INFO: task kworker/0:7:6267 blocked for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:7 state:D stack:18848 pid:6267 tgid:6267 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: events_power_efficient reg_check_chans_work
Call Trace:
context_switch kernel/sched/core.c:5295 [inline]
__schedule+0x1585/0x5310 kernel/sched/core.c:6907
__schedule_loop kernel/sched/core.c:6989 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7004
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7061
__mutex_lock_common kernel/locking/mutex.c:692 [inline]
__mutex_lock+0x7fe/0x1300 kernel/locking/mutex.c:776
class_wiphy_constructor include/net/cfg80211.h:6441 [inline]
reg_leave_invalid_chans net/wireless/reg.c:2452 [inline]
reg_check_chans_work+0x171/0xfe0 net/wireless/reg.c:2467
process_one_work+0x949/0x1650 kernel/workqueue.c:3279
process_scheduled_works kernel/workqueue.c:3362 [inline]
worker_thread+0xb46/0x1140 kernel/workqueue.c:3443
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Showing all locks held in the system:
2 locks held by kworker/u8:1/13:
1 lock held by kworker/R-mm_pe/14:
#0: ffffffff8e7fec68 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2749 [inline]
#0: ffffffff8e7fec68 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xd38/0x1210 kernel/workqueue.c:3614
1 lock held by khungtaskd/30:
#0: ffffffff8e9603e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
#0: ffffffff8e9603e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
#0: ffffffff8e9603e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
1 lock held by kworker/R-write/32:
#0: ffffffff8e7fec68 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2749 [inline]
#0: ffffffff8e7fec68 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xd38/0x1210 kernel/workqueue.c:3614
4 locks held by kworker/u8:6/194:
3 locks held by kworker/1:2/796:
#0: ffff8880b2a2a548 ((wq_completion)wg-kex-wg2#31){+.+.}-{0:0}, at: process_one_work+0x855/0x1650 kernel/workqueue.c:3254
#1: ffffc90004297c40 ((work_completion)(&({ do { const void *__vpp_verify = (typeof((worker) + 0))((void *)0); (void)__vpp_verify; } while (0); ({ unsigned long __ptr; __ptr = (unsigned long) ((__typeof_unqual__(*((worker))) *)(( unsigned long)((worker)))); (typeof((__typeof_unqual__(*((worker))) *)(( unsigned long)((worker))))) (__ptr + (((__per_cpu_offset[(cpu)])))); }); })->work)){+.+.}-{0:0}, at: process_one_work+0x87c/0x1650 kernel/workqueue.c:3255
#2: ffff8880962fc890 (&handshake->lock){++++}-{4:4}, at: wg_noise_handshake_begin_session+0x36/0xbd0 drivers/net/wireguard/noise.c:822
4 locks held by kworker/u8:7/1134:
3 locks held by kworker/u8:8/1152:
3 locks held by kworker/0:2/1209:
#0: ffff88813ff47548 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x855/0x1650 kernel/workqueue.c:3254
#1: ffffc9000526fc40 (deferred_process_work){+.+.}-{0:0}, at: process_one_work+0x87c/0x1650 kernel/workqueue.c:3255
#2: ffffffff8fdea308 (rtnl_mutex){+.+.}-{4:4}, at: switchdev_deferred_process_work+0xe/0x20 net/switchdev/switchdev.c:104
3 locks held by kworker/R-ipv6_/3181:
#0: ffff888032e59948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x855/0x1650 kernel/workqueue.c:3254
#1: ffffc9000cd6fc00 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work+0x87c/0x1650 kernel/workqueue.c:3255
#2: ffffffff8fdea308 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
#2: ffffffff8fdea308 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_verify_work+0x19/0x30 net/ipv6/addrconf.c:4739
1 lock held by kworker/R-bat_e/3406:
