=3D0x0 nice=3D0 active=3D2 refcnt=3D3 in-flight: 4999:wg_packet_handshake_receive_worker for 5s 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 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=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_tx_worker pool 2: cpus=3D0 node=3D0 flags=3D0x0 nice=3D0 hung=3D38s workers=3D7 idle:= 4996 pool 6: cpus=3D1 node=3D0 flags=3D0x0 nice=3D0 hung=3D0s workers=3D7 idle: = 1091 24 pool 8: cpus=3D0-1 flags=3D0x6 nice=3D0 hung=3D2s workers=3D16 manager: 54 Showing backtraces of busy workers in stalled worker pools: pool 2: task:kworker/0:4 state:R running task stack:0 pid:4953 tgid:4= 953 ppid:2 task_flags:0x4208060 flags:0x00000010 Workqueue: wg-crypt-wg0 wg_packet_encrypt_worker Call trace: __switch_to+0x2b4/0x6e4 arch/arm64/kernel/process.c:775 (T) context_switch kernel/sched/core.c:5533 [inline] __schedule+0x1370/0x2d80 kernel/sched/core.c:7284 preempt_schedule_common+0xd4/0x190 kernel/sched/core.c:7463 preempt_schedule+0x60/0x78 kernel/sched/core.c:7487 __local_bh_enable_ip+0x20c/0x35c kernel/softirq.c:480 __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] ptr_ring_consume_bh include/linux/ptr_ring.h:399 [inline] wg_packet_encrypt_worker+0x25c/0x1290 drivers/net/wireguard/send.c:293 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 pool 2: task:kworker/0:3 state:R running task stack:0 pid:4789 tgid:4= 789 ppid:2 task_flags:0x4208060 flags:0x00000010 Workqueue: events nsim_fib_event_work Call trace: __switch_to+0x2b4/0x6e4 arch/arm64/kernel/process.c:775 (T) context_switch kernel/sched/core.c:5533 [inline] __schedule+0x1370/0x2d80 kernel/sched/core.c:7284 __schedule_loop kernel/sched/core.c:7361 [inline] schedule+0x13c/0x20c kernel/sched/core.c:7376 schedule_timeout+0x13c/0x28c kernel/time/sleep_timeout.c:99 schedule_timeout_uninterruptible+0x78/0xbc kernel/time/sleep_timeout.c:158 msleep+0x3c/0x68 kernel/time/sleep_timeout.c:318 nsim_fib4_rt_add drivers/net/netdevsim/fib.c:369 [inline] nsim_fib4_rt_insert drivers/net/netdevsim/fib.c:432 [inline] nsim_fib4_event drivers/net/netdevsim/fib.c:464 [inline] nsim_fib_event+0x5564/0x60c4 drivers/net/netdevsim/fib.c:884 nsim_fib_event_work+0x1d8/0x320 drivers/net/netdevsim/fib.c:1493 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 pool 2: task:kworker/0:5 state:R running task stack:0 pid:4966 tgid:4= 966 ppid:2 task_flags:0x4208060 flags:0x00000010 Workqueue: mld mld_ifc_work Call trace: __switch_to+0x2b4/0x6e4 arch/arm64/kernel/process.c:775 (T) context_switch kernel/sched/core.c:5533 [inline] __schedule+0x1370/0x2d80 kernel/sched/core.c:7284 preempt_schedule_common+0xd4/0x190 kernel/sched/core.c:7463 preempt_schedule+0x60/0x78 kernel/sched/core.c:7487 __local_bh_enable_ip+0x20c/0x35c kernel/softirq.c:480 local_bh_enable include/linux/bottom_half.h:33 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:923 [inline] __dev_queue_xmit+0x14d4/0x2bc0 net/core/dev.c:4961 dev_queue_xmit include/linux/netdevice.h:3461 [inline] neigh_hh_output include/net/neighbour.h:544 [inline] neigh_output include/net/neighbour.h:558 [inline] ip6_finish_output2+0xd24/0x1b68 net/ipv6/ip6_output.c:138 __ip6_finish_output net/ipv6/ip6_output.c:-1 [inline] ip6_finish_output+0x230/0x618 net/ipv6/ip6_output.c:221 NF_HOOK_COND