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SubjectRe: NFS related Oops in 2.4.[39]-xfs
Date
From

Where did you get your kernel (the 2.4.9 version that is) this problem
sounds familiar, but I am pretty sure we fixed this case in XFS somewhere
between 2.4.3 and 2.4.9.

Steve

> noisy:/usr/src/linux # uname -a
> Linux noisy 2.4.3-XFS #8 SMP Sam Mai 19 18:21:36 CEST 2001 i686 unknown
>
> dual board with just one processor
> /usr/local and /home on LogicalVolumes
> tried also 2.4.9-XFS (but see below)
>
> ------------ oops -------------
> Warning (compare_maps): ksyms_base symbol __rta_fill_R__ver___rta_fill not fo
> und in
> System.map. Ignoring ksyms_base entry
> [other warnings stripped]
> Oops: 0000
> CPU: 0
> EIP: 0010:<c016b3c4>
> Using defaults from ksymoops -t elf32-i386 -a i386
> EFLAGS: 00010246
> eax: 00000000 ebx: 00000000 ecx: cff805b8 edx: 00000010
> esi: ca018260 edi: ca0182e0 ebp: cb9e5800 esp: cb9edeec
> ds: 0018 es: 0018 ss: 0018
> Stack: 0100708b ca018360 c016b7d8 ca0182e0 00000002 cba07000 cb9efc00 cb9e580
> 0
> ce078bc4 ca018360 00000000 ca018360 c016bb70 ce078a80 0102a048 0000000
> 5
> Call Trace: <c01bb7d8> <c016bb70> <c016a0b5>c0169b73> <c02a60bf> <c016999d> <
> c01054c4>
> Code: 8b 40 10 39 d0 74 21 8d 58 c8 39 f3 75 06 8b 5a 04 83 c3 c8
>
> >>EIP; c016b3c4 <nfsd_findparent+78/e8> <=====
> Trace; c01bb7d8 <xfs_buf_item_bits+38/58>
> Trace; c016bb70 <fh_verify+26c/48c>
> Trace; c016a0b5 <nfsd_proc_getattr+91/98>
> Code; c016b3c4 <nfsd_findparent+78/e8>
> 00000000 <_EIP>:
> Code; c016b3c4 <nfsd_findparent+78/e8> <=====
> 0: 8b 40 10 mov 0x10(%eax),%eax <=====
> Code; c016b3c7 <nfsd_findparent+7b/e8>
> 3: 39 d0 cmp %edx,%eax
> Code; c016b3c9 <nfsd_findparent+7d/e8>
> 5: 74 21 je 28 <_EIP+0x28> c016b3ec <nfsd_findpa
> rent+a0/e8>
> Code; c016b3cb <nfsd_findparent+7f/e8>
> 7: 8d 58 c8 lea 0xffffffc8(%eax),%ebx
> Code; c016b3ce <nfsd_findparent+82/e8>
> a: 39 f3 cmp %esi,%ebx
> Code; c016b3d0 <nfsd_findparent+84/e8>
> c: 75 06 jne 14 <_EIP+0x14> c016b3d8 <nfsd_findpa
> rent+8c/e8>
> Code; c016b3d2 <nfsd_findparent+86/e8>
> e: 8b 5a 04 mov 0x4(%edx),%ebx
> Code; c016b3d5 <nfsd_findparent+89/e8>
> 11: 83 c3 c8 add $0xffffffc8,%ebx
>
>
> 31 warnings issued. Results may not be reliable.
> ------------ oops -------------
>
> Why do I get all those warnings about symbol mismatch?
>
>
> The code causing the Oops:
>
> struct dentry *nfsd_findparent(struct dentry *child)
> {
> struct dentry *tdentry, *pdentry;
> tdentry = d_alloc(child, &(const struct qstr) {"..", 2, 0});
> if (!tdentry)
> return ERR_PTR(-ENOMEM);
>
> /* I'm going to assume that if the returned dentry is different, then
> * it is well connected. But nobody returns different dentrys do the
> y?
> */
> pdentry = child->d_inode->i_op->lookup(child->d_inode, tdentry);
> d_drop(tdentry); /* we never want ".." hashed */
> if (!pdentry) {
> /* I don't want to return a ".." dentry.
> * I would prefer to return an unconnected "IS_ROOT" dentry,
> * though a properly connected dentry is even better
> */
> /* if first or last of alias list is not tdentry, use that
> * else make a root dentry
> */
> struct list_head *aliases = &tdentry->d_inode->i_dentry;
> spin_lock(&dcache_lock);
> if (aliases->next != aliases) { <=========== CRASH
> !!!!!!!!!!!!!!!!!!!!!!!