#0: ffffffff8e7fec68 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2749 [inline]
#0: ffffffff8e7fec68 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xd38/0x1210 kernel/workqueue.c:3614
1 lock held by klogd/5178:
2 locks held by udevd/5189:
1 lock held by dhcpcd/5485:
2 locks held by crond/5562:
2 locks held by getty/5585:
#0: ffff888037e080a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0 drivers/tty/n_tty.c:2211
4 locks held by kworker/0:3/6057:
5 locks held by kworker/0:4/6173:
4 locks held by kworker/0:7/6267:
#0: ffff88813ff46148 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x855/0x1650 kernel/workqueue.c:3254
#1: ffffc90003b27c40 ((reg_check_chans).work){+.+.}-{0:0}, at: process_one_work+0x87c/0x1650 kernel/workqueue.c:3255
#2: ffffffff8fdea308 (rtnl_mutex){+.+.}-{4:4}, at: reg_check_chans_work+0xa5/0xfe0 net/wireless/reg.c:2464
#3: ffff88809e060788 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: class_wiphy_constructor include/net/cfg80211.h:6441 [inline]
#3: ffff88809e060788 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: reg_leave_invalid_chans net/wireless/reg.c:2452 [inline]
#3: ffff88809e060788 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: reg_check_chans_work+0x171/0xfe0 net/wireless/reg.c:2467
3 locks held by kworker/u8:9/11016:
4 locks held by kworker/1:7/12410:
2 locks held by kworker/1:3/3870:
4 locks held by kworker/u8:0/16128:
2 locks held by kworker/1:0/26800:
1 lock held by kworker/R-wg-cr/5785:
#0: ffffffff8e7fec68 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2749 [inline]
#0: ffffffff8e7fec68 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xd38/0x1210 kernel/workqueue.c:3614
1 lock held by kworker/R-wg-cr/5795:
4 locks held by kworker/u8:3/7887:
3 locks held by kworker/0:0/8084:
3 locks held by kworker/0:6/8086:
4 locks held by kworker/1:5/8107:
#0: ffff888065b89d48 ((wq_completion)wg-kex-wg1#8){+.+.}-{0:0}, at: process_one_work+0x855/0x1650 kernel/workqueue.c:3254
#1: ffffc9000d9ffc40 ((work_completion)(&({ do { const void *__vpp_verify = (typeof((worker) + 0))((void *)0); (void)__vpp_verify; } while (0); ({ unsigned long __ptr; __ptr = (unsigned long) ((__typeof_unqual__(*((worker))) *)(( unsigned long)((worker)))); (typeof((__typeof_unqual__(*((worker))) *)(( unsigned long)((worker))))) (__ptr + (((__per_cpu_offset[(cpu)])))); }); })->work)){+.+.}-{0:0}, at: process_one_work+0x87c/0x1650 kernel/workqueue.c:3255
#2: ffff88801ff49348 (&wg->static_identity.lock){++++}-{4:4}, at: wg_noise_handshake_consume_initiation+0x1a1/0x9a0 drivers/net/wireguard/noise.c:598
#3: ffff888068c40338 (&handshake->lock){++++}-{4:4}, at: wg_noise_handshake_consume_initiation+0x58b/0x9a0 drivers/net/wireguard/noise.c:632
1 lock held by kworker/R-wg-cr/8278:
#0: ffffffff8e7fec68 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x2e/0x3a0 kernel/workqueue.c:2691
1 lock held by syz.8.29390/25087:
3 locks held by kworker/u8:2/29760:
4 locks held by kworker/1:1/29775:
#0: ffff888053b1e948 ((wq_completion)wg-kex-wg2#29){+.+.}-{0:0}, at: process_one_work+0x855/0x1650 kernel/workqueue.c:3254
#1: ffffc9000d87fc40 ((work_completion)(&({ do { const void *__vpp_verify = (typeof((worker) + 0))((void *)0); (void)__vpp_verify; } while (0); ({ unsigned long __ptr; __ptr = (unsigned long) ((__typeof_unqual__(*((worker))) *)(( unsigned long)((worker)))); (typeof((__typeof_unqual__(*((worker))) *)(( unsigned long)((worker))))) (__ptr + (((__per_cpu_offset[(cpu)])))); }); })->work)){+.+.}-{0:0}, at: process_one_work+0x87c/0x1650 kernel/workqueue.c:3255
