Hello, When using Healer to fuzz the latest Linux kernel, the following crash was triggered. HEAD commit: 42d43c92fc57 Merge branch 'for-linus' git tree: upstream console output: https://drive.google.com/file/d/1ibZB4dfXnXoDznHOKdxaNC3OOq-mob9e/view?usp=sharing kernel config: https://drive.google.com/file/d/1ibZB4dfXnXoDznHOKdxaNC3OOq-mob9e/view?usp=sharing Sorry, I don't have a reproducer for this crash, hope the symbolized report can help. If you fix this issue, please add the following tag to the commit: Reported-by: Hao Sun <sunhao.th@xxxxxxxxx> ================================================================== BUG: KASAN: use-after-free in hci_cmd_timeout+0x203/0x210 net/bluetooth/hci_core.c:2774 Read of size 2 at addr ffff88801dcf8008 by task kworker/1:0/22 CPU: 1 PID: 22 Comm: kworker/1:0 Not tainted 5.15.0-rc3+ #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 Workqueue: events hci_cmd_timeout Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0x93/0x334 mm/kasan/report.c:256 __kasan_report mm/kasan/report.c:442 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:459 hci_cmd_timeout+0x203/0x210 net/bluetooth/hci_core.c:2774 process_one_work+0x9df/0x16d0 kernel/workqueue.c:2297 worker_thread+0x90/0xed0 kernel/workqueue.c:2444 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Allocated by task 14281: 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_kmalloc mm/kasan/common.c:513 [inline] ____kasan_kmalloc mm/kasan/common.c:472 [inline] __kasan_kmalloc+0xa4/0xd0 mm/kasan/common.c:522 kasan_kmalloc ./include/linux/kasan.h:264 [inline] __kmalloc+0x1c1/0x390 mm/slub.c:4391 kmalloc ./include/linux/slab.h:596 [inline] kzalloc ./include/linux/slab.h:721 [inline] ops_init+0xfb/0x420 net/core/net_namespace.c:130 setup_net+0x415/0xa40 net/core/net_namespace.c:326 copy_net_ns+0x2d9/0x660 net/core/net_namespace.c:470 create_new_namespaces.isra.0+0x3cb/0xae0 kernel/nsproxy.c:110 copy_namespaces+0x391/0x450 kernel/nsproxy.c:178 copy_process+0x2d37/0x73d0 kernel/fork.c:2197 kernel_clone+0xe7/0x10d0 kernel/fork.c:2584 __do_sys_clone+0xc8/0x110 kernel/fork.c:2701 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 6594: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:360 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free mm/kasan/common.c:328 [inline] __kasan_slab_free+0x100/0x140 mm/kasan/common.c:374 kasan_slab_free ./include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1700 [inline] slab_free_freelist_hook mm/slub.c:1725 [inline] slab_free mm/slub.c:3483 [inline] kfree+0xfc/0x700 mm/slub.c:4543 skb_free_head+0x8b/0xa0 net/core/skbuff.c:654 skb_release_data+0x5bf/0x700 net/core/skbuff.c:676 skb_release_all+0x46/0x60 net/core/skbuff.c:741 __kfree_skb net/core/skbuff.c:755 [inline] kfree_skb net/core/skbuff.c:773 [inline] kfree_skb+0xfa/0x3a0 net/core/skbuff.c:767 hci_dev_do_open+0xa50/0x1820 net/bluetooth/hci_core.c:1634 hci_power_on+0x133/0x650 net/bluetooth/hci_core.c:2263 process_one_work+0x9df/0x16d0 kernel/workqueue.c:2297 worker_thread+0x90/0xed0 kernel/workqueue.c:2444 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xe9/0x110 mm/kasan/generic.c:348 kvfree_call_rcu+0x74/0xab0 kernel/rcu/tree.c:3552 drop_sysctl_table+0x2e7/0x3b0 fs/proc/proc_sysctl.c:1647 unregister_sysctl_table+0xc2/0x190 fs/proc/proc_sysctl.c:1685 mpls_dev_sysctl_unregister+0x80/0xc0 net/mpls/af_mpls.c:1441 mpls_dev_notify+0x458/0x770 net/mpls/af_mpls.c:1621 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 call_netdevice_notifiers_info net/core/dev.c:1996 [inline] call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1981 call_netdevice_notifiers_extack net/core/dev.c:2008 [inline] call_netdevice_notifiers net/core/dev.c:2022 [inline] unregister_netdevice_many+0x930/0x14e0 net/core/dev.c:11043 