syzbot

INFO: task kworker/u8:5:1093 blocked for more than 143 seconds.
      Not tainted 6.14.0-rc4-syzkaller-00052-gac9c34d1e45a #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:5    state:D stack:25328 pid:1093  tgid:1093  ppid:2      task_flags:0x4208060 flags:0x00004000
Workqueue: netns cleanup_net
Call Trace:
 <TASK>
 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
 fib_net_exit_batch+0x15/0xa0 net/ipv4/fib_frontend.c:1646
 ops_exit_list+0x128/0x180 net/core/net_namespace.c:177
 cleanup_net+0x5c6/0xb30 net/core/net_namespace.c:652
 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3236
 process_scheduled_works kernel/workqueue.c:3317 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3398
 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
 </TASK>
INFO: task kworker/0:5:5883 blocked for more than 143 seconds.
      Not tainted 6.14.0-rc4-syzkaller-00052-gac9c34d1e45a #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:5     state:D stack:25216 pid:5883  tgid:5883  ppid:2      task_flags:0x4208060 flags:0x00004000
Workqueue: events reg_todo
Call Trace:
 <TASK>
 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
 class_wiphy_constructor include/net/cfg80211.h:6061 [inline]
 reg_process_self_managed_hints+0x95/0x1f0 net/wireless/reg.c:3206
 reg_todo+0x684/0x910 net/wireless/reg.c:3219
 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3236
 process_scheduled_works kernel/workqueue.c:3317 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3398
 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
 </TASK>
INFO: task kworker/0:7:5909 blocked for more than 143 seconds.
      Not tainted 6.14.0-rc4-syzkaller-00052-gac9c34d1e45a #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:7     state:D stack:25232 pid:5909  tgid:5909  ppid:2      task_flags:0x4208060 flags:0x00004000
Workqueue: events_power_efficient crda_timeout_work
Call Trace:
 <TASK>
 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
 crda_timeout_work+0x15/0x50 net/wireless/reg.c:540
 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3236
 process_scheduled_works kernel/workqueue.c:3317 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3398
 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
 </TASK>

Showing all locks held in the system:
1 lock held by kthreadd/2:
3 locks held by kworker/0:1/9:
 #0: ffff88801b081d48 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3211
 #1: ffffc900000e7d18 ((reg_check_chans).work){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3212
 #2: ffffffff8fef8f28 (rtnl_mutex){+.+.}-{4:4}, at: reg_check_chans_work+0x84/0x1130 net/wireless/reg.c:2480
3 locks held by kworker/u8:0/11:
8 locks held by kworker/u8:1/12:
3 locks held by kworker/u8:2/16:
 #0: ffff888030f79148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3211
 #1: ffffc90000157d18 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3212
 #2: ffffffff8fef8f28 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:129 [inline]
 #2: ffffffff8fef8f28 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_verify_work+0x12/0x30 net/ipv6/addrconf.c:4730
1 lock held by khungtaskd/31:
 #0: ffffffff8e1bcc80 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #0: ffffffff8e1bcc80 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8e1bcc80 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x7f/0x390 kernel/locking/lockdep.c:6746
3 locks held by kworker/u8:3/52:
3 locks held by kworker/u8:4/62:
4 locks held by kworker/u8:5/1093:
 #0: ffff88801bef5948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3211
 #1: ffffc90003fefd18 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3212
 #2: ffffffff8fee3290 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xca/0xb30 net/core/net_namespace.c:606
 #3: ffffffff8fef8f28 (rtnl_mutex){+.+.}-{4:4}, at: fib_net_exit_batch+0x15/0xa0 net/ipv4/fib_frontend.c:1646
3 locks held by kworker/u8:6/1162:
3 locks held by kworker/u8:7/2907:
3 locks held by kworker/u8:8/2963:
3 locks held by kworker/u8:9/2986:
3 locks held by kworker/u8:10/3002:
2 locks held by kworker/u8:11/3013:
1 lock held by syslogd/5193:
2 locks held by udevd/5211:
2 locks held by getty/5598:
 #0: ffff88814e1880a0 (&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/5828:
2 locks held by syz-executor/5837:
2 locks held by kworker/1:3/5843:
1 lock held by kworker/R-wg-cr/5867:
 #0: ffffffff8e076188 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2734 [inline]
 #0: ffffffff8e076188 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0x836/0xe80 kernel/workqueue.c:3527
1 lock held by kworker/R-wg-cr/5871:
 #0: ffffffff8e076188 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2734 [inline]
 #0: ffffffff8e076188 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0x836/0xe80 kernel/workqueue.c:3527
1 lock held by kworker/R-wg-cr/5876:
 #0: ffffffff8e076188 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2734 [inline]
 #0: ffffffff8e076188 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0x836/0xe80 kernel/workqueue.c:3527
1 lock held by kworker/R-wg-cr/5877:
 #0: ffffffff8e076188 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2734 [inline]
 #0: ffffffff8e076188 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0x836/0xe80 kernel/workqueue.c:3527
1 lock held by kworker/R-wg-cr/5878:
 #0: ffffffff8e076188 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2734 [inline]
 #0: ffffffff8e076188 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0x836/0xe80 kernel/workqueue.c:3527
1 lock held by kworker/R-wg-cr/5879:
 #0: ffffffff8e076188 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2734 [inline]
 #0: ffffffff8e076188 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0x836/0xe80 kernel/workqueue.c:3527
1 lock held by kworker/R-wg-cr/5880:
4 locks held by kworker/0:5/5883:
 #0: ffff88801b080d48 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3211
 #1: ffffc900042dfd18 (reg_work){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3212
 #2: ffffffff8fef8f28 (rtnl_mutex){+.+.}-{4:4}, at: reg_todo+0x1c/0x910 net/wireless/reg.c:3216
 #3: ffff888027670768 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: class_wiphy_constructor include/net/cfg80211.h:6061 [inline]
 #3: ffff888027670768 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: reg_process_self_managed_hints+0x95/0x1f0 net/wireless/reg.c:3206
2 locks held by kworker/0:6/5884:
3 locks held by kworker/1:4/5901:
3 locks held by kworker/0:7/5909:
 #0: ffff88801b081d48 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3211
 #1: ffffc9000438fd18 ((crda_timeout).work){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3212
 #2: ffffffff8fef8f28 (rtnl_mutex){+.+.}-{4:4}, at: crda_timeout_work+0x15/0x50 net/wireless/reg.c:540
1 lock held by syz.0.8/5949:
6 locks held by syz.2.11/5961:
3 locks held by kworker/u8:12/5969:
2 locks held by kworker/0:9/5973:
1 lock held by sed/5975:
4 locks held by syz-executor/5976:
2 locks held by kworker/0:10/5979:
2 locks held by kworker/0:11/5981:
2 locks held by kworker/1:7/5982:
3 locks held by kworker/u8:18/5983:
2 locks held by kworker/1:8/5984:

=============================================

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.14.0-rc4-syzkaller-00052-gac9c34d1e45a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __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
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 12 Comm: kworker/u8:1 Not tainted 6.14.0-rc4-syzkaller-00052-gac9c34d1e45a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: events_unbound cfg80211_wiphy_work
RIP: 0010:__read_once_word_nocheck+0x3/0x10 include/asm-generic/rwonce.h:68
Code: fa b2 00 e9 3c f9 ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 8b 07 <c3> cc cc cc cc 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90000a27ee0 EFLAGS: 00000202
RAX: ffffffff817c1c20 RBX: 0000000000000002 RCX: ffffc90000118000
RDX: 1ffff92000144f01 RSI: ffff88801d28da00 RDI: ffffc90000117920
RBP: ffffc90000a27fa0 R08: ffffc90000a27f8c R09: ffffffff90f68e16
R10: ffffc90000a27f58 R11: 0000000000007c1a R12: ffffc90000a27fa8
R13: ffffc90000a27f58 R14: ffffc90000117928 R15: ffffc90000117920
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9a37640000 CR3: 0000000033a40000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 deref_stack_reg arch/x86/kernel/unwind_orc.c:406 [inline]
 unwind_next_frame+0xadb/0x20c0 arch/x86/kernel/unwind_orc.c:585
 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_clone+0x190/0x3f0 net/core/skbuff.c:1994
 deliver_clone+0x3f/0xa0 net/bridge/br_forward.c:125
 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:5793
 __netif_receive_skb_one_core+0xb1/0x1e0 net/core/dev.c:5897
 __netif_receive_skb+0x1d/0x160 net/core/dev.c:6012
 process_backlog+0x443/0x15f0 net/core/dev.c:6360
 __napi_poll.constprop.0+0xb7/0x550 net/core/dev.c:7194
 napi_poll net/core/dev.c:7263 [inline]
 net_rx_action+0xa94/0x1010 net/core/dev.c:7385
 handle_softirqs+0x213/0x8f0 kernel/softirq.c:561
 do_softirq kernel/softirq.c:462 [inline]
 do_softirq+0xb2/0xf0 kernel/softirq.c:449
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x100/0x120 kernel/softirq.c:389
 spin_unlock_bh include/linux/spinlock.h:396 [inline]
 cfg80211_put_bss+0x1b4/0x280 net/wireless/scan.c:3346
 ieee80211_rx_bss_put net/mac80211/scan.c:37 [inline]
 ieee80211_rx_bss_put+0x43/0x60 net/mac80211/scan.c:32
 ieee80211_rx_bss_info net/mac80211/ibss.c:1174 [inline]
 ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1581 [inline]
 ieee80211_ibss_rx_queued_mgmt+0x1a18/0x2f50 net/mac80211/ibss.c:1608
 ieee80211_iface_process_skb net/mac80211/iface.c:1611 [inline]
 ieee80211_iface_work+0xc15/0xf50 net/mac80211/iface.c:1665
 cfg80211_wiphy_work+0x3ed/0x570 net/wireless/core.c:435
 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3236
 process_scheduled_works kernel/workqueue.c:3317 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3398
 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
 </TASK>