* [syzbot] [arm?] BUG: workqueue lockup in wg_packet_encrypt_worker
@ 2026-09-14 21:27 syzbot
0 siblings, 0 replies; only message in thread
From: syzbot @ 2026-09-14 21:27 UTC (permalink / raw)
To: Jason, andrew+netdev, davem, edumazet, kuba, linux-arm-kernel,
linux-kernel, netdev, pabeni, syzkaller-bugs, wireguard
Hello,
syzbot found the following issue on:
HEAD commit: 5445d6419962 arm64: Don't read GMID_EL1 when MTE is disabled
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=17fa6925580000
kernel config: https://syzkaller.appspot.com/x/.config?x=56ed23170c168d4c
dashboard link: https://syzkaller.appspot.com/bug?extid=ce2a09d03fdc079a46e9
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/Image-5445d641.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=0 node=0 flags=0x0 nice=0 stuck for 47s!
Showing busy workqueues and worker pools:
workqueue events: flags=0x100
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=14 refcnt=15
pending: 4*nsim_dev_hwstats_traffic_work, vmstat_shepherd, psi_avgs_work, free_obj_work, 3*ovs_dp_masks_rebalance, 4*psi_avgs_work
pwq 6: cpus=1 node=0 flags=0x0 nice=0 active=4 refcnt=5
in-flight: 24:reg_todo for 142s
pending: 3*nsim_dev_hwstats_traffic_work
workqueue events_unbound: flags=0x2
pwq 8: cpus=0-1 flags=0x6 nice=0 active=14 refcnt=15
in-flight: 12:cfg80211_wiphy_work for 140s cfg80211_wiphy_work ,59:cfg80211_wiphy_work for 132s cfg80211_wiphy_work ,42:cfg80211_wiphy_work for 144s cfg80211_wiphy_work ,40:cfg80211_wiphy_work for 125s cfg80211_wiphy_work ,1241:cfg80211_wiphy_work for 145s cfg80211_wiphy_work ,1165:cfg80211_wiphy_work for 145s cfg80211_wiphy_work
pending: 2*macvlan_process_broadcast
pwq 8: cpus=0-1 flags=0x6 nice=0 active=10 refcnt=11
in-flight: 8217:nsim_dev_trap_report_work for 0s
pending: 2*nsim_dev_trap_report_work, crng_reseed, toggle_allocation_gate, 4*nsim_dev_trap_report_work, flush_memcg_stats_dwork
workqueue events_power_efficient: flags=0x82
pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=2
in-flight: 1425:reg_check_chans_work for 73s
pwq 8: cpus=0-1 flags=0x6 nice=0 active=9 refcnt=10
in-flight: 1162:crda_timeout_work for 127s ,1254:check_lifetime for 110s ,8218:gc_worker for 10s
pending: hash_ipportip4_gc, fb_flashcursor, nf_flow_offload_work_gc, 2*neigh_managed_work, wg_ratelimiter_gc_entries
workqueue events_dfl_long: flags=0x2
pwq 8: cpus=0-1 flags=0x6 nice=0 active=6 refcnt=7
pending: 6*defense_work_handler
workqueue rcu_gp: flags=0x108
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2
pending: srcu_invoke_callbacks
workqueue netns: flags=0x6000a
pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=6 MAYDAY
in-flight: 8(RESCUER):cleanup_net for 138s
workqueue mm_percpu_wq: flags=0x108
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2
pending: vmstat_update
workqueue ipv6_addrconf: flags=0x6000a
pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=12 MAYDAY
in-flight: 2822(RESCUER):addrconf_verify_work for 84s
inactive: 6*addrconf_verify_work
workqueue bat_events: flags=0x6000a
pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=50 MAYDAY
in-flight: 2854(RESCUER):batadv_tt_purge for 8s
pending: mayday_cursor_func
inactive: batadv_dat_purge, 2*batadv_bla_periodic_work, 2*batadv_dat_purge, batadv_bla_periodic_work, 2*batadv_iv_send_outstanding_bat_ogm_packet, batadv_dat_purge, batadv_bla_periodic_work, batadv_dat_purge, batadv_bla_periodic_work, batadv_purge_orig, 2*batadv_iv_send_outstanding_bat_ogm_packet, 6*batadv_mcast_mla_update, 4*batadv_iv_send_outstanding_bat_ogm_packet, batadv_purge_orig, 6*batadv_iv_send_outstanding_bat_ogm_packet, 3*batadv_purge_orig, batadv_iv_send_outstanding_bat_ogm_packet, batadv_purge_orig, batadv_dat_purge, batadv_bla_periodic_work, 5*batadv_tt_purge
workqueue wg-kex-wg0: flags=0x124
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=2 refcnt=3
in-flight: 4710:wg_packet_handshake_receive_worker for 52s
pending: wg_packet_handshake_receive_worker
workqueue wg-kex-wg0: flags=0x6
pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=2
in-flight: 8221:wg_packet_handshake_send_worker for 0s
workqueue wg-crypt-wg0: flags=0x128
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=5 refcnt=6
in-flight: 4817:wg_packet_encrypt_worker for 47s ,4306:wg_packet_tx_worker for 47s
pending: wg_packet_decrypt_worker, wg_packet_tx_worker, wg_packet_encrypt_worker
workqueue wg-kex-wg1: flags=0x124
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2
pending: wg_packet_handshake_receive_worker
pwq 6: cpus=1 node=0 flags=0x0 nice=0 active=1 refcnt=2
in-flight: 8225:wg_packet_handshake_receive_worker for 2s
workqueue wg-kex-wg1: flags=0x6
pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=2
in-flight: 14:wg_packet_handshake_send_worker for 20s
workqueue wg-crypt-wg1: flags=0x128
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=3 refcnt=4
pending: wg_packet_decrypt_worker, wg_packet_tx_worker, wg_packet_encrypt_worker
workqueue wg-kex-wg2: flags=0x124
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2
pending: wg_packet_handshake_receive_worker
workqueue wg-crypt-wg2: flags=0x128
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=2 refcnt=3
pending: wg_packet_tx_worker, wg_packet_encrypt_worker
workqueue bond0: flags=0x2000a
pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=5 MAYDAY
pending: bond_arp_monitor
workqueue wg-crypt-wg0: flags=0x128
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=3 refcnt=4
pending: wg_packet_decrypt_worker, wg_packet_encrypt_worker, wg_packet_tx_worker
workqueue wg-kex-wg1: flags=0x124
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=2 refcnt=3
in-flight: 9:wg_packet_handshake_receive_worker for 48s
pending: wg_packet_handshake_receive_worker
pwq 6: cpus=1 node=0 flags=0x0 nice=0 active=2 refcnt=3
in-flight: 26:wg_packet_handshake_receive_worker for 44s wg_packet_handshake_receive_worker
workqueue wg-kex-wg1: flags=0x6
pwq 8: cpus=0-1 flags=0x6 nice=0 active=2 refcnt=3
in-flight: 8216:wg_packet_handshake_send_worker for 0s
pending: wg_packet_handshake_send_worker
workqueue wg-crypt-wg1: flags=0x128
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=3 refcnt=4
pending: wg_packet_decrypt_worker, wg_packet_encrypt_worker, wg_packet_tx_worker
workqueue wg-kex-wg2: flags=0x124
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2
pending: wg_packet_handshake_receive_worker
workqueue wg-kex-wg2: flags=0x6
pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=2
pending: wg_packet_handshake_send_worker
workqueue wg-crypt-wg2: flags=0x128
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=2 refcnt=3
pending: wg_packet_tx_worker, wg_packet_encrypt_worker
workqueue wg-crypt-wg0: flags=0x128
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=2 refcnt=3
pending: wg_packet_tx_worker, wg_packet_encrypt_worker
workqueue wg-kex-wg1: flags=0x6
pwq 8: cpus=0-1 flags=0x6 nice=0 active=2 refcnt=3
pending: 2*wg_packet_handshake_send_worker