#2: ffff8880a8121348 (&wg->static_identity.lock){++++}-{4:4}, at: wg_noise_handshake_consume_initiation+0x1a1/0x9a0 drivers/net/wireguard/noise.c:598
#3: ffff8880961920f0 (&handshake->lock){++++}-{4:4}, at: wg_noise_handshake_consume_initiation+0x58b/0x9a0 drivers/net/wireguard/noise.c:632
4 locks held by kworker/u8:4/29804:
3 locks held by kworker/u8:5/30261:
3 locks held by syz-executor/30784:
3 locks held by kworker/0:1/3576:
2 locks held by syz-executor/3916:
#0: ffff888054d34ec0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_dev_do_close net/bluetooth/hci_core.c:500 [inline]
#0: ffff888054d34ec0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_unregister_dev+0x212/0x5a0 net/bluetooth/hci_core.c:2716
#1: ffff888054d340c0 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_close_sync+0x640/0x10e0 net/bluetooth/hci_sync.c:5346
1 lock held by kworker/R-wg-cr/4136:
#0: ffffffff8e7fec68 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2749 [inline]
#0: ffffffff8e7fec68 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xd38/0x1210 kernel/workqueue.c:3614
1 lock held by kworker/R-wg-cr/4141:
#0: ffffffff8e7fec68 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2749 [inline]
#0: ffffffff8e7fec68 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xd38/0x1210 kernel/workqueue.c:3614
1 lock held by kworker/R-wg-cr/4146:
#0: ffffffff8e7fec68 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2749 [inline]
#0: ffffffff8e7fec68 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xd38/0x1210 kernel/workqueue.c:3614
4 locks held by syz.3.31910/6217:
4 locks held by kworker/u8:10/6227:
4 locks held by kworker/u8:11/6228:
4 locks held by kworker/u8:12/6229:
6 locks held by kworker/u8:13/6232:
5 locks held by kworker/u8:14/6233:
2 locks held by syz-executor/6235:
4 locks held by kworker/u8:15/6236:
#0: ffff888059ffd148 ((wq_completion)wg-kex-wg1#7){+.+.}-{0:0}, at: process_one_work+0x855/0x1650 kernel/workqueue.c:3254
#1: ffffc9000d48fc40 ((work_completion)(&peer->transmit_handshake_work)){+.+.}-{0:0}, at: process_one_work+0x87c/0x1650 kernel/workqueue.c:3255
#2: ffff88801ff49348 (&wg->static_identity.lock){++++}-{4:4}, at: wg_noise_handshake_create_initiation+0x12f/0x830 drivers/net/wireguard/noise.c:529
#3: ffff888068c40338 (&handshake->lock){++++}-{4:4}, at: wg_noise_handshake_create_initiation+0x140/0x830 drivers/net/wireguard/noise.c:530
4 locks held by kworker/u8:16/6238:
#0: ffff8880933e0948 ((wq_completion)wg-kex-wg2#28){+.+.}-{0:0}, at: process_one_work+0x855/0x1650 kernel/workqueue.c:3254
#1: ffffc9000d4afc40 ((work_completion)(&peer->transmit_handshake_work)){+.+.}-{0:0}, at: process_one_work+0x87c/0x1650 kernel/workqueue.c:3255
#2: ffff8880a8121348 (&wg->static_identity.lock){++++}-{4:4}, at: wg_noise_handshake_create_initiation+0x12f/0x830 drivers/net/wireguard/noise.c:529
#3: ffff8880961920f0 (&handshake->lock){++++}-{4:4}, at: wg_noise_handshake_create_initiation+0x140/0x830 drivers/net/wireguard/noise.c:530
3 locks held by kworker/0:5/6239:
4 locks held by kworker/u8:17/6241:
3 locks held by kworker/u8:18/6245:
2 locks held by kworker/0:8/6248:
3 locks held by kworker/u8:19/6249:
1 lock held by syz-executor/6250:
4 locks held by kworker/u8:20/6252:
3 locks held by kworker/0:9/6255:
4 locks held by kworker/u8:21/6257:
2 locks held by syz-executor/6258:
2 locks held by kworker/u8:22/6259:
1 lock held by kworker/1:4/6260:
1 lock held by kworker/0:10/6263:
#0: ffffffff8e7fec68 (wq_pool_attach_mutex){+.+.}-{4:4}, at: set_pf_worker kernel/workqueue.c:3368 [inline]
