================================================================== BUG: KASAN: use-after-free in worker_thread+0x9fc/0x11e0 kernel/workqueue.c:2437 Read of size 8 at addr ffff888119030b70 by task kworker/0:4/562 CPU: 0 PID: 562 Comm: kworker/0:4 Not tainted 6.1.141-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: 0x0 (pm) Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:88 dump_stack_lvl+0xee/0x150 lib/dump_stack.c:106 print_address_description+0x71/0x210 mm/kasan/report.c:316 print_report+0x4a/0x60 mm/kasan/report.c:427 kasan_report+0x122/0x150 mm/kasan/report.c:531 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:351 worker_thread+0x9fc/0x11e0 kernel/workqueue.c:2437 kthread+0x281/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Allocated by task 529: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 kasan_save_alloc_info+0x25/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x95/0xb0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:936 [inline] __kmalloc_node+0xb2/0x1e0 mm/slab_common.c:943 kmalloc_node include/linux/slab.h:589 [inline] kvmalloc_node+0x72/0x180 mm/util.c:581 kvmalloc include/linux/slab.h:716 [inline] kvzalloc include/linux/slab.h:724 [inline] alloc_netdev_mqs+0x8d/0xf80 net/core/dev.c:10719 alloc_etherdev_mqs+0x37/0x40 net/ethernet/eth.c:384 usbnet_probe+0x206/0x2770 drivers/net/usb/usbnet.c:1720 usb_probe_interface+0x60a/0xae0 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x2c2/0x950 drivers/base/dd.c:639 __driver_probe_device+0x195/0x280 drivers/base/dd.c:785 driver_probe_device+0x54/0x3e0 drivers/base/dd.c:815 __device_attach_driver+0x2e9/0x4a0 drivers/base/dd.c:943 bus_for_each_drv+0x181/0x210 drivers/base/bus.c:429 __device_attach+0x299/0x3f0 drivers/base/dd.c:1015 device_initial_probe+0x1a/0x20 drivers/base/dd.c:1064 bus_probe_device+0xbd/0x1e0 drivers/base/bus.c:489 device_add+0xb3e/0xee0 drivers/base/core.c:3697 usb_set_configuration+0x19bf/0x1f10 drivers/usb/core/message.c:2165 usb_generic_driver_probe+0x91/0x150 drivers/usb/core/generic.c:238 usb_probe_device+0x153/0x270 drivers/usb/core/driver.c:293 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x2c2/0x950 drivers/base/dd.c:639 __driver_probe_device+0x195/0x280 drivers/base/dd.c:785 driver_probe_device+0x54/0x3e0 drivers/base/dd.c:815 __device_attach_driver+0x2e9/0x4a0 drivers/base/dd.c:943 bus_for_each_drv+0x181/0x210 drivers/base/bus.c:429 __device_attach+0x299/0x3f0 drivers/base/dd.c:1015 device_initial_probe+0x1a/0x20 drivers/base/dd.c:1064 bus_probe_device+0xbd/0x1e0 drivers/base/bus.c:489 device_add+0xb3e/0xee0 drivers/base/core.c:3697 usb_new_device+0xa70/0x1520 drivers/usb/core/hub.c:2631 hub_port_connect drivers/usb/core/hub.c:5489 [inline] hub_port_connect_change drivers/usb/core/hub.c:5629 [inline] port_event drivers/usb/core/hub.c:5785 [inline] hub_event+0x27f3/0x4860 drivers/usb/core/hub.c:5867 process_one_work+0x71f/0xc40 kernel/workqueue.c:2292 worker_thread+0xa26/0x11e0 kernel/workqueue.c:2439 kthread+0x281/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Freed by task 529: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x31/0x50 mm/kasan/generic.c:516 ____kasan_slab_free+0x132/0x180 mm/kasan/common.c:236 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:244 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1750 slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0xb7/0x160 mm/slub.c:3674 kfree+0x6f/0xf0 mm/slab_common.c:988 kvfree+0x35/0x40 mm/util.c:627 netdev_freemem+0x3f/0x60 net/core/dev.c:10673 netdev_release+0x7f/0xb0 net/core/net-sysfs.c:1908 device_release+0xa4/0x1d0 drivers/base/core.c:-1 kobject_cleanup lib/kobject.c:681 [inline] kobject_release lib/kobject.c:712 