INFO: task kworker/u8:5:1000 blocked for more than 143 seconds. Not tainted 6.14.0-rc7-syzkaller-00196-g88d324e69ea9 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u8:5 state:D stack:25616 pid:1000 tgid:1000 ppid:2 task_flags:0x4208060 flags:0x00004000 Workqueue: ipv6_addrconf addrconf_dad_work Call Trace: context_switch kernel/sched/core.c:5378 [inline] __schedule+0xf43/0x5890 kernel/sched/core.c:6765 __schedule_loop kernel/sched/core.c:6842 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6857 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6914 __mutex_lock_common kernel/locking/mutex.c:662 [inline] __mutex_lock+0x6bd/0xb10 kernel/locking/mutex.c:730 rtnl_net_lock include/linux/rtnetlink.h:129 [inline] addrconf_dad_work+0x121/0x14e0 net/ipv6/addrconf.c:4190 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3400 kthread+0x3af/0x750 kernel/kthread.c:464 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Showing all locks held in the system: 2 locks held by kthreadd/2: 3 locks held by kworker/0:0/9: 2 locks held by kworker/0:1/10: 3 locks held by kworker/u8:0/12: 3 locks held by kworker/u8:1/13: 3 locks held by kworker/1:0/26: #0: ffff88801b081d48 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3213 #1: ffffc90000a0fd18 ((reg_check_chans).work){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3214 #2: ffffffff8fefa3e8 (rtnl_mutex){+.+.}-{4:4}, at: reg_check_chans_work+0x84/0x1130 net/wireless/reg.c:2481 1 lock held by khungtaskd/31: #0: ffffffff8e1bd140 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff8e1bd140 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8e1bd140 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x7f/0x390 kernel/locking/lockdep.c:6746 3 locks held by kworker/u8:2/36: 2 locks held by kworker/1:1/47: 3 locks held by kworker/u8:3/53: 2 locks held by kworker/u8:4/62: 3 locks held by kworker/0:2/975: 3 locks held by kworker/u8:5/1000: #0: ffff88803123a148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3213 #1: ffffc90003dffd18 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3214 #2: ffffffff8fefa3e8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:129 [inline] #2: ffffffff8fefa3e8 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0x121/0x14e0 net/ipv6/addrconf.c:4190 3 locks held by kworker/u8:6/1109: 6 locks held by kworker/u8:7/1160: 3 locks held by kworker/1:2/2151: 1 lock held by kworker/u8:8/3922: 3 locks held by kworker/u8:9/5097: 3 locks held by syslogd/5192: 4 locks held by udevd/5210: 2 locks held by getty/5593: #0: ffff888034df80a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc90002fde2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0xfba/0x1480 drivers/tty/n_tty.c:2211 2 locks held by syz-executor/5826: 3 locks held by kworker/0:3/5839: 3 locks held by kworker/0:4/5878: 2 locks held by kworker/0:5/5879: 2 locks held by kworker/0:6/5880: 2 locks held by kworker/0:7/5898: 2 locks held by kworker/1:4/5901: 5 locks held by syz-executor/5971: 4 locks held by syz-executor/5979: 5 locks held by kworker/u8:10/6116: 4 locks held by kworker/1:8/6156: #0: ffff888033ffa948 ((wq_completion)wg-kex-wg1#10){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3213 #1: ffffc90003397d18 ((work_completion)(&({ do { const void *__vpp_verify = (typeof((worker) + 0))((void *)0); (void)__vpp_verify; } while (0); ({ unsigned long __ptr; __asm__ ("" : "=r"(__ptr) : "0"((typeof(*((worker))) *)(( unsigned long)((worker))))); (typeof((typeof(*((worker))) *)(( unsigned long)((worker))))) (__ptr + (((__per_cpu_offset[(cpu)])))); }); })->work)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3214 #2: ffff88805bd11308 (&wg->static_identity.lock){++++}-{4:4}, at: wg_noise_handshake_consume_response+0x229/0x940 drivers/net/wireguard/noise.c:742 #3: ffff88807fd3c5b8 (&handshake->lock){++++}-{4:4}, at: wg_noise_handshake_consume_response+0x2f2/0x940 drivers/net/wireguard/noise.c:753 1 lock held by syz.5.61/6523: 4 locks held by syz.4.75/6632: 3 locks held by sed/6635: 3 locks held by kworker/u8:11/6636: 3 locks held by kworker/u8:12/6637: 3 locks held by kworker/u8:13/6638: 2 locks held by kworker/u8:15/6640: 3 locks held by kworker/u8:16/6641: 3 locks held by kworker/u8:17/6642: 2 locks held by kworker/0:8/6643: 3 locks held by