INFO: task syz.4.2643:12889 blocked for more than 142 seconds.
      Not tainted 6.11.0-rc7-syzkaller-00151-gd42f7708e27c #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.2643      state:D stack:26624 pid:12889 tgid:12889 ppid:10363  flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x1800/0x4a60 kernel/sched/core.c:6529
 __schedule_loop kernel/sched/core.c:6606 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6621
 request_wait_answer fs/fuse/dev.c:409 [inline]
 __fuse_request_send fs/fuse/dev.c:428 [inline]
 fuse_simple_request+0x1199/0x1b90 fs/fuse/dev.c:515
 fuse_flush+0x69f/0x950 fs/fuse/file.c:542
 filp_flush+0xb5/0x160 fs/open.c:1526
 filp_close+0x1e/0x40 fs/open.c:1539
 __range_close fs/file.c:718 [inline]
 __close_range+0x35e/0x940 fs/file.c:787
 __do_sys_close_range fs/open.c:1592 [inline]
 __se_sys_close_range fs/open.c:1589 [inline]
 __x64_sys_close_range+0x7a/0x90 fs/open.c:1589
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6b69f7def9
RSP: 002b:00007f6b6a25fb88 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: ffffffffffffffda RBX: 00007f6b6a137a80 RCX: 00007f6b69f7def9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f6b6a137a80 R08: 0000000000000006 R09: 00007f6b6a25fe7f
R10: 00000000003ff934 R11: 0000000000000246 R12: 0000000000065b93
R13: 00007f6b6a25fc90 R14: 0000000000000032 R15: ffffffffffffffff
 </TASK>

Showing all locks held in the system:
5 locks held by kworker/0:0/8:
6 locks held by kworker/u8:0/11:
 #0: ffff88801bae5948
 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline]
 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3312
 #1: 
ffffc90000107d00
 (
net_cleanup_work
){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline]
){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3312
 #2: ffffffff8fc7f750 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x16a/0xcc0 net/core/net_namespace.c:594
 #3: 
ffff888034f5d0e8
 (
&dev->mutex
){....}-{3:3}
, at: device_lock include/linux/device.h:1009 [inline]
, at: devl_dev_lock net/devlink/devl_internal.h:108 [inline]
, at: devlink_pernet_pre_exit+0x13b/0x440 net/devlink/core.c:506
 #4: ffff888034f59250 (&devlink->lock_key
#21){+.+.}-{3:3}, at: devl_lock net/devlink/core.c:276 [inline]
#21){+.+.}-{3:3}, at: devl_dev_lock net/devlink/devl_internal.h:109 [inline]
#21){+.+.}-{3:3}, at: devlink_pernet_pre_exit+0x14d/0x440 net/devlink/core.c:506
 #5: ffffffff8fc8c308 (rtnl_mutex){+.+.}-{3:3}, at: nsim_destroy+0x71/0x5c0 drivers/net/netdevsim/netdev.c:773
1 lock held by khungtaskd/30:
 #0: 
ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline]
ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6626
3 locks held by kworker/u8:2/35:
 #0: ffff88801ac89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline]
 #0: ffff88801ac89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3312
 #1: 
ffffc90000ab7d00
 (
(linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline]
(linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3312
 #2: ffffffff8fc8c308 (rtnl_mutex){+.+.}-{3:3}
, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:276
3 locks held by kworker/0:2/58:
3 locks held by kworker/u8:6/1070:
 #0: ffff88802f963148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline]