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x19d/0x280 lib/kobject.c:729 put_device+0x1f/0x30 drivers/base/core.c:3805 free_netdev+0x396/0x490 net/core/dev.c:10866 usbnet_disconnect+0x25a/0x3b0 drivers/net/usb/usbnet.c:1659 usb_unbind_interface+0x21d/0x8c0 drivers/usb/core/driver.c:458 device_remove drivers/base/dd.c:550 [inline] __device_release_driver drivers/base/dd.c:1260 [inline] device_release_driver_internal+0x4fc/0x800 drivers/base/dd.c:1286 device_release_driver+0x19/0x20 drivers/base/dd.c:1309 bus_remove_device+0x2de/0x340 drivers/base/bus.c:531 device_del+0x655/0xe60 drivers/base/core.c:3885 usb_disable_device+0x3a8/0x750 drivers/usb/core/message.c:1414 usb_disconnect+0x31e/0x860 drivers/usb/core/hub.c:2286 hub_port_connect drivers/usb/core/hub.c:5333 [inline] hub_port_connect_change drivers/usb/core/hub.c:5629 [inline] port_event drivers/usb/core/hub.c:5785 [inline] hub_event+0x1a40/0x4860 drivers/usb/core/hub.c:5867 process_one_work+0x71f/0xc40 kernel/workqueue.c:2292 process_scheduled_works kernel/workqueue.c:2355 [inline] worker_thread+0xd2b/0x11e0 kernel/workqueue.c:2441 kthread+0x281/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb6/0xc0 mm/kasan/generic.c:486 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:496 insert_work+0x51/0x300 kernel/workqueue.c:1361 __queue_work+0x9b1/0xd30 kernel/workqueue.c:1520 queue_work_on+0xd2/0x140 kernel/workqueue.c:1548 queue_work include/linux/workqueue.h:512 [inline] schedule_work include/linux/workqueue.h:573 [inline] usbnet_defer_kevent drivers/net/usb/usbnet.c:479 [inline] usbnet_link_change+0x176/0x1a0 drivers/net/usb/usbnet.c:-1 usbnet_probe+0x1d4f/0x2770 drivers/net/usb/usbnet.c:1865 usb_probe_interface+0x60a/0xae0 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x2c2/0x950 drivers/base/dd.c:639 __driver_probe_device+0x195/0x280 drivers/base/dd.c:785 driver_probe_device+0x54/0x3e0 drivers/base/dd.c:815 __device_attach_driver+0x2e9/0x4a0 drivers/base/dd.c:943 bus_for_each_drv+0x181/0x210 drivers/base/bus.c:429 __device_attach+0x299/0x3f0 drivers/base/dd.c:1015 device_initial_probe+0x1a/0x20 drivers/base/dd.c:1064 bus_probe_device+0xbd/0x1e0 drivers/base/bus.c:489 device_add+0xb3e/0xee0 drivers/base/core.c:3697 usb_set_configuration+0x19bf/0x1f10 drivers/usb/core/message.c:2165 usb_generic_driver_probe+0x91/0x150 drivers/usb/core/generic.c:238 usb_probe_device+0x153/0x270 drivers/usb/core/driver.c:293 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x2c2/0x950 drivers/base/dd.c:639 __driver_probe_device+0x195/0x280 drivers/base/dd.c:785 driver_probe_device+0x54/0x3e0 drivers/base/dd.c:815 __device_attach_driver+0x2e9/0x4a0 drivers/base/dd.c:943 bus_for_each_drv+0x181/0x210 drivers/base/bus.c:429 __device_attach+0x299/0x3f0 drivers/base/dd.c:1015 device_initial_probe+0x1a/0x20 drivers/base/dd.c:1064 bus_probe_device+0xbd/0x1e0 drivers/base/bus.c:489 device_add+0xb3e/0xee0 drivers/base/core.c:3697 usb_new_device+0xa70/0x1520 drivers/usb/core/hub.c:2631 hub_port_connect drivers/usb/core/hub.c:5489 [inline] hub_port_connect_change drivers/usb/core/hub.c:5629 [inline] port_event drivers/usb/core/hub.c:5785 [inline] hub_event+0x27f3/0x4860 drivers/usb/core/hub.c:5867 process_one_work+0x71f/0xc40 kernel/workqueue.c:2292 worker_thread+0xa26/0x11e0 kernel/workqueue.c:2439 kthread+0x281/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff888119030000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 2928 bytes inside of 4096-byte region [ffff888119030000, ffff888119031000) The buggy address belongs to the physical page: page:ffffea0004640c00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x119030 head:ffffea0004640c00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100042140 raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 539, tgid 539 (syz-executor), ts 54909348800, free_ts 53412399878 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1d0/0x1f0 mm/page_alloc.c:2532 prep_new_page mm/page_alloc.c:2539 [inline] get_page_from_freelist+0x2e63/0x2ef0 mm/page_alloc.c:4328 __alloc_pages+0x235/0x4b0 mm/page_alloc.c:5614 alloc_slab_page include/linux/gfp.h:-1 [inline] allocate_slab mm/slub.c:1939 [inline] new_slab+0xec/0x4b0 mm/slub.c:1992 ___slab_alloc+0x6f6/0xb50 mm/slub.c:3180 __slab_alloc+0x5e/0xa0 mm/slub.c:3279 slab_alloc_node mm/slub.c:3364 [inline] __kmem_cache_alloc_node+0x1b1/0x260 mm/slub.c:3437 kmalloc_trace+0x29/0xb0 mm/slab_common.c:1026 kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:699 [inline] snmp6_alloc_dev net/ipv6/addrconf.c:354 [inline] ipv6_add_dev+0x614/0x1230 net/ipv6/addrconf.c:404 addrconf_notify+0x6d5/0xe40 net/ipv6/addrconf.c:3601 notifier_call_chain kernel/notifier.c:87 [inline] raw_notifier_call_chain+0xa1/0x110 kernel/notifier.c:455 call_netdevice_notifiers_info net/core/dev.c:2001 [inline] call_netdevice_notifiers_extack net/core/dev.c:2039 [inline] call_netdevice_notifiers+0x111/0x190 net/core/dev.c:2053 register_netdevice+0x1404/0x17d0 net/core/dev.c:10225 macsec_newlink+0x591/0xc70 drivers/net/macsec.c:4087 rtnl_newlink_create net/core/rtnetlink.c:3422 [inline] __rtnl_newlink net/core/rtnetlink.c:3642 [inline] rtnl_newlink+0x14b9/0x2030 net/core/rtnetlink.c:3655 rtnetlink_rcv_msg+0x9f4/0xcf0 net/core/rtnetlink.c:6153 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1459 [inline] free_pcp_prepare mm/page_alloc.c:1532 [inline] free_unref_page_prepare+0x742/0x750 mm/page_alloc.c:3384 free_unref_page+0x33/0x390 mm/page_alloc.c:3479 free_the_page mm/page_alloc.c:754 [inline] __free_pages+0x67/0x100 mm/page_alloc.c:5703 __vunmap+0x9af/0xb70 mm/vmalloc.c:2718 __vfree mm/vmalloc.c:2767 [inline] vfree+0x61/0x90 mm/vmalloc.c:2798 kcov_put kernel/kcov.c:437 [inline] kcov_close+0x2b/0x50 kernel/kcov.c:533 __fput+0x1fc/0x8f0 fs/file_table.c:320 ____fput+0x15/0x20 fs/file_table.c:348 task_work_run+0x1db/0x240 kernel/task_work.c:203 exit_task_work include/linux/task_work.h:39 [inline] do_exit+0x9fb/0x2410 kernel/exit.c:871 do_group_exit+0x210/0x2d0 kernel/exit.c:1021 get_signal+0x13b5/0x1520 kernel/signal.c:2871 arch_do_signal_or_restart+0xb0/0x1030 arch/x86/kernel/signal.c:871 exit_to_user_mode_loop+0x7a/0xb0 kernel/entry/common.c:174 exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline] syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:303 Memory state around the buggy address: ffff888119030a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888119030a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888119030b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888119030b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888119030c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== usb 5-1: new high-speed USB device number 27 using dummy_hcd usb 5-1: config 1 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 0, changing to 7 usb 5-1: config 1 interface 1 altsetting 1 bulk endpoint 0x82 has invalid maxpacket 1024 usb 5-1: New USB device found, idVendor=0525, idProduct=e4a1, bcdDevice= 0.40 usb 5-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 5-1: Product: syz usb 5-1: Manufacturer: syz usb 5-1: SerialNumber: syz cdc_ncm 5-1:1.0: MAC-Address: 42:42:42:42:42:42 cdc_ncm 5-1:1.0: dwNtbInMaxSize=16 is too small. Using 2048 cdc_ncm 5-1:1.0: setting rx_max = 2048 cdc_ncm 5-1:1.0 usb0: register 'cdc_ncm' at usb-dummy_hcd.4-1, CDC NCM (NO ZLP), 42:42:42:42:42:42 usb 5-1: USB disconnect, device number 27 cdc_ncm 5-1:1.0 usb0: unregister 'cdc_ncm' usb-dummy_hcd.4-1, CDC NCM (NO ZLP)