kworker/u8:18/6644: 2 locks held by kworker/u8:20/6648: ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.14.0-rc7-syzkaller-00196-g88d324e69ea9 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:236 [inline] watchdog+0xf62/0x12b0 kernel/hung_task.c:399 kthread+0x3af/0x750 kernel/kthread.c:464 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 6116 Comm: kworker/u8:10 Not tainted 6.14.0-rc7-syzkaller-00196-g88d324e69ea9 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Workqueue: events_unbound cfg80211_wiphy_work RIP: 0010:__orc_find+0x4f/0xf0 arch/x86/kernel/unwind_orc.c:100 Code: fe 48 89 f0 72 7b 48 b9 00 00 00 00 00 fc ff df 49 89 ff 48 89 fd eb 0c 48 8d 6b 04 49 89 df 49 39 ec 72 4e 4c 89 e2 48 29 ea <48> 89 d6 48 c1 ea 3f 48 c1 fe 02 48 01 f2 48 d1 fa 48 8d 5c 95 00 RSP: 0018:ffffc90000006c48 EFLAGS: 00000216 RAX: ffffffff90f472c4 RBX: ffffffff90726b68 RCX: dffffc0000000000 RDX: 000000000000000c RSI: 0000000000000000 RDI: ffffffff90726b58 RBP: ffffffff90726b58 R08: ffffffff90f47300 R09: ffffffff90f7995c R10: ffffc90000006cf8 R11: 0000000000005ece R12: ffffffff90726b64 R13: ffffffff815ece04 R14: ffffffff90726b58 R15: ffffffff90726b58 FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd558069068 CR3: 000000000df80000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: orc_find arch/x86/kernel/unwind_orc.c:227 [inline] unwind_next_frame+0x2be/0x20c0 arch/x86/kernel/unwind_orc.c:494 arch_stack_walk+0x95/0x100 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4115 [inline] slab_alloc_node mm/slub.c:4164 [inline] kmem_cache_alloc_noprof+0x226/0x3d0 mm/slub.c:4171 skb_ext_maybe_cow net/core/skbuff.c:6852 [inline] skb_ext_add+0xf8/0x770 net/core/skbuff.c:6926 nf_bridge_unshare net/bridge/br_netfilter_hooks.c:169 [inline] br_nf_forward_ip.part.0+0x28/0x820 net/bridge/br_netfilter_hooks.c:684 br_nf_forward_ip net/bridge/br_netfilter_hooks.c:679 [inline] br_nf_forward+0xf11/0x1bd0 net/bridge/br_netfilter_hooks.c:776 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline] nf_hook_slow+0xbb/0x200 net/netfilter/core.c:626 nf_hook+0x474/0x7d0 include/linux/netfilter.h:269 NF_HOOK include/linux/netfilter.h:312 [inline] __br_forward+0x1be/0x5b0 net/bridge/br_forward.c:115 deliver_clone+0x5b/0xa0 net/bridge/br_forward.c:131 br_flood+0x491/0x5e0 net/bridge/br_forward.c:249 br_handle_frame_finish+0xea2/0x1c90 net/bridge/br_input.c:220 br_nf_hook_thresh+0x303/0x410 net/bridge/br_netfilter_hooks.c:1170 br_nf_pre_routing_finish_ipv6+0x76a/0xfb0 net/bridge/br_netfilter_ipv6.c:154 NF_HOOK include/linux/netfilter.h:314 [inline] br_nf_pre_routing_ipv6+0x3ce/0x8c0 net/bridge/br_netfilter_ipv6.c:184 br_nf_pre_routing+0x860/0x15b0 net/bridge/br_netfilter_hooks.c:508 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline] nf_hook_bridge_pre net/bridge/br_input.c:282 [inline] br_handle_frame+0xad7/0x14a0 net/bridge/br_input.c:433 __netif_receive_skb_core.constprop.0+0xa20/0x4330 net/core/dev.c:5790 __netif_receive_skb_one_core+0xb1/0x1e0 net/core/dev.c:5894 __netif_receive_skb+0x1d/0x160 net/core/dev.c:6009 process_backlog+0x443/0x15f0 net/core/dev.c:6357 __napi_poll.constprop.0+0xb7/0x550 net/core/dev.c:7191 napi_poll net/core/dev.c:7260 [inline] net_rx_action+0xa94/0x1010 net/core/dev.c:7382 handle_softirqs+0x213/0x8f0 kernel/softirq.c:561 do_softirq kernel/softirq.c:462 [inline] do_softirq+0xb2/0xf0 kernel/softirq.c:449 __local_bh_enable_ip+0x100/0x120 kernel/softirq.c:389 spin_unlock_bh include/linux/spinlock.h:396 [inline] cfg80211_inform_single_bss_data+0x9b9/0x1df0 net/wireless/scan.c:2383 cfg80211_inform_bss_data+0x205/0x3ba0 net/wireless/scan.c:3222 cfg80211_inform_bss_frame_data+0x272/0x7a0 net/wireless/scan.c:3317 ieee80211_bss_info_update+0x311/0xab0 net/mac80211/scan.c:226 ieee80211_rx_bss_info net/mac80211/ibss.c:1102 [inline] ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1581 [inline] ieee80211_ibss_rx_queued_mgmt+0x189c/0x2f50 net/mac80211/ibss.c:1608 ieee80211_iface_process_skb net/mac80211/iface.c:1612 [inline] ieee80211_iface_work+0xc15/0xf50 net/mac80211/iface.c:1666 cfg80211_wiphy_work+0x3ed/0x570 net/wireless/core.c:435 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3400 kthread+0x3af/0x750 kernel/kthread.c:464 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244