netdevsim netdevsim7 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim7 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Tainted: G L ------------------------------------------------------ kworker/u8:3/40 is trying to acquire lock: ffff0000c19192a0 (&root->kernfs_supers_rwsem){++++}-{4:4}, at: kernfs_remove+0x34/0x6c fs/kernfs/dir.c:1623 but task is already holding lock: ffff8000891932c0 (gdp_mutex){+.+.}-{4:4}, at: cleanup_glue_dir+0xbc/0x204 drivers/base/core.c:3365 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #11 (gdp_mutex){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:646 [inline] __mutex_lock+0x160/0xef8 kernel/locking/mutex.c:820 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:873 get_device_parent+0x158/0x34c drivers/base/core.c:3268 device_add+0x294/0x9e4 drivers/base/core.c:3615 device_register+0x28/0x38 drivers/base/core.c:3788 __thermal_cooling_device_register+0x474/0x518 drivers/thermal/thermal_core.c:1120 thermal_cooling_device_register+0x38/0x4c drivers/thermal/thermal_core.c:1162 acpi_processor_thermal_init+0x44/0x204 drivers/acpi/processor_thermal.c:316 __acpi_processor_start drivers/acpi/processor_driver.c:167 [inline] acpi_soft_cpu_online+0x16c/0x2f4 drivers/acpi/processor_driver.c:113 cpuhp_invoke_callback+0x344/0x688 kernel/cpu.c:194 cpuhp_thread_fun+0x2cc/0x5e4 kernel/cpu.c:1109 smpboot_thread_fn+0x498/0x948 kernel/smpboot.c:160 kthread+0x2f8/0x3c8 kernel/kthread.c:436 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:842 -> #10 (cpuhp_state-up){+.+.}-{0:0}: cpuhp_lock_acquire kernel/cpu.c:103 [inline] cpuhp_thread_fun+0x114/0x5e4 kernel/cpu.c:1086 smpboot_thread_fn+0x498/0x948 kernel/smpboot.c:160 kthread+0x2f8/0x3c8 kernel/kthread.c:436 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:842 -> #9 (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 tcp_md5_do_add+0x154/0x2fc net/ipv4/tcp_ipv4.c:1405 tcp_v6_parse_md5_keys+0x514/0x640 net/ipv6/tcp_ipv6.c:-1 do_tcp_setsockopt+0xce8/0x1a18 net/ipv4/tcp.c:4101 tcp_setsockopt+0x68/0xe8 net/ipv4/tcp.c:4187 sock_common_setsockopt+0xb0/0xcc net/core/sock.c:3989 do_sock_setsockopt+0x1f0/0x330 net/socket.c:2381 __sys_setsockopt+0x104/0x170 net/socket.c:2406 __do_sys_setsockopt net/socket.c:2412 [inline] __se_sys_setsockopt net/socket.c:2409 [inline] __arm64_sys_setsockopt+0xb8/0xd4 net/socket.c:2409 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:740 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:759 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 -> #8 (sk_lock-AF_INET6){+.+.}-{0:0}: lock_sock_nested+0x58/0x110 net/core/sock.c:3783 lock_sock include/net/sock.h:1713 [inline] inet_shutdown+0x74/0x34c net/ipv4/af_inet.c:915 kernel_sock_shutdown+0x6c/0x80 net/socket.c:3785 nbd_mark_nsock_dead+0x27c/0x4f4 drivers/block/nbd.c:318 sock_shutdown+0x154/0x23c drivers/block/nbd.c:411 nbd_clear_sock drivers/block/nbd.c:1427 [inline] nbd_config_put+0x274/0x52c drivers/block/nbd.c:1451 nbd_genl_connect+0x1234/0x1564 drivers/block/nbd.c:2248 genl_family_rcv_msg_doit+0x1e4/0x2d8 net/netlink/genetlink.c:1114 genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline] genl_rcv_msg+0x444/0x620 net/netlink/genetlink.c:1209 netlink_rcv_skb+0x22c/0x410 net/netlink/af_netlink.c:2550 genl_rcv+0x38/0x50 net/netlink/genetlink.c:1218 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x610/0x800 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x63c/0x920 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:787 [inline] __sock_sendmsg+0xc8/0x138 net/socket.c:802 ____sys_sendmsg+0x418/0x70c net/socket.c:2698 ___sys_sendmsg+0x198/0x224 net/socket.c:2752 __sys_sendmsg+0x160/0x214 net/socket.c:2784 __do_sys_sendmsg net/socket.c:2789 [inline] __se_sys_sendmsg net/socket.c:2787 [inline] __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2787 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:740 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:759 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 -> #7 (&nsock->tx_lock){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:646 [inline] __mutex_lock+0x160/0xef8 kernel/locking/mutex.c:820 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:873 nbd_handle_cmd drivers/block/nbd.c:1143 [inline] nbd_queue_rq+0x208/0xc44 drivers/block/nbd.c:1207 blk_mq_dispatch_rq_list+0x3bc/0x13a4 block/blk-mq.c:2148 __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+0xa40/0x10bc block/blk-mq-sched.c:307 blk_mq_sched_dispatch_requests+0xa4/0x154 block/blk-mq-sched.c:329 blk_mq_run_hw_queue+0x300/0x4dc block/blk-mq.c:2386 blk_mq_dispatch_list+0xa2c/0xb2c block/blk-mq.c:-1 blk_mq_flush_plug_list+0x3a4/0x484 block/blk-mq.c:2997 __blk_flush_plug+0x338/0x410 block/blk-core.c:1230 blk_finish_plug block/blk-core.c:1257 [inline] __submit_bio+0x39c/0x478 block/blk-core.c:649 __submit_bio_noacct_mq block/blk-core.c:722 [inline] submit_bio_noacct_nocheck+0x284/0xa98 block/blk-core.c:753 submit_bio_noacct+0xd90/0x1814 block/blk-core.c:884 submit_bio+0x38c/0x528 block/blk-core.c:926 blk_crypto_submit_bio include/linux/blk-crypto.h:203 [inline] submit_bh_wbc+0x4b0/0x594 fs/buffer.c:2737 submit_bh fs/buffer.c:2742 [inline] block_read_full_folio+0x468/0x734 fs/buffer.c:2344 blkdev_read_folio+0x28/0x38 block/fops.c:494 filemap_read_folio+0xf0/0x2fc mm/filemap.c:2502 do_read_cache_folio+0x368/0x5b8 mm/filemap.c:4107 read_cache_folio+0x68/0x84 mm/filemap.c:4139 read_mapping_folio include/linux/pagemap.h:1017 [inline] read_part_sector+0xcc/0x708 block/partitions/core.c:724 adfspart_check_ICS+0xa4/0x6fc block/partitions/acorn.c:356 check_partition block/partitions/core.c:143 [inline] blk_add_partitions block/partitions/core.c:591 [inline] bdev_disk_changed+0x6fc/0x11c8 block/partitions/core.c:695 blkdev_get_whole+0x15c/0x240 block/bdev.c:756 bdev_open+0x2d8/0x8cc block/bdev.c:965 blkdev_open+0x2d8/0x404 block/fops.c:697 do_dentry_open+0x5c4/0xfc8 fs/open.c:947 vfs_open+0x44/0x2d4 fs/open.c:1079 do_open fs/namei.c:4699 [inline] path_openat+0x2234/0x2a6c fs/namei.c:4858 do_file_open+0x1c4/0x2e4 fs/namei.c:4887 do_sys_openat2+0x114/0x1e8 fs/open.c:1364 do_sys_open+0xac/0xdc fs/open.c:1370 __do_sys_openat fs/open.c:1386 [inline] __se_sys_openat fs/open.c:1381 [inline] __arm64_sys_openat+0x9c/0xb8 fs/open.c:1381 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:740 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:759 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 -> #6 (&cmd->lock){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:646 [inline] __mutex_lock+0x160/0xef8 kernel/locking/mutex.c:820 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:873 nbd_queue_rq+0xb0/0xc44 drivers/block/nbd.c:1199 blk_mq_dispatch_rq_list+0x3bc/0x13a4 block/blk-mq.c:2148 __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+0xa40/0x10bc block/blk-mq-sched.c:307 blk_mq_sched_dispatch_requests+0xa4/0x154 block/blk-mq-sched.c:329 blk_mq_run_hw_queue+0x300/0x4dc block/blk-mq.c:2386 blk_mq_dispatch_list+0xa2c/0xb2c block/blk-mq.c:-1 blk_mq_flush_plug_list+0x3a4/0x484 block/blk-mq.c:2997 __blk_flush_plug+0x338/0x410 block/blk-core.c:1230 