======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.1.984/8857 is trying to acquire lock:
ffff0000c1920a10 (&root->kernfs_iattr_rwsem){++++}-{4:4}, at: kernfs_link_sibling+0x290/0x370 fs/kernfs/dir.c:411

but task is already holding lock:
ffff0000c1920980 (&root->kernfs_rwsem){++++}-{4:4}, at: kernfs_add_one+0x40/0x398 fs/kernfs/dir.c:825

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #8 (&root->kernfs_rwsem){++++}-{4:4}:
       down_write+0x50/0xc0 kernel/locking/rwsem.c:1631
       kernfs_add_one+0x40/0x398 fs/kernfs/dir.c:825
       kernfs_create_dir_ns+0xe0/0x138 fs/kernfs/dir.c:1130
       sysfs_create_dir_ns+0x120/0x1f4 fs/sysfs/dir.c:59
       create_dir lib/kobject.c:73 [inline]
       kobject_add_internal+0x290/0x6f0 lib/kobject.c:240
       kobject_add_varg+0x9c/0xe8 lib/kobject.c:374
       kobject_add+0x110/0x1c8 lib/kobject.c:426
       device_add+0x394/0x9e0 drivers/base/core.c:3699
       device_register+0x28/0x38 drivers/base/core.c:3858
       register_cpu+0x28c/0x57c drivers/base/cpu.c:431
       arch_register_cpu+0x160/0x224 arch/arm64/kernel/smp.c:532
       acpi_processor_hotadd_init drivers/acpi/acpi_processor.c:248 [inline]
       acpi_processor_get_info drivers/acpi/acpi_processor.c:370 [inline]
       acpi_processor_add+0x8f0/0x13f0 drivers/acpi/acpi_processor.c:441
       acpi_scan_attach_handler drivers/acpi/scan.c:2329 [inline]
       acpi_bus_attach+0x398/0x778 drivers/acpi/scan.c:2378
       acpi_dev_for_one_check+0xa0/0xb4 drivers/acpi/bus.c:1172
       device_for_each_child+0xf4/0x184 drivers/base/core.c:4105
       acpi_dev_for_each_child+0x98/0xe4 drivers/acpi/bus.c:1184
       acpi_bus_attach+0x540/0x778 drivers/acpi/scan.c:2394
       acpi_dev_for_one_check+0xa0/0xb4 drivers/acpi/bus.c:1172
       device_for_each_child+0xf4/0x184 drivers/base/core.c:4105
       acpi_dev_for_each_child+0x98/0xe4 drivers/acpi/bus.c:1184
       acpi_bus_attach+0x540/0x778 drivers/acpi/scan.c:2394
       acpi_bus_scan+0x104/0x310 drivers/acpi/scan.c:2744
       acpi_scan_init+0x168/0x3cc drivers/acpi/scan.c:2870
       acpi_init+0x15c/0x1f4 drivers/acpi/bus.c:1499
       do_one_initcall+0x274/0xc38 init/main.c:1357
       do_initcall_level+0x12c/0x1c4 init/main.c:1419
       do_initcalls+0x70/0xd0 init/main.c:1435
       do_basic_setup+0x7c/0x90 init/main.c:1455
       kernel_init_freeable+0x268/0x3a8 init/main.c:1670
       kernel_init+0x28/0x1e0 init/main.c:1560
       ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:838

-> #7 (cpu_hotplug_lock){++++}-{0:0}:
       percpu_down_read_internal include/linux/percpu-rwsem.h:53 [inline]
       percpu_down_read include/linux/percpu-rwsem.h:77 [inline]
       cpus_read_lock+0x58/0x25c kernel/cpu.c:490
       static_key_slow_inc+0x1c/0x40 kernel/jump_label.c:190
       sk_set_memalloc+0x6c/0xa0 net/core/sock.c:306
       nbd_genl_reconnect_sock_cb+0x32c/0x72c drivers/block/nbd.c:1377
       nbd_genl_foreach_sock+0x204/0x3c8 drivers/block/nbd.c:2152
       nbd_genl_reconfigure+0x714/0x9e8 drivers/block/nbd.c:2477
       genl_family_rcv_msg_doit+0x1e4/0x2d4 net/netlink/genetlink.c:1114
       genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline]
       genl_rcv_msg+0x43c/0x620 net/netlink/genetlink.c:1209
       netlink_rcv_skb+0x238/0x414 net/netlink/af_netlink.c:2556
       genl_rcv+0x38/0x50 net/netlink/genetlink.c:1218
       netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
       netlink_unicast+0x600/0x7f8 net/netlink/af_netlink.c:1345
       netlink_sendmsg+0x648/0x948 net/netlink/af_netlink.c:1900
       sock_sendmsg_nosec net/socket.c:800 [inline]
       __sock_sendmsg+0xc8/0x17c net/socket.c:815
       ____sys_sendmsg+0x3d0/0x6c8 net/socket.c:2713
       ___sys_sendmsg+0x198/0x224 net/socket.c:2767
       __sys_sendmsg+0x158/0x204 net/socket.c:2799
       __do_sys_sendmsg net/socket.c:2804 [inline]
       __se_sys_sendmsg net/socket.c:2802 [inline]
       __arm64_sys_sendmsg+0x88/0x9c net/socket.c:2802
       __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
       invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
       el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
       do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
       el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758
       el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777
       el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590

-> #6 (&nsock->tx_lock){+.+.}-{4:4}:
       __mutex_lock_common kernel/locking/mutex.c:646 [inline]
       __mutex_lock+0x164/0xf14 kernel/locking/mutex.c:821
       mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:874
       nbd_handle_cmd drivers/block/nbd.c:1143 [inline]
       nbd_queue_rq+0x1f4/0xbac drivers/block/nbd.c:1207
       blk_mq_dispatch_rq_list+0x3d4/0x13a8 block/blk-mq.c:2117
       __blk_mq_do_dispatch_sched block/blk-mq-sched.c:168 [inline]
       blk_mq_do_dispatch_sched block/blk-mq-sched.c:182 [inline]
       __blk_mq_sched_dispatch_requests+0xa48/0x10e8 block/blk-mq-sched.c:307
       blk_mq_sched_dispatch_requests+0xa8/0x158 block/blk-mq-sched.c:329
       blk_mq_run_work_fn+0x154/0x2e4 block/blk-mq.c:2532
       process_one_work kernel/workqueue.c:3387 [inline]
       process_scheduled_works+0x91c/0x1250 kernel/workqueue.c:3470
       worker_thread+0x798/0xbd0 kernel/workqueue.c:3551
       kthread+0x304/0x3d4 kernel/kthread.c:436
       ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:838

-> #5 (&cmd->lock){+.+.}-{4:4}:
       __mutex_lock_common kernel/locking/mutex.c:646 [inline]
       __mutex_lock+0x164/0xf14 kernel/locking/mutex.c:821
       mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:874
       nbd_queue_rq+0xb0/0xbac drivers/block/nbd.c:1199
       blk_mq_dispatch_rq_list+0x3d4/0x13a8 block/blk-mq.c:2117
       __blk_mq_do_dispatch_sched block/blk-mq-sched.c:168 [inline]
       blk_mq_do_dispatch_sched block/blk-mq-sched.c:182 [inline]
       __blk_mq_sched_dispatch_requests+0xa48/0x10e8 block/blk-mq-sched.c:307
       blk_mq_sched_dispatch_requests+0xa8/0x158 block/blk-mq-sched.c:329
       blk_mq_run_work_fn+0x154/0x2e4 block/blk-mq.c:2532
       process_one_work kernel/workqueue.c:3387 [inline]
       process_scheduled_works+0x91c/0x1250 kernel/workqueue.c:3470
       worker_thread+0x798/0xbd0 kernel/workqueue.c:3551
       kthread+0x304/0x3d4 kernel/kthread.c:436
       ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:838

-> #4 (set->srcu){.+.+}-{0:0}:
       srcu_lock_sync include/linux/srcu.h:210 [inline]
       __synchronize_srcu+0xc8/0x268 kernel/rcu/srcutree.c:1462
       synchronize_srcu+0x41c/0x5d4 kernel/rcu/srcutree.c:-1
       blk_mq_wait_quiesce_done+0x88/0xac block/blk-mq.c:284
       blk_mq_quiesce_queue+0x70/0x8c block/blk-mq.c:304
       elevator_switch+0x128/0x38c block/elevator.c:576
       elevator_change+0x204/0x35c block/elevator.c:681
       elevator_set_default+0x190/0x2b0 block/elevator.c:754
       blk_register_queue+0x2fc/0x3d4 block/blk-sysfs.c:992
       __add_disk+0x558/0xb44 block/genhd.c:524
       add_disk_fwnode+0xd4/0x340 block/genhd.c:593
       device_add_disk+0x38/0x4c block/genhd.c:623
       add_disk include/linux/blkdev.h:798 [inline]
       nbd_dev_add+0x594/0x884 drivers/block/nbd.c:2026
       nbd_init+0x174/0x19c drivers/block/nbd.c:2743
       do_one_initcall+0x274/0xc38 init/main.c:1357
       do_initcall_level+0x12c/0x1c4 init/main.c:1419
       do_initcalls+0x70/0xd0 init/main.c:1435
       do_basic_setup+0x7c/0x90 init/main.c:1455
       kernel_init_freeable+0x268/0x3a8 init/main.c:1670
       kernel_init+0x28/0x1e0 init/main.c:1560
       ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:838