workqueue wg-crypt-wg1: flags=0x128
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=2 refcnt=3
pending: wg_packet_tx_worker, wg_packet_encrypt_worker
workqueue wg-kex-wg2: flags=0x6
pwq 8: cpus=0-1 flags=0x6 nice=0 active=2 refcnt=3
pending: 2*wg_packet_handshake_send_worker
workqueue krds_cp_wq#2/0: flags=0x20002
pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=4
in-flight: 8219:rds_connect_worker for 11s
workqueue wg-kex-wg0: flags=0x124
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2
pending: wg_packet_handshake_receive_worker
pwq 6: cpus=1 node=0 flags=0x0 nice=0 active=1 refcnt=2
in-flight: 4902:wg_packet_handshake_receive_worker for 3s
workqueue wg-kex-wg0: flags=0x6
pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=2
pending: wg_packet_handshake_send_worker
workqueue wg-crypt-wg0: flags=0x128
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=3 refcnt=4
in-flight: 865:wg_packet_tx_worker for 53s wg_packet_tx_worker
pending: wg_packet_encrypt_worker
workqueue wg-kex-wg1: flags=0x124
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=2 refcnt=3
in-flight: 4802:wg_packet_handshake_receive_worker for 51s
pending: wg_packet_handshake_receive_worker
workqueue wg-crypt-wg1: flags=0x128
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=2 refcnt=3
pending: wg_packet_tx_worker, wg_packet_encrypt_worker
workqueue wg-kex-wg2: flags=0x124
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2
pending: wg_packet_handshake_receive_worker
workqueue wg-kex-wg2: flags=0x6
pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=2
pending: wg_packet_handshake_send_worker
workqueue wg-crypt-wg2: flags=0x128
pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=3 refcnt=4
pending: wg_packet_decrypt_worker, wg_packet_tx_worker, wg_packet_encrypt_worker
pool 2: cpus=0 node=0 flags=0x0 nice=0 hung=47s workers=10 idle: 10 4809 4898 4708
pool 6: cpus=1 node=0 flags=0x0 nice=0 hung=0s workers=9 idle: 8222 5105 8220 1089 4812
pool 8: cpus=0-1 flags=0x6 nice=0 hung=0s workers=16 manager: 8223
Showing backtraces of busy workers in stalled worker pools:
pool 2:
task:kworker/0:8 state:R running task stack:0 pid:4817 tgid:4817 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:5520 [inline]
__schedule+0x1370/0x2d80 kernel/sched/core.c:7270
preempt_schedule_common+0xd4/0x190 kernel/sched/core.c:7449
preempt_schedule+0x60/0x78 kernel/sched/core.c:7473
__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:3387 [inline]
process_scheduled_works+0x91c/0x1250 kernel/workqueue.c:3470
worker_thread+0x798/0xbd0 kernel/workqueue.c:3551
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:865 tgid:865 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:5520 [inline]
__schedule+0x1370/0x2d80 kernel/sched/core.c:7270
preempt_schedule_common+0xd4/0x190 kernel/sched/core.c:7449
preempt_schedule+0x60/0x78 kernel/sched/core.c:7473
__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_any_authenticated_packet_traversal+0x98/0xc0 drivers/net/wireguard/timers.c:218
wg_packet_create_data_done drivers/net/wireguard/send.c:247 [inline]
wg_packet_tx_worker+0x130/0x75c drivers/net/wireguard/send.c:276
process_one_work kernel/workqueue.c:3387 [inline]
process_scheduled_works+0x91c/0x1250 kernel/workqueue.c:3470
worker_thread+0x798/0xbd0 kernel/workqueue.c:3551
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:4710 tgid:4710 ppid:2 task_flags:0x4208060 flags:0x00000010
Workqueue: wg-kex-wg0 wg_packet_handshake_receive_worker