#0: ffffffff8e7fec68 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_thread+0x57/0x1140 kernel/workqueue.c:3394
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:161 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x135/0x170 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:346 [inline]
watchdog+0xfd9/0x1030 kernel/hung_task.c:515
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 6233 Comm: kworker/u8:14 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
Workqueue: wg-kex-wg2 wg_packet_handshake_send_worker
RIP: 0010:unwind_next_frame+0x182c/0x23c0 arch/x86/kernel/unwind_orc.c:663
Code: 0f 85 0c 02 00 00 c6 05 51 0f d0 11 01 4c 89 f7 e8 b9 0b 00 00 e9 f8 01 00 00 48 8b 54 24 08 48 8d 5a 02 48 83 c2 03 48 89 d8 <48> c1 e8 03 0f b6 04 28 84 c0 0f 85 49 0a 00 00 48 89 d0 48 c1 e8
RSP: 0018:ffffc90000a07d58 EFLAGS: 00000286
RAX: ffffffff90c74b04 RBX: ffffffff90c74b04 RCX: 0000000000000000
RDX: ffffffff90c74b05 RSI: 0000000000000001 RDI: ffffc90000a07e88
RBP: dffffc0000000000 R08: ffffc90000a07e87 R09: 0000000000000000
R10: ffffc90000a07e78 R11: fffff52000140fd1 R12: ffffc90000a07e78
R13: 1ffff92000140fc7 R14: ffffc90000a07e28 R15: 1ffffffff218e960
FS: 0000000000000000(0000) GS:ffff888125116000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f096ed96228 CR3: 000000005fb30000 CR4: 00000000003526f0
Call Trace:
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
unpoison_slab_object mm/kasan/common.c:340 [inline]
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4459 [inline]
slab_alloc_node mm/slub.c:4788 [inline]
kmem_cache_alloc_node_noprof+0x384/0x690 mm/slub.c:4840
__alloc_skb+0x1d0/0x7d0 net/core/skbuff.c:702
alloc_skb include/linux/skbuff.h:1383 [inline]
nlmsg_new include/net/netlink.h:1055 [inline]
fdb_notify+0xa6/0x160 net/bridge/br_fdb.c:188
br_fdb_update+0x4c8/0x690 net/bridge/br_fdb.c:1040
br_handle_frame_finish+0x573/0x1b40 net/bridge/br_input.c:144
br_nf_hook_thresh+0x3dd/0x4c0 net/bridge/br_netfilter_hooks.c:-1
br_nf_pre_routing_finish_ipv6+0xa3a/0xd70 net/bridge/br_netfilter_ipv6.c:-1
NF_HOOK include/linux/netfilter.h:318 [inline]
br_nf_pre_routing_ipv6+0x374/0x6f0 net/bridge/br_netfilter_ipv6.c:184
nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline]
nf_hook_bridge_pre net/bridge/br_input.c:291 [inline]
br_handle_frame+0x1277/0x1510 net/bridge/br_input.c:442
__netif_receive_skb_core+0x98f/0x31a0 net/core/dev.c:6037
__netif_receive_skb_one_core net/core/dev.c:6148 [inline]
__netif_receive_skb net/core/dev.c:6263 [inline]
process_backlog+0x76d/0x1950 net/core/dev.c:6615
__napi_poll+0xae/0x340 net/core/dev.c:7679
napi_poll net/core/dev.c:7742 [inline]
net_rx_action+0x627/0xf70 net/core/dev.c:7894
handle_softirqs+0x22a/0x870 kernel/softirq.c:626
do_softirq+0x76/0xd0 kernel/softirq.c:523
__local_bh_enable_ip+0xf8/0x130 kernel/softirq.c:450
blake2s_compress+0xf9/0x1eb0 lib/crypto/x86/blake2s.h:42
blake2s_update+0x14b/0x450 lib/crypto/blake2s.c:119
hmac+0x1fc/0x3b0 drivers/net/wireguard/noise.c:324
kdf drivers/net/wireguard/noise.c:360 [inline]
message_ephemeral+0x233/0x310 drivers/net/wireguard/noise.c:493
wg_noise_handshake_create_initiation+0x257/0x830 drivers/net/wireguard/noise.c:545
wg_packet_send_handshake_initiation drivers/net/wireguard/send.c:34 [inline]
wg_packet_handshake_send_worker+0x18d/0x350 drivers/net/wireguard/send.c:51
process_one_work+0x949/0x1650 kernel/workqueue.c:3279
process_scheduled_works kernel/workqueue.c:3362 [inline]
worker_thread+0xb46/0x1140 kernel/workqueue.c:3443
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245