================================================================== BUG: KASAN: use-after-free in __read_once_size include/linux/compiler.h:188 [inline] BUG: KASAN: use-after-free in list_empty include/linux/list.h:203 [inline] BUG: KASAN: use-after-free in shrink_slab_memcg mm/vmscan.c:595 [inline] BUG: KASAN: use-after-free in shrink_slab+0xa04/0xa60 mm/vmscan.c:671 Read of size 8 at addr ffff88019430ced8 by task syz-executor2/16393 CPU: 1 PID: 16393 Comm: syz-executor2 Not tainted 4.18.0-rc4-next-20180713+ #7 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 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 BTRFS: device label d devid 2530879793048935964 transid 756082810144684242 /dev/loop3 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x30d mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 __read_once_size include/linux/compiler.h:188 [inline] list_empty include/linux/list.h:203 [inline] shrink_slab_memcg mm/vmscan.c:595 [inline] shrink_slab+0xa04/0xa60 mm/vmscan.c:671 shrink_node+0x429/0x16a0 mm/vmscan.c:2735 shrink_zones mm/vmscan.c:2964 [inline] do_try_to_free_pages+0x3e7/0x1290 mm/vmscan.c:3026 try_to_free_mem_cgroup_pages+0x49d/0xc90 mm/vmscan.c:3324 memory_high_write+0x283/0x310 mm/memcontrol.c:5611 cgroup_file_write+0x31f/0x840 kernel/cgroup/cgroup.c:3502 kernfs_fop_write+0x2ba/0x480 fs/kernfs/file.c:316 __vfs_write+0x117/0x9d0 fs/read_write.c:485 vfs_write+0x1fc/0x560 fs/read_write.c:549 ksys_write+0x101/0x260 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455ab9 Code: 1d ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f4dbb288c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f4dbb2896d4 RCX: 0000000000455ab9 RDX: 0000000000000001 RSI: 0000000020000000 RDI: 0000000000000018 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004c2c77 R14: 00000000004d4c80 R15: 0000000000000000 Allocated by task 761: 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.41+0x3a/0xe0 net/core/skbuff.c:137 __alloc_skb+0x155/0x790 net/core/skbuff.c:205 alloc_skb include/linux/skbuff.h:988 [inline] nlmsg_new include/net/netlink.h:511 [inline] genlmsg_new include/net/genetlink.h:354 [inline] __send_and_alloc_skb+0x83/0xe0 drivers/net/team/team.c:2352 team_nl_send_port_list_get+0x1cc/0xa70 drivers/net/team/team.c:2658 team_nl_send_event_port_get drivers/net/team/team.c:2801 [inline] __team_port_change_send+0x17f/0x470 drivers/net/team/team.c:2859 __team_port_change_check drivers/net/team/team.c:2891 [inline] team_port_change_check+0x92/0x140 drivers/net/team/team.c:2913 team_device_event+0x1b9/0x3f0 drivers/net/team/team.c:2938 notifier_call_chain+0x180/0x390 kernel/notifier.c:93 __raw_notifier_call_chain kernel/notifier.c:394 [inline] raw_notifier_call_chain+0x2d/0x40 kernel/notifier.c:401 call_netdevice_notifiers_info+0x3f/0x90 net/core/dev.c:1734 call_netdevice_notifiers net/core/dev.c:1752 [inline] dev_close_many+0x447/0x8d0 net/core/dev.c:1504 rollback_registered_many+0x52b/0xec0 net/core/dev.c:7879 unregister_netdevice_many+0xfb/0x4d0 net/core/dev.c:9007 default_device_exit_batch+0x459/0x560 net/core/dev.c:9473 ops_exit_list.isra.7+0x105/0x160 net/core/net_namespace.c:155 cleanup_net+0x537/0xb50 net/core/net_namespace.c:523 process_one_work+0xc73/0x1ba0 kernel/workqueue.c:2153 worker_thread+0x189/0x13c0 kernel/workqueue.c:2296 kthread+0x345/0x410 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:415 Freed by task 761: 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+0x105/0x1620 net/netlink/af_netlink.c:1489 netlink_broadcast+0x3a/0x50 net/netlink/af_netlink.c:1534 nlmsg_multicast include/net/netlink.h:591 [inline] genlmsg_multicast_netns include/net/genetlink.h:256 [inline] team_nl_send_multicast+0xec/0x150 drivers/net/team/team.c:2787 team_nl_send_port_list_get+0x83c/0xa70 drivers/net/team/team.c:2715 team_nl_send_event_port_get drivers/net/team/team.c:2801 [inline] __team_port_change_send+0x17f/0x470 drivers/net/team/team.c:2859 __team_port_change_check drivers/net/team/team.c:2891 [inline] team_port_change_check+0x92/0x140 drivers/net/team/team.c:2913 team_device_event+0x1b9/0x3f0 drivers/net/team/team.c:2938 notifier_call_chain+0x180/0x390 kernel/notifier.c:93 __raw_notifier_call_chain kernel/notifier.c:394 [inline] raw_notifier_call_chain+0x2d/0x40 kernel/notifier.c:401 call_netdevice_notifiers_info+0x3f/0x90 net/core/dev.c:1734 call_netdevice_notifiers net/core/dev.c:1752 [inline] dev_close_many+0x447/0x8d0 net/core/dev.c:1504 rollback_registered_many+0x52b/0xec0 net/core/dev.c:7879 unregister_netdevice_many+0xfb/0x4d0 net/core/dev.c:9007 default_device_exit_batch+0x459/0x560 net/core/dev.c:9473 ops_exit_list.isra.7+0x105/0x160 net/core/net_namespace.c:155 cleanup_net+0x537/0xb50 net/core/net_namespace.c:523 process_one_work+0xc73/0x1ba0 kernel/workqueue.c:2153 worker_thread+0x189/0x13c0 kernel/workqueue.c:2296 kthread+0x345/0x410 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:415 The buggy address belongs to the object at ffff88019430c780 which belongs to the cache kmalloc-4096 of size 4096 The buggy address is located 1880 bytes inside of 4096-byte region [ffff88019430c780, ffff88019430d780) The buggy address belongs to the page: page:ffffea000650c300 count:1 mapcount:0 mapping:ffff8801da800dc0 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffffea00071d5408 ffffea0007275808 ffff8801da800dc0 raw: 0000000000000000 ffff88019430c780 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88019430cd80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88019430ce00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88019430ce80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88019430cf00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88019430cf80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================