================================================================== BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline] BUG: KASAN: use-after-free in atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:116 [inline] BUG: KASAN: use-after-free in __refcount_add include/linux/refcount.h:193 [inline] BUG: KASAN: use-after-free in __refcount_inc include/linux/refcount.h:250 [inline] BUG: KASAN: use-after-free in refcount_inc include/linux/refcount.h:267 [inline] BUG: KASAN: use-after-free in sock_hold include/net/sock.h:726 [inline] BUG: KASAN: use-after-free in sco_sock_timeout+0x63/0x240 net/bluetooth/sco.c:89 Write of size 4 at addr ffff888023f1c080 by task kworker/1:13/4120 CPU: 1 PID: 4120 Comm: kworker/1:13 Not tainted 5.18.0-rc6-syzkaller-00015-g0ac824f379fb #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events sco_sock_timeout Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description+0x65/0x4b0 mm/kasan/report.c:313 print_report+0xf4/0x210 mm/kasan/report.c:429 kasan_report+0xfb/0x130 mm/kasan/report.c:491 kasan_check_range+0x2a7/0x2e0 mm/kasan/generic.c:189 instrument_atomic_read_write include/linux/instrumented.h:101 [inline] atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:116 [inline] __refcount_add include/linux/refcount.h:193 [inline] __refcount_inc include/linux/refcount.h:250 [inline] refcount_inc include/linux/refcount.h:267 [inline] sock_hold include/net/sock.h:726 [inline] sco_sock_timeout+0x63/0x240 net/bluetooth/sco.c:89 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 Allocated by task 17154: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] ____kasan_kmalloc+0xdc/0x110 mm/kasan/common.c:515 kasan_kmalloc include/linux/kasan.h:234 [inline] __kmalloc+0x223/0x370 mm/slub.c:4414 kmalloc include/linux/slab.h:586 [inline] kzalloc include/linux/slab.h:714 [inline] __register_sysctl_table+0xdd/0x1380 fs/proc/proc_sysctl.c:1335 __devinet_sysctl_register+0x1eb/0x2b0 net/ipv4/devinet.c:2588 devinet_sysctl_register+0x139/0x1a0 net/ipv4/devinet.c:2628 inetdev_init+0x28f/0x4c0 net/ipv4/devinet.c:279 inetdev_event+0x282/0x1400 net/ipv4/devinet.c:1536 notifier_call_chain kernel/notifier.c:84 [inline] raw_notifier_call_chain+0xe7/0x170 kernel/notifier.c:392 call_netdevice_notifiers_info net/core/dev.c:1938 [inline] call_netdevice_notifiers_extack net/core/dev.c:1976 [inline] call_netdevice_notifiers+0x14e/0x1d0 net/core/dev.c:1990 register_netdevice+0x158f/0x19a0 net/core/dev.c:9994 register_vlan_dev+0x361/0x7c0 net/8021q/vlan.c:179 vlan_newlink+0x460/0x5a0 net/8021q/vlan_netlink.c:188 __rtnl_newlink net/core/rtnetlink.c:3483 [inline] rtnl_newlink+0x1497/0x2070 net/core/rtnetlink.c:3531 rtnetlink_rcv_msg+0x92f/0xe80 net/core/rtnetlink.c:5993 netlink_rcv_skb+0x1f0/0x460 net/netlink/af_netlink.c:2503 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x7e7/0x9c0 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x9b3/0xcd0 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg net/socket.c:725 [inline] ____sys_sendmsg+0x597/0x8e0 net/socket.c:2413 ___sys_sendmsg net/socket.c:2467 [inline] __sys_sendmsg+0x27e/0x370 net/socket.c:2496 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 16584: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0xd8/0x110 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1754 slab_free mm/slub.c:3510 [inline] kmem_cache_free_bulk+0x105/0x1d0 mm/slub.c:3657 kfree_bulk include/linux/slab.h:437 [inline] kfree_rcu_work+0x35b/0x7c0 kernel/rcu/tree.c:3318 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:348 kvfree_call_rcu+0x118/0x840 kernel/rcu/tree.c:3595 drop_sysctl_table+0x31c/0x460 fs/proc/proc_sysctl.c:1705 unregister_sysctl_table+0x87/0x140 fs/proc/proc_sysctl.c:1743 __devinet_sysctl_unregister net/ipv4/devinet.c:2611 [inline] devinet_sysctl_unregister net/ipv4/devinet.c:2639 [inline] inetdev_destroy net/ipv4/devinet.c:327 [inline] inetdev_event+0x7ad/0x1400 net/ipv4/devinet.c:1604 notifier_call_chain kernel/notifier.c:84 [inline] raw_notifier_call_chain+0xe7/0x170 kernel/notifier.c:392 call_netdevice_notifiers_info net/core/dev.c:1938 [inline] call_netdevice_notifiers_extack net/core/dev.c:1976 [inline] call_netdevice_notifiers net/core/dev.c:1990 [inline] unregister_netdevice_many+0xeee/0x1950 net/core/dev.c:10747 __rtnl_newlink net/core/rtnetlink.c:3514 [inline] rtnl_newlink+0x1b6a/0x2070 net/core/rtnetlink.c:3531 rtnetlink_rcv_msg+0x92f/0xe80 net/core/rtnetlink.c:5993 netlink_rcv_skb+0x1f0/0x460 net/netlink/af_netlink.c:2503 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x7e7/0x9c0 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x9b3/0xcd0 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg net/socket.c:725 [inline] ____sys_sendmsg+0x597/0x8e0 net/socket.c:2413 ___sys_sendmsg net/socket.c:2467 [inline] __sys_sendmsg+0x27e/0x370 net/socket.c:2496 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Second to last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:348 insert_work+0x54/0x3e0 kernel/workqueue.c:1358 __queue_work+0x969/0xc20 kernel/workqueue.c:1517 queue_work_on+0x137/0x240 kernel/workqueue.c:1545 queue_work include/linux/workqueue.h:502 [inline] io_ring_ctx_wait_and_kill+0x325/0x387 fs/io_uring.c:10176 io_uring_release+0x59/0x70 fs/io_uring.c:10184 __fput+0x3b9/0x820 fs/file_table.c:317 task_work_run+0x146/0x1c0 kernel/task_work.c:164 exit_task_work include/linux/task_work.h:37 [inline] do_exit+0x547/0x1eb0 kernel/exit.c:795 do_group_exit+0x23b/0x2f0 kernel/exit.c:925 get_signal+0x172f/0x1780 kernel/signal.c:2864 arch_do_signal_or_restart+0x8d/0x750 arch/x86/kernel/signal.c:867 exit_to_user_mode_loop+0x74/0x160 kernel/entry/common.c:166 exit_to_user_mode_prepare+0xad/0x110 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff888023f1c000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 128 bytes inside of 2048-byte region [ffff888023f1c000, ffff888023f1c800) The buggy address belongs to the physical page: page:ffffea00008fc600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x23f18 head:ffffea00008fc600 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000001 ffff888011442000 raw: 0000000000000000 0000000000080008 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 9674512226, free_ts 0 prep_new_page mm/page_alloc.c:2441 [inline] get_page_from_freelist+0x72e/0x7a0 mm/page_alloc.c:4182 __alloc_pages+0x26c/0x5f0 mm/page_alloc.c:5408 alloc_page_interleave+0x22/0x1c0 mm/mempolicy.c:2104 alloc_slab_page+0x70/0xf0 mm/slub.c:1799 allocate_slab+0x5e/0x560 mm/slub.c:1944 new_slab mm/slub.c:2004 [inline] ___slab_alloc+0x41e/0xcd0 mm/slub.c:3005 __slab_alloc mm/slub.c:3092 [inline] slab_alloc_node mm/slub.c:3183 [inline] slab_alloc mm/slub.c:3225 [inline] __kmalloc+0x2ba/0x370 mm/slub.c:4410 kmalloc include/linux/slab.h:586 [inline] sk_prot_alloc+0xde/0x200 net/core/sock.c:1936 sk_alloc+0x36/0x340 net/core/sock.c:1989 __netlink_create+0x68/0x220 net/netlink/af_netlink.c:647 __netlink_kernel_create+0x1cf/0x7b0 net/netlink/af_netlink.c:2047 netlink_kernel_create include/linux/netlink.h:62 [inline] diag_net_init+0xa3/0x120 net/core/sock_diag.c:319 ops_init+0x313/0x430 net/core/net_namespace.c:134 __register_pernet_operations net/core/net_namespace.c:1146 [inline] register_pernet_operations+0x2af/0x620 net/core/net_namespace.c:1215 register_pernet_subsys+0x24/0x40 net/core/net_namespace.c:1256 do_one_initcall+0xbd/0x2b0 init/main.c:1298 page_owner free stack trace missing Memory state around the buggy address: ffff888023f1bf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888023f1c000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888023f1c080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888023f1c100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888023f1c180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================