syzbot

INFO: task kworker/u8:4:64 blocked for more than 143 seconds.
      Not tainted 6.14.0-rc2-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:4    state:D stack:20304 pid:64    tgid:64    ppid:2      task_flags:0x4208060 flags:0x00004000
Workqueue: netns cleanup_net
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5377 [inline]
 __schedule+0x190e/0x4c90 kernel/sched/core.c:6764
 __schedule_loop kernel/sched/core.c:6841 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6856
 schedule_timeout+0xb0/0x290 kernel/time/sleep_timeout.c:75
 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+0x355/0x620 kernel/sched/completion.c:148
 __flush_workqueue+0x575/0x1280 kernel/workqueue.c:3998
 drain_workqueue+0xc9/0x3a0 kernel/workqueue.c:4111
 destroy_workqueue+0xba/0xc40 kernel/workqueue.c:5856
 wg_destruct+0x198/0x2e0 drivers/net/wireguard/device.c:255
 netdev_run_todo+0xd48/0xf30 net/core/dev.c:11159
 default_device_exit_batch+0xa24/0xaa0 net/core/dev.c:12352
 ops_exit_list net/core/net_namespace.c:177 [inline]
 cleanup_net+0x8af/0xd60 net/core/net_namespace.c:652
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xa68/0x1840 kernel/workqueue.c:3317
 worker_thread+0x870/0xd30 kernel/workqueue.c:3398
 kthread+0x7ab/0x920 kernel/kthread.c:464
 ret_from_fork+0x4d/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 kworker/R-mm_pe/13:
 #0: ffffffff8e7e3e48 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x31/0x390 kernel/workqueue.c:2676
2 locks held by kworker/1:0/25:
1 lock held by khungtaskd/30:
 #0: ffffffff8e9387e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #0: ffffffff8e9387e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8e9387e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6746
2 locks held by kworker/1:1/46:
2 locks held by kworker/u8:3/47:
4 locks held by kworker/u8:4/64:
 #0: ffff88801baed948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline]
 #0: ffff88801baed948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1840 kernel/workqueue.c:3317
 #1: ffffc9000214fc60 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline]
 #1: ffffc9000214fc60 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1840 kernel/workqueue.c:3317
 #2: ffffffff8fcb45d0 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0x17a/0xd60 net/core/net_namespace.c:606
 #3: ffff88807d9014e8 (&wg->device_update_lock){+.+.}-{4:4}, at: wg_destruct+0x110/0x2e0 drivers/net/wireguard/device.c:249
3 locks held by kworker/u8:6/1144:
 #0: ffff88801ac81148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline]
 #0: ffff88801ac81148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1840 kernel/workqueue.c:3317
 #1: ffffc9000453fc60 ((work_completion)(&pool->idle_cull_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline]
 #1: ffffc9000453fc60 ((work_completion)(&pool->idle_cull_work)){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1840 kernel/workqueue.c:3317
 #2: ffffffff8e7e3e48 (wq_pool_attach_mutex){+.+.}-{4:4}, at: idle_cull_fn+0xd5/0x760 kernel/workqueue.c:2958
2 locks held by getty/5580:
 #0: ffff8880355ca0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002fde2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211
1 lock held by kworker/R-wg-cr/5868:
 #0: ffffffff8e7e3e48 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x31/0x390 kernel/workqueue.c:2676
1 lock held by kworker/R-wg-cr/5869:
 #0: ffffffff8e7e3e48 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2734 [inline]
 #0: ffffffff8e7e3e48 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xaf5/0x10a0 kernel/workqueue.c:3533
2 locks held by kworker/R-wg-cr/5870:
1 lock held by kworker/R-wg-cr/5872:
 #0: ffffffff8e7e3e48 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2734 [inline]
 #0: ffffffff8e7e3e48 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xaf5/0x10a0 kernel/workqueue.c:3533
2 locks held by kworker/R-wg-cr/5873:
 #0: ffffffff8e7e3e48 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2734 [inline]
 #0: ffffffff8e7e3e48 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xaf5/0x10a0 kernel/workqueue.c:3533
 #1: ffffffff8e7f6280 (sched_map-wait-type-override){+.+.}-{3:3}, at: sched_submit_work kernel/sched/core.c:6797 [inline]
 #1: ffffffff8e7f6280 (sched_map-wait-type-override){+.+.}-{3:3}, at: schedule+0x90/0x320 kernel/sched/core.c:6855
2 locks held by kworker/R-wg-cr/5874:
2 locks held by kworker/R-wg-cr/5875:
2 locks held by kworker/R-wg-cr/5881:
4 locks held by kworker/1:3/5890:
2 locks held by kworker/1:5/5895:
2 locks held by kworker/1:6/5896:
2 locks held by kworker/1:7/5909:
2 locks held by kworker/R-wg-cr/15204:
2 locks held by kworker/R-wg-cr/15205:
2 locks held by kworker/R-wg-cr/16820:
2 locks held by kworker/R-wg-cr/16821:
2 locks held by kworker/R-wg-cr/17099:
2 locks held by kworker/R-wg-cr/17100:
1 lock held by kworker/R-wg-cr/17102:
 #0: ffffffff8e7e3e48 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_detach_from_pool kernel/workqueue.c:2734 [inline]
 #0: ffffffff8e7e3e48 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xaf5/0x10a0 kernel/workqueue.c:3533
2 locks held by dhcpcd/19450:
 #0: ffff88806406e258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1624 [inline]
 #0: ffff88806406e258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x32/0xcb0 net/packet/af_packet.c:3253
 #1: ffffffff8e93dcb8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:302 [inline]
 #1: ffffffff8e93dcb8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x381/0x830 kernel/rcu/tree_exp.h:996

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.14.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x198/0x320 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+0x1058/0x10a0 kernel/hung_task.c:399
 kthread+0x7ab/0x920 kernel/kthread.c:464
 ret_from_fork+0x4d/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: 17100 Comm: kworker/R-wg-cr Not tainted 6.14.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Workqueue: wg-crypt-wg1 wg_packet_encrypt_worker
RIP: 0010:unwind_next_frame+0x0/0x22d0 arch/x86/kernel/unwind_orc.c:469
Code: a4 ff 44 89 f1 80 e1 07 80 c1 03 38 c1 7c 91 4c 89 f7 e8 63 45 ba 00 eb 87 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 55 41 57 41 56 41 55 41 54 53 48 81 ec 98 00 00 00 49
RSP: 0018:ffffc90000a181b8 EFLAGS: 00000002
RAX: 0000000000000001 RBX: ffffc90000a181c0 RCX: ffffffff917c1000
RDX: dffffc0000000000 RSI: ffffffff81ab0dc8 RDI: ffffc90000a181c0
RBP: ffffc90000a18250 R08: 0000000000000000 R09: ffffc90000a182b0
R10: dffffc0000000000 R11: ffffffff81ab0e90 R12: ffff888025a29e00
R13: ffffffff81ab0e90 R14: ffffc90000a182a0 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f03f8a8eea7 CR3: 00000000295f8000 CR4: 0000000000350ef0
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
 __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:394
 kasan_kmalloc include/linux/kasan.h:260 [inline]
 __kmalloc_cache_noprof+0x243/0x390 mm/slub.c:4325
 kmalloc_noprof include/linux/slab.h:901 [inline]
 dummy_urb_enqueue+0x7d/0x780 drivers/usb/gadget/udc/dummy_hcd.c:1273
 usb_hcd_submit_urb+0x36e/0x1e80 drivers/usb/core/hcd.c:1533
 ath9k_hif_usb_reg_in_cb+0x4ce/0x6e0 drivers/net/wireless/ath/ath9k/hif_usb.c:790
 __usb_hcd_giveback_urb+0x42e/0x6e0 drivers/usb/core/hcd.c:1650
 dummy_timer+0x856/0x4620 drivers/usb/gadget/udc/dummy_hcd.c:1994
 __run_hrtimer kernel/time/hrtimer.c:1801 [inline]
 __hrtimer_run_queues+0x59d/0xd30 kernel/time/hrtimer.c:1865
 hrtimer_run_softirq+0x19a/0x2c0 kernel/time/hrtimer.c:1882
 handle_softirqs+0x2d6/0x9b0 kernel/softirq.c:561
 __do_softirq kernel/softirq.c:595 [inline]
 invoke_softirq kernel/softirq.c:435 [inline]
 __irq_exit_rcu+0xf7/0x220 kernel/softirq.c:662
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:678
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:skb_headlen include/linux/skbuff.h:2482 [inline]
RIP: 0010:__skb_flow_dissect+0x2ff/0x7d00 net/core/flow_dissector.c:1072
Code: f8 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 b0 75 00 00 44 0f b7 bb b8 00 00 00 48 8d 7b 70 48 89 f8 48 c1 e8 03 42 0f b6 04 20 <84> c0 0f 85 a9 75 00 00 44 8b 73 70 48 83 c3 74 48 89 d8 48 c1 e8
RSP: 0018:ffffc90002ec6d80 EFLAGS: 00000212
RAX: 0000000000000000 RBX: ffff88802b522640 RCX: ffffc90002ec7101
RDX: ffff888025a29e00 RSI: 0000000000000000 RDI: ffff88802b5226b0
RBP: ffffc90002ec73b8 R08: ffffffff89bb223d R09: 0000000000000000
R10: dffffc0000000000 R11: fffff520005d8e96 R12: dffffc0000000000
R13: 0000000000000000 R14: ffff88802b522640 R15: 0000000000000000
 __skb_get_hash_net+0xca/0xcb0 net/core/flow_dissector.c:1888
 skb_get_hash include/linux/skbuff.h:1616 [inline]
 encrypt_packet drivers/net/wireguard/send.c:173 [inline]
 wg_packet_encrypt_worker+0x3c5/0x16b0 drivers/net/wireguard/send.c:297
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xa68/0x1840 kernel/workqueue.c:3317
 rescuer_thread+0x63f/0x10a0 kernel/workqueue.c:3494
 kthread+0x7ab/0x920 kernel/kthread.c:464
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>