Package: libc6.1
Version: 2.3.5-6
Severity: minor
Hi,
On ia64, we keep getting kernel messages like this:
zsh(23995): unaligned access to 0x60000fffffffb264, ip=0x200000000040e8d1
zsh(23995): unaligned access to 0x60000fffffffb264, ip=0x200000000040e8d1
Running it through gdb reveals that lines 186 and 204 or nscd/nscd_helper.c
hold the issue:
char buf[CMSG_SPACE (sizeof (int))];
struct msghdr msg = { .msg_iov = iov, .msg_iovlen = 1,
.msg_control = buf, .msg_controllen = sizeof (buf) };
struct cmsghdr *cmsg = CMSG_FIRSTHDR (&msg);
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
186 cmsg->cmsg_len = CMSG_LEN (sizeof (int));
*(int *) CMSG_DATA (cmsg) = -1;
msg.msg_controllen = cmsg->cmsg_len;
if (TEMP_FAILURE_RETRY (__recvmsg (sock, &msg, 0)) != keylen)
goto out_close2;
mapfd = *(int *) CMSG_DATA (cmsg);
204 if (CMSG_FIRSTHDR (&msg)->cmsg_len != CMSG_LEN (sizeof (int)))
goto out_close;
struct stat64 st;
if (strcmp (resdata, key) != 0
The problem seems to be that, since it is a char array, buf is not necessarily
8-byte aligned, while it needs to be for ia64 to access the 8-byte wide
cmsg_len field.
Regards,
Samuel
-- System Information:
Debian Release: testing/unstable
APT prefers testing
APT policy: (990, 'testing'), (500, 'unstable'), (500, 'stable')
Architecture: ia64
Shell: /bin/sh linked to /bin/bash
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