Re: NFS bug?

["Robert Merrill" <grievre@gmail.com>]

On 4/20/06, Trond Myklebust <trond.myklebust@fys.uio.no> wrote:
>
> Given that you are reporting an error with copy_from_user, then it is
> _definitely_ of interest to figure out what your glibc is telling the
> kernel to copy.

execve("./a.out", ["./a.out", "foo"], [/* 16 vars */]) = 0
uname({sys="Linux", node="soda", ...})  = 0
brk(0)                                  = 0x804a000
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
old_mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS,
-1, 0) = 0xb7f5f000
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY)      = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=20397, ...}) = 0
old_mmap(NULL, 20397, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7f5a000
close(3)                                = 0
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
open("/lib/tls/libc.so.6", O_RDONLY)    = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\260O\1"..., 512) = 512
fstat64(3, {st_mode=S_IFREG|0755, st_size=1270928, ...}) = 0
old_mmap(NULL, 1276892, PROT_READ|PROT_EXEC,
MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0xb7e22000
old_mmap(0xb7f50000, 32768, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x12e000) = 0xb7f50000
old_mmap(0xb7f58000, 7132, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xb7f58000
close(3)                                = 0
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS,
-1, 0) = 0xb7e21000
mprotect(0xb7f50000, 20480, PROT_READ)  = 0
set_thread_area({entry_number:-1 -> 6, base_addr:0xb7e218e0,
limit:1048575, seg_32bit:1, contents:0, read_exec_only:0,
limit_in_pages:1, seg_not_present:0, useable:1}) = 0
munmap(0xb7f5a000, 20397)               = 0
open("foo", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY) = 3
fstat64(3, {st_mode=S_IFDIR|0666, st_size=512, ...}) = 0
fcntl64(3, F_SETFD, FD_CLOEXEC)         = 0
brk(0)                                  = 0x804a000
brk(0x806f000)                          = 0x806f000
fstat64(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 21), ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0) = 0xb7f5e000
write(1, "0\n", 20
)                      = 2
getdents64(3,  <unfinished ...>
+++ killed by SIGSEGV +++