> pdentry = list_entry(aliases->next, struct dentry, d_
> alias);
> if (pdentry == tdentry)
> pdentry = list_entry(aliases->prev, struct de
> ntry,
> d_alias);
> if (pdentry == tdentry)
> pdentry = NULL;
> if (pdentry) dget_locked(pdentry);
> }
> spin_unlock(&dcache_lock);
> if (pdentry == NULL) {
> pdentry = d_alloc_root(igrab(tdentry->d_inode));
> if (pdentry) {
> pdentry->d_flags |= DCACHE_NFSD_DISCONNECTED;
> d_rehash(pdentry);
> }
> }
> if (pdentry == NULL)
> pdentry = ERR_PTR(-ENOMEM);
> }
> dput(tdentry); /* it is not hashed, it will be discarded */
> return pdentry;
> }
>
>
> (gdb) disass nfsd_findparent
> Dump of assembler code for function nfsd_findparent:
> 0xc016b34c <nfsd_findparent>: push %esi
> 0xc016b34d <nfsd_findparent+1>: push %ebx
> 0xc016b34e <nfsd_findparent+2>: mov 0xc(%esp,1),%ebx
> 0xc016b352 <nfsd_findparent+6>: push $0xc02ce724
> 0xc016b357 <nfsd_findparent+11>: push %ebx
> 0xc016b358 <nfsd_findparent+12>: call 0xc0144608 <d_alloc>
> 0xc016b35d <nfsd_findparent+17>: mov %eax,%esi
> 0xc016b35f <nfsd_findparent+19>: add $0x8,%esp
> tdentry = d_alloc(child, &(const struct qstr) {"..", 2, 0});
>
> 0xc016b362 <nfsd_findparent+22>: test %esi,%esi
> if (!tdentry)
> 0xc016b364 <nfsd_findparent+24>: jne 0xc016b370 <nfsd_findparent+36
> >
> 0xc016b366 <nfsd_findparent+26>: mov $0xfffffff4,%eax
> 0xc016b36b <nfsd_findparent+31>: jmp 0xc016b431 <nfsd_findparent+22
> 9>
> return ERR_PTR(-ENOMEM);
>
>
> 0xc016b370 <nfsd_findparent+36>: mov 0x8(%ebx),%eax
> 0xc016b373 <nfsd_findparent+39>: mov 0x84(%eax),%edx
> 0xc016b379 <nfsd_findparent+45>: push %esi
> 0xc016b37a <nfsd_findparent+46>: push %eax
> 0xc016b37b <nfsd_findparent+47>: mov 0x4(%edx),%eax
> 0xc016b37e <nfsd_findparent+50>: call *%eax
> 0xc016b380 <nfsd_findparent+52>: mov %eax,%ebx
> 0xc016b382 <nfsd_findparent+54>: add $0x8,%esp
> pdentry = child->d_inode->i_op->lookup(child->d_inode, tdentry);
>
> static __inline__ void d_drop(struct dentry * dentry)
> {
> spin_lock(&dcache_lock);
> list_del(&dentry->d_hash);
> INIT_LIST_HEAD(&dentry->d_hash);
> spin_unlock(&dcache_lock);
> }
>
> 0xc016b385 <nfsd_findparent+57>: lock decb 0xc0329898
> 0xc016b38c <nfsd_findparent+64>: js 0xc02aefa4 <stext_lock+12548>
> 0xc016b392 <nfsd_findparent+70>: lea 0x18(%esi),%eax
> 0xc016b395 <nfsd_findparent+73>: mov 0x4(%eax),%ecx
> 0xc016b398 <nfsd_findparent+76>: mov 0x18(%esi),%edx
> 0xc016b39b <nfsd_findparent+79>: mov %ecx,0x4(%edx)
> 0xc016b39e <nfsd_findparent+82>: mov %edx,(%ecx)
> 0xc016b3a0 <nfsd_findparent+84>: mov %eax,0x18(%esi)
> 0xc016b3a3 <nfsd_findparent+87>: mov %eax,0x1c(%esi)
> 0xc016b3a6 <nfsd_findparent+90>: movb $0x1,0xc0329898
>
> d_drop(tdentry); /* we never want ".." hashed */
>
>
> 0xc016b3ad <nfsd_findparent+97>: test %ebx,%ebx
> 0xc016b3af <nfsd_findparent+99>: jne 0xc016b426 <nfsd_findparent+21
> 8>
> if (!pdentry) {
>
> 0xc016b3b1 <nfsd_findparent+101>: mov 0x8(%esi),%eax
> 0xc016b3b4 <nfsd_findparent+104>: lea 0x10(%eax),%edx // edx holds
> aliases
> struct list_head *aliases = &tdentry->d_inode->i_dentry;
>
> // is tdentry->d_inode->i_dentry not valid anymore? aliases ge
> ts NULL
>
>
> 0xc016b3b7 <nfsd_findparent+107>: lock decb 0xc0329898
> 0xc016b3be <nfsd_findparent+114>: js 0xc02aefb4 <stext_lock+12564>
> spin_lock(&dcache_lock);
>
> 0xc016b3c4 <nfsd_findparent+120>: mov 0x10(%eax),%eax <==========
> ===========
> CRASH !!!
