* [syzbot] [keyrings?] [lsm?] BUG: workqueue lockup in key_garbage_collector
@ 2026-10-17 11:26 syzbot
0 siblings, 0 replies; only message in thread
From: syzbot @ 2026-10-17 11:26 UTC (permalink / raw)
To: dhowells, jarkko, jmorris, keyrings, linux-kernel,
linux-security-module, paul, serge, syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: 7a19f0cc94ad Merge branch 'for-next/core' into for-kernelci
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=16320f01580000
kernel config: https://syzkaller.appspot.com/x/.config?x=26d6221a572842ac
dashboard link: https://syzkaller.appspot.com/bug?extid=c15de43f1e7fffbb7b9b
compiler: Debian clang version 22.1.8 (1~deb13u4), 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/296cd4b77dbf/disk-7a19f0cc.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/e57669ed895f/vmlinux-7a19f0cc.xz
kernel image: https://storage.googleapis.com/syzbot-assets/c679c1ad76d4/Image-7a19f0cc.gz.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c15de43f1e7fffbb7b9b@syzkaller.appspotmail.com
BUG: workqueue lockup - pool cpus=0 node=0 flags=0x2 nice=0 stuck for 30s!
Showing busy workqueues and worker pools:
workqueue events: flags=0x100
pwq 2: cpus=0 node=0 flags=0x2 nice=0 active=13 refcnt=14
in-flight: 10:key_garbage_collector for 51s ,1030:request_firmware_work_func for 87s
pending: nsim_dev_hwstats_traffic_work, 2*psi_avgs_work, vmstat_shepherd, 4*ovs_dp_masks_rebalance, 2*psi_avgs_work, delayed_vfree_work
pwq 6: cpus=1 node=0 flags=0x2 nice=0 active=12 refcnt=13
in-flight: 4831:nsim_fib_event_work for 56s ,26:nsim_fib_event_work for 56s
pending: 4*nsim_dev_hwstats_traffic_work, 2*psi_avgs_work, 2*ovs_dp_masks_rebalance, free_ipc, delayed_vfree_work
workqueue events_unbound: flags=0x2
pwq 8: cpus=0-1 flags=0x6 nice=0 active=5 refcnt=6
pending: toggle_allocation_gate, 2*nsim_dev_trap_report_work, flush_memcg_stats_dwork, nsim_dev_trap_report_work
pwq 8: cpus=0-1 flags=0x6 nice=0 active=24 refcnt=25
in-flight: 524:cfg80211_wiphy_work for 56s ,134:cfg80211_wiphy_work for 56s ,12:cfg80211_wiphy_work for 41s ,13:cfg80211_wiphy_work for 57s ,40:cfg80211_wiphy_work for 48s ,1395:cfg80211_wiphy_work for 48s ,41:cfg80211_wiphy_work for 56s ,1171:cfg80211_wiphy_work for 57s cfg80211_wiphy_work
pending: 5*cfg80211_wiphy_work, 2*nsim_dev_trap_report_work, 3*cfg80211_wiphy_work, crng_reseed, cfg80211_wiphy_work, 3*macvlan_process_broadcast
workqueue events_power_efficient: flags=0x82
pwq 8: cpus=0-1 flags=0x6 nice=0 active=6 refcnt=7
pending: neigh_periodic_work, wg_ratelimiter_gc_entries, neigh_managed_work, fb_flashcursor, neigh_managed_work, gc_worker
pwq 8: cpus=0-1 flags=0x6 nice=0 active=2 refcnt=3
pending: neigh_periodic_work, do_cache_clean
workqueue events_dfl_long: flags=0x2
pwq 8: cpus=0-1 flags=0x6 nice=0 active=5 refcnt=6
pending: 5*defense_work_handler
pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=2
pending: defense_work_handler
workqueue mm_percpu_wq: flags=0x108
pwq 2: cpus=0 node=0 flags=0x2 nice=0 active=1 refcnt=3
pending: vmstat_update
pwq 6: cpus=1 node=0 flags=0x2 nice=0 active=1 refcnt=2
pending: vmstat_update
workqueue writeback: flags=0x4a
pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=4 MAYDAY
pending: wb_workfn
workqueue iou_exit: flags=0x2
pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=2
pending: io_ring_exit_work
workqueue mld: flags=0x40108
pwq 2: cpus=0 node=0 flags=0x2 nice=0 active=1 refcnt=3 MAYDAY
pending: mld_dad_work
pwq 6: cpus=1 node=0 flags=0x2 nice=0 active=1 refcnt=70 MAYDAY
in-flight: 4816:mld_ifc_work for 7s
