Hello, syzbot found the following crash on: HEAD commit: 8bbbc5cf kmsan: don't compile memmove git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=17325b4ee00000 kernel config: https://syzkaller.appspot.com/x/.config?x=cd0e9a6b0e555cc3 dashboard link: https://syzkaller.appspot.com/bug?extid=8fbe17d9bdd5c8815211 compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10c39881e00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11924edde00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+8fbe17d9bdd5c8815211@xxxxxxxxxxxxxxxxxxxxxxxxx batman_adv: batadv0: Interface activated: batadv_slave_1 ===================================================== BUG: KMSAN: uninit-value in list_splice include/linux/list.h:437 [inline] BUG: KMSAN: uninit-value in nf_flow_table_block_setup net/netfilter/nf_flow_table_offload.c:826 [inline] BUG: KMSAN: uninit-value in nf_flow_table_offload_setup+0x964/0xac0 net/netfilter/nf_flow_table_offload.c:883 CPU: 1 PID: 11672 Comm: syz-executor942 Not tainted 5.6.0-rc2-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+0x1c9/0x220 lib/dump_stack.c:118 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:118 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215 list_splice include/linux/list.h:437 [inline] nf_flow_table_block_setup net/netfilter/nf_flow_table_offload.c:826 [inline] nf_flow_table_offload_setup+0x964/0xac0 net/netfilter/nf_flow_table_offload.c:883 nft_register_flowtable_net_hooks net/netfilter/nf_tables_api.c:6185 [inline] nf_tables_newflowtable+0x233c/0x3e30 net/netfilter/nf_tables_api.c:6302 nfnetlink_rcv_batch net/netfilter/nfnetlink.c:433 [inline] nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:543 [inline] nfnetlink_rcv+0x155e/0x3ab0 net/netfilter/nfnetlink.c:561 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline] netlink_unicast+0xf9e/0x1100 net/netlink/af_netlink.c:1328 netlink_sendmsg+0x1246/0x14d0 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] ____sys_sendmsg+0x12b6/0x1350 net/socket.c:2343 ___sys_sendmsg net/socket.c:2397 [inline] __sys_sendmsg+0x451/0x5f0 net/socket.c:2430 __do_sys_sendmsg net/socket.c:2439 [inline] __se_sys_sendmsg+0x97/0xb0 net/socket.c:2437 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2437 do_syscall_64+0xb8/0x160 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x443709 Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 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 7b 10 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fffe96ae538 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000443709 RDX: 0000000000000000 RSI: 0000000020003e00 RDI: 0000000000000003 RBP: 00007fffe96ae550 R08: 0000000001bbbbbb R09: 0000000001bbbbbb R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000404ca0 R14: 0000000000000000 R15: 0000000000000000 Local variable ----bo@nf_flow_table_offload_setup created at: nf_flow_table_offload_setup+0xba/0xac0 net/netfilter/nf_flow_table_offload.c:876 nf_flow_table_offload_setup+0xba/0xac0 net/netfilter/nf_flow_table_offload.c:876 ===================================================== --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches