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
preempt_schedule_common+0xd4/0x190 kernel/sched/core.c:7449
preempt_schedule+0x60/0x78 kernel/sched/core.c:7473
__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]
wg_packet_create_data drivers/net/wireguard/send.c:325 [inline]
wg_packet_send_staged_packets+0xc34/0x1124 drivers/net/wireguard/send.c:388
wg_packet_send_keepalive+0x144/0x248 drivers/net/wireguard/send.c:239
wg_receive_handshake_packet drivers/net/wireguard/receive.c:186 [inline]
wg_packet_handshake_receive_worker+0x5c8/0xcf8 drivers/net/wireguard/receive.c:213
process_one_work kernel/workqueue.c:3387 [inline]
process_scheduled_works+0x91c/0x1250 kernel/workqueue.c:3470
worker_thread+0x798/0xbd0 kernel/workqueue.c:3551
kthread+0x304/0x3d4 kernel/kthread.c:436
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:838
pool 2:
task:kworker/0:6 state:R running task stack:0 pid:4802 tgid:4802 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:5520 [inline]
__schedule+0x1370/0x2d80 kernel/sched/core.c:7270
preempt_schedule_common+0xd4/0x190 kernel/sched/core.c:7449
preempt_schedule+0x60/0x78 kernel/sched/core.c:7473
__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_session_derived+0x5c/0x6c drivers/net/wireguard/timers.c:208
wg_packet_send_handshake_response+0x118/0x264 drivers/net/wireguard/send.c:98
wg_receive_handshake_packet drivers/net/wireguard/receive.c:154 [inline]
wg_packet_handshake_receive_worker+0x570/0xcf8 drivers/net/wireguard/receive.c:213
process_one_work kernel/workqueue.c:3387 [inline]
process_scheduled_works+0x91c/0x1250 kernel/workqueue.c:3470
worker_thread+0x798/0xbd0 kernel/workqueue.c:3551
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: 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:5520 [inline]
__schedule+0x1370/0x2d80 kernel/sched/core.c:7270
preempt_schedule_common+0xd4/0x190 kernel/sched/core.c:7449
preempt_schedule+0x60/0x78 kernel/sched/core.c:7473
__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]
wg_noise_handshake_begin_session+0x698/0x958 drivers/net/wireguard/noise.c:856
wg_packet_send_handshake_response+0x108/0x264 drivers/net/wireguard/send.c:96
wg_receive_handshake_packet drivers/net/wireguard/receive.c:154 [inline]
wg_packet_handshake_receive_worker+0x570/0xcf8 drivers/net/wireguard/receive.c:213
process_one_work kernel/workqueue.c:3387 [inline]
process_scheduled_works+0x91c/0x1250 kernel/workqueue.c:3470
worker_thread+0x798/0xbd0 kernel/workqueue.c:3551
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:4306 tgid:4306 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:5520 [inline]
__schedule+0x1370/0x2d80 kernel/sched/core.c:7270
preempt_schedule_common+0xd4/0x190 kernel/sched/core.c:7449
preempt_schedule+0x60/0x78 kernel/sched/core.c:7473
__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]
keep_key_fresh drivers/net/wireguard/send.c:135 [inline]
wg_packet_create_data_done drivers/net/wireguard/send.c:259 [inline]
wg_packet_tx_worker+0x6bc/0x75c drivers/net/wireguard/send.c:276
process_one_work kernel/workqueue.c:3387 [inline]
process_scheduled_works+0x91c/0x1250 kernel/workqueue.c:3470
worker_thread+0x798/0xbd0 kernel/workqueue.c:3551
kthread+0x304/0x3d4 kernel/kthread.c:436
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:838
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2026-09-14 21:27 [syzbot] [arm?] BUG: workqueue lockup in wg_packet_encrypt_worker syzbot
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