Hello, syzbot found the following crash on: HEAD commit: 7ae77150 Merge tag 'powerpc-5.8-1' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10fcd90e100000 kernel config: https://syzkaller.appspot.com/x/.config?x=9a1aa05456dfd557 dashboard link: https://syzkaller.appspot.com/bug?extid=38b8b548a851a01793c5 compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=129c54c1100000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11c0355a100000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+38b8b548a851a01793c5@xxxxxxxxxxxxxxxxxxxxxxxxx executing program executing program executing program BUG: memory leak unreferenced object 0xffff88811c505300 (size 128): comm "syz-executor470", pid 6431, jiffies 4294945909 (age 13.210s) hex dump (first 32 bytes): 00 00 00 00 02 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<00000000da2809df>] kmalloc include/linux/slab.h:555 [inline] [<00000000da2809df>] kzalloc include/linux/slab.h:669 [inline] [<00000000da2809df>] ctnetlink_alloc_filter+0x3a/0x2a0 net/netfilter/nf_conntrack_netlink.c:924 [<00000000745f0fc9>] ctnetlink_flush_conntrack net/netfilter/nf_conntrack_netlink.c:1516 [inline] [<00000000745f0fc9>] ctnetlink_del_conntrack+0x20a/0x326 net/netfilter/nf_conntrack_netlink.c:1554 [<00000000385a38da>] nfnetlink_rcv_msg+0x32f/0x370 net/netfilter/nfnetlink.c:229 [<00000000bb3b1fc1>] netlink_rcv_skb+0x5a/0x180 net/netlink/af_netlink.c:2469 [<00000000b2799dbb>] nfnetlink_rcv+0x83/0x1b0 net/netfilter/nfnetlink.c:563 [<000000006021f56a>] netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] [<000000006021f56a>] netlink_unicast+0x20a/0x2f0 net/netlink/af_netlink.c:1329 [<000000003a4cd173>] netlink_sendmsg+0x2b5/0x560 net/netlink/af_netlink.c:1918 [<00000000ff287393>] sock_sendmsg_nosec net/socket.c:652 [inline] [<00000000ff287393>] sock_sendmsg+0x4c/0x60 net/socket.c:672 [<000000008c32b330>] ____sys_sendmsg+0x2c4/0x2f0 net/socket.c:2352 [<00000000a8f57b1b>] ___sys_sendmsg+0x8a/0xd0 net/socket.c:2406 [<000000002c938bcf>] __sys_sendmsg+0x77/0xe0 net/socket.c:2439 [<00000000878f0bd0>] do_syscall_64+0x6e/0x220 arch/x86/entry/common.c:295 [<00000000dcd0e014>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 BUG: memory leak unreferenced object 0xffff88811ac32a00 (size 128): comm "syz-executor470", pid 6432, jiffies 4294946459 (age 7.710s) hex dump (first 32 bytes): 00 00 00 00 02 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<00000000da2809df>] kmalloc include/linux/slab.h:555 [inline] [<00000000da2809df>] kzalloc include/linux/slab.h:669 [inline] [<00000000da2809df>] ctnetlink_alloc_filter+0x3a/0x2a0 net/netfilter/nf_conntrack_netlink.c:924 [<00000000745f0fc9>] ctnetlink_flush_conntrack net/netfilter/nf_conntrack_netlink.c:1516 [inline] [<00000000745f0fc9>] ctnetlink_del_conntrack+0x20a/0x326 net/netfilter/nf_conntrack_netlink.c:1554 [<00000000385a38da>] nfnetlink_rcv_msg+0x32f/0x370 net/netfilter/nfnetlink.c:229 [<00000000bb3b1fc1>] netlink_rcv_skb+0x5a/0x180 net/netlink/af_netlink.c:2469 [<00000000b2799dbb>] nfnetlink_rcv+0x83/0x1b0 net/netfilter/nfnetlink.c:563 [<000000006021f56a>] netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] [<000000006021f56a>] netlink_unicast+0x20a/0x2f0 net/netlink/af_netlink.c:1329 [<000000003a4cd173>] netlink_sendmsg+0x2b5/0x560 net/netlink/af_netlink.c:1918 [<00000000ff287393>] sock_sendmsg_nosec net/socket.c:652 [inline] [<00000000ff287393>] sock_sendmsg+0x4c/0x60 net/socket.c:672 [<000000008c32b330>] ____sys_sendmsg+0x2c4/0x2f0 net/socket.c:2352 [<00000000a8f57b1b>] ___sys_sendmsg+0x8a/0xd0 net/socket.c:2406 [<000000002c938bcf>] __sys_sendmsg+0x77/0xe0 net/socket.c:2439 [<00000000878f0bd0>] do_syscall_64+0x6e/0x220 arch/x86/entry/common.c:295 [<00000000dcd0e014>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 --- 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