> 0xc016b3c7 <nfsd_findparent+123>: cmp %edx,%eax // eax holds alias
> es->next
> if (aliases->next != aliases) {
>
> 0xc016b3c9 <nfsd_findparent+125>: je 0xc016b3ec <nfsd_findparent+16
> 0>
> 0xc016b3cb <nfsd_findparent+127>: lea 0xffffffc8(%eax),%ebx
> pdentry = list_entry(aliases->next, struct dentry, d_
> alias);
>
> 0xc016b3ce <nfsd_findparent+130>: cmp %esi,%ebx
> 0xc016b3d0 <nfsd_findparent+132>: jne 0xc016b3d8 <nfsd_findparent+14
> 0>
> 0xc016b3d2 <nfsd_findparent+134>: mov 0x4(%edx),%ebx
> 0xc016b3d5 <nfsd_findparent+137>: add $0xffffffc8,%ebx
>
> 0xc016b3d8 <nfsd_findparent+140>: xor %eax,%eax
> 0xc016b3da <nfsd_findparent+142>: cmp %esi,%ebx
> 0xc016b3dc <nfsd_findparent+144>: cmove %eax,%ebx
> 0xc016b3df <nfsd_findparent+147>: test %ebx,%ebx
> 0xc016b3e1 <nfsd_findparent+149>: je 0xc016b3ec <nfsd_findparent+16
> 0>
> 0xc016b3e3 <nfsd_findparent+151>: push %ebx
> 0xc016b3e4 <nfsd_findparent+152>: call 0xc0144080 <dget_locked>
> 0xc016b3e9 <nfsd_findparent+157>: add $0x4,%esp
> if (pdentry) dget_locked(pdentry);
>
> 0xc016b3ec <nfsd_findparent+160>: movb $0x1,0xc0329898
> 0xc016b3f3 <nfsd_findparent+167>: test %ebx,%ebx
> 0xc016b3f5 <nfsd_findparent+169>: jne 0xc016b41c <nfsd_findparent+20
> 8>
> spin_unlock(&dcache_lock);
>
> 0xc016b3f7 <nfsd_findparent+171>: mov 0x8(%esi),%eax
> 0xc016b3fa <nfsd_findparent+174>: push %eax
> 0xc016b3fb <nfsd_findparent+175>: call 0xc0145ee8 <igrab>
> 0xc016b400 <nfsd_findparent+180>: push %eax
> 0xc016b401 <nfsd_findparent+181>: call 0xc01447f4 <d_alloc_root>
> 0xc016b406 <nfsd_findparent+186>: mov %eax,%ebx
> 0xc016b408 <nfsd_findparent+188>: add $0x8,%esp
> pdentry = d_alloc_root(igrab(tdentry->d_inode));
>
> 0xc016b40b <nfsd_findparent+191>: test %ebx,%ebx
> 0xc016b40d <nfsd_findparent+193>: je 0xc016b41c <nfsd_findparent+20
> 8>
> 0xc016b40f <nfsd_findparent+195>: orb $0x4,0x4(%ebx)
> 0xc016b413 <nfsd_findparent+199>: push %ebx
> 0xc016b414 <nfsd_findparent+200>: call 0xc0144ab4 <d_rehash>
> 0xc016b419 <nfsd_findparent+205>: add $0x4,%esp
> 0xc016b41c <nfsd_findparent+208>: mov $0xfffffff4,%eax
> 0xc016b421 <nfsd_findparent+213>: test %ebx,%ebx
> 0xc016b423 <nfsd_findparent+215>: cmove %eax,%ebx
> 0xc016b426 <nfsd_findparent+218>: push %esi
> } /* if (!pdentry) */
> 0xc016b427 <nfsd_findparent+219>: call 0xc0143e90 <dput>
> 0xc016b42c <nfsd_findparent+224>: mov %ebx,%eax
> 0xc016b42e <nfsd_findparent+226>: add $0x4,%esp
> 0xc016b431 <nfsd_findparent+229>: pop %ebx
> 0xc016b432 <nfsd_findparent+230>: pop %esi
> 0xc016b433 <nfsd_findparent+231>: ret
> End of assembler dump.
