usb 2-1: USB disconnect, device number 47 ================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x3d86/0x54a0 kernel/locking/lockdep.c:4885 Read of size 8 at addr ffff88811f5ecda8 by task kworker/1:9/11509 CPU: 1 PID: 11509 Comm: kworker/1:9 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+0xcd/0x134 lib/dump_stack.c:105 print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:233 __kasan_report mm/kasan/report.c:419 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:436 __lock_acquire+0x3d86/0x54a0 kernel/locking/lockdep.c:4885 lock_acquire kernel/locking/lockdep.c:5625 [inline] lock_acquire+0x19d/0x4d0 kernel/locking/lockdep.c:5590 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline] _raw_spin_lock_irq+0x2f/0x40 kernel/locking/spinlock.c:167 do_wait_for_common kernel/sched/completion.c:86 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x181/0x280 kernel/sched/completion.c:138 r871xu_dev_remove+0x80/0x320 drivers/staging/rtl8712/usb_intf.c:599 usb_unbind_interface+0x1d8/0x8d0 drivers/usb/core/driver.c:458 __device_release_driver+0x3bd/0x6f0 drivers/base/dd.c:1201 device_release_driver_internal drivers/base/dd.c:1232 [inline] device_release_driver+0x26/0x40 drivers/base/dd.c:1255 bus_remove_device+0x2eb/0x5a0 drivers/base/bus.c:529 device_del+0x502/0xd40 drivers/base/core.c:3542 usb_disable_device+0x35b/0x7b0 drivers/usb/core/message.c:1419 usb_disconnect.cold+0x27a/0x78e drivers/usb/core/hub.c:2225 hub_port_connect drivers/usb/core/hub.c:5199 [inline] hub_port_connect_change drivers/usb/core/hub.c:5488 [inline] port_event drivers/usb/core/hub.c:5634 [inline] hub_event+0x1c9c/0x4330 drivers/usb/core/hub.c:5716 process_one_work+0x98d/0x15b0 kernel/workqueue.c:2276 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422 kthread+0x3c0/0x4a0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Allocated by task 6100: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0x61/0x80 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook mm/slab.h:519 [inline] slab_alloc_node mm/slub.c:2956 [inline] slab_alloc mm/slub.c:2964 [inline] kmem_cache_alloc+0x1d3/0x360 mm/slub.c:2969 mempool_alloc+0x146/0x350 mm/mempool.c:393 bvec_alloc+0x16b/0x200 block/bio.c:200 bio_alloc_bioset+0x36d/0x4a0 block/bio.c:446 bio_alloc include/linux/bio.h:422 [inline] io_submit_init_bio fs/ext4/page-io.c:401 [inline] io_submit_add_bh fs/ext4/page-io.c:425 [inline] ext4_bio_write_page+0xa6d/0x1970 fs/ext4/page-io.c:549 mpage_submit_page+0x127/0x220 fs/ext4/inode.c:2100 mpage_map_and_submit_buffers fs/ext4/inode.c:2348 [inline] mpage_map_and_submit_extent fs/ext4/inode.c:2487 [inline] ext4_writepages+0x2366/0x3a40 fs/ext4/inode.c:2800 do_writepages+0xec/0x290 mm/page-writeback.c:2355 __writeback_single_inode+0x126/0xeb0 fs/fs-writeback.c:1613 writeback_sb_inodes+0x567/0x1010 fs/fs-writeback.c:1878 wb_writeback+0x2a7/0xb90 fs/fs-writeback.c:2051 wb_do_writeback fs/fs-writeback.c:2196 [inline] wb_workfn+0x2d2/0x10b0 fs/fs-writeback.c:2237 process_one_work+0x98d/0x15b0 kernel/workqueue.c:2276 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422 kthread+0x3c0/0x4a0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff88811f5ec400 which belongs to the cache biovec-max of size 4096 The buggy address is located 2472 bytes inside of 4096-byte region [ffff88811f5ec400, ffff88811f5ed400) The buggy address belongs to the page: page:ffffea00047d7a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11f5e8 head:ffffea00047d7a00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x200000000010200(slab|head|node=0|zone=2) raw: 0200000000010200 0000000000000000 dead000000000122 ffff88810036b500 raw: 0000000000000000 0000000000070007 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 0xd2800(GFP_NOWAIT|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 6100, ts 866923344251, free_ts 866911638392 prep_new_page mm/page_alloc.c:2436 [inline] get_page_from_freelist+0x11d2/0x28b0 mm/page_alloc.c:4169 __alloc_pages+0x1b2/0x4e0 mm/page_alloc.c:5391 alloc_pages+0x18c/0x2a0 mm/mempolicy.c:2244 alloc_slab_page mm/slub.c:1688 [inline] allocate_slab+0x32e/0x4b0 mm/slub.c:1828 new_slab mm/slub.c:1891 [inline] new_slab_objects mm/slub.c:2637 [inline] ___slab_alloc+0x4ba/0x820 mm/slub.c:2800 __slab_alloc+0x68/0x80 mm/slub.c:2840 slab_alloc_node mm/slub.c:2922 [inline] slab_alloc mm/slub.c:2964 [inline] kmem_cache_alloc+0x339/0x360 mm/slub.c:2969 mempool_alloc+0x146/0x350 mm/mempool.c:393 bvec_alloc+0x16b/0x200 block/bio.c:200 bio_alloc_bioset+0x36d/0x4a0 block/bio.c:446 bio_alloc include/linux/bio.h:422 [inline] io_submit_init_bio fs/ext4/page-io.c:401 [inline] io_submit_add_bh fs/ext4/page-io.c:425 [inline] ext4_bio_write_page+0xa6d/0x1970 fs/ext4/page-io.c:549 mpage_submit_page+0x127/0x220 fs/ext4/inode.c:2100 mpage_map_and_submit_buffers fs/ext4/inode.c:2348 [inline] mpage_map_and_submit_extent fs/ext4/inode.c:2487 [inline] ext4_writepages+0x2366/0x3a40 fs/ext4/inode.c:2800 do_writepages+0xec/0x290 mm/page-writeback.c:2355 __writeback_single_inode+0x126/0xeb0 fs/fs-writeback.c:1613 writeback_sb_inodes+0x567/0x1010 fs/fs-writeback.c:1878 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+0x2b3/0x670 mm/page_alloc.c:1397 free_unref_page_prepare mm/page_alloc.c:3332 [inline] free_unref_page+0x19/0x490 mm/page_alloc.c:3411 kvfree+0x42/0x50 mm/util.c:616 netdev_freemem net/core/dev.c:10798 [inline] free_netdev+0x494/0x5b0 net/core/dev.c:10976 rtl871x_load_fw_cb drivers/staging/rtl8712/hal_init.c:46 [inline] rtl871x_load_fw_cb.cold+0xf7/0x117 drivers/staging/rtl8712/hal_init.c:32 request_firmware_work_func+0x12c/0x230 drivers/base/firmware_loader/main.c:1081 process_one_work+0x98d/0x15b0 kernel/workqueue.c:2276 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422 kthread+0x3c0/0x4a0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Memory state around the buggy address: ffff88811f5ecc80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88811f5ecd00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88811f5ecd80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff88811f5ece00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88811f5ece80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================