 #0: ffff88802f963148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3312
 #1: ffffc900040d7d00 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline]
 #1: ffffc900040d7d00 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3312
 #2: ffffffff8fc8c308 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0x19/0x30 net/ipv6/addrconf.c:4734
5 locks held by kworker/u8:9/2559:
2 locks held by getty/4989:
 #0: ffff88802fffe0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002f162f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6ac/0x1e00 drivers/tty/n_tty.c:2211
8 locks held by kworker/0:3/5299:
4 locks held by kworker/0:7/5350:
4 locks held by udevd/6568:
 #0: ffff88807b8e61c8 (&p->lock){+.+.}-{3:3}, at: seq_read_iter+0xb7/0xd60 fs/seq_file.c:182
 #1: ffff888028c0f088 (&of->mutex#2){+.+.}-{3:3}
, at: kernfs_seq_start+0x53/0x3b0 fs/kernfs/file.c:154
 #2: 
ffff888032ebac38
 (kn->active#18){++++}-{0:0}, at: kernfs_seq_start+0x72/0x3b0 fs/kernfs/file.c:155
 #3: ffff88806f88a190 (&dev->mutex){....}-{3:3}, at: device_lock_interruptible include/linux/device.h:1014 [inline]
 #3: ffff88806f88a190 (&dev->mutex){....}-{3:3}, at: manufacturer_show+0x26/0xa0 drivers/usb/core/sysfs.c:142
1 lock held by syz-executor/12907:
 #0: ffffffff8fc8c308 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
 #0: ffffffff8fc8c308 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6e6/0xcf0 net/core/rtnetlink.c:6644
1 lock held by syz-executor/12916:
 #0: ffffffff8fc8c308 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
 #0: ffffffff8fc8c308 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6e6/0xcf0 net/core/rtnetlink.c:6644
2 locks held by syz-executor/12919:
 #0: ffffffff8fc8c308
 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6e6/0xcf0 net/core/rtnetlink.c:6644
 #1: ffff88801bae6948 (&root->kernfs_rwsem
){++++}-{3:3}, at: kernfs_remove_by_name_ns+0x7a/0x160 fs/kernfs/dir.c:1689
1 lock held by syz-executor/12917:
 #0: 
ffffffff8fc8c308
 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:698 [inline]
 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x3e/0x1b0 drivers/net/tun.c:3510
1 lock held by syz-executor/12918:
 #0: ffffffff8fc8c308 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
 #0: ffffffff8fc8c308 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6e6/0xcf0 net/core/rtnetlink.c:6644
1 lock held by syz-executor/12936:
 #0: 
ffff88801bae6948
 (&root->kernfs_rwsem
){++++}-{3:3}, at: kernfs_dop_revalidate+0xd4/0x560 fs/kernfs/dir.c:1159
2 locks held by syz-executor/12937:
 #0: ffffffff8fc7f750
 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c6/0x7b0 net/core/net_namespace.c:504
 #1: ffffffff8fc8c308 (rtnl_mutex){+.+.}-{3:3}, at: register_nexthop_notifier+0x84/0x290 net/ipv4/nexthop.c:3872
1 lock held by syz-executor/12938:
 #0: 
ffff88801bae6948
 (
&root->kernfs_rwsem
){++++}-{3:3}, at: kernfs_dop_revalidate+0xd4/0x560 fs/kernfs/dir.c:1159
1 lock held by syz-executor/12942:
 #0: ffff88801bae6948 (
&root->kernfs_rwsem){++++}-{3:3}, at: kernfs_dop_revalidate+0xd4/0x560 fs/kernfs/dir.c:1159
2 locks held by syz-executor/12944:
 #0: ffffffff8fc7f750 (pernet_ops_rwsem){++++}-{3:3}
, at: copy_net_ns+0x4c6/0x7b0 net/core/net_namespace.c:504
 #1: 
ffffffff8fc8c308
 (