include/linux/netfilter.h:314 [inline] ip6_output+0x2d0/0x644 net/ipv6/ip6_output.c:248 dst_output include/net/dst.h:470 [inline] NF_HOOK+0x14c/0x464 include/linux/netfilter.h:325 mld_sendpack+0x7f4/0xfec net/ipv6/mcast.c:1890 mld_send_cr net/ipv6/mcast.c:2191 [inline] mld_ifc_work+0x76c/0x9e4 net/ipv6/mcast.c:2739 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 pool 2: task:kworker/0:1 state:R running task stack:0 pid:10 tgid:1= 0 ppid:2 task_flags:0x4208060 flags:0x00000010 Workqueue: wg-crypt-wg0 wg_packet_tx_worker Call trace: __switch_to+0x2b4/0x6e4 arch/arm64/kernel/process.c:775 (T) context_switch kernel/sched/core.c:5533 [inline] __schedule+0x1370/0x2d80 kernel/sched/core.c:7284 preempt_schedule_common+0xd4/0x190 kernel/sched/core.c:7463 preempt_schedule+0x60/0x78 kernel/sched/core.c:7487 __local_bh_enable_ip+0x20c/0x35c kernel/softirq.c:480 local_bh_enable include/linux/bottom_half.h:33 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:923 [inline] mod_peer_timer+0x21c/0x25c drivers/net/wireguard/timers.c:38 wg_timers_data_sent+0xb4/0xc8 drivers/net/wireguard/timers.c:151 wg_packet_create_data_done drivers/net/wireguard/send.c:257 [inline] wg_packet_tx_worker+0x204/0x75c drivers/net/wireguard/send.c:276 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 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 nsim_fib_event_work Call trace: __switch_to+0x2b4/0x6e4 arch/arm64/kernel/process.c:775 (T) context_switch kernel/sched/core.c:5533 [inline] __schedule+0x1370/0x2d80 kernel/sched/core.c:7284 __schedule_loop kernel/sched/core.c:7361 [inline] schedule+0x13c/0x20c kernel/sched/core.c:7376 schedule_timeout+0x13c/0x28c kernel/time/sleep_timeout.c:99 schedule_timeout_uninterruptible+0x78/0xbc kernel/time/sleep_timeout.c:158 msleep+0x3c/0x68 kernel/time/sleep_timeout.c:318 nsim_fib4_rt_add drivers/net/netdevsim/fib.c:369 [inline] nsim_fib4_rt_insert drivers/net/netdevsim/fib.c:432 [inline] nsim_fib4_event drivers/net/netdevsim/fib.c:464 [inline] nsim_fib_event+0x5564/0x60c4 drivers/net/netdevsim/fib.c:884 nsim_fib_event_work+0x1d8/0x320 drivers/net/netdevsim/fib.c:1493 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 pool 2: task:kworker/0:2 state:R running task stack:0 pid:866 tgid:8= 66 ppid:2 task_flags:0x4208060 flags:0x00000010 Workqueue: wg-kex-wg1 wg_packet_handshake_receive_worker Call trace: __switch_to+0x2b4/0x6e4 arch/arm64/kernel/process.c:775 (T) context_switch kernel/sched/core.c:5533 [inline] __schedule+0x1370/0x2d80 kernel/sched/core.c:7284 preempt_schedule_common+0xd4/0x190 kernel/sched/core.c:7463 preempt_schedule+0x60/0x78 kernel/sched/core.c:7487 __local_bh_enable_ip+0x20c/0x35c kernel/softirq.c:480 local_bh_enable include/linux/bottom_half.h:33 [inline] __alloc_skb+0x1c8/0x610 net/core/skbuff.c:699 alloc_skb include/linux/skbuff.h:1384 [inline] wg_socket_send_buffer_to_peer+0x44/0x174 drivers/net/wireguard/socket.c:19= 1 wg_packet_send_handshake_response+0x168/0x264 drivers/net/wireguard/send.c= :103 wg_receive_handshake_packet drivers/net/wireguard/receive.c:154 [inline] wg_packet_handshake_receive_worker+0x570/0xcf8 drivers/net/wireguard/recei= ve.c:213 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 --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.