-> #3 (&q->elevator_lock){+.+.}-{4:4}:
       __mutex_lock_common kernel/locking/mutex.c:646 [inline]
       __mutex_lock+0x164/0xf14 kernel/locking/mutex.c:821
       mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:874
       elevator_change+0x188/0x35c block/elevator.c:679
       elevator_set_none+0xa8/0x13c block/elevator.c:769
       blk_mq_elv_switch_none block/blk-mq.c:5102 [inline]
       __blk_mq_update_nr_hw_queues block/blk-mq.c:5147 [inline]
       blk_mq_update_nr_hw_queues+0x4c4/0x11e0 block/blk-mq.c:5212
       nbd_start_device+0x15c/0xa44 drivers/block/nbd.c:1530
       nbd_genl_connect+0xde4/0x12b0 drivers/block/nbd.c:2310
       genl_family_rcv_msg_doit+0x1e4/0x2d4 net/netlink/genetlink.c:1114
       genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline]
       genl_rcv_msg+0x43c/0x620 net/netlink/genetlink.c:1209
       netlink_rcv_skb+0x238/0x414 net/netlink/af_netlink.c:2556
       genl_rcv+0x38/0x50 net/netlink/genetlink.c:1218
       netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
       netlink_unicast+0x600/0x7f8 net/netlink/af_netlink.c:1345
       netlink_sendmsg+0x648/0x948 net/netlink/af_netlink.c:1900
       sock_sendmsg_nosec net/socket.c:800 [inline]
       __sock_sendmsg+0xc8/0x17c net/socket.c:815
       ____sys_sendmsg+0x3d0/0x6c8 net/socket.c:2713
       ___sys_sendmsg+0x198/0x224 net/socket.c:2767
       __sys_sendmsg+0x158/0x204 net/socket.c:2799
       __do_sys_sendmsg net/socket.c:2804 [inline]
       __se_sys_sendmsg net/socket.c:2802 [inline]
       __arm64_sys_sendmsg+0x88/0x9c net/socket.c:2802
       __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
       invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
       el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
       do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
       el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758
       el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777
       el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590

-> #2 (&q->q_usage_counter(io)#33){++++}-{0:0}:
       blk_alloc_queue+0x488/0x590 block/blk-core.c:504
       blk_mq_alloc_queue+0x148/0x284 block/blk-mq.c:4420
       __blk_mq_alloc_disk+0x38/0x10c block/blk-mq.c:4467
       nbd_dev_add+0x3d0/0x884 drivers/block/nbd.c:1996
       nbd_init+0x174/0x19c drivers/block/nbd.c:2743
       do_one_initcall+0x274/0xc38 init/main.c:1357
       do_initcall_level+0x12c/0x1c4 init/main.c:1419
       do_initcalls+0x70/0xd0 init/main.c:1435
       do_basic_setup+0x7c/0x90 init/main.c:1455
       kernel_init_freeable+0x268/0x3a8 init/main.c:1670
       kernel_init+0x28/0x1e0 init/main.c:1560
       ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:838

-> #1 (fs_reclaim){+.+.}-{0:0}:
       __fs_reclaim_acquire mm/page_alloc.c:4375 [inline]
       fs_reclaim_acquire+0x90/0x110 mm/page_alloc.c:4389
       might_alloc include/linux/sched/mm.h:316 [inline]
       slab_pre_alloc_hook mm/slub.c:4636 [inline]
       slab_alloc_node mm/slub.c:4974 [inline]
       kmem_cache_alloc_noprof+0x60/0x5d4 mm/slub.c:5010
       __kernfs_iattrs+0xd8/0x310 fs/kernfs/inode.c:36
       kernfs_iattrs fs/kernfs/inode.c:60 [inline]
       __kernfs_setattr+0x48/0x2ac fs/kernfs/inode.c:73
       kernfs_iop_setattr+0xc4/0x11c fs/kernfs/inode.c:127
       notify_change+0x928/0xb7c fs/attr.c:556
       do_truncate+0x1a8/0x22c fs/open.c:68
       handle_truncate fs/namei.c:4300 [inline]
       do_open fs/namei.c:4841 [inline]
       path_openat+0x1204/0x18f4 fs/namei.c:5000
       do_file_open+0x1c8/0x2e8 fs/namei.c:5029
       do_sys_openat2+0x114/0x1e8 fs/open.c:1417
       do_sys_open+0xb0/0xe0 fs/open.c:1423
       __do_sys_openat fs/open.c:1439 [inline]
       __se_sys_openat fs/open.c:1434 [inline]
       __arm64_sys_openat+0xa8/0xc4 fs/open.c:1434
       __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
       invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
       el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
       do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
       el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758
       el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777
       el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590

-> #0 (&root->kernfs_iattr_rwsem){++++}-{4:4}:
       check_prev_add kernel/locking/lockdep.c:3181 [inline]
       check_prevs_add kernel/locking/lockdep.c:3300 [inline]
       validate_chain kernel/locking/lockdep.c:3924 [inline]
       __lock_acquire+0x1600/0x2a6c kernel/locking/lockdep.c:5254
       lock_acquire+0x150/0x370 kernel/locking/lockdep.c:5908
       down_write+0x50/0xc0 kernel/locking/rwsem.c:1631
       kernfs_link_sibling+0x290/0x370 fs/kernfs/dir.c:411
       kernfs_add_one+0x1d4/0x398 fs/kernfs/dir.c:844
       kernfs_create_dir_ns+0xe0/0x138 fs/kernfs/dir.c:1130
       sysfs_create_dir_ns+0x120/0x1f4 fs/sysfs/dir.c:59
       create_dir lib/kobject.c:73 [inline]
       kobject_add_internal+0x290/0x6f0 lib/kobject.c:240
       kobject_add_varg+0x9c/0xe8 lib/kobject.c:374
       kobject_add+0x110/0x1c8 lib/kobject.c:426
       device_add+0x394/0x9e0 drivers/base/core.c:3699
       netdev_register_kobject+0x184/0x328 net/core/net-sysfs.c:2340
       register_netdevice+0xd74/0x14c0 net/core/dev.c:11503
       cfg80211_register_netdevice+0x110/0x294 net/wireless/core.c:1693
       ieee80211_if_add+0xd9c/0x12cc net/mac80211/iface.c:2397
       ieee80211_add_iface+0xb0/0x680 net/mac80211/cfg.c:217
       rdev_add_virtual_intf net/wireless/rdev-ops.h:50 [inline]
       _nl80211_new_interface net/wireless/nl80211.c:5177 [inline]
       nl80211_new_interface+0x5fc/0x10c8 net/wireless/nl80211.c:5236
       genl_family_rcv_msg_doit+0x1e4/0x2d4 net/netlink/genetlink.c:1114
       genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline]
       genl_rcv_msg+0x43c/0x620 net/netlink/genetlink.c:1209
       netlink_rcv_skb+0x238/0x414 net/netlink/af_netlink.c:2556
       genl_rcv+0x38/0x50 net/netlink/genetlink.c:1218
       netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
       netlink_unicast+0x600/0x7f8 net/netlink/af_netlink.c:1345
       netlink_sendmsg+0x648/0x948 net/netlink/af_netlink.c:1900
       sock_sendmsg_nosec net/socket.c:800 [inline]
       __sock_sendmsg+0xc8/0x17c net/socket.c:815
       ____sys_sendmsg+0x3d0/0x6c8 net/socket.c:2713
       ___sys_sendmsg+0x198/0x224 net/socket.c:2767
       __sys_sendmsg+0x158/0x204 net/socket.c:2799
       __do_sys_sendmsg net/socket.c:2804 [inline]
       __se_sys_sendmsg net/socket.c:2802 [inline]
       __arm64_sys_sendmsg+0x88/0x9c net/socket.c:2802
       __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
       invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
       el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
       do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
       el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758
       el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777
       el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590

other info that might help us debug this:

Chain exists of:
  &root->kernfs_iattr_rwsem --> cpu_hotplug_lock --> &root->kernfs_rwsem

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&root->kernfs_rwsem);
                               lock(cpu_hotplug_lock);
                               lock(&root->kernfs_rwsem);
  lock(&root->kernfs_iattr_rwsem);

 *** DEADLOCK ***

locks held by syz.1.984/8857: 4, last CPU#1:
 #0: ffff800089f51268 (cb_lock){++++}-{4:4}, at: genl_rcv+0x28/0x50 net/netlink/genetlink.c:1217
 #1: ffff800089ee9d40 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80
 #2: ffff0000f25107a0 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: class_wiphy_constructor include/net/cfg80211.h:6906 [inline]
 #2: ffff0000f25107a0 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: nl80211_new_interface+0xb8/0x10c8 net/wireless/nl80211.c:5234
 #3: ffff0000c1920980 (&root->kernfs_rwsem){++++}-{4:4}, at: kernfs_add_one+0x40/0x398 fs/kernfs/dir.c:825

stack backtrace:
CPU: 1 UID: 0 PID: 8857 Comm: syz.1.984 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 dump_stack+0x1c/0x28 lib/dump_stack.c:129
 print_circular_bug+0x328/0x330 kernel/locking/lockdep.c:2059
 check_noncircular+0x158/0x174 kernel/locking/lockdep.c:2191
 check_prev_add kernel/locking/lockdep.c:3181 [inline]
 check_prevs_add kernel/locking/lockdep.c:3300 [inline]
 validate_chain kernel/locking/lockdep.c:3924 [inline]
 __lock_acquire+0x1600/0x2a6c kernel/locking/lockdep.c:5254
 lock_acquire+0x150/0x370 kernel/locking/lockdep.c:5908
 down_write+0x50/0xc0 kernel/locking/rwsem.c:1631
 kernfs_link_sibling+0x290/0x370 fs/kernfs/dir.c:411
 kernfs_add_one+0x1d4/0x398 fs/kernfs/dir.c:844
 kernfs_create_dir_ns+0xe0/0x138 fs/kernfs/dir.c:1130
 sysfs_create_dir_ns+0x120/0x1f4 fs/sysfs/dir.c:59
 create_dir lib/kobject.c:73 [inline]
 kobject_add_internal+0x290/0x6f0 lib/kobject.c:240
 kobject_add_varg+0x9c/0xe8 lib/kobject.c:374
 kobject_add+0x110/0x1c8 lib/kobject.c:426
 device_add+0x394/0x9e0 drivers/base/core.c:3699
 netdev_register_kobject+0x184/0x328 net/core/net-sysfs.c:2340
 register_netdevice+0xd74/0x14c0 net/core/dev.c:11503
 cfg80211_register_netdevice+0x110/0x294 net/wireless/core.c:1693
 ieee80211_if_add+0xd9c/0x12cc net/mac80211/iface.c:2397
 ieee80211_add_iface+0xb0/0x680 net/mac80211/cfg.c:217
 rdev_add_virtual_intf net/wireless/rdev-ops.h:50 [inline]
 _nl80211_new_interface net/wireless/nl80211.c:5177 [inline]
 nl80211_new_interface+0x5fc/0x10c8 net/wireless/nl80211.c:5236
 genl_family_rcv_msg_doit+0x1e4/0x2d4 net/netlink/genetlink.c:1114
 genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline]
 genl_rcv_msg+0x43c/0x620 net/netlink/genetlink.c:1209
 netlink_rcv_skb+0x238/0x414 net/netlink/af_netlink.c:2556
 genl_rcv+0x38/0x50 net/netlink/genetlink.c:1218
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x600/0x7f8 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x648/0x948 net/netlink/af_netlink.c:1900
 sock_sendmsg_nosec net/socket.c:800 [inline]
 __sock_sendmsg+0xc8/0x17c net/socket.c:815
 ____sys_sendmsg+0x3d0/0x6c8 net/socket.c:2713
 ___sys_sendmsg+0x198/0x224 net/socket.c:2767
 __sys_sendmsg+0x158/0x204 net/socket.c:2799
 __do_sys_sendmsg net/socket.c:2804 [inline]
 __se_sys_sendmsg net/socket.c:2802 [inline]
 __arm64_sys_sendmsg+0x88/0x9c net/socket.c:2802
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758
 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590