Hi All, I have 10 systems running 2.4 that are rock solid, but I have 1 system that has problems with 2.4. The box had run perfectly for 46 days with 2.2.19pre2, and today I installed 2.4.1-ac3 to see how it would go. It seemed to run fine for a few minutes, then the old problem reasserted itself: "df" gives a segmentation fault: iron: /root (tty/dev/pts/0): bash: 1040 > df Filesystem 1k-blocks Used Available Use% Mounted on /dev/hda1 1007960 457996 498760 48% / /dev/hda3 1198496 1082264 55352 96% /usr Segmentation fault Initial look at the oops implicates the sunrpc code. This is Red Hat 7.0 with all updates applied running on a humble pentium 166 (IBM model 350). The identical oops occurs whether the kernel is compiled with kgcc or gcc-2.96 . Hope this helps, jjs decoded ksymoops follows: ksymoops 2.3.4 on i586 2.4.1-ac3. Options used -V (default) -k /proc/ksyms (default) -l /proc/modules (default) -o /lib/modules/2.4.1-ac3/ (default) -m /boot/System.map (specified) Warning (compare_maps): ksyms_base symbol __VERSIONED_SYMBOL(shmem_file_setup) not found in System.map. Ignoring ksyms_base entry Unable to handle kernel paging request at virtual address feff3112 c482dab4 *pde = 00000000 Oops: 0000 CPU: 0 EIP: 0010:[<c482dab4>] Using defaults from ksymoops -t elf32-i386 -a i386 EFLAGS: 00010286 eax: feff310a ebx: feff310a ecx: 00000000 edx: c36c5b20 esi: c36ef610 edi: c36c5b20 ebp: 00000000 esp: c1d31d14 ds: 0018 es: 0018 ss: 0018 Process df (pid: 1305, stackpage=c1d31000) Stack: 08040016 c08c7300 40000000 c01b291e 00000000 c36c5b20 c36c5b20 c482db9a c36c5b20 c1d31da0 c36c5b20 c1d31dd4 c1d31d98 c482dc9f c36c5b20 00000000 c1d31da0 c1d31e80 c482951a c1d31da0 00000000 c1d31da0 c36efc10 c482940c Call Trace: [<c01b291e>] [<c482db9a>] [<c482dc9f>] [<c482951a>] [<c482940c>] [<c482bfc0>] [<c485f4a8>] [<c01e177a>] [<c4858aef>] [<c012c0da>] [<c012c125>] [<c0108e0b>] Code: 66 83 7b 08 00 75 15 a1 68 2a 29 c0 39 43 04 79 0b 8b 03 89 >>EIP; c482dab4 <[sunrpc]rpcauth_gc_credcache+2c/b0> <===== Trace; c01b291e <net_tx_action+96/a4> Trace; c482db9a <[sunrpc]rpcauth_lookup_credcache+36/8c> Trace; c482dc9f <[sunrpc]rpcauth_bindcred+3b/54> Trace; c482951a <[sunrpc]rpc_call_setup+36/64> Trace; c482940c <[sunrpc]rpc_call_sync+64/9c> Trace; c482bfc0 <[sunrpc]rpc_run_timer+0/44> Trace; c485f4a8 <[nfs]nfs_proc_statfs+58/7c> Trace; c01e177a <vsprintf+306/334> Trace; c4858aef <[nfs]nfs_statfs+33/180> Trace; c012c0da <vfs_statfs+3a/40> Trace; c012c125 <sys_statfs+45/f4> Trace; c0108e0b <system_call+33/38> Code; c482dab4 <[sunrpc]rpcauth_gc_credcache+2c/b0> 00000000 <_EIP>: Code; c482dab4 <[sunrpc]rpcauth_gc_credcache+2c/b0> <===== 0: 66 83 7b 08 00 cmpw $0x0,0x8(%ebx) <===== Code; c482dab9 <[sunrpc]rpcauth_gc_credcache+31/b0> 5: 75 15 jne 1c <_EIP+0x1c> c482dad0 <[sunrpc]rpcauth_gc_credcache+48/b0> Code; c482dabb <[sunrpc]rpcauth_gc_credcache+33/b0> 7: a1 68 2a 29 c0 mov 0xc0292a68,%eax Code; c482dac0 <[sunrpc]rpcauth_gc_credcache+38/b0> c: 39 43 04 cmp %eax,0x4(%ebx) Code; c482dac3 <[sunrpc]rpcauth_gc_credcache+3b/b0> f: 79 0b jns 1c <_EIP+0x1c> c482dad0 <[sunrpc]rpcauth_gc_credcache+48/b0> Code; c482dac5 <[sunrpc]rpcauth_gc_credcache+3d/b0> 11: 8b 03 mov (%ebx),%eax Code; c482dac7 <[sunrpc]rpcauth_gc_credcache+3f/b0> 13: 89 00 mov %eax,(%eax) Unable to handle kernel paging request at virtual address feff3112 c482dab4 *pde = 00000000 Oops: 0000 CPU: 0 EIP: 0010:[<c482dab4>] EFLAGS: 00010286 eax: 00010a9d ebx: feff310a ecx: 00000000 edx: c36c5b20 esi: 00000000 edi: c36c5b20 ebp: 00000000 esp: c1d31d14 ds: 0018 es: 0018 ss: 0018 Process df (pid: 1308, stackpage=c1d31000) Stack: 08048000 c08c7240 40000000 c1d31d4c 00000000 c36c5b20 c36c5b20 c482db9a c36c5b20 c1d31da0 c36c5b20 c1d31dd4 c1d31d98 c482dc9f c36c5b20 00000000 c1d31da0 c1d31e80 c482951a c1d31da0 00000000 c1d31da0 c36efc10 c482940c Call Trace: [<c482db9a>] [<c482dc9f>] [<c482951a>] [<c482940c>] [<c482bfc0>] [<c485f4a8>] [<c01e177a>] [<c4858aef>] [<c012c0da>] [<c012c125>] [<c0108e0b>] Code: 66 83 7b 08 00 75 15 a1 68 2a 29 c0 39 43 04 79 0b 8b 03 89 >>EIP; c482dab4 <[sunrpc]rpcauth_gc_credcache+2c/b0> <===== Trace; c482db9a <[sunrpc]rpcauth_lookup_credcache+36/8c> Trace; c482dc9f <[sunrpc]rpcauth_bindcred+3b/54> Trace; c482951a <[sunrpc]rpc_call_setup+36/64> Trace; c482940c <[sunrpc]rpc_call_sync+64/9c> Trace; c482bfc0 <[sunrpc]rpc_run_timer+0/44> Trace; c485f4a8 <[nfs]nfs_proc_statfs+58/7c> Trace; c01e177a <vsprintf+306/334> Trace; c4858aef <[nfs]nfs_statfs+33/180> Trace; c012c0da <vfs_statfs+3a/40> Trace; c012c125 <sys_statfs+45/f4> Trace; c0108e0b <system_call+33/38> Code; c482dab4 <[sunrpc]rpcauth_gc_credcache+2c/b0> 00000000 <_EIP>: Code; c482dab4 <[sunrpc]rpcauth_gc_credcache+2c/b0> <===== 0: 66 83 7b 08 00 cmpw $0x0,0x8(%ebx) <===== Code; c482dab9 <[sunrpc]rpcauth_gc_credcache+31/b0> 5: 75 15 jne 1c <_EIP+0x1c> c482dad0 <[sunrpc]rpcauth_gc_credcache+48/b0> Code; c482dabb <[sunrpc]rpcauth_gc_credcache+33/b0> 7: a1 68 2a 29 c0 mov 0xc0292a68,%eax