vti6_exit_batch_net+0x3ad/0x690 net/ipv6/ip6_vti.c:1188 ops_exit_list.isra.0+0x103/0x150 net/core/net_namespace.c:171 cleanup_net+0x511/0xa90 net/core/net_namespace.c:591 process_one_work+0x9df/0x16d0 kernel/workqueue.c:2297 worker_thread+0x90/0xed0 kernel/workqueue.c:2444 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Second to last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xe9/0x110 mm/kasan/generic.c:348 kvfree_call_rcu+0x74/0xab0 kernel/rcu/tree.c:3552 ma_put net/ipv6/mcast.c:869 [inline] ma_put+0x11c/0x180 net/ipv6/mcast.c:865 __ipv6_dev_mc_dec+0x278/0x340 net/ipv6/mcast.c:982 addrconf_leave_solict.part.0+0xb5/0xf0 net/ipv6/addrconf.c:2189 addrconf_leave_solict net/ipv6/addrconf.c:6124 [inline] __ipv6_ifa_notify+0x2a7/0xb40 net/ipv6/addrconf.c:6124 addrconf_ifdown+0x92f/0x14d0 net/ipv6/addrconf.c:3835 addrconf_notify+0xeb/0x1bc0 net/ipv6/addrconf.c:3646 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 call_netdevice_notifiers_info net/core/dev.c:1996 [inline] call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1981 call_netdevice_notifiers_extack net/core/dev.c:2008 [inline] call_netdevice_notifiers net/core/dev.c:2022 [inline] dev_close_many+0x2fc/0x630 net/core/dev.c:1597 unregister_netdevice_many+0x420/0x14e0 net/core/dev.c:11020 default_device_exit_batch+0x302/0x3c0 net/core/dev.c:11573 ops_exit_list.isra.0+0x103/0x150 net/core/net_namespace.c:171 cleanup_net+0x511/0xa90 net/core/net_namespace.c:591 process_one_work+0x9df/0x16d0 kernel/workqueue.c:2297 worker_thread+0x90/0xed0 kernel/workqueue.c:2444 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff88801dcf8000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 8 bytes inside of 512-byte region [ffff88801dcf8000, ffff88801dcf8200) The buggy address belongs to the page: page:ffffea0000773e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1dcf8 head:ffffea0000773e00 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 0000000300000001 ffff888010c42c80 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd2000(__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, ts 19546740260, free_ts 0 set_page_owner ./include/linux/page_owner.h:31 [inline] post_alloc_hook mm/page_alloc.c:2418 [inline] prep_new_page+0x1a5/0x240 mm/page_alloc.c:2424 get_page_from_freelist+0x1f10/0x3b70 mm/page_alloc.c:4153 __alloc_pages+0x306/0x6e0 mm/page_alloc.c:5375 alloc_page_interleave+0x1e/0x1f0 mm/mempolicy.c:2042 alloc_pages+0x1e4/0x240 mm/mempolicy.c:2192 alloc_slab_page mm/slub.c:1763 [inline] allocate_slab mm/slub.c:1900 [inline] new_slab+0x34a/0x480 mm/slub.c:1963 ___slab_alloc+0xa9f/0x10d0 mm/slub.c:2994 __slab_alloc.isra.0+0x4d/0xa0 mm/slub.c:3081 slab_alloc_node mm/slub.c:3172 [inline] slab_alloc mm/slub.c:3214 [inline] kmem_cache_alloc_trace+0x31c/0x340 mm/slub.c:3231 kmalloc ./include/linux/slab.h:591 [inline] usb_cache_string+0x5e/0x110 drivers/usb/core/message.c:1027 usb_enumerate_device drivers/usb/core/hub.c:2405 [inline] usb_new_device+0x15b/0x760 drivers/usb/core/hub.c:2533 register_root_hub+0x420/0x572 drivers/usb/core/hcd.c:1010 usb_add_hcd.cold+0x1100/0x134a drivers/usb/core/hcd.c:2972 vhci_hcd_probe+0x150/0x3a0 drivers/usb/usbip/vhci_hcd.c:1362 platform_probe+0xfc/0x1f0 drivers/base/platform.c:1411 call_driver_probe drivers/base/dd.c:517 [inline] really_probe drivers/base/dd.c:596 [inline] really_probe+0x245/0xbd0 drivers/base/dd.c:541 page_owner free stack trace missing Memory state around the buggy address: ffff88801dcf7f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801dcf7f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88801dcf8000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801dcf8080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801dcf8100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================
