From: Garrick Staples <garrick@usc.edu>
Subject: mountd segfault on itanium2
Date: Fri, 30 Apr 2004 14:24:14 -0700
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Hi all,
   I'm having a terrible time with mountd segfaulting on two Itanium boxes.=
  I
can't find a specific trigger, but I can generally trigger it within a few
minutes by just calling mount/umount a few hundred times.

I'm using glibc 2.3.2 and nfs-utils 1.0.6 from RHE.

In the tests below, I have a single directory exported to 10.125.0.0/16.  S=
ince
I know name resolution was a recent problem, I've made sure all clients are=
 in
/etc/hosts.  I'm using NIS, but files is before dns and nis in nsswitch.con=
f.
I've also tested with and without nscd running.

Thanks in advance for any help.


gdb isn't showing much in a backtrace, but I can supply a core if anyone wa=
nts
it.

# gdb --core=3D/var/lib/nfs/core.15841
=2E..
This GDB was configured as "ia64-redhat-linux-gnu".
Core was generated by `./mountd -F -d all'.
Program terminated with signal 11, Segmentation fault.
#0  0x20000008002c19d0 in ?? ()
(gdb) bt
#0  0x20000008002c19d0 in ?? ()
#1  0x20000008002c1950 in ?? ()
Previous frame identical to this frame (corrupt stack?)


I have a few different straces that show the segfault happening in different
places in the code:

open("/proc/fs/nfsd/filehandle", O_RDWR) =3D 9
fstat(9, {st_mode=3DS_IFREG|0600, st_size=3D0, ...}) =3D 0
mmap(NULL, 65536, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
=3D
0x2000000800440000
write(9, "10.125.0.0/16 /export/usc-01 64 "..., 33) =3D 33
read(9, "\\x010000000008001102000000\n", 16384) =3D 27
close(9)                                =3D 0
munmap(0x2000000800440000, 65536)       =3D 0
brk(0)                                  =3D 0x2000000800038000
sendmsg(6, {msg_name(16)=3D{sa_family=3DAF_INET, sin_port=3Dhtons(641),
sin_addr=3Dinet_addr("10.125.1.176")},
msg_iov(1)=3D[{"#\246?\315\0\0\0\1\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"...,=
 56}],
msg_controllen=3D32, msg_control=3D0x2000000800341dd8, , msg_flags=3D0}, 0)=
 =3D 56
select(1024, [3 4 5 6 7], NULL, NULL, NULL) =3D 2 (in [5 6])
read(5, "", 0)                          =3D 0
--- SIGSEGV (Segmentation fault) @ 20000008002c19d0 (63742f3132353111) ---


open("/var/lib/nfs/rmtab", O_RDWR)      =3D 10
fstat(10, {st_mode=3DS_IFREG|0644, st_size=3D6445, ...}) =3D 0
mmap(NULL, 65536, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
=3D
0x200000000037c000
lseek(10, 0, SEEK_CUR)                  =3D 0
read(10, "10.125.1.10:10.125.0.0/16:0x0000"..., 16384) =3D 6445
lseek(10, 6445, SEEK_SET)               =3D 6445
lseek(10, -4678, SEEK_CUR)              =3D 1767
write(10, "10.125.0.0/16:/export/usc-01:0x0"..., 40) =3D 40
fdatasync(10)                           =3D 0
close(10)                               =3D 0
munmap(0x200000000037c000, 65536)       =3D 0
close(8)                                =3D 0
gettimeofday({1083357502, 998698}, NULL) =3D 0
write(5, "10.125.0.0/16 0 \\x00080011020000"..., 62) =3D 62
--- SIGSEGV (Segmentation fault) @ 20000000002899d0 (7064752f35343639) ---

--=20
Garrick Staples, Linux/HPCC Administrator
University of Southern California

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