Code; c482dac0 <[sunrpc]rpcauth_gc_credcache+38/b0> c: 39 43 04 cmp %eax,0x4(%ebx) Code; c482dac3 <[sunrpc]rpcauth_gc_credcache+3b/b0> f: 79 0b jns 1c <_EIP+0x1c> c482dad0 <[sunrpc]rpcauth_gc_credcache+48/b0> Code; c482dac5 <[sunrpc]rpcauth_gc_credcache+3d/b0> 11: 8b 03 mov (%ebx),%eax Code; c482dac7 <[sunrpc]rpcauth_gc_credcache+3f/b0> 13: 89 00 mov %eax,(%eax) Unable to handle kernel paging request at virtual address feff3112 c482dab4 *pde = 00000000 Oops: 0000 CPU: 0 EIP: 0010:[<c482dab4>] EFLAGS: 00010286 eax: 00010f52 ebx: feff310a ecx: 00000000 edx: c36c5b20 esi: 00000000 edi: c36c5b20 ebp: 00000000 esp: c2cd5d14 ds: 0018 es: 0018 ss: 0018 Process df (pid: 1315, stackpage=c2cd5000) Stack: 08048000 c0d6e1b0 40000000 00000014 00000000 c36c5b20 c36c5b20 c482db9a c36c5b20 c2cd5da0 c36c5b20 c2cd5dd4 c2cd5d98 c482dc9f c36c5b20 00000000 c2cd5da0 c2cd5e80 c482951a c2cd5da0 00000000 c2cd5da0 c36efc10 c482940c Call Trace: [<c482db9a>] [<c482dc9f>] [<c482951a>] [<c482940c>] [<c482bfc0>] [<c485f4a8>] [<c01e177a>] [<c4858aef>] [<c012c0da>] [<c012c125>] [<c0108e0b>] Code: 66 83 7b 08 00 75 15 a1 68 2a 29 c0 39 43 04 79 0b 8b 03 89 >>EIP; c482dab4 <[sunrpc]rpcauth_gc_credcache+2c/b0> <===== Trace; c482db9a <[sunrpc]rpcauth_lookup_credcache+36/8c> Trace; c482dc9f <[sunrpc]rpcauth_bindcred+3b/54> Trace; c482951a <[sunrpc]rpc_call_setup+36/64> Trace; c482940c <[sunrpc]rpc_call_sync+64/9c> Trace; c482bfc0 <[sunrpc]rpc_run_timer+0/44> Trace; c485f4a8 <[nfs]nfs_proc_statfs+58/7c> Trace; c01e177a <vsprintf+306/334> Trace; c4858aef <[nfs]nfs_statfs+33/180> Trace; c012c0da <vfs_statfs+3a/40> Trace; c012c125 <sys_statfs+45/f4> Trace; c0108e0b <system_call+33/38> Code; c482dab4 <[sunrpc]rpcauth_gc_credcache+2c/b0> 00000000 <_EIP>: Code; c482dab4 <[sunrpc]rpcauth_gc_credcache+2c/b0> <===== 0: 66 83 7b 08 00 cmpw $0x0,0x8(%ebx) <===== Code; c482dab9 <[sunrpc]rpcauth_gc_credcache+31/b0> 5: 75 15 jne 1c <_EIP+0x1c> c482dad0 <[sunrpc]rpcauth_gc_credcache+48/b0> Code; c482dabb <[sunrpc]rpcauth_gc_credcache+33/b0> 7: a1 68 2a 29 c0 mov 0xc0292a68,%eax Code; c482dac0 <[sunrpc]rpcauth_gc_credcache+38/b0> c: 39 43 04 cmp %eax,0x4(%ebx) Code; c482dac3 <[sunrpc]rpcauth_gc_credcache+3b/b0> f: 79 0b jns 1c <_EIP+0x1c> c482dad0 <[sunrpc]rpcauth_gc_credcache+48/b0> Code; c482dac5 <[sunrpc]rpcauth_gc_credcache+3d/b0> 11: 8b 03 mov (%ebx),%eax Code; c482dac7 <[sunrpc]rpcauth_gc_credcache+3f/b0> 13: 89 00 mov %eax,(%eax) 1 warning issued. 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