================================================================== BUG: KASAN: use-after-free in instrument_atomic_read include/linux/instrumented.h:72 [inline] BUG: KASAN: use-after-free in atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline] BUG: KASAN: use-after-free in refcount_read include/linux/refcount.h:147 [inline] BUG: KASAN: use-after-free in rxrpc_destroy_all_locals+0x10a/0x180 net/rxrpc/local_object.c:434 Read of size 4 at addr ffff8880771d2814 by task kworker/u4:6/5412 CPU: 0 PID: 5412 Comm: kworker/u4:6 Not tainted 6.1.0-syzkaller-09671-gbb5747cfbc4b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Workqueue: netns cleanup_net Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x15e/0x45d mm/kasan/report.c:395 kasan_report+0xbf/0x1f0 mm/kasan/report.c:495 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0x141/0x190 mm/kasan/generic.c:189 instrument_atomic_read include/linux/instrumented.h:72 [inline] atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline] refcount_read include/linux/refcount.h:147 [inline] rxrpc_destroy_all_locals+0x10a/0x180 net/rxrpc/local_object.c:434 rxrpc_exit_net+0x174/0x300 net/rxrpc/net_ns.c:128 ops_exit_list+0xb0/0x170 net/core/net_namespace.c:169 cleanup_net+0x4ee/0xb10 net/core/net_namespace.c:606 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 worker_thread+0x669/0x1090 kernel/workqueue.c:2436 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Allocated by task 13400: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:371 [inline] ____kasan_kmalloc mm/kasan/common.c:330 [inline] __kasan_kmalloc+0xa5/0xb0 mm/kasan/common.c:380 kmalloc include/linux/slab.h:580 [inline] kzalloc include/linux/slab.h:720 [inline] rxrpc_alloc_local net/rxrpc/local_object.c:93 [inline] rxrpc_lookup_local+0x4d9/0xfb0 net/rxrpc/local_object.c:249 rxrpc_bind+0x35e/0x5c0 net/rxrpc/af_rxrpc.c:150 afs_open_socket+0x1b4/0x360 fs/afs/rxrpc.c:64 afs_net_init+0xa79/0xed0 fs/afs/main.c:126 ops_init+0xb9/0x680 net/core/net_namespace.c:135 setup_net+0x793/0xe60 net/core/net_namespace.c:333 copy_net_ns+0x31b/0x6b0 net/core/net_namespace.c:483 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 copy_namespaces+0x3b3/0x4a0 kernel/nsproxy.c:179 copy_process+0x30e5/0x7230 kernel/fork.c:2250 kernel_clone+0xeb/0x990 kernel/fork.c:2667 __do_sys_clone+0xba/0x100 kernel/fork.c:2808 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 15: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:518 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1807 slab_free mm/slub.c:3787 [inline] __kmem_cache_free+0xaf/0x3b0 mm/slub.c:3800 rcu_do_batch kernel/rcu/tree.c:2244 [inline] rcu_core+0x81f/0x1980 kernel/rcu/tree.c:2504 __do_softirq+0x1fb/0xadc kernel/softirq.c:571 Last potentially related work creation: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:488 __call_rcu_common.constprop.0+0x99/0x820 kernel/rcu/tree.c:2753 rxrpc_put_local.part.0+0x128/0x170 net/rxrpc/local_object.c:332 rxrpc_put_local+0x25/0x30 net/rxrpc/local_object.c:324 rxrpc_release_sock net/rxrpc/af_rxrpc.c:888 [inline] rxrpc_release+0x237/0x550 net/rxrpc/af_rxrpc.c:914 __sock_release net/socket.c:650 [inline] sock_release+0x8b/0x1b0 net/socket.c:678 afs_close_socket+0x1ce/0x330 fs/afs/rxrpc.c:125 afs_net_exit+0x179/0x320 fs/afs/main.c:158 ops_exit_list+0xb0/0x170 net/core/net_namespace.c:169 cleanup_net+0x4ee/0xb10 net/core/net_namespace.c:606 