Messages in this thread | | | From | Godmar Back <> | Subject | oops in nfs_wback_result 2.2.3 | Date | Wed, 17 Mar 1999 17:12:03 -0700 (MST) |
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I got this oops while accessing a FreeBSD NFS server.
Mar 17 16:27:48 peerless kernel: Unable to handle kernel NULL pointer dereference at virtual address 00000008 Mar 17 16:27:48 peerless kernel: current->tss.cr3 = 00101000, pr3 = 00101000 Mar 17 16:27:48 peerless kernel: *pde = 00000000 Mar 17 16:27:48 peerless kernel: Oops: 0000 Mar 17 16:27:48 peerless kernel: CPU: 0 Mar 17 16:27:48 peerless kernel: EIP: 0010:[<c014cc2a>] Mar 17 16:27:48 peerless kernel: EFLAGS: 00010286 Mar 17 16:27:48 peerless kernel: eax: c014cc08 ebx: c435fc80 ecx: c435fc88 edx: 00000000 Mar 17 16:27:48 peerless kernel: esi: 00000000 edi: 00000001 ebp: c4fe1ec4 esp: c4741f98 Mar 17 16:27:48 peerless kernel: ds: 0018 es: 0018 ss: 0018 Mar 17 16:27:48 peerless kernel: Process rpciod (pid: 332, process nr: 27, stackpage=c4741000) Mar 17 16:27:48 peerless kernel: Stack: 00000001 00000000 c0314848 c017f930 c435fc88 c435fc88 00000000 00000000 Mar 17 16:27:48 peerless kernel: 00000001 c017fa25 c435fc88 00000001 c435fc88 00000001 00000000 c4740000 Mar 17 16:27:48 peerless kernel: c020191c c018010d 00000100 c47a9e2c c42e4f76 c4742000 c01075b7 c020191c Mar 17 16:27:48 peerless kernel: Call Trace: [<c017f930>] [<c017fa25>] [<c018010d>] [<c01075b7>] Mar 17 16:27:48 peerless kernel: Code: 8b 7a 08 f6 05 60 1a 20 c0 08 74 2a 0f b7 83 94 00 00 00 50 Warning: trailing garbage ignored on Code: line Text: 'Code: 8b 7a 08 f6 05 60 1a 20 c0 08 74 2a 0f b7 83 94 00 00 00 50 ' Garbage: ' '
>>EIP: c014cc2a <nfs_wback_result+22/188> Trace: c017f930 <__rpc_execute+1a8/1b4> Trace: c017fa25 <__rpc_schedule+89/cc> Trace: c018010d <rpciod+115/20c> Trace: c01075b7 <kernel_thread+23/30> Code: c014cc2a <nfs_wback_result+22/188> 00000000 <_EIP>: Code: c014cc2a <nfs_wback_result+22/188> 0: 8b 7a 08 movl 0x8(%edx),%edi Code: c014cc2d <nfs_wback_result+25/188> 3: f6 05 60 1a 20 testb $0x8,0xc0201a60 Code: c014cc32 <nfs_wback_result+2a/188> 8: c0 08 Code: c014cc34 <nfs_wback_result+2c/188> a: 74 2a je 36 <_EIP+0x36> c014cc60 <nfs_wback_result+58/188> Code: c014cc36 <nfs_wback_result+2e/188> c: 0f b7 83 94 00 movzwl 0x94(%ebx),%eax Code: c014cc3b <nfs_wback_result+33/188> 11: 00 00 Code: c014cc3d <nfs_wback_result+35/188> 13: 50 pushl %eax
4 warnings issued. Results may not be reliable.
From my reading of the code:
/* * 2. Collect the result */ static void nfs_wback_result(struct rpc_task *task) { struct nfs_wreq *req = (struct nfs_wreq *) task->tk_calldata; struct file *file = req->wb_file; struct page *page = req->wb_page; int status = task->tk_status; struct dentry *dentry = file->f_dentry; struct inode *inode = dentry->d_inode; ... }
which is compiled to:
nfs_wback_result: subl $4,%esp pushl %ebp pushl %edi pushl %esi pushl %ebx movl 24(%esp),%ecx movl 72(%ecx),%ebx movl 116(%ebx),%ebp movl 120(%ebx),%ecx movl %ecx,16(%esp) movl 24(%esp),%ecx movl 32(%ecx),%esi movl 8(%ebp),%edx movl 8(%edx),%edi <- oops b/c %edx == 0 testb $8,nfs_debug je .L2044 movzwl 148(%ebx),%eax pushl %eax
I'd guess that task->tk_calldata was null?
Anyway, what happened next was: Mar 17 16:28:03 peerless kernel: nfs: task 33087 can't get a request slot Mar 17 16:28:04 peerless kernel: nfs: task 33095 can't get a request slot Mar 17 16:29:58 peerless kernel: nfs: task 33493 can't get a request slot Mar 17 16:30:16 peerless kernel: nfs: task 33497 can't get a request slot
Then I tried to reboot, but it got stuck with:
NFS: Arghhh, stuck RPC requests!\n
So I reset it.
Hope that information is useful.
- Godmar
More random information: [root@peerless nfs]# cat /proc/modules ntfs 33880 2 (autoclean) opl3 10248 1 cs4232 2264 1 uart401 5644 1 [cs4232] ad1848 15180 1 [cs4232] sound 55656 0 [opl3 cs4232 uart401 ad1848] soundcore 2260 5 [sound] [root@peerless nfs]# cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 5 model name : Pentium II (Deschutes) stepping : 1 cpu MHz : 350.801384 cache size : 512 KB fdiv_bug : no hlt_bug : no sep_bug : no f00f_bug : no fpu : yes fpu_exception : yes cpuid level : 2 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 mmx osfxsr bogomips : 350.62
processor : 1 vendor_id : GenuineIntel cpu family : 6 model : 5 model name : Pentium II (Deschutes) stepping : 1 cpu MHz : 350.801384 cache size : 512 KB fdiv_bug : no hlt_bug : no sep_bug : no f00f_bug : no fpu : yes fpu_exception : yes cpuid level : 2 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 mmx osfxsr bogomips : 349.80
[root@peerless nfs]# cat /proc/version Linux version 2.2.3 (root@peerless.cs.utah.edu) (gcc version 2.7.2.3) #4 SMP Wed Mar 10 10:28:25 MST 1999
- Godmar
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