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SubjectOops in rpc_depopulate with 2.5.62
Getting rpc/nfs bugs on at least two different machines I've seen
and reports of a third from Zwane - all look similar. Anyone got
any bright ideas?

M.

Unable to handle kernel NULL pointer dereference at virtual address 0000006c
printing eip:
c03415e2
*pde = 358d2001
*pte = 00000000
Oops: 0002
CPU: 1
EIP: 0060:[<c03415e2>] Not tainted
EFLAGS: 00010206
EIP is at rpc_depopulate+0x22/0xf0
eax: 00000000 ebx: f5133680 ecx: 0000006c edx: f50afc1c
esi: f50afbf4 edi: f50afbf4 ebp: f50afc08 esp: f50afbec
ds: 007b es: 007b ss: 0068
Process mount (pid: 1166, threadinfo=f50ae000 task=f5766d80)
Stack: c01562f0 00000000 f50afbf4 f50afbf4 f5133680 f5133680 f51c1e00 f50afc40
c0341af5 f5133680 f5117880 f7ff9800 f50afcec 00000000 f50afc34 00000010
00000001 00000000 f5982680 f50afcec 00000000 f50afc50 c0333066 f5982714
Call Trace:
[<c01562f0>] lookup_hash+0x70/0xa0
[<c0341af5>] rpc_rmdir+0x55/0x90
[<c0333066>] rpc_destroy_client+0x46/0x70
[<c03330db>] rpc_release_client+0x4b/0x60
[<c0337bc7>] rpc_release_task+0x1a7/0x1d0
[<c033754b>] __rpc_execute+0x35b/0x370
[<c011a980>] default_wake_function+0x0/0x20
[<c0333274>] rpc_call_sync+0x64/0xa0
[<c0333287>] rpc_call_sync+0x77/0xa0
[<c03366b0>] rpc_run_timer+0x0/0xa0
[<c033e5fb>] rpc_register+0xcb/0x100
[<c0110000>] mask_and_ack_8259A+0x10/0xf0
[<c0339d24>] svc_register+0x94/0x100
[<c0339944>] svc_create+0xd4/0xe0
[<c01c1fb8>] lockd_up+0x58/0x110
[<c01a63f4>] nfs_fill_super+0x374/0x3a0
[<c01a7e90>] nfs_get_sb+0x1f0/0x230
[<c0150052>] do_kern_mount+0x42/0xa0
[<c01631e6>] do_add_mount+0x76/0x150
[<c0133596>] __alloc_pages+0x76/0x2c0
[<c01634d7>] do_mount+0x147/0x160
[<c0163908>] sys_mount+0xa8/0x110
[<c010ae7b>] syscall_call+0x7/0xb

Code: f0 ff 48 6c 0f 88 70 09 00 00 f0 fe 0d 00 d2 44 c0 0f 88 6d

Seems to be crashing on the deference of:

down(&dir->i_sem);

in rpc_depopulate. But there's a big comment just above saying:

-----------------------
/*
* FIXME: This probably has races.
*/
static void
rpc_depopulate(struct dentry *parent)
{
struct inode *dir = parent->d_inode;
LIST_HEAD(head);
struct list_head *pos, *next;
struct dentry *dentry;

down(&dir->i_sem);

------------------

Looks like dir is NULL here ... might be dcache_rcu (a recent dcache_rcu
patch fixed the same file) or a race brought out by the changes.


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