This has been fixed by 40493c5f2b0f124c9b2581e539bba14522e51269, which
is exactly the same diff as given here.
** Changed in: qemu
Status: New => Fix Committed
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https://bugs.launchpad.net/bugs/1643619
Title:
netlink broken on big-endian mips
Status in QEMU:
Fix Committed
Bug description:
Debian QEMU version 2.7.0, but the bug also appears in current git
master (commit c36ed06e9159)
As the summary says, netlink is completely broken on big-endian mips
running qemu-user.
Running 'ip route' from within a Debian chroot with QEMU simply hangs.
Running amd64 strace on qemu-mips-static shows that it's waiting for a
netlink response from the kernel which never comes.
[...]
[pid 11249] socket(AF_NETLINK, SOCK_RAW|SOCK_CLOEXEC, NETLINK_ROUTE) = 3
[pid 11249] setsockopt(3, SOL_SOCKET, SO_SNDBUF, [32768], 4) = 0
[pid 11249] setsockopt(3, SOL_SOCKET, SO_RCVBUF, [1048576], 4) = 0
[pid 11249] bind(3, {sa_family=AF_NETLINK, nl_pid=0, nl_groups=00000000}, 12)
= 0
[pid 11249] getsockname(3, {sa_family=AF_NETLINK, nl_pid=11249,
nl_groups=00000000}, [12]) = 0
[pid 11249] time([1479745823]) = 1479745823
[pid 11249] sendto(3, {{len=671088640, type=0x1a00 /* NLMSG_??? */,
flags=NLM_F_REQUEST|NLM_F_MULTI|0x100, seq=539046744, pid=0},
"\2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\10\0\35\0\0\0\1"}, 40, 0, NULL, 0) = 40
[pid 11249] recvmsg(3,
Notice the len in the buffer passed to the kernel is 0x28000000 which
looks byteswapped.
Removing the call to fd_trans_unregister in the NR_socket syscall in
do_syscall fixes this for me, but I don't understand why the fd
translation was immediately unregistered after being registered just
before in do_socket - presumably it was added for a reason.
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -9331,7 +9331,6 @@ abi_long do_syscall(void *cpu_env, int num, abi_long
arg1,
#ifdef TARGET_NR_socket
case TARGET_NR_socket:
ret = do_socket(arg1, arg2, arg3);
- fd_trans_unregister(ret);
break;
#endif
#ifdef TARGET_NR_socketpair
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