BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 146s!
BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=0 stuck for 146s!
BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=-20 stuck for 140s!
Showing busy workqueues and worker pools:
workqueue events: flags=0x0
pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=5/256 refcnt=6
pending: nsim_dev_hwstats_traffic_work, psi_avgs_work, kfree_rcu_monitor, ima_keys_handler, rht_deferred_worker
pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=15/256 refcnt=16
pending: 3*nsim_dev_hwstats_traffic_work, vmstat_shepherd, binder_deferred_func, ovs_dp_masks_rebalance, 4*psi_avgs_work, kfree_rcu_monitor, 4*ovs_dp_masks_rebalance
workqueue events_highpri: flags=0x10
pwq 1: cpus=0 node=0 flags=0x0 nice=-20 active=1/256 refcnt=2
in-flight: 1059:snd_vmidi_output_work
workqueue events_long: flags=0x0
pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=3/256 refcnt=4
pending: 2*defense_work_handler, br_multicast_gc_work
pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=3/256 refcnt=4
pending: 3*defense_work_handler
workqueue events_unbound: flags=0x2
pwq 4: cpus=0-1 flags=0x4 nice=0 active=10/512 refcnt=11
pending: nsim_dev_trap_report_work, flush_memcg_stats_dwork, 3*macvlan_process_broadcast, crng_reseed, macvlan_process_broadcast, idle_cull_fn, macvlan_process_broadcast, idle_cull_fn
pwq 4: cpus=0-1 flags=0x4 nice=0 active=8/512 refcnt=9
pending: 2*nsim_dev_trap_report_work, toggle_allocation_gate, nsim_dev_trap_report_work, idle_cull_fn, 2*macvlan_process_broadcast, idle_cull_fn
workqueue events_freezable: flags=0x4
pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
pending: update_balloon_stats_func
workqueue events_power_efficient: flags=0x80
pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=6/256 refcnt=7
pending: neigh_periodic_work, 2*neigh_managed_work, neigh_periodic_work, do_cache_clean, gc_worker
pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=2/256 refcnt=3
pending: wg_ratelimiter_gc_entries, check_lifetime
workqueue rcu_gp: flags=0x8
pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
pending: wait_rcu_exp_gp
workqueue mm_percpu_wq: flags=0x8
pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
pending: vmstat_update
pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
pending: vmstat_update
workqueue writeback: flags=0x4a
pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/256 refcnt=2
pending: wb_workfn
pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/256 refcnt=2
pending: wb_workfn
workqueue kblockd: flags=0x18
pwq 3: cpus=1 node=0 flags=0x0 nice=-20 active=1/256 refcnt=2
pending: blk_mq_timeout_work
pwq 1: cpus=0 node=0 flags=0x0 nice=-20 active=2/256 refcnt=3
pending: 2*blk_mq_timeout_work
workqueue usb_hub_wq: flags=0x4
pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=2/256 refcnt=3
in-flight: 786:hub_event hub_event
workqueue dm_bufio_cache: flags=0x8
pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
pending: work_fn
workqueue ipv6_addrconf: flags=0x40008
pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/1 refcnt=3
pending: addrconf_verify_work
inactive: addrconf_verify_work
pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/1 refcnt=4
pending: addrconf_verify_work
inactive: 2*addrconf_verify_work
workqueue krxrpcd: flags=0xa001a
pwq 5: cpus=0-1 node=0 flags=0x4 nice=-20 active=1/1 refcnt=8
pending: rxrpc_peer_keepalive_worker
inactive: 4*rxrpc_peer_keepalive_worker
workqueue bat_events: flags=0xe000a
pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/1 refcnt=27
pending: batadv_nc_worker
inactive: 3*batadv_nc_worker, 4*batadv_mcast_mla_update, 4*batadv_purge_orig, 2*batadv_dat_purge, batadv_tt_purge, 2*batadv_bla_periodic_work, 3*batadv_tt_purge, batadv_dat_purge, 2*batadv_bla_periodic_work, batadv_dat_purge
workqueue wg-crypt-wg0: flags=0x28
pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
pending: wg_packet_encrypt_worker
pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
pending: wg_packet_encrypt_worker
workqueue wg-crypt-wg1: flags=0x28
pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
pending: wg_packet_encrypt_worker
pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
pending: wg_packet_encrypt_worker
workqueue wg-crypt-wg2: flags=0x28
pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
pending: wg_packet_encrypt_worker
pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
pending: wg_packet_encrypt_worker
workqueue wg-crypt-wg0: flags=0x28
pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
pending: wg_packet_encrypt_worker
pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
pending: wg_packet_encrypt_worker
workqueue wg-crypt-wg1: flags=0x28
pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
pending: wg_packet_encrypt_worker
pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
pending: wg_packet_encrypt_worker
workqueue wg-crypt-wg2: flags=0x28
pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
pending: wg_packet_encrypt_worker
pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
pending: wg_packet_encrypt_worker
workqueue wg-kex-wg0: flags=0x6
pwq 4: cpus=0-1 flags=0x4 nice=0 active=2/256 refcnt=3
pending: 2*wg_packet_handshake_send_worker
workqueue wg-kex-wg1: flags=0x6
pwq 4: cpus=0-1 flags=0x4 nice=0 active=2/256 refcnt=3
pending: 2*wg_packet_handshake_send_worker
workqueue wg-kex-wg2: flags=0x6
pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/256 refcnt=2
pending: wg_packet_handshake_send_worker
pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/256 refcnt=2
pending: wg_packet_handshake_send_worker
workqueue wg-crypt-wg0: flags=0x28
pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
pending: wg_packet_encrypt_worker
pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
pending: wg_packet_encrypt_worker
workqueue wg-crypt-wg1: flags=0x28
pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
pending: wg_packet_encrypt_worker
pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
pending: wg_packet_encrypt_worker
workqueue wg-crypt-wg2: flags=0x28
pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
pending: wg_packet_encrypt_worker
pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
pending: wg_packet_encrypt_worker
pool 1: cpus=0 node=0 flags=0x0 nice=-20 hung=146s workers=3 idle: 10 6454
pool 2: cpus=1 node=0 flags=0x0 nice=0 hung=146s workers=8 idle: 27 23 5830 5845 5873 5823 5865
Showing backtraces of running workers in stalled CPU-bound worker pools:
pool 2:
task:kworker/1:2 state:R running task stack:21768 pid:786 ppid:2 flags:0x00004000
Workqueue: usb_hub_wq hub_event
Call Trace:
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x14e2/0x4580 kernel/sched/core.c:6700
schedule+0xbd/0x170 kernel/sched/core.c:6774
schedule_timeout+0x160/0x280 kernel/time/timer.c:2167
do_wait_for_common kernel/sched/completion.c:95 [inline]
__wait_for_common kernel/sched/completion.c:116 [inline]
wait_for_common kernel/sched/completion.c:127 [inline]
wait_for_completion_timeout+0x2bf/0x5a0 kernel/sched/completion.c:167
usb_start_wait_urb+0x164/0x4b0 drivers/usb/core/message.c:64
usb_internal_control_msg drivers/usb/core/message.c:103 [inline]
usb_control_msg+0x233/0x3e0 drivers/usb/core/message.c:154
usb_get_descriptor+0xb1/0x3e0 drivers/usb/core/message.c:794
usb_get_bos_descriptor+0x7e/0x950 drivers/usb/core/config.c:1006
hub_port_init+0x1750/0x2760 drivers/usb/core/hub.c:5141
hub_port_connect drivers/usb/core/hub.c:5430 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5641 [inline]
port_event drivers/usb/core/hub.c:5801 [inline]
hub_event+0x2513/0x49c0 drivers/usb/core/hub.c:5883
process_one_work kernel/workqueue.c:2634 [inline]
process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
NMI backtrace for cpu 0
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.6.94-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:148
Code: cc cc cc cc cc cc cc f3 0f 1e fa 0f 0b 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 66 90 0f 00 2d 63 f0 41 00 f3 0f 1e fa fb f4 cc cc cc cc cc cc cc cc cc cc cc cc 66 0f 1f 00 55 41 57 41 56
RSP: 0018:ffffffff8ca07d80 EFLAGS: 000002c2
RAX: 25ae5c9f89d80400 RBX: ffffffff81618a7b RCX: 25ae5c9f89d80400
RDX: 0000000000000001 RSI: ffffffff8aaab2c0 RDI: ffffffff8afc6900
RBP: ffffffff8ca07eb8 R08: ffff8880b8e36d4b R09: 1ffff110171c6da9
R10: dffffc0000000000 R11: ffffed10171c6daa R12: ffffffff8e49ab28
R13: 0000000000000000 R14: 0000000000000000 R15: 1ffffffff1952670
FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c26cde1 CR3: 00000000229d4000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
arch_safe_halt arch/x86/include/asm/paravirt.h:108 [inline]
default_idle+0x13/0x20 arch/x86/kernel/process.c:753
default_idle_call+0x6c/0xa0 kernel/sched/idle.c:97
cpuidle_idle_call kernel/sched/idle.c:170 [inline]
do_idle+0x1eb/0x510 kernel/sched/idle.c:282
cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:380
rest_init+0x2e2/0x300 init/main.c:732
arch_call_rest_init+0xe/0x10 init/main.c:829
start_kernel+0x459/0x4e0 init/main.c:1074
x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:555
x86_64_start_kernel+0x60/0x60 arch/x86/kernel/head64.c:536
secondary_startup_64_no_verify+0x179/0x17b
----------------
Code disassembly (best guess):
0: cc int3
1: cc int3
2: cc int3
3: cc int3
4: cc int3
5: cc int3
6: cc int3
7: f3 0f 1e fa endbr64
b: 0f 0b ud2
d: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1)
14: 00 00 00
17: f3 0f 1e fa endbr64
1b: 66 90 xchg %ax,%ax
1d: 0f 00 2d 63 f0 41 00 verw 0x41f063(%rip) # 0x41f087
24: f3 0f 1e fa endbr64
28: fb sti
29: f4 hlt
* 2a: c3 ret <-- trapping instruction
2b: cc int3
2c: cc int3
2d: cc int3
2e: cc int3
2f: cc int3
30: cc int3
31: cc int3
32: cc int3
33: cc int3
34: cc int3
35: cc int3
36: cc int3
37: 66 0f 1f 00 nopw (%rax)
3b: 55 push %rbp
3c: 41 57 push %r15
3e: 41 56 push %r14