rtnl_mutex){+.+.}-{3:3}, at: register_nexthop_notifier+0x84/0x290 net/ipv4/nexthop.c:3872
2 locks held by syz-executor/12952:
 #0: 
ffffffff8fc7f750 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c6/0x7b0 net/core/net_namespace.c:504
 #1: ffffffff8fc8c308 (rtnl_mutex){+.+.}-{3:3}
, at: register_nexthop_notifier+0x84/0x290 net/ipv4/nexthop.c:3872

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.11.0-rc7-syzkaller-00151-gd42f7708e27c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:93 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
 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:223 [inline]
 watchdog+0xff4/0x1040 kernel/hung_task.c:379
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5299 Comm: kworker/0:3 Not tainted 6.11.0-rc7-syzkaller-00151-gd42f7708e27c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Workqueue: events kfree_rcu_monitor
RIP: 0010:univ8250_console_write+0x58/0xa0 drivers/tty/serial/8250/8250_core.c:394
Code: 08 84 c0 75 3b 0f b7 6d 00 bf 21 00 00 00 89 ee e8 8d e9 53 fc 83 fd 20 77 3b e8 e3 e5 53 fc 48 0f bf c5 48 69 c0 c0 03 00 00 <48> 8d b8 00 8f 66 9a 48 89 de 44 89 f2 5b 41 5e 5d e9 72 d6 00 00
RSP: 0018:ffffc90000005ce0 EFLAGS: 00000006
RAX: 0000000000000000 RBX: ffffffff9a37be80 RCX: ffff888030491e00
RDX: 0000000000010100 RSI: 0000000000000000 RDI: 0000000000000021
RBP: 0000000000000000 R08: ffffffff853fa6c3 R09: 1ffffffff283c908
R10: dffffc0000000000 R11: ffffffff853fa680 R12: 1ffff92000000bc5
R13: ffffffff8f139020 R14: 0000000000000039 R15: 1ffffffff1cfa0e0
FS:  0000000000000000(0000) GS:ffff8880b8800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3341fffc CR3: 0000000032674000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 00000000000054a1 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 console_emit_next_record kernel/printk/printk.c:2984 [inline]
 console_flush_all+0x865/0xfd0 kernel/printk/printk.c:3050
 console_unlock+0x13b/0x4d0 kernel/printk/printk.c:3119
 vprintk_emit+0x5dc/0x7c0 kernel/printk/printk.c:2348
 dev_vprintk_emit+0x2ae/0x330 drivers/base/core.c:4912
 dev_printk_emit+0xdd/0x120 drivers/base/core.c:4923
 _dev_warn+0x122/0x170 drivers/base/core.c:4979
 usb_rx_callback_intf0+0x15a/0x1a0 drivers/media/rc/imon.c:1768
 __usb_hcd_giveback_urb+0x42c/0x6e0 drivers/usb/core/hcd.c:1650
 dummy_timer+0x830/0x45a0 drivers/usb/gadget/udc/dummy_hcd.c:1987
 __run_hrtimer kernel/time/hrtimer.c:1689 [inline]
 __hrtimer_run_queues+0x59b/0xd50 kernel/time/hrtimer.c:1753
 hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1815
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline]
 __sysvec_apic_timer_interrupt+0x110/0x3f0 arch/x86/kernel/apic/apic.c:1049
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0x52/0xc0 arch/x86/kernel/apic/apic.c:1043
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__is_kernel_text include/asm-generic/sections.h:213 [inline]
RIP: 0010:is_kernel_text include/linux/kallsyms.h:29 [inline]
RIP: 0010:core_kernel_text kernel/extable.c:68 [inline]
RIP: 0010:kernel_text_address+0x17/0xe0 kernel/extable.c:99
Code: 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 55 41 56 53 48 89 fb 48 c7 c0 00 00 00 81 bd 01 00 00 00 <48> 39 c7 72 0c 48 c7 c0 00 00 00 8c 48 39 c3 72 0c 48 89 df e8 70