blk_finish_plug block/blk-core.c:1257 [inline] __submit_bio+0x39c/0x478 block/blk-core.c:649 __submit_bio_noacct_mq block/blk-core.c:722 [inline] submit_bio_noacct_nocheck+0x284/0xa98 block/blk-core.c:753 submit_bio_noacct+0xd90/0x1814 block/blk-core.c:884 submit_bio+0x38c/0x528 block/blk-core.c:926 blk_crypto_submit_bio include/linux/blk-crypto.h:203 [inline] submit_bh_wbc+0x4b0/0x594 fs/buffer.c:2737 submit_bh fs/buffer.c:2742 [inline] block_read_full_folio+0x468/0x734 fs/buffer.c:2344 blkdev_read_folio+0x28/0x38 block/fops.c:494 filemap_read_folio+0xf0/0x2fc mm/filemap.c:2502 do_read_cache_folio+0x368/0x5b8 mm/filemap.c:4107 read_cache_folio+0x68/0x84 mm/filemap.c:4139 read_mapping_folio include/linux/pagemap.h:1017 [inline] read_part_sector+0xcc/0x708 block/partitions/core.c:724 adfspart_check_ICS+0xa4/0x6fc block/partitions/acorn.c:356 check_partition block/partitions/core.c:143 [inline] blk_add_partitions block/partitions/core.c:591 [inline] bdev_disk_changed+0x6fc/0x11c8 block/partitions/core.c:695 blkdev_get_whole+0x15c/0x240 block/bdev.c:756 bdev_open+0x2d8/0x8cc block/bdev.c:965 blkdev_open+0x2d8/0x404 block/fops.c:697 do_dentry_open+0x5c4/0xfc8 fs/open.c:947 vfs_open+0x44/0x2d4 fs/open.c:1079 do_open fs/namei.c:4699 [inline] path_openat+0x2234/0x2a6c fs/namei.c:4858 do_file_open+0x1c4/0x2e4 fs/namei.c:4887 do_sys_openat2+0x114/0x1e8 fs/open.c:1364 do_sys_open+0xac/0xdc fs/open.c:1370 __do_sys_openat fs/open.c:1386 [inline] __se_sys_openat fs/open.c:1381 [inline] __arm64_sys_openat+0x9c/0xb8 fs/open.c:1381 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:740 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:759 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 -> #5 (set->srcu){.+.+}-{0:0}: srcu_lock_sync include/linux/srcu.h:199 [inline] __synchronize_srcu+0xc8/0x268 kernel/rcu/srcutree.c:1481 synchronize_srcu+0x41c/0x604 kernel/rcu/srcutree.c:-1 blk_mq_wait_quiesce_done+0x88/0xb0 block/blk-mq.c:284 blk_mq_quiesce_queue+0x70/0x8c block/blk-mq.c:304 elevator_switch+0x128/0x384 block/elevator.c:576 elevator_change+0x200/0x358 block/elevator.c:681 elevator_set_default+0x190/0x2b0 block/elevator.c:754 blk_register_queue+0x2f8/0x3d0 block/blk-sysfs.c:987 __add_disk+0x568/0xb3c block/genhd.c:528 add_disk_fwnode+0xe8/0x42c block/genhd.c:597 device_add_disk+0x38/0x4c block/genhd.c:627 add_disk include/linux/blkdev.h:794 [inline] nbd_dev_add+0x588/0x85c drivers/block/nbd.c:1984 nbd_init+0x15c/0x174 drivers/block/nbd.c:2692 do_one_initcall+0x274/0xc20 init/main.c:1392 do_initcall_level+0x128/0x1c4 init/main.c:1454 do_initcalls+0x70/0xd0 init/main.c:1470 do_basic_setup+0x7c/0x90 init/main.c:1490 kernel_init_freeable+0x268/0x3a8 init/main.c:1703 kernel_init+0x24/0x1dc init/main.c:1593 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:842 -> #4 (&q->elevator_lock){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:646 [inline] __mutex_lock+0x160/0xef8 kernel/locking/mutex.c:820 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:873 elevator_change+0x184/0x358 block/elevator.c:679 elevator_set_none+0xa8/0x13c block/elevator.c:769 blk_mq_elv_switch_none block/blk-mq.c:5150 [inline] __blk_mq_update_nr_hw_queues block/blk-mq.c:5195 [inline] blk_mq_update_nr_hw_queues+0x4ec/0x11fc block/blk-mq.c:5260 nbd_start_device+0x15c/0xa38 drivers/block/nbd.c:1489 nbd_genl_connect+0xfac/0x1564 drivers/block/nbd.c:2239 genl_family_rcv_msg_doit+0x1e4/0x2d8 net/netlink/genetlink.c:1114 genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline] genl_rcv_msg+0x444/0x620 