================================================================== BUG: KASAN: use-after-free in __lock_acquire+0xfe/0x6100 kernel/locking/lockdep.c:4885 Read of size 8 at addr ffff88808c48ce28 by task kworker/0:5/9383 CPU: 0 PID: 9383 Comm: kworker/0:5 Not tainted 5.14.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: usb_hub_wq hub_event Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1ae/0x29f lib/dump_stack.c:105 print_address_description+0x66/0x3b0 mm/kasan/report.c:233 __kasan_report mm/kasan/report.c:419 [inline] kasan_report+0x163/0x210 mm/kasan/report.c:436 __lock_acquire+0xfe/0x6100 kernel/locking/lockdep.c:4885 lock_acquire+0x182/0x4a0 kernel/locking/lockdep.c:5625 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline] _raw_spin_lock_irq+0xae/0xf0 kernel/locking/spinlock.c:167 do_wait_for_common+0x2e5/0x480 kernel/sched/completion.c:86 __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x48/0x60 kernel/sched/completion.c:138 r871xu_dev_remove+0x83/0x460 drivers/staging/rtl8712/usb_intf.c:599 usb_unbind_interface+0x1f2/0x860 drivers/usb/core/driver.c:458 __device_release_driver drivers/base/dd.c:1201 [inline] device_release_driver_internal+0x51e/0x7b0 drivers/base/dd.c:1232 bus_remove_device+0x2fd/0x410 drivers/base/bus.c:529 device_del+0x6e1/0xc10 drivers/base/core.c:3542 usb_disable_device+0x407/0x800 drivers/usb/core/message.c:1419 usb_disconnect+0x33a/0x8a0 drivers/usb/core/hub.c:2225 hub_port_connect+0x297/0x27a0 drivers/usb/core/hub.c:5199 hub_port_connect_change+0x5d0/0xbf0 drivers/usb/core/hub.c:5488 port_event+0xaee/0x1140 drivers/usb/core/hub.c:5634 hub_event+0x48d/0xd80 drivers/usb/core/hub.c:5716 process_one_work+0x833/0x10c0 kernel/workqueue.c:2276 worker_thread+0xac1/0x1320 kernel/workqueue.c:2422 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Allocated by task 0: (stack is not available) Freed by task 9651: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x3d/0x70 mm/kasan/common.c:46 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360 ____kasan_slab_free+0x109/0x150 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1625 [inline] slab_free_freelist_hook+0x1d8/0x290 mm/slub.c:1650 slab_free mm/slub.c:3210 [inline] kfree+0xcf/0x2d0 mm/slub.c:4262 skb_free_head net/core/skbuff.c:654 [inline] skb_release_data+0x3c3/0x4f0 net/core/skbuff.c:676 skb_release_all net/core/skbuff.c:741 [inline] __kfree_skb+0x56/0x1d0 net/core/skbuff.c:755 nsim_dev_trap_report drivers/net/netdevsim/dev.c:737 [inline] nsim_dev_trap_report_work+0x7d5/0xb20 drivers/net/netdevsim/dev.c:762 process_one_work+0x833/0x10c0 kernel/workqueue.c:2276 worker_thread+0xac1/0x1320 kernel/workqueue.c:2422 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff88808c48c000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 3624 bytes inside of 4096-byte region [ffff88808c48c000, ffff88808c48d000) The buggy address belongs to the page: page:ffffea0002312200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8c488 head:ffffea0002312200 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000122 ffff888011042140 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 0xd2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 9651, ts 281624921712, free_ts 281624709582 prep_new_page mm/page_alloc.c:2436 [inline] get_page_from_freelist+0x779/0xa30 mm/page_alloc.c:4169 __alloc_pages+0x26c/0x5f0 mm/page_alloc.c:5391 alloc_slab_page mm/slub.c:1688 [inline] allocate_slab+0xf1/0x540 mm/slub.c:1828 new_slab mm/slub.c:1891 [inline] new_slab_objects mm/slub.c:2637 [inline] ___slab_alloc+0x1cf/0x350 mm/slub.c:2800 __slab_alloc mm/slub.c:2840 [inline] slab_alloc_node mm/slub.c:2922 [inline] __kmalloc_node_track_caller+0x2f4/0x410 mm/slub.c:4648 kmalloc_reserve net/core/skbuff.c:355 [inline] __alloc_skb+0x127/0x580 net/core/skbuff.c:426 alloc_skb include/linux/skbuff.h:1112 [inline] nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:664 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:721 [inline] nsim_dev_trap_report_work+0x274/0xb20 drivers/net/netdevsim/dev.c:762 process_one_work+0x833/0x10c0 kernel/workqueue.c:2276 worker_thread+0xac1/0x1320 kernel/workqueue.c:2422 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1346 [inline] free_pcp_prepare+0xc29/0xd20 mm/page_alloc.c:1397 free_unref_page_prepare mm/page_alloc.c:3332 [inline] free_unref_page+0x7e/0x550 mm/page_alloc.c:3411 kfree+0x287/0x2d0 mm/slub.c:4259 request_firmware_work_func+0x175/0x250 drivers/base/firmware_loader/main.c:1081 process_one_work+0x833/0x10c0 kernel/workqueue.c:2276 worker_thread+0xac1/0x1320 kernel/workqueue.c:2422 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Memory state around the buggy address: ffff88808c48cd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808c48cd80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88808c48ce00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88808c48ce80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808c48cf00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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