inactive: 3*mld_ifc_work, mld_dad_work, 11*mld_ifc_work, mld_dad_work, 6*mld_ifc_work, mld_dad_work, 8*mld_ifc_work, mld_dad_work, 10*mld_ifc_work, mld_dad_work, mld_ifc_work, 2*mld_dad_work, 2*mld_ifc_work, mld_dad_work, mld_ifc_work, mld_dad_work, 13*mld_ifc_work, 2*mld_dad_work
workqueue ipv6_addrconf: flags=0x6000a
pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=419 MAYDAY
pending: mayday_cursor_func, addrconf_dad_work
inactive: 413*addrconf_dad_work
workqueue bat_events: flags=0x6000a
pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=45 MAYDAY
in-flight: 2856(RESCUER):batadv_tt_purge for 8s
pending: mayday_cursor_func
inactive: 2*batadv_tt_purge, 4*batadv_mcast_mla_update, batadv_purge_orig, 3*batadv_iv_send_outstanding_bat_ogm_packet, batadv_purge_orig, 2*batadv_iv_send_outstanding_bat_ogm_packet, 2*batadv_purge_orig, batadv_iv_send_outstanding_bat_ogm_packet, batadv_purge_orig, batadv_iv_send_outstanding_bat_ogm_packet, batadv_mcast_mla_update, 8*batadv_iv_send_outstanding_bat_ogm_packet, batadv_dat_purge, batadv_bla_periodic_work, batadv_dat_purge, batadv_bla_periodic_work, batadv_dat_purge, batadv_bla_periodic_work, batadv_dat_purge, batadv_bla_periodic_work, batadv_dat_purge, batadv_bla_periodic_work, 2*batadv_tt_purge
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=0x2 nice=0 active=3 refcnt=5 MAYDAY
pending: wg_packet_encrypt_worker, wg_packet_tx_worker, wg_packet_decrypt_worker
pwq 6: cpus=1 node=0 flags=0x2 nice=0 active=4 refcnt=7 MAYDAY
in-flight: 4824:wg_packet_tx_worker for 57s wg_packet_tx_worker
pending: wg_packet_encrypt_worker, wg_packet_decrypt_worker
workqueue wg-crypt-wg1: flags=0x128
pwq 2: cpus=0 node=0 flags=0x2 nice=0 active=3 refcnt=5 MAYDAY
pending: wg_packet_tx_worker, wg_packet_decrypt_worker, wg_packet_encrypt_worker
pwq 6: cpus=1 node=0 flags=0x2 nice=0 active=2 refcnt=5 MAYDAY
pending: wg_packet_decrypt_worker, wg_packet_encrypt_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=0x2 nice=0 active=3 refcnt=5 MAYDAY
pending: wg_packet_decrypt_worker, wg_packet_tx_worker, wg_packet_encrypt_worker
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=0x2 nice=0 active=3 refcnt=6 MAYDAY
pending: wg_packet_encrypt_worker, wg_packet_decrypt_worker, wg_packet_tx_worker
pwq 6: cpus=1 node=0 flags=0x2 nice=0 active=2 refcnt=3
pending: wg_packet_tx_worker, wg_packet_decrypt_worker
workqueue wg-crypt-wg1: flags=0x128
pwq 2: cpus=0 node=0 flags=0x2 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=1 refcnt=2
pending: wg_packet_handshake_send_worker
workqueue wg-crypt-wg2: flags=0x128
pwq 2: cpus=0 node=0 flags=0x2 nice=0 active=3 refcnt=5 MAYDAY
pending: wg_packet_decrypt_worker, wg_packet_tx_worker, wg_packet_encrypt_worker
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=0x2 nice=0 active=3 refcnt=5 MAYDAY
pending: wg_packet_encrypt_worker, wg_packet_tx_worker, wg_packet_decrypt_worker
pwq 6: cpus=1 node=0 flags=0x2 nice=0 active=2 refcnt=5 MAYDAY
pending: wg_packet_tx_worker, wg_packet_decrypt_worker
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=0x2 nice=0 active=3 refcnt=5 MAYDAY
pending: wg_packet_encrypt_worker, wg_packet_tx_worker, wg_packet_decrypt_worker
pwq 6: cpus=1 node=0 flags=0x2 nice=0 active=2 refcnt=5 MAYDAY
pending: wg_packet_decrypt_worker, wg_packet_encrypt_worker
workqueue wg-kex-wg1: flags=0x6
pwq 8: cpus=0-1 flags=0x6 nice=0 active=1 refcnt=2
pending: wg_packet_handshake_send_worker
workqueue wg-crypt-wg1: flags=0x128
pwq 2: cpus=0 node=0 flags=0x2 nice=0 active=3 refcnt=5 MAYDAY
pending: wg_packet_tx_worker, wg_packet_encrypt_worker, wg_packet_decrypt_worker
pwq 6: cpus=1 node=0 flags=0x2 nice=0 active=1 refcnt=4 MAYDAY
pending: 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=0x2 nice=0 active=3 refcnt=5 MAYDAY