net/netlink/genetlink.c:1209 netlink_rcv_skb+0x22c/0x410 net/netlink/af_netlink.c:2550 genl_rcv+0x38/0x50 net/netlink/genetlink.c:1218 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x610/0x800 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x63c/0x920 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:787 [inline] __sock_sendmsg+0xc8/0x138 net/socket.c:802 ____sys_sendmsg+0x418/0x70c net/socket.c:2698 ___sys_sendmsg+0x198/0x224 net/socket.c:2752 __sys_sendmsg+0x160/0x214 net/socket.c:2784 __do_sys_sendmsg net/socket.c:2789 [inline] __se_sys_sendmsg net/socket.c:2787 [inline] __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2787 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:740 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:759 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 -> #3 (&q->q_usage_counter(io)#35){++++}-{0:0}: blk_alloc_queue+0x47c/0x57c block/blk-core.c:461 blk_mq_alloc_queue+0x148/0x294 block/blk-mq.c:4469 __blk_mq_alloc_disk+0x38/0x10c block/blk-mq.c:4516 nbd_dev_add+0x3c0/0x85c drivers/block/nbd.c:1954 nbd_init+0x15c/0x174 drivers/block/nbd.c:2692 do_one_initcall+0x274/0xc20 init/main.c:1392 do_initcall_level+0x128/0x1c4 init/main.c:1454 do_initcalls+0x70/0xd0 init/main.c:1470 do_basic_setup+0x7c/0x90 init/main.c:1490 kernel_init_freeable+0x268/0x3a8 init/main.c:1703 kernel_init+0x24/0x1dc init/main.c:1593 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:842 -> #2 (fs_reclaim){+.+.}-{0:0}: __fs_reclaim_acquire mm/page_alloc.c:4325 [inline] fs_reclaim_acquire+0x90/0x110 mm/page_alloc.c:4339 might_alloc include/linux/sched/mm.h:317 [inline] slab_pre_alloc_hook mm/slub.c:4520 [inline] slab_alloc_node mm/slub.c:4875 [inline] kmem_cache_alloc_lru_noprof+0x60/0x618 mm/slub.c:4917 alloc_inode+0x84/0x198 fs/inode.c:347 iget_locked+0xd8/0x374 fs/inode.c:1474 kernfs_get_inode+0x54/0x378 fs/kernfs/inode.c:252 kernfs_fill_super fs/kernfs/mount.c:308 [inline] kernfs_get_tree+0x4b0/0x7a0 fs/kernfs/mount.c:392 sysfs_get_tree+0x48/0x120 fs/sysfs/mount.c:31 vfs_get_tree+0x90/0x28c fs/super.c:1754 fc_mount+0x24/0xac fs/namespace.c:1193 do_new_mount_fc fs/namespace.c:3758 [inline] do_new_mount+0x2a4/0x540 fs/namespace.c:3834 path_mount+0x5d0/0xa68 fs/namespace.c:4154 do_mount+0xe8/0x148 fs/namespace.c:4167 __do_sys_mount fs/namespace.c:4383 [inline] __se_sys_mount fs/namespace.c:4360 [inline] __arm64_sys_mount+0x334/0x380 fs/namespace.c:4360 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:740 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:759 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 -> #1 (&root->kernfs_rwsem){++++}-{4:4}: down_write+0x50/0xc0 kernel/locking/rwsem.c:1625 kernfs_remove_by_name_ns+0x44/0xd0 fs/kernfs/dir.c:1793 sysfs_remove_file_ns+0x6c/0x80 fs/sysfs/file.c:512 sysfs_remove_file include/linux/sysfs.h:780 [inline] device_remove_file drivers/base/core.c:3072 [inline] device_links_driver_bound+0x134/0x7b0 drivers/base/core.c:1326 driver_bound+0xd8/0x1bc drivers/base/dd.c:458 really_probe+0x520/0x7e8 drivers/base/dd.c:759 __driver_probe_device+0x1e0/0x33c drivers/base/dd.c:871 driver_probe_device+0x6c/0x19c drivers/base/dd.c:901 __device_attach_driver+0x194/0x2f4 drivers/base/dd.c:1029 bus_for_each_drv+0x144/0x1dc drivers/base/bus.c:500 __device_attach+0x250/0x394 drivers/base/dd.c:1101 device_initial_probe+0x90/0xcc drivers/base/dd.c:1156 bus_probe_device+0x58/0x120 drivers/base/bus.c:613 device_add+0x6c4/0x9e4 drivers/base/core.c:3706 faux_device_create_with_groups+0x178/0x284 drivers/base/faux.c:158 