[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] Re: Module Error
Hello Guys. Just to know. I found a workaround for this issue. I don't know why, but when running my device driver in a system with more than 2 cpus AND running with xen kernel, the driver hangs. The workaround consist in limiting the amount of CPUs during the boot: kernel /xen.gz vgamode=0x317 vgamode=0x317 vgamode=0x317 vgamode=0x317 maxcpus=2 After that, the module could run without problems. Thanks in advance. Att. Artur Baruchi On Sun, Oct 30, 2011 at 7:16 PM, Artur Baruchi <mail.baruchi@xxxxxxxxx> wrote: > Hi. > > Im writing a kernel module to extract some information from kernel, > the module is working really fine in an AMD (AMD Athlon(tm) 64 X2 Dual > Core Processor 3800+), but, when trying to run the module in a i7 > (Intel(R) Core(TM) i7 CPU 930 @ 2.80GHz) Im facing some strange errors > (see below). The kernel versions are just the same on both machines > (2.6.34.10-0.2-xen #1 SMP x86_64 x86_64 x86_64 GNU/Linux). The > difference are the amount of memory AND processor vendor. I noted that > the line of code that hangs my machine is this one: > > if(end->host==NULL) { > > The end->host points to an Inode type (end is an address_space type). > If I remove this line, the module works (but, obviously, do not return > what I want). I tried the same code in a kernel without xen > (2.6.34.10-0.2-desktop #1 SMP x86_64 x86_64 x86_64 GNU/Linux) and > worked fine, so I suppose that this error is due to something in Xen > running in a intel processor (I tried the module in an intel quad, and > got the same error). Follow some outputs: > > The error stack: > Oct 28 23:40:35 goku kernel: [ 4472.129718] BUG: unable to handle > kernel paging request at 000003d600000004 > Oct 28 23:40:35 goku kernel: [ 4472.129933] IP: [<ffffffffa08d118c>] > get_files+0x6c/0x220 [pagecache] > Oct 28 23:40:35 goku kernel: [ 4472.130098] PGD 0 > Oct 28 23:40:35 goku kernel: [ 4472.130250] Oops: 0000 [#4] SMP > Oct 28 23:40:35 goku kernel: [ 4472.130452] last sysfs file: > /sys/devices/system/cpu/cpu7/online > Oct 28 23:40:35 goku kernel: [ 4472.130562] CPU 0 > Oct 28 23:40:35 goku kernel: [ 4472.130615] Modules linked in: > pagecache ocfs2_dlmfs ocfs2_stack_o2cb ocfs2_dlm ocfs2_nodemanager > ocfs2_stackglue configfs drbd crc32c libcrc32c bridge stp llc nfsd > lockd nfs_acl snd_pcm_oss auth_rpcgss snd_mixer_oss usbbk gntdev netbk > blkbk blkback_pagemap blktap domctl xenbus_be snd_seq evtchn > snd_seq_device sunrpc exportfs edd fuse loop snd_hda_codec_realtek > firewire_ohci snd_hda_intel firewire_core snd_hda_codec crc_itu_t > snd_hwdep snd_pcm snd_timer ohci1394 iTCO_wdt snd soundcore sr_mod > xhci_hcd ieee1394 i2c_i801 iTCO_vendor_support pcspkr snd_page_alloc > sg r8169 wmi serio_raw ext4 jbd2 crc16 linear uhci_hcd sd_mod nouveau > ehci_hcd ttm drm_kms_helper usbcore drm agpgart i2c_algo_bit i2c_core > button dm_snapshot dm_mod xenblk cdrom xennet fan processor ata_piix > ahci pata_jmicron ata_generic libata scsi_mod thermal thermal_sys > hwmon > Oct 28 23:40:35 goku kernel: [ 4472.132037] > Oct 28 23:40:35 goku kernel: [ 4472.132037] Pid: 4641, comm: cat > Tainted: G D 2.6.34.10-0.2-xen #1 X58A-UD3R/X58A-UD3R > Oct 28 23:40:35 goku kernel: [ 4472.132037] RIP: > e030:[<ffffffffa08d118c>] [<ffffffffa08d118c>] get_files+0x6c/0x220 > [pagecache] > Oct 28 23:40:35 goku kernel: [ 4472.132037] RSP: e02b:ffff8801ded93c88 > EFLAGS: 00010246 > Oct 28 23:40:35 goku kernel: [ 4472.132037] RAX: 8000000004000400 RBX: > ffff8801e8ea5bd0 RCX: 0000000000000001 > Oct 28 23:40:35 goku kernel: [ 4472.132037] RDX: ffff8801efc8c7e8 RSI: > ffffffffa08d15c0 RDI: ffff8801e8ea4c28 > Oct 28 23:40:35 goku kernel: [ 4472.132037] RBP: 0000000000000001 R08: > ffff8801eed81e00 R09: 0000000000000000 > Oct 28 23:40:35 goku kernel: [ 4472.132037] R10: ffff8801e8ea5c00 R11: > 0000000000000000 R12: 00000000001e6000 > Oct 28 23:40:35 goku kernel: [ 4472.132037] R13: 0000000006a50000 R14: > ffff8801e8ea5b88 R15: 000003d600000004 > Oct 28 23:40:35 goku kernel: [ 4472.132037] FS: > 00007fcb81c3b700(0000) GS:ffff88000200b000(0000) > knlGS:0000000000000000 > Oct 28 23:40:35 goku kernel: [ 4472.132037] CS: e033 DS: 0000 ES: > 0000 CR0: 0000000080050033 > Oct 28 23:40:35 goku kernel: [ 4472.132037] CR2: 000003d600000004 CR3: > 00000001edecf000 CR4: 0000000000002660 > Oct 28 23:40:35 goku kernel: [ 4472.132037] DR0: 0000000000000000 DR1: > 0000000000000000 DR2: 0000000000000000 > Oct 28 23:40:35 goku kernel: [ 4472.132037] DR3: 0000000000000000 DR6: > 00000000ffff0ff0 DR7: 0000000000000400 > Oct 28 23:40:35 goku kernel: [ 4472.132037] Process cat (pid: 4641, > threadinfo ffff8801ded92000, task ffff8801eedfa780) > Oct 28 23:40:35 goku kernel: [ 4472.132037] Stack: > Oct 28 23:40:35 goku kernel: [ 4472.132037] 0000000101baa5b4 > 0000000200000002 0000000000000000 ffff8801f16ffae8 > Oct 28 23:40:35 goku kernel: [ 4472.132037] <0> 0000000000000000 > ffff8801ee7c6500 ffff8801efd32bc0 ffff8801e45de2d0 > Oct