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 worker_thread+0x669/0x1090 kernel/workqueue.c:2436 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 The buggy address belongs to the object at ffff8880771d2800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 20 bytes inside of 1024-byte region [ffff8880771d2800, ffff8880771d2c00) The buggy address belongs to the physical page: page:ffffea0001dc7400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x771d0 head:ffffea0001dc7400 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffff888012441dc0 ffffea0001fdfc00 dead000000000002 raw: 0000000000000000 0000000000100010 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 15, tgid 15 (ksoftirqd/0), ts 76236333781, free_ts 76229786903 prep_new_page mm/page_alloc.c:2539 [inline] get_page_from_freelist+0x10b5/0x2d50 mm/page_alloc.c:4291 __alloc_pages+0x1cb/0x5b0 mm/page_alloc.c:5558 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2285 alloc_slab_page mm/slub.c:1851 [inline] allocate_slab+0x25f/0x350 mm/slub.c:1998 new_slab mm/slub.c:2051 [inline] ___slab_alloc+0xa91/0x1400 mm/slub.c:3193 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3292 __slab_alloc_node mm/slub.c:3345 [inline] slab_alloc_node mm/slub.c:3442 [inline] __kmem_cache_alloc_node+0x1a4/0x430 mm/slub.c:3491 __do_kmalloc_node mm/slab_common.c:967 [inline] __kmalloc_node_track_caller+0x4b/0xc0 mm/slab_common.c:988 kmalloc_reserve net/core/skbuff.c:492 [inline] __alloc_skb+0xe9/0x310 net/core/skbuff.c:565 alloc_skb include/linux/skbuff.h:1270 [inline] __tcp_send_ack.part.0+0x67/0x760 net/ipv4/tcp_output.c:3957 __tcp_send_ack net/ipv4/tcp_output.c:3989 [inline] tcp_send_ack+0x81/0xa0 net/ipv4/tcp_output.c:3989 __tcp_ack_snd_check+0x156/0x9c0 net/ipv4/tcp_input.c:5536 tcp_rcv_established+0x1bc7/0x2230 net/ipv4/tcp_input.c:5980 tcp_v4_do_rcv+0x670/0x9b0 net/ipv4/tcp_ipv4.c:1721 tcp_v4_rcv+0x2eab/0x3280 net/ipv4/tcp_ipv4.c:2142 ip_protocol_deliver_rcu+0x9f/0x460 net/ipv4/ip_input.c:205 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+0x65c/0xd90 mm/page_alloc.c:1509 free_unref_page_prepare mm/page_alloc.c:3387 [inline] free_unref_page+0x1d/0x4d0 mm/page_alloc.c:3483 skb_free_frag include/linux/skbuff.h:3193 [inline] skb_free_head+0x96/0x110 net/core/skbuff.c:820 skb_release_data+0x5f4/0x870 net/core/skbuff.c:851 skb_release_all net/core/skbuff.c:916 [inline] __kfree_skb net/core/skbuff.c:930 [inline] skb_attempt_defer_free+0x309/0x3e0 net/core/skbuff.c:6705 tcp_eat_recv_skb net/ipv4/tcp.c:1638 [inline] tcp_recvmsg_locked+0x124e/0x22b0 net/ipv4/tcp.c:2633 tcp_recvmsg+0x117/0x620 net/ipv4/tcp.c:2679 inet_recvmsg+0x114/0x5e0 net/ipv4/af_inet.c:861 sock_recvmsg_nosec net/socket.c:995 [inline] sock_recvmsg net/socket.c:1013 [inline] sock_recvmsg net/socket.c:1009 [inline] sock_read_iter+0x348/0x480 net/socket.c:1086 call_read_iter include/linux/fs.h:2180 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x7fa/0x930 fs/read_write.c:470 ksys_read+0x1ec/0x250 fs/read_write.c:613 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff8880771d2700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880771d2780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880771d2800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880771d2880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880771d2900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================