================================================================== BUG: KASAN: slab-out-of-bounds in atomic_read include/asm-generic/atomic-instrumented.h:21 [inline] BUG: KASAN: slab-out-of-bounds in refcount_read include/linux/refcount.h:42 [inline] BUG: KASAN: slab-out-of-bounds in check_net include/net/net_namespace.h:236 [inline] BUG: KASAN: slab-out-of-bounds in rds_destroy_pending net/rds/rds.h:902 [inline] BUG: KASAN: slab-out-of-bounds in rds_cong_queue_updates+0x25d/0x5b0 net/rds/cong.c:226 Read of size 4 at addr ffff88019c4680c4 by task kworker/u4:5/7841 CPU: 1 PID: 7841 Comm: kworker/u4:5 Not tainted 4.18.0-rc3+ #127 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: krdsd rds_send_worker Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412 check_memory_region_inline mm/kasan/kasan.c:260 [inline] check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267 kasan_check_read+0x11/0x20 mm/kasan/kasan.c:272 atomic_read include/asm-generic/atomic-instrumented.h:21 [inline] refcount_read include/linux/refcount.h:42 [inline] check_net include/net/net_namespace.h:236 [inline] rds_destroy_pending net/rds/rds.h:902 [inline] rds_cong_queue_updates+0x25d/0x5b0 net/rds/cong.c:226 rds_recv_rcvbuf_delta.part.3+0x332/0x3e0 net/rds/recv.c:123 rds_recv_rcvbuf_delta net/rds/recv.c:382 [inline] rds_recv_incoming+0x85a/0x1320 net/rds/recv.c:382 rds_loop_xmit+0x16a/0x340 net/rds/loop.c:82 rds_send_xmit+0x1343/0x29c0 net/rds/send.c:355 rds_send_worker+0x153/0x300 net/rds/threads.c:199 process_one_work+0xc73/0x1ba0 kernel/workqueue.c:2153 worker_thread+0x189/0x13c0 kernel/workqueue.c:2296 kthread+0x345/0x410 kernel/kthread.c:240 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 Allocated by task 31207: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 __do_kmalloc_node mm/slab.c:3682 [inline] __kmalloc_node_track_caller+0x47/0x70 mm/slab.c:3696 __kmalloc_reserve.isra.40+0x3a/0xe0 net/core/skbuff.c:137 __alloc_skb+0x155/0x790 net/core/skbuff.c:205 alloc_skb include/linux/skbuff.h:987 [inline] nlmsg_new include/net/netlink.h:511 [inline] rtmsg_ifinfo_build_skb+0x73/0x190 net/core/rtnetlink.c:3261 rtmsg_ifinfo_event.part.30+0x45/0xe0 net/core/rtnetlink.c:3297 rtmsg_ifinfo_event net/core/rtnetlink.c:3308 [inline] rtmsg_ifinfo+0x8c/0xa0 net/core/rtnetlink.c:3306 register_netdevice+0xca2/0x11d0 net/core/dev.c:8040 register_netdev+0x30/0x50 net/core/dev.c:8114 vti6_init_net+0x5c8/0x9b0 net/ipv6/ip6_vti.c:1129 ops_init+0x101/0x560 net/core/net_namespace.c:128 setup_net+0x3d9/0x980 net/core/net_namespace.c:313 copy_net_ns+0x2b8/0x4d0 net/core/net_namespace.c:436 create_new_namespaces+0x6ad/0x900 kernel/nsproxy.c:107 unshare_nsproxy_namespaces+0xc3/0x1f0 kernel/nsproxy.c:206 ksys_unshare+0x723/0xfb0 kernel/fork.c:2419 __do_sys_unshare kernel/fork.c:2487 [inline] __se_sys_unshare kernel/fork.c:2485 [inline] __x64_sys_unshare+0x31/0x40 kernel/fork.c:2485 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 31207: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xd9/0x260 mm/slab.c:3813 skb_free_head+0x99/0xc0 net/core/skbuff.c:550 pskb_expand_head+0x3b9/0x10e0 net/core/skbuff.c:1494 netlink_trim+0x2ea/0x380 net/netlink/af_netlink.c:1292 netlink_broadcast_filtered+0x105/0x1630 net/netlink/af_netlink.c:1489 netlink_broadcast net/netlink/af_netlink.c:1534 [inline] nlmsg_multicast include/net/netlink.h:591 [inline] nlmsg_notify+0xa0/0x1a0 net/netlink/af_netlink.c:2491 rtnl_notify net/core/rtnetlink.c:732 [inline] rtmsg_ifinfo_send net/core/rtnetlink.c:3285 [inline] rtmsg_ifinfo_event.part.30+0xb2/0xe0 net/core/rtnetlink.c:3300 rtmsg_ifinfo_event net/core/rtnetlink.c:3308 [inline] rtmsg_ifinfo+0x8c/0xa0 net/core/rtnetlink.c:3306 register_netdevice+0xca2/0x11d0 net/core/dev.c:8040 register_netdev+0x30/0x50 net/core/dev.c:8114 vti6_init_net+0x5c8/0x9b0 net/ipv6/ip6_vti.c:1129 ops_init+0x101/0x560 net/core/net_namespace.c:128 setup_net+0x3d9/0x980 net/core/net_namespace.c:313 copy_net_ns+0x2b8/0x4d0 net/core/net_namespace.c:436 create_new_namespaces+0x6ad/0x900 kernel/nsproxy.c:107 unshare_nsproxy_namespaces+0xc3/0x1f0 kernel/nsproxy.c:206 ksys_unshare+0x723/0xfb0 kernel/fork.c:2419 __do_sys_unshare kernel/fork.c:2487 [inline] __se_sys_unshare kernel/fork.c:2485 [inline] __x64_sys_unshare+0x31/0x40 kernel/fork.c:2485 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88019c468a40 which belongs to the cache kmalloc-4096 of size 4096 The buggy address is located 2428 bytes to the left of 4096-byte region [ffff88019c468a40, ffff88019c469a40) The buggy address belongs to the page: page:ffffea0006711a00 count:1 mapcount:0 mapping:ffff8801da800dc0 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffffea00072cb688 ffffea00064f9988 ffff8801da800dc0 raw: 0000000000000000 ffff88019c468a40 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88019c467f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88019c468000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88019c468080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88019c468100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88019c468180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================