faux_device_create+0x38/0x4c drivers/base/faux.c:208 regulator_dummy_init+0x24/0x4c drivers/regulator/dummy.c:67 regulator_init+0xe8/0x128 drivers/regulator/core.c:6772 do_one_initcall+0x274/0xc20 init/main.c:1392 do_initcall_level+0x128/0x1c4 init/main.c:1454 do_initcalls+0x70/0xd0 init/main.c:1470 do_basic_setup+0x7c/0x90 init/main.c:1490 kernel_init_freeable+0x268/0x3a8 init/main.c:1703 kernel_init+0x24/0x1dc init/main.c:1593 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:842 -> #0 (&root->kernfs_supers_rwsem){++++}-{4:4}: check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x1780/0x2f44 kernel/locking/lockdep.c:5237 lock_acquire+0x140/0x368 kernel/locking/lockdep.c:5868 down_read+0x58/0x2bc kernel/locking/rwsem.c:1568 kernfs_remove+0x34/0x6c fs/kernfs/dir.c:1623 sysfs_remove_dir+0xa8/0xec fs/sysfs/dir.c:101 __kobject_del+0xe0/0x1c4 lib/kobject.c:604 kobject_del+0x48/0x68 lib/kobject.c:627 cleanup_glue_dir+0x18c/0x204 drivers/base/core.c:3416 device_del+0x620/0x710 drivers/base/core.c:3916 netdev_unregister_kobject+0x2b4/0x3ac net/core/net-sysfs.c:2314 unregister_netdevice_many_notify+0x13c0/0x18d8 net/core/dev.c:12456 unregister_netdevice_many net/core/dev.c:12484 [inline] unregister_netdevice_queue+0x270/0x308 net/core/dev.c:12294 unregister_netdevice include/linux/netdevice.h:3444 [inline] nsim_destroy+0x234/0x5ec drivers/net/netdevsim/netdev.c:1193 __nsim_dev_port_del+0x134/0x1e4 drivers/net/netdevsim/dev.c:1547 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1561 [inline] nsim_dev_reload_destroy+0x138/0x208 drivers/net/netdevsim/dev.c:1785 nsim_dev_reload_down+0x9c/0xd4 drivers/net/netdevsim/dev.c:1038 devlink_reload+0x194/0x648 net/devlink/dev.c:462 devlink_pernet_pre_exit+0x1a0/0x30c net/devlink/core.c:558 ops_pre_exit_list net/core/net_namespace.c:161 [inline] ops_undo_list+0x154/0x818 net/core/net_namespace.c:234 cleanup_net+0x470/0x6b8 net/core/net_namespace.c:702 process_one_work kernel/workqueue.c:3314 [inline] process_scheduled_works+0x79c/0x1098 kernel/workqueue.c:3397 worker_thread+0x754/0xba0 kernel/workqueue.c:3478 kthread+0x2f8/0x3c8 kernel/kthread.c:436 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:842 other info that might help us debug this: Chain exists of: &root->kernfs_supers_rwsem --> cpuhp_state-up --> gdp_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(gdp_mutex); lock(cpuhp_state-up); lock(gdp_mutex); rlock(&root->kernfs_supers_rwsem); *** DEADLOCK *** 7 locks held by kworker/u8:3/40: #0: ffff0000c004e140 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3289 [inline] #0: ffff0000c004e140 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x748/0x1098 kernel/workqueue.c:3397 #1: ffff800090007c40 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3289 [inline] #1: ffff800090007c40 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x750/0x1098 kernel/workqueue.c:3397 #2: ffff800089c2e6a8 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0x100/0x6b8 net/core/net_namespace.c:673 #3: ffff0000d8946128 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1040 [inline] #3: ffff0000d8946128 (&dev->mutex){....}-{4:4}, at: devl_dev_lock net/devlink/devl_internal.h:124 [inline] #3: ffff0000d8946128 (&dev->mutex){....}-{4:4}, at: devlink_pernet_pre_exit+0xfc/0x30c net/devlink/core.c:555 #4: ffff0000d390d258 (&devlink->lock_key#8){+.+.}-{4:4}, at: devl_lock net/devlink/core.c:292 [inline] #4: ffff0000d390d258 (&devlink->lock_key#8){+.+.}-{4:4}, at: devl_dev_lock net/devlink/devl_internal.h:125 [inline] #4: ffff0000d390d258 (&devlink->lock_key#8){+.+.}-{4:4}, at: devlink_pernet_pre_exit+0x110/0x30c net/devlink/core.c:555 #5: ffff800089c3bb80 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 #6: ffff8000891932c0 (gdp_mutex){+.+.}-{4:4}, at: cleanup_glue_dir+0xbc/0x204 drivers/base/core.c:3365 stack backtrace: CPU: 1 UID: 0 PID: 40 Comm: kworker/u8:3 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Workqueue: netns cleanup_net 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:2043 check_noncircular+0x158/0x174 kernel/locking/lockdep.c:2175 check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x1780/0x2f44 kernel/locking/lockdep.c:5237 lock_acquire+0x140/0x368 kernel/locking/lockdep.c:5868 down_read+0x58/0x2bc kernel/locking/rwsem.c:1568 kernfs_remove+0x34/0x6c fs/kernfs/dir.c:1623 sysfs_remove_dir+0xa8/0xec fs/sysfs/dir.c:101 __kobject_del+0xe0/0x1c4 lib/kobject.c:604 kobject_del+0x48/0x68 lib/kobject.c:627 cleanup_glue_dir+0x18c/0x204 drivers/base/core.c:3416 device_del+0x620/0x710 drivers/base/core.c:3916 netdev_unregister_kobject+0x2b4/0x3ac net/core/net-sysfs.c:2314 unregister_netdevice_many_notify+0x13c0/0x18d8 net/core/dev.c:12456 unregister_netdevice_many net/core/dev.c:12484 [inline] unregister_netdevice_queue+0x270/0x308 net/core/dev.c:12294 unregister_netdevice include/linux/netdevice.h:3444 [inline] nsim_destroy+0x234/0x5ec drivers/net/netdevsim/netdev.c:1193 __nsim_dev_port_del+0x134/0x1e4 drivers/net/netdevsim/dev.c:1547 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1561 [inline] nsim_dev_reload_destroy+0x138/0x208 drivers/net/netdevsim/dev.c:1785 nsim_dev_reload_down+0x9c/0xd4 drivers/net/netdevsim/dev.c:1038 devlink_reload+0x194/0x648 net/devlink/dev.c:462 devlink_pernet_pre_exit+0x1a0/0x30c net/devlink/core.c:558 ops_pre_exit_list net/core/net_namespace.c:161 [inline] ops_undo_list+0x154/0x818 net/core/net_namespace.c:234 cleanup_net+0x470/0x6b8 net/core/net_namespace.c:702 process_one_work kernel/workqueue.c:3314 [inline] process_scheduled_works+0x79c/0x1098 kernel/workqueue.c:3397 worker_thread+0x754/0xba0 kernel/workqueue.c:3478 kthread+0x2f8/0x3c8 kernel/kthread.c:436 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:842 bridge_slave_1: left allmulticast mode bridge_slave_1: left promiscuous mode bridge0: port 2(bridge_slave_1) entered disabled state bridge_slave_0: left allmulticast mode bridge_slave_0: left promiscuous mode bridge0: port 1(bridge_slave_0) entered disabled state bond0 (unregistering): (slave bond_slave_0): Releasing backup interface bond0 (unregistering): (slave bond_slave_1): Releasing backup interface bond0 (unregistering): Released all slaves tipc: Left network mode hsr_slave_0: left promiscuous mode hsr_slave_1: left promiscuous mode batman_adv: batadv0: Interface deactivated: batadv_slave_0 batman_adv: batadv0: Removing interface: batadv_slave_0 batman_adv: batadv0: Interface deactivated: batadv_slave_1 batman_adv: batadv0: Removing interface: batadv_slave_1 veth1_macvtap: left promiscuous mode veth0_macvtap: left promiscuous mode veth1_vlan: left promiscuous mode veth0_vlan: left promiscuous mode team0 (unregistering): Port device team_slave_1 removed team0 (unregistering): Port device team_slave_0 removed IPVS: stop unused estimator thread 0... netdevsim netdevsim9 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim9 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim9 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim9 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim8 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim8 