RSP: 0018:ffffc90000006bc8 EFLAGS: 00000246
RAX: ffffffff81000000 RBX: ffffffff81fa9a1f RCX: ffff888030491e00
RDX: ffff888030491e00 RSI: 0000000000000002 RDI: ffffffff81fa9a1f
RBP: 0000000000000001 R08: ffffffff814125c7 R09: ffffffff814140bf
R10: 0000000000000003 R11: ffff888030491e00 R12: ffff888030491e00
R13: ffffffff817f2f80 R14: dffffc0000000000 R15: 1ffff92000000d8d
 __kernel_text_address+0xd/0x40 kernel/extable.c:79
 unwind_get_return_address+0x5d/0xc0 arch/x86/kernel/unwind_orc.c:369
 arch_stack_walk+0x125/0x1b0 arch/x86/kernel/stacktrace.c:26
 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
 unpoison_slab_object mm/kasan/common.c:312 [inline]
 __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slub.c:3992 [inline]
 slab_alloc_node mm/slub.c:4041 [inline]
 kmem_cache_alloc_node_noprof+0x16b/0x320 mm/slub.c:4084
 kmalloc_reserve+0xa8/0x2a0 net/core/skbuff.c:583
 __alloc_skb+0x1f3/0x440 net/core/skbuff.c:674
 alloc_skb include/linux/skbuff.h:1320 [inline]
 arp_create+0x12d/0x920 net/ipv4/arp.c:561
 arp_send_dst+0xa9/0x340 net/ipv4/arp.c:314
 arp_process+0x15a5/0x1ed0 net/ipv4/arp.c:852
 NF_HOOK+0x3a5/0x450 include/linux/netfilter.h:314
 __netif_receive_skb_list_ptype net/core/dev.c:5709 [inline]
 __netif_receive_skb_list_core+0x8bd/0x980 net/core/dev.c:5752
 __netif_receive_skb_list net/core/dev.c:5804 [inline]
 netif_receive_skb_list_internal+0xa51/0xe30 net/core/dev.c:5896
 gro_normal_list include/net/gro.h:515 [inline]
 napi_complete_done+0x310/0x8e0 net/core/dev.c:6247
 virtqueue_napi_complete drivers/net/virtio_net.c:697 [inline]
 virtnet_poll+0x2dc2/0x3990 drivers/net/virtio_net.c:2825
 __napi_poll+0xcb/0x490 net/core/dev.c:6772
 napi_poll net/core/dev.c:6841 [inline]
 net_rx_action+0x89b/0x1240 net/core/dev.c:6963
 handle_softirqs+0x2c4/0x970 kernel/softirq.c:554
 __do_softirq kernel/softirq.c:588 [inline]
 invoke_softirq kernel/softirq.c:428 [inline]
 __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:649
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1043
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xd8/0x140 kernel/locking/spinlock.c:194
Code: 9c 8f 44 24 20 42 80 3c 23 00 74 08 4c 89 f7 e8 ae 0b 37 f6 f6 44 24 21 02 75 52 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> f3 37 9f f5 65 8b 05 c4 0d 40 74 85 c0 74 43 48 c7 04 24 0e 36
RSP: 0018:ffffc90003acf860 EFLAGS: 00000206
RAX: a853ff4b41193600 RBX: 1ffff92000759f10 RCX: ffffffff81703fea
RDX: dffffc0000000000 RSI: ffffffff8c0ad560 RDI: 0000000000000001
RBP: ffffc90003acf8f0 R08: ffffffff941e488f R09: 1ffffffff283c911
R10: dffffc0000000000 R11: fffffbfff283c912 R12: dffffc0000000000
R13: 1ffff92000759f0c R14: ffffc90003acf880 R15: 0000000000000246
 debug_object_deactivate+0x2d5/0x390 lib/debugobjects.c:779
 debug_rcu_head_unqueue kernel/rcu/rcu.h:239 [inline]
 debug_rcu_bhead_unqueue kernel/rcu/tree.c:3321 [inline]
 kvfree_rcu_bulk+0xd4/0x4e0 kernel/rcu/tree.c:3398
 kvfree_rcu_drain_ready kernel/rcu/tree.c:3579 [inline]
 kfree_rcu_monitor+0x8a4/0x1020 kernel/rcu/tree.c:3597
 process_one_work kernel/workqueue.c:3231 [inline]
 process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312
 worker_thread+0x870/0xd30 kernel/workqueue.c:3393
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored