syzbot

======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Tainted: G             L     
------------------------------------------------------
kworker/1:4/5830 is trying to acquire lock:
ffffffff8e9b18c0 (fs_reclaim){+.+.}-{0:0}, at: might_alloc include/linux/sched/mm.h:317 [inline]
ffffffff8e9b18c0 (fs_reclaim){+.+.}-{0:0}, at: slab_pre_alloc_hook mm/slub.c:4520 [inline]
ffffffff8e9b18c0 (fs_reclaim){+.+.}-{0:0}, at: slab_alloc_node mm/slub.c:4875 [inline]
ffffffff8e9b18c0 (fs_reclaim){+.+.}-{0:0}, at: __kmalloc_cache_noprof+0x4b/0x6f0 mm/slub.c:5414

but task is already holding lock:
ffff88807a999530 (&idev->mc_lock){+.+.}-{4:4}, at: __ipv6_dev_mc_inc+0x53/0xbc0 net/ipv6/mcast.c:943

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #7 (&idev->mc_lock){+.+.}-{4:4}:
       __mutex_lock_common kernel/locking/mutex.c:646 [inline]
       __mutex_lock+0x1a4/0x1b10 kernel/locking/mutex.c:820
       ip6_mc_msfilter+0x1f5/0xf00 net/ipv6/mcast.c:511
       ipv6_set_mcast_msfilter net/ipv6/ipv6_sockglue.c:212 [inline]
       do_ipv6_setsockopt+0xcd9/0x44b0 net/ipv6/ipv6_sockglue.c:918
       ipv6_setsockopt+0xcb/0x170 net/ipv6/ipv6_sockglue.c:965
       udpv6_setsockopt+0x64/0xb0 net/ipv6/udp.c:1823
       do_sock_setsockopt+0xf3/0x1d0 net/socket.c:2381
       __sys_setsockopt+0x195/0x220 net/socket.c:2406
       __do_sys_setsockopt net/socket.c:2412 [inline]
       __se_sys_setsockopt net/socket.c:2409 [inline]
       __x64_sys_setsockopt+0xbd/0x160 net/socket.c:2409
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #6 (sk_lock-AF_INET6){+.+.}-{0:0}:
       lock_sock_nested+0x41/0xf0 net/core/sock.c:3783
       lock_sock include/net/sock.h:1713 [inline]
       inet_shutdown+0x67/0x410 net/ipv4/af_inet.c:915
       nbd_mark_nsock_dead+0xae/0x5c0 drivers/block/nbd.c:318
       sock_shutdown+0x16b/0x200 drivers/block/nbd.c:411
       nbd_clear_sock drivers/block/nbd.c:1427 [inline]
       nbd_config_put+0x1eb/0x750 drivers/block/nbd.c:1451
       nbd_genl_connect+0xaf8/0x1a40 drivers/block/nbd.c:2248
       genl_family_rcv_msg_doit+0x214/0x300 net/netlink/genetlink.c:1114
       genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline]
       genl_rcv_msg+0x560/0x800 net/netlink/genetlink.c:1209
       netlink_rcv_skb+0x159/0x420 net/netlink/af_netlink.c:2550
       genl_rcv+0x28/0x40 net/netlink/genetlink.c:1218
       netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
       netlink_unicast+0x585/0x850 net/netlink/af_netlink.c:1344
       netlink_sendmsg+0x8b0/0xda0 net/netlink/af_netlink.c:1894
       sock_sendmsg_nosec net/socket.c:787 [inline]
       __sock_sendmsg net/socket.c:802 [inline]
       ____sys_sendmsg+0x9e1/0xb70 net/socket.c:2698
       ___sys_sendmsg+0x190/0x1e0 net/socket.c:2752
       __sys_sendmsg+0x170/0x220 net/socket.c:2784
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #5 (&nsock->tx_lock){+.+.}-{4:4}:
       __mutex_lock_common kernel/locking/mutex.c:646 [inline]
       __mutex_lock+0x1a4/0x1b10 kernel/locking/mutex.c:820
       nbd_handle_cmd drivers/block/nbd.c:1143 [inline]
       nbd_queue_rq+0x428/0x1080 drivers/block/nbd.c:1207
       blk_mq_dispatch_rq_list+0x422/0x1e70 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+0xcea/0x1620 block/blk-mq-sched.c:307
       blk_mq_sched_dispatch_requests+0xd7/0x1c0 block/blk-mq-sched.c:329
       blk_mq_run_hw_queue+0x23c/0x670 block/blk-mq.c:2386
       blk_mq_dispatch_list+0x51d/0x1360 block/blk-mq.c:2949
       blk_mq_flush_plug_list block/blk-mq.c:2997 [inline]
       blk_mq_flush_plug_list+0x130/0x600 block/blk-mq.c:2969
       __blk_flush_plug+0x2c4/0x4b0 block/blk-core.c:1230
       blk_finish_plug block/blk-core.c:1257 [inline]
       __submit_bio+0x584/0x6c0 block/blk-core.c:649
       __submit_bio_noacct_mq block/blk-core.c:722 [inline]
       submit_bio_noacct_nocheck+0x543/0xbf0 block/blk-core.c:753
       submit_bio_noacct+0xd18/0x2000 block/blk-core.c:884
       blk_crypto_submit_bio include/linux/blk-crypto.h:203 [inline]
       submit_bh_wbc+0x681/0x890 fs/buffer.c:2737
       submit_bh fs/buffer.c:2742 [inline]
       block_read_full_folio+0x4c8/0x8e0 fs/buffer.c:2358
       filemap_read_folio+0xfc/0x3b0 mm/filemap.c:2502
       do_read_cache_folio+0x2d7/0x6b0 mm/filemap.c:4107
       read_mapping_folio include/linux/pagemap.h:1017 [inline]
       read_part_sector+0xd1/0x370 block/partitions/core.c:724
       adfspart_check_ICS+0x91/0x7d0 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+0x7a3/0x1250 block/partitions/core.c:695
       blkdev_get_whole+0x187/0x290 block/bdev.c:756
       bdev_open+0x2c7/0xe40 block/bdev.c:965
       blkdev_open+0x34e/0x4f0 block/fops.c:697
       do_dentry_open+0x6d8/0x1660 fs/open.c:947
       vfs_open+0x82/0x3f0 fs/open.c:1079
       do_open fs/namei.c:4699 [inline]
       path_openat+0x208c/0x31a0 fs/namei.c:4858
       do_file_open+0x20e/0x430 fs/namei.c:4887
       do_sys_openat2+0x10d/0x1e0 fs/open.c:1364
       do_sys_open fs/open.c:1370 [inline]
       __do_sys_openat fs/open.c:1386 [inline]
       __se_sys_openat fs/open.c:1381 [inline]
       __x64_sys_openat+0x12d/0x210 fs/open.c:1381
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #4 (&cmd->lock){+.+.}-{4:4}:
       __mutex_lock_common kernel/locking/mutex.c:646 [inline]
       __mutex_lock+0x1a4/0x1b10 kernel/locking/mutex.c:820
       nbd_queue_rq+0xba/0x1080 drivers/block/nbd.c:1199
       blk_mq_dispatch_rq_list+0x422/0x1e70 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+0xcea/0x1620 block/blk-mq-sched.c:307
       blk_mq_sched_dispatch_requests+0xd7/0x1c0 block/blk-mq-sched.c:329
       blk_mq_run_hw_queue+0x23c/0x670 block/blk-mq.c:2386
       blk_mq_dispatch_list+0x51d/0x1360 block/blk-mq.c:2949
       blk_mq_flush_plug_list block/blk-mq.c:2997 [inline]
       blk_mq_flush_plug_list+0x130/0x600 block/blk-mq.c:2969
       __blk_flush_plug+0x2c4/0x4b0 block/blk-core.c:1230
       blk_finish_plug block/blk-core.c:1257 [inline]
       __submit_bio+0x584/0x6c0 block/blk-core.c:649
       __submit_bio_noacct_mq block/blk-core.c:722 [inline]
       submit_bio_noacct_nocheck+0x543/0xbf0 block/blk-core.c:753
       submit_bio_noacct+0xd18/0x2000 block/blk-core.c:884
       blk_crypto_submit_bio include/linux/blk-crypto.h:203 [inline]
       submit_bh_wbc+0x681/0x890 fs/buffer.c:2737
       submit_bh fs/buffer.c:2742 [inline]
       block_read_full_folio+0x4c8/0x8e0 fs/buffer.c:2358
       filemap_read_folio+0xfc/0x3b0 mm/filemap.c:2502
       do_read_cache_folio+0x2d7/0x6b0 mm/filemap.c:4107
       read_mapping_folio include/linux/pagemap.h:1017 [inline]
       read_part_sector+0xd1/0x370 block/partitions/core.c:724
       adfspart_check_ICS+0x91/0x7d0 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+0x7a3/0x1250 block/partitions/core.c:695
       blkdev_get_whole+0x187/0x290 block/bdev.c:756
       bdev_open+0x2c7/0xe40 block/bdev.c:965
       blkdev_open+0x34e/0x4f0 block/fops.c:697
       do_dentry_open+0x6d8/0x1660 fs/open.c:947
       vfs_open+0x82/0x3f0 fs/open.c:1079
       do_open fs/namei.c:4699 [inline]
       path_openat+0x208c/0x31a0 fs/namei.c:4858
       do_file_open+0x20e/0x430 fs/namei.c:4887
       do_sys_openat2+0x10d/0x1e0 fs/open.c:1364
       do_sys_open fs/open.c:1370 [inline]
       __do_sys_openat fs/open.c:1386 [inline]
       __se_sys_openat fs/open.c:1381 [inline]
       __x64_sys_openat+0x12d/0x210 fs/open.c:1381
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #3 (set->srcu){.+.+}-{0:0}:
       srcu_lock_sync include/linux/srcu.h:199 [inline]
       __synchronize_srcu+0xa2/0x300 kernel/rcu/srcutree.c:1481
       blk_mq_wait_quiesce_done block/blk-mq.c:284 [inline]
       blk_mq_wait_quiesce_done block/blk-mq.c:281 [inline]
       blk_mq_quiesce_queue block/blk-mq.c:304 [inline]
       blk_mq_quiesce_queue+0x149/0x1c0 block/blk-mq.c:299
       elevator_switch+0x17b/0x7e0 block/elevator.c:576
       elevator_change+0x352/0x530 block/elevator.c:681
       elevator_set_default+0x29e/0x360 block/elevator.c:754
       blk_register_queue+0x48e/0x630 block/blk-sysfs.c:987
       __add_disk+0x73f/0xe40 block/genhd.c:528
       add_disk_fwnode+0x118/0x5c0 block/genhd.c:597
       add_disk include/linux/blkdev.h:794 [inline]
       nbd_dev_add+0x77a/0xb10 drivers/block/nbd.c:1984
       nbd_init+0x291/0x2b0 drivers/block/nbd.c:2692
       do_one_initcall+0x121/0x750 init/main.c:1392
       do_initcall_level init/main.c:1454 [inline]
       do_initcalls init/main.c:1470 [inline]
       do_basic_setup init/main.c:1490 [inline]
       kernel_init_freeable+0x6ea/0x7b0 init/main.c:1703
       kernel_init+0x1f/0x1e0 init/main.c:1593
       ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

-> #2 (&q->elevator_lock){+.+.}-{4:4}:
       __mutex_lock_common kernel/locking/mutex.c:646 [inline]
       __mutex_lock+0x1a4/0x1b10 kernel/locking/mutex.c:820
       elevator_change+0x1bc/0x530 block/elevator.c:679
       elevator_set_none+0x92/0xf0 block/elevator.c:769
       blk_mq_elv_switch_none block/blk-mq.c:5131 [inline]
       __blk_mq_update_nr_hw_queues block/blk-mq.c:5176 [inline]
       blk_mq_update_nr_hw_queues+0x4c1/0x15f0 block/blk-mq.c:5241
       nbd_start_device+0x1a6/0xbd0 drivers/block/nbd.c:1489
       nbd_genl_connect+0xff2/0x1a40 drivers/block/nbd.c:2239
       genl_family_rcv_msg_doit+0x214/0x300 net/netlink/genetlink.c:1114
       genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline]
       genl_rcv_msg+0x560/0x800 net/netlink/genetlink.c:1209
       netlink_rcv_skb+0x159/0x420 net/netlink/af_netlink.c:2550
       genl_rcv+0x28/0x40 net/netlink/genetlink.c:1218
       netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
       netlink_unicast+0x585/0x850 net/netlink/af_netlink.c:1344
       netlink_sendmsg+0x8b0/0xda0 net/netlink/af_netlink.c:1894
       sock_sendmsg_nosec net/socket.c:787 [inline]
       __sock_sendmsg net/socket.c:802 [inline]
       ____sys_sendmsg+0x9e1/0xb70 net/socket.c:2698
       ___sys_sendmsg+0x190/0x1e0 net/socket.c:2752
       __sys_sendmsg+0x170/0x220 net/socket.c:2784
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (&q->q_usage_counter(io)#51){++++}-{0:0}:
       blk_alloc_queue+0x610/0x790 block/blk-core.c:461
       blk_mq_alloc_queue+0x174/0x290 block/blk-mq.c:4450
       __blk_mq_alloc_disk+0x29/0x120 block/blk-mq.c:4497
       nbd_dev_add+0x492/0xb10 drivers/block/nbd.c:1954
       nbd_init+0x291/0x2b0 drivers/block/nbd.c:2692
       do_one_initcall+0x121/0x750 init/main.c:1392
       do_initcall_level init/main.c:1454 [inline]
       do_initcalls init/main.c:1470 [inline]
       do_basic_setup init/main.c:1490 [inline]
       kernel_init_freeable+0x6ea/0x7b0 init/main.c:1703
       kernel_init+0x1f/0x1e0 init/main.c:1593
       ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

-> #0 (fs_reclaim){+.+.}-{0:0}:
       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+0x14b8/0x2630 kernel/locking/lockdep.c:5237
       lock_acquire kernel/locking/lockdep.c:5868 [inline]
       lock_acquire+0x1b1/0x370 kernel/locking/lockdep.c:5825
       __fs_reclaim_acquire mm/page_alloc.c:4325 [inline]
       fs_reclaim_acquire+0xc4/0x100 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]
       __kmalloc_cache_noprof+0x4b/0x6f0 mm/slub.c:5414
       kmalloc_noprof include/linux/slab.h:950 [inline]
       kzalloc_noprof include/linux/slab.h:1188 [inline]
       mca_alloc net/ipv6/mcast.c:871 [inline]
       __ipv6_dev_mc_inc+0x2f1/0xbc0 net/ipv6/mcast.c:961
       ipv6_add_dev+0xb78/0x1520 net/ipv6/addrconf.c:472
       addrconf_notify+0x5db/0x1ba0 net/ipv6/addrconf.c:3662
       notifier_call_chain+0x99/0x400 kernel/notifier.c:85
       call_netdevice_notifiers_info+0xbe/0x110 net/core/dev.c:2249
       call_netdevice_notifiers_extack net/core/dev.c:2287 [inline]
       call_netdevice_notifiers net/core/dev.c:2301 [inline]
       register_netdevice+0x18fe/0x24b0 net/core/dev.c:11458
       register_netdev+0x34/0x50 net/core/dev.c:11536
       usbnet_probe+0x1ab3/0x2770 drivers/net/usb/usbnet.c:1893
       usb_probe_interface+0x303/0x8f0 drivers/usb/core/driver.c:396
       call_driver_probe drivers/base/dd.c:631 [inline]
       really_probe+0x241/0xa60 drivers/base/dd.c:709
       __driver_probe_device+0x22e/0x480 drivers/base/dd.c:871
       driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:901
       __device_attach_driver+0x1df/0x340 drivers/base/dd.c:1029
       bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500
       __device_attach+0x1e4/0x4d0 drivers/base/dd.c:1101
       device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1156
       bus_probe_device+0x64/0x160 drivers/base/bus.c:613
       device_add+0x1210/0x1950 drivers/base/core.c:3706
       usb_set_configuration+0xd97/0x1c60 drivers/usb/core/message.c:2268
       usb_generic_driver_probe+0xa1/0xe0 drivers/usb/core/generic.c:250
       usb_probe_device+0xef/0x400 drivers/usb/core/driver.c:291
       call_driver_probe drivers/base/dd.c:631 [inline]
       really_probe+0x241/0xa60 drivers/base/dd.c:709
       __driver_probe_device+0x22e/0x480 drivers/base/dd.c:871
       driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:901
       __device_attach_driver+0x1df/0x340 drivers/base/dd.c:1029
       bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500
       __device_attach+0x1e4/0x4d0 drivers/base/dd.c:1101
       device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1156
       bus_probe_device+0x64/0x160 drivers/base/bus.c:613
       device_add+0x1210/0x1950 drivers/base/core.c:3706
       usb_new_device.cold+0x685/0x115c drivers/usb/core/hub.c:2695
       hub_port_connect drivers/usb/core/hub.c:5567 [inline]
       hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
       port_event drivers/usb/core/hub.c:5871 [inline]
       hub_event+0x314d/0x4af0 drivers/usb/core/hub.c:5953
       process_one_work+0xa0e/0x1980 kernel/workqueue.c:3302
       process_scheduled_works kernel/workqueue.c:3385 [inline]
       worker_thread+0x5ef/0xe50 kernel/workqueue.c:3466
       kthread+0x370/0x450 kernel/kthread.c:436
       ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

other info that might help us debug this:

Chain exists of:
  fs_reclaim --> sk_lock-AF_INET6 --> &idev->mc_lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&idev->mc_lock);
                               lock(sk_lock-AF_INET6);
                               lock(&idev->mc_lock);
  lock(fs_reclaim);

 *** DEADLOCK ***

7 locks held by kworker/1:4/5830:
 #0: ffff8880232c1540 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x12d6/0x1980 kernel/workqueue.c:3277
 #1: ffffc90004497d08 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x973/0x1980 kernel/workqueue.c:3278
 #2: ffff88802b5d01d8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1040 [inline]
 #2: ffff88802b5d01d8 (&dev->mutex){....}-{4:4}, at: hub_event+0x1bd/0x4af0 drivers/usb/core/hub.c:5899
 #3: ffff8880579ad1d8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1040 [inline]
 #3: ffff8880579ad1d8 (&dev->mutex){....}-{4:4}, at: __device_attach+0x7e/0x4d0 drivers/base/dd.c:1076
 #4: ffff88807b36d1a0 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1040 [inline]
 #4: ffff88807b36d1a0 (&dev->mutex){....}-{4:4}, at: __device_attach+0x7e/0x4d0 drivers/base/dd.c:1076
 #5: ffffffff9060c1a0 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock_killable include/linux/rtnetlink.h:145 [inline]
 #5: ffffffff9060c1a0 (rtnl_mutex){+.+.}-{4:4}, at: register_netdev+0x18/0x50 net/core/dev.c:11533
 #6: ffff88807a999530 (&idev->mc_lock){+.+.}-{4:4}, at: __ipv6_dev_mc_inc+0x53/0xbc0 net/ipv6/mcast.c:943

stack backtrace:
CPU: 1 UID: 0 PID: 5830 Comm: kworker/1:4 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: usb_hub_wq hub_event
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 print_circular_bug.cold+0x178/0x1c7 kernel/locking/lockdep.c:2043
 check_noncircular+0x146/0x160 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+0x14b8/0x2630 kernel/locking/lockdep.c:5237
 lock_acquire kernel/locking/lockdep.c:5868 [inline]
 lock_acquire+0x1b1/0x370 kernel/locking/lockdep.c:5825
 __fs_reclaim_acquire mm/page_alloc.c:4325 [inline]
 fs_reclaim_acquire+0xc4/0x100 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]
 __kmalloc_cache_noprof+0x4b/0x6f0 mm/slub.c:5414
 kmalloc_noprof include/linux/slab.h:950 [inline]
 kzalloc_noprof include/linux/slab.h:1188 [inline]
 mca_alloc net/ipv6/mcast.c:871 [inline]
 __ipv6_dev_mc_inc+0x2f1/0xbc0 net/ipv6/mcast.c:961
 ipv6_add_dev+0xb78/0x1520 net/ipv6/addrconf.c:472
 addrconf_notify+0x5db/0x1ba0 net/ipv6/addrconf.c:3662
 notifier_call_chain+0x99/0x400 kernel/notifier.c:85
 call_netdevice_notifiers_info+0xbe/0x110 net/core/dev.c:2249
 call_netdevice_notifiers_extack net/core/dev.c:2287 [inline]
 call_netdevice_notifiers net/core/dev.c:2301 [inline]
 register_netdevice+0x18fe/0x24b0 net/core/dev.c:11458
 register_netdev+0x34/0x50 net/core/dev.c:11536
 usbnet_probe+0x1ab3/0x2770 drivers/net/usb/usbnet.c:1893
 usb_probe_interface+0x303/0x8f0 drivers/usb/core/driver.c:396
 call_driver_probe drivers/base/dd.c:631 [inline]
 really_probe+0x241/0xa60 drivers/base/dd.c:709
 __driver_probe_device+0x22e/0x480 drivers/base/dd.c:871
 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:901
 __device_attach_driver+0x1df/0x340 drivers/base/dd.c:1029
 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500
 __device_attach+0x1e4/0x4d0 drivers/base/dd.c:1101
 device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1156
 bus_probe_device+0x64/0x160 drivers/base/bus.c:613
 device_add+0x1210/0x1950 drivers/base/core.c:3706
 usb_set_configuration+0xd97/0x1c60 drivers/usb/core/message.c:2268
 usb_generic_driver_probe+0xa1/0xe0 drivers/usb/core/generic.c:250
 usb_probe_device+0xef/0x400 drivers/usb/core/driver.c:291
 call_driver_probe drivers/base/dd.c:631 [inline]
 really_probe+0x241/0xa60 drivers/base/dd.c:709
 __driver_probe_device+0x22e/0x480 drivers/base/dd.c:871
 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:901
 __device_attach_driver+0x1df/0x340 drivers/base/dd.c:1029
 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500
 __device_attach+0x1e4/0x4d0 drivers/base/dd.c:1101
 device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1156
 bus_probe_device+0x64/0x160 drivers/base/bus.c:613
 device_add+0x1210/0x1950 drivers/base/core.c:3706
 usb_new_device.cold+0x685/0x115c drivers/usb/core/hub.c:2695
 hub_port_connect drivers/usb/core/hub.c:5567 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
 port_event drivers/usb/core/hub.c:5871 [inline]
 hub_event+0x314d/0x4af0 drivers/usb/core/hub.c:5953
 process_one_work+0xa0e/0x1980 kernel/workqueue.c:3302
 process_scheduled_works kernel/workqueue.c:3385 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3466
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
sr9700 4-1:0.41 eth5: register 'sr9700' at usb-dummy_hcd.3-1, CoreChip SR9700 USB Ethernet, ca:63:8c:ac:ef:6c
usb 4-1: USB disconnect, device number 65
sr9700 4-1:0.41 eth5: unregister 'sr9700' usb-dummy_hcd.3-1, CoreChip SR9700 USB Ethernet