bisecting fixing commit since d18b78abc0c6e7d3119367c931c583e02d466495 building syzkaller on cef5ae6814696260ff58c538a1b6044af90c5979 testing commit d18b78abc0c6e7d3119367c931c583e02d466495 with gcc (GCC) 8.1.0 kernel signature: 5be94af50a41399e99426c9e6d26fdcf0211d4e1306a718eb494f84688ba26d5 all runs: crashed: KASAN: use-after-free Read in __nf_tables_abort testing current HEAD 015e94d0e37b6860e4354ce3cac56bd7c39c8992 testing commit 015e94d0e37b6860e4354ce3cac56bd7c39c8992 with gcc (GCC) 8.1.0 kernel signature: 65aa5fdea15f882de64f90248ee0895097ed98ab3602c55c560a11111113c4aa all runs: crashed: KASAN: use-after-free Read in __nf_tables_abort revisions tested: 2, total time: 24m11.354043336s (build: 17m28.020645935s, test: 5m57.446078545s) the crash still happens on HEAD commit msg: Linux 4.19.146 crash: KASAN: use-after-free Read in __nf_tables_abort IPv6: ADDRCONF(NETDEV_UP): batadv_slave_1: link is not ready batman_adv: batadv0: Interface activated: batadv_slave_1 IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready ================================================================== BUG: KASAN: use-after-free in __list_del_entry_valid+0xd0/0xf3 lib/list_debug.c:42 Read of size 8 at addr ffff8880a82f6808 by task syz-executor.5/7964 CPU: 0 PID: 7964 Comm: syz-executor.5 Not tainted 4.19.146-syzkaller #0 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+0x17c/0x22a lib/dump_stack.c:118 print_address_description.cold.6+0x9/0x211 mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x307 mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 __list_del_entry_valid+0xd0/0xf3 lib/list_debug.c:42 __list_del_entry include/linux/list.h:117 [inline] list_del_rcu include/linux/rculist.h:130 [inline] __nf_tables_abort+0x1556/0x1eb0 net/netfilter/nf_tables_api.c:6659 nf_tables_abort+0xf/0x30 net/netfilter/nf_tables_api.c:6769 nfnetlink_rcv_batch+0x4e3/0x1520 net/netfilter/nfnetlink.c:496 nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:545 [inline] nfnetlink_rcv+0x2f1/0x3b0 net/netfilter/nfnetlink.c:563 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x443/0x660 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x666/0xc50 net/netlink/af_netlink.c:1909 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xac/0xf0 net/socket.c:632 ___sys_sendmsg+0x647/0x950 net/socket.c:2115 __sys_sendmsg+0xd9/0x180 net/socket.c:2153 __do_sys_sendmsg net/socket.c:2162 [inline] __se_sys_sendmsg net/socket.c:2160 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2160 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45d579 Code: 5d b4 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 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fe96d29fc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000002a4c0 RCX: 000000000045d579 RDX: 0000000000000000 RSI: 0000000020000280 RDI: 0000000000000003 RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c R13: 00007fff3a99471f R14: 00007fe96d2a09c0 R15: 000000000118cf4c Allocated by task 7964: save_stack mm/kasan/kasan.c:448 [inline] set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc.part.1+0x62/0xf0 mm/kasan/kasan.c:553 kasan_kmalloc+0xaf/0xc0 mm/kasan/kasan.c:538 kmem_cache_alloc_trace+0x152/0x3a0 mm/slab.c:3625 kmalloc include/linux/slab.h:515 [inline] kzalloc include/linux/slab.h:709 [inline] nf_tables_newtable+0x617/0x1400 net/netfilter/nf_tables_api.c:882 nfnetlink_rcv_batch+0x8cd/0x1520 net/netfilter/nfnetlink.c:435 nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:545 [inline] nfnetlink_rcv+0x2f1/0x3b0 net/netfilter/nfnetlink.c:563 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x443/0x660 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x666/0xc50 net/netlink/af_netlink.c:1909 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xac/0xf0 net/socket.c:632 ___sys_sendmsg+0x647/0x950 net/socket.c:2115 __sys_sendmsg+0xd9/0x180 net/socket.c:2153 __do_sys_sendmsg net/socket.c:2162 [inline] __se_sys_sendmsg net/socket.c:2160 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2160 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 7974: save_stack mm/kasan/kasan.c:448 [inline] set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x13c/0x220 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3503 [inline] kfree+0xcf/0x220 mm/slab.c:3822 nf_tables_table_destroy.isra.9+0xd4/0x110 net/netfilter/nf_tables_api.c:1061 nft_commit_release net/netfilter/nf_tables_api.c:6276 [inline] nf_tables_commit_release net/netfilter/nf_tables_api.c:6316 [inline] nf_tables_commit+0x12b6/0x4df0 net/netfilter/nf_tables_api.c:6606 nfnetlink_rcv_batch+0xb75/0x1520 net/netfilter/nfnetlink.c:487 nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:545 [inline] nfnetlink_rcv+0x2f1/0x3b0 net/netfilter/nfnetlink.c:563 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x443/0x660 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x666/0xc50 net/netlink/af_netlink.c:1909 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xac/0xf0 net/socket.c:632 ___sys_sendmsg+0x647/0x950 net/socket.c:2115 __sys_sendmsg+0xd9/0x180 net/socket.c:2153 __do_sys_sendmsg net/socket.c:2162 [inline] __se_sys_sendmsg net/socket.c:2160 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2160 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880a82f6800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 8 bytes inside of 512-byte region [ffff8880a82f6800, ffff8880a82f6a00) The buggy address belongs to the page: page:ffffea0002a0bd80 count:1 mapcount:0 mapping:ffff88812c29c940 index:0x0 flags: 0xfffe0000000100(slab) raw: 00fffe0000000100 ffffea0002a34348 ffffea0002286248 ffff88812c29c940 raw: 0000000000000000 ffff8880a82f6080 0000000100000006 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a82f6700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a82f6780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880a82f6800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880a82f6880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a82f6900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== list_del corruption, ffff88808ab10a00->prev is LIST_POISON2 (dead000000000200) Bluetooth: hci0: command 0x0419 tx timeout list_del corruption, ffff88808ab10000->prev is LIST_POISON2 (dead000000000200)