pending: wg_packet_decrypt_worker, wg_packet_tx_worker, wg_packet_encrypt_worker
pwq 6: cpus=1 node=0 flags=0x2 nice=0 active=2 refcnt=5 MAYDAY
pending: wg_packet_decrypt_worker, wg_packet_encrypt_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=0x2 nice=0 active=2 refcnt=4 MAYDAY
pending: wg_packet_tx_worker, wg_packet_encrypt_worker
pwq 6: cpus=1 node=0 flags=0x2 nice=0 active=1 refcnt=4 MAYDAY
pending: wg_packet_encrypt_worker
workqueue wg-crypt-wg2: flags=0x128
pwq 2: cpus=0 node=0 flags=0x2 nice=0 active=3 refcnt=4
pending: wg_packet_decrypt_worker, wg_packet_tx_worker, wg_packet_encrypt_worker
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=0x2 nice=0 active=3 refcnt=4
pending: wg_packet_encrypt_worker, wg_packet_decrypt_worker, wg_packet_tx_worker
pwq 6: cpus=1 node=0 flags=0x2 nice=0 active=3 refcnt=6 MAYDAY
in-flight: 4832:wg_packet_tx_worker for 56s wg_packet_tx_worker
pending: wg_packet_encrypt_worker
workqueue wg-crypt-wg1: flags=0x128
pwq 2: cpus=0 node=0 flags=0x2 nice=0 active=3 refcnt=5 MAYDAY
pending: wg_packet_tx_worker, wg_packet_encrypt_worker, wg_packet_decrypt_worker
pwq 6: cpus=1 node=0 flags=0x2 nice=0 active=2 refcnt=5 MAYDAY
pending: wg_packet_encrypt_worker, wg_packet_decrypt_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=0x2 nice=0 active=3 refcnt=5 MAYDAY
pending: wg_packet_decrypt_worker, wg_packet_tx_worker, wg_packet_encrypt_worker
pwq 6: cpus=1 node=0 flags=0x2 nice=0 active=1 refcnt=4 MAYDAY
pending: wg_packet_encrypt_worker
pool 2: cpus=0 node=0 flags=0x2 nice=0 hung=30s workers=6 manager: 4872 idle: 4314 9 4802
pool 6: cpus=1 node=0 flags=0x2 nice=0 hung=7s workers=9 manager: 4925 idle: 24 4817 866
pool 8: cpus=0-1 flags=0x6 nice=0 hung=8s workers=9 manager: 1461
Showing backtraces of busy workers in stalled worker pools:
pool 2:
task:kworker/0:1 state:R running task stack:0 pid:10 tgid:10 ppid:2 task_flags:0x4208060 flags:0x00000010
Workqueue: events key_garbage_collector
Call trace:
__switch_to+0x2b4/0x6e4 arch/arm64/kernel/process.c:775 (T)
context_switch kernel/sched/core.c:5533 [inline]
__schedule+0x135c/0x2b00 kernel/sched/core.c:7284
__schedule_loop kernel/sched/core.c:7361 [inline]
schedule+0x13c/0x20c kernel/sched/core.c:7376
schedule_timeout+0xc0/0x28c kernel/time/sleep_timeout.c:75
do_wait_for_common kernel/sched/completion.c:100 [inline]
__wait_for_common kernel/sched/completion.c:121 [inline]
wait_for_common+0x220/0x394 kernel/sched/completion.c:132
wait_for_completion+0x18/0x24 kernel/sched/completion.c:153
synchronize_rcu_normal+0x28c/0x350 kernel/rcu/tree.c:3355
synchronize_rcu+0x1f4/0x258 kernel/rcu/tree.c:3413
key_garbage_collector+0x728/0x894 security/keys/gc.c:297
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:854
pool 2:
task:kworker/0:2 state:R running task stack:0 pid:1030 tgid:1030 ppid:2 task_flags:0x4208060 flags:0x00000010
Workqueue: events request_firmware_work_func
Call trace:
__switch_to+0x2b4/0x6e4 arch/arm64/kernel/process.c:775 (T)
context_switch kernel/sched/core.c:5533 [inline]
__schedule+0x135c/0x2b00 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+0x16c/0x234 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]
restore_regulatory_settings+0x6f0/0x1650 net/wireless/reg.c:3555
regdb_fw_cb+0x14c/0x1a8 net/wireless/reg.c:1026
request_firmware_work_func+0xe8/0x24c drivers/base/firmware_loader/main.c:1164
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:854
---
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2026-10-17 11:26 [syzbot] [keyrings?] [lsm?] BUG: workqueue lockup in key_garbage_collector syzbot
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