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim8 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim8 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim5 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim5 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim5 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 netdevsim netdevsim5 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 bridge_slave_1: left allmulticast mode bridge_slave_1: left promiscuous mode bridge0: port 2(bridge_slave_1) entered disabled state bridge_slave_0: left allmulticast mode bridge_slave_0: left promiscuous mode bridge0: port 1(bridge_slave_0) entered disabled state bridge_slave_1: left allmulticast mode bridge_slave_1: left promiscuous mode bridge0: port 2(bridge_slave_1) entered disabled state bridge_slave_0: left allmulticast mode bridge_slave_0: left promiscuous mode bridge0: port 1(bridge_slave_0) entered disabled state bridge_slave_1: left allmulticast mode bridge_slave_1: left promiscuous mode bridge0: port 2(bridge_slave_1) entered disabled state bridge_slave_0: left allmulticast mode bridge_slave_0: left promiscuous mode bridge0: port 1(bridge_slave_0) entered disabled state bond0 (unregistering): (slave bond_slave_0): Releasing backup interface bond0 (unregistering): (slave bond_slave_1): Releasing backup interface bond0 (unregistering): Released all slaves bond0 (unregistering): (slave bond_slave_0): Releasing backup interface bond0 (unregistering): (slave bond_slave_1): Releasing backup interface bond0 (unregistering): Released all slaves bond0 (unregistering): (slave bond_slave_0): Releasing backup interface bond0 (unregistering): (slave bond_slave_1): Releasing backup interface bond0 (unregistering): Released all slaves hsr_slave_0: left promiscuous mode hsr_slave_1: left promiscuous mode batman_adv: batadv0: Interface deactivated: batadv_slave_0 batman_adv: batadv0: Removing interface: batadv_slave_0 batman_adv: batadv0: Interface deactivated: batadv_slave_1 batman_adv: batadv0: Removing interface: batadv_slave_1 hsr_slave_0: left promiscuous mode hsr_slave_1: left promiscuous mode batman_adv: batadv0: Interface deactivated: batadv_slave_0 batman_adv: batadv0: Removing interface: batadv_slave_0 batman_adv: batadv0: Interface deactivated: batadv_slave_1 batman_adv: batadv0: Removing interface: batadv_slave_1 hsr_slave_0: left promiscuous mode hsr_slave_1: left promiscuous mode batman_adv: batadv0: Interface deactivated: batadv_slave_0 batman_adv: batadv0: Removing interface: batadv_slave_0 batman_adv: batadv0: Interface deactivated: batadv_slave_1 batman_adv: batadv0: Removing interface: batadv_slave_1 veth1_macvtap: left promiscuous mode veth0_macvtap: left promiscuous mode veth1_vlan: left promiscuous mode veth0_vlan: left promiscuous mode veth1_macvtap: left promiscuous mode veth0_macvtap: left promiscuous mode veth1_vlan: left promiscuous mode veth0_vlan: left promiscuous mode veth1_macvtap: left promiscuous mode veth0_macvtap: left promiscuous mode veth1_vlan: left promiscuous mode veth0_vlan: left promiscuous mode team0 (unregistering): Port device team_slave_1 removed team0 (unregistering): Port device team_slave_0 removed team0 (unregistering): Port device team_slave_1 removed team0 (unregistering): Port device team_slave_0 removed team0 (unregistering): Port device team_slave_1 removed team0 (unregistering): Port device team_slave_0 removed dummy0 (unregistering): left allmulticast mode IPVS: stop unused estimator thread 0...