> (gdb)
>
>
> 2.4.3-xfs is compiled with gcc 2.95.2
> 2.4.9-XFS is compiled with gcc 2.91.6
>
> After the crash I tried to reboot, but it quickly failed again.
> reboot system boot 2.4.3-XFS Mon Oct 15 18:20 (21:49)
> reboot system boot 2.4.3-XFS Mon Oct 15 18:17 (21:52)
> reboot system boot 2.4.3-XFS Mon Oct 15 18:13 (21:57)
>
> reboot system boot 2.4.3-XFS Thu Oct 11 16:51 (4+23:18)
> reboot system boot 2.4.3-XFS Thu Oct 11 16:32 (4+23:37)
> reboot system boot 2.4.3-XFS Thu Oct 11 16:28 (4+23:41)
> reboot system boot 2.4.3-XFS Thu Oct 11 16:23 (4+23:46)
> reboot system boot 2.4.3-XFS Thu Oct 11 16:12 (4+23:57)
> reboot system boot 2.4.3-XFS Thu Oct 11 15:05 (5+01:04)
>
> reboot system boot 2.4.9-xfs Thu Oct 4 17:02 (11+23:08)
> reboot system boot 2.4.9-xfs Thu Oct 4 16:54 (11+23:15)
> reboot system boot 2.4.3-XFS Thu Oct 4 16:47 (11+23:23)
> reboot system boot 2.4.9-xfs Thu Oct 4 16:39 (11+23:31)
> reboot system boot 2.4.9-xfs Thu Oct 4 16:14 (11+23:55)
>
>
> To recover I had to unplug/powerdown all connected clients. :-( Uhh.
> I think 2.4.9 crashed at the same instructions. But I can't reproduce
> it on demand (hey, in the meantime we can work!).
> Seeing the NFS related changes in 2.4.10: should I upgrade?
> We use only NFSv2. Is NFSv3 more stable, if that matters here?
>
> The machine with 2.4.3 was up for several months - with light load.
> Now the number of crashes (with 6 NFS clients using /home + cvs) went up.
>
> We do mount our compile environment in a strange way:
>
> NOTE: /server is a symlink to /usr/local/export
> # See exports(5) for a description.
> # This file contains a list of all directories exported to other computers.
> # It is used by rpc.nfsd and rpc.mountd.
> /opt/xxx *.xxx(ro)
> /home *.xxx(rw)
> /tmp *.xxx(rw)
> /usr/local/export *.xxx(rw)
>
>
> /etc/fstab
> devserv:/server/compileenv/lib/lib \
> /compenv/xxx/lib nfs ro,auto 0 0
> devserv:/server/compileenv/usr_lib/usr/lib \
> /compenv/xxx/usr_lib nfs ro,auto 0 0
> devserv:/server/compileenv/gcc-lib \
> /compenv/xxx/gcc-lib nfs ro,exec,auto 0 0
> devserv:/server/compileenv/usr_include/usr/include \
> /compenv/xxx/usr_include nfs ro,auto 0 0
> devserv:/server/compileenv/usr_linux/usr/linux/include \
> /compenv/xxx/usr_linux_include nfs ro,auto 0 0
>
> Would it help to mount a single /usr/local/export and work with a
> symlink tree (as I actually do with autofs) ?
> What can cause the "invalid" dentries? Did someone remove some files
> or were some dentries de'hashed because of dcache growth?
>
> As workaround I will do:
>
> struct list_head *aliases = &tdentry->d_inode->i_dentry;
>
> if (aliases && (aliases->next != aliases) ) {
> spin_lock(&dcache_lock);
> pdentry = list_entry(aliases->next, struct dentry, d_
> alias);
> if (pdentry == tdentry)
> pdentry = list_entry(aliases->prev, struct de
> ntry,
> d_alias);
> if (pdentry == tdentry)
> pdentry = NULL;
> if (pdentry) dget_locked(pdentry);
> spin_unlock(&dcache_lock);
> } else
> pdentry=NULL;
> -
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