Messages in this thread Patch in this message |  | | Date | Sun, 09 Sep 2001 01:56:01 +0200 | From | Olivier Molteni <> | Subject | OOPS in fs/locks.c linux 2.4.9 |
| |
Hi,
I'm using a Netapp F820C with Linux 2.4.9 kernel as client. When I do many concurrents acces with locking (a strongly modified vesrion of the cyrus imap deliver agent) I get Oops from kernel. The real problem for me is not the application but really that my kernel Oops when locking, it's just that with this apps I can reproduct the bug
each time I try.
I have been looking in kernel archives and news, but I can't find anything that help me... I've tried the ac9 kernel which includes several NFS updates, but unsuccesfully ! I've tryed to mount the filer in NFSV2 and got the same result...
I've seen with ksymoops that the function that is in cause is locks_delete_lock in fs/locks.c
So I've logged it with printk and found that we entered in locks_delete_lock with fl == NULL
first I try a simple return if I detect a null fl. I worked (no more oops) but the problem is not solved, because the process stay blocked on IO (D) I would try to use the locks_wake_up_blocks(fl, wait); call, but as fl is set to NULL, I have no great hope about that !! So I have to find where the value of the calling fl is set to NULL and why ...
If somebody could help me, please, let me know !
Best regards, Olivier Molteni.
The NetApp system revision is : NetApp Release 6.1.1: Tue Jul 17 03:24:50 PDT 2001
The Oops message is: Unable to handle kernel NULL pointer dereference at virtual address 00000000 printing eip: c013d6e7 *pde = 00000000 Oops: 0000 CPU: 0 EIP: 0010:[<c013d6e7>] EFLAGS: 00010296 eax: 00000000 ebx: 00000000 ecx: 00000000 edx: f7d77960 esi: 00000004 edi: 00000001 ebp: bfffdb2c esp: c626ff74 ds: 0018 es: 0018 ss: 0018 Process cyrdeliver (pid: 15652, stackpage=c626f000) Stack: f7d77960 ed00eac0 c013f048 f7d77960 00000000 ecc895c0 00000000 c012e3f5 ecc895c0 ed00eac0 00000000 ecc895c0 00000000 ecc895c0 bfffbb2c c012e447 ecc895c0 ed00eac0 c626e000 c0106d2b 00000004 00000004 bfffcb2c bfffbb2c Call Trace: [<c013f048>] [<c012e3f5>] [<c012e447>] [<c0106d2b>]
Code: 8b 03 89 02 c7 03 00 00 00 00 8b 56 04 8b 43 04 89 50 04 89
When decoding with ksymoops I got:
ksymoops 2.3.4 on i686 2.4.9-ac10. Options used -v vmlinux.1 (specified) -K (specified) -L (specified) -O (specified) -m System.map.1 (specified)
Unable to handle kernel NULL pointer dereference at virtual address 00000000 c013d6e7 *pde = 00000000 Oops: 0000 CPU: 0 EIP: 0010:[<c013d6e7>] Using defaults from ksymoops -t elf32-i386 -a i386 EFLAGS: 00010296 eax: 00000000 ebx: 00000000 ecx: 00000000 edx: f7d77960 esi: 00000004 edi: 00000001 ebp: bfffdb2c esp: c626ff74 ds: 0018 es: 0018 ss: 0018 Process cyrdeliver (pid: 15652, stackpage=c626f000) Stack: f7d77960 ed00eac0 c013f048 f7d77960 00000000 ecc895c0 00000000 c012e3f5 ecc895c0 ed00eac0 00000000 ecc895c0 00000000 ecc895c0 bfffbb2c c012e447 ecc895c0 ed00eac0 c626e000 c0106d2b 00000004 00000004 bfffcb2c bfffbb2c Call Trace: [<c013f048>] [<c012e3f5>] [<c012e447>] [<c0106d2b>] Code: 8b 03 89 02 c7 03 00 00 00 00 8b 56 04 8b 43 04 89 50 04 89
>>EIP; c013d6e7 <locks_delete_lock+b/e8> <===== Trace; c013f048 <locks_remove_posix+58/6c> Trace; c012e3f5 <filp_close+55/64> Trace; c012e447 <sys_close+43/54> Trace; c0106d2b <system_call+33/38> Code; c013d6e7 <locks_delete_lock+b/e8> 00000000 <_EIP>: Code; c013d6e7 <locks_delete_lock+b/e8> <===== 0: 8b 03 mov (%ebx),%eax <===== Code; c013d6e9 <locks_delete_lock+d/e8> 2: 89 02 mov %eax,(%edx) Code; c013d6eb <locks_delete_lock+f/e8> 4: c7 03 00 00 00 00 movl $0x0,(%ebx) Code; c013d6f1 <locks_delete_lock+15/e8> a: 8b 56 04 mov 0x4(%esi),%edx Code; c013d6f4 <locks_delete_lock+18/e8> d: 8b 43 04 mov 0x4(%ebx),%eax Code; c013d6f7 <locks_delete_lock+1b/e8> 10: 89 50 04 mov %edx,0x4(%eax) Code; c013d6fa <locks_delete_lock+1e/e8> 13: 89 00 mov %eax,(%eax)
I have tryed these patchs: 2.4.9-ac9 2.4.0-ac10
This one from marc.theaimsgroup.com/?l=linux-kernel&m=99994077910602&w=2
--- fs/locks.c Fri Sep 7 23:06:49 2001 +++ fs/locks.c.new Sat Sep 8 01:03:50 2001 @@ -698,6 +698,9 @@ struct file_lock *new_fl = locks_alloc_lock(0); int error;
+ if (new_fl == NULL) + return -ENOMEM; + new_fl->fl_owner = current->files; new_fl->fl_pid = current->pid; new_fl->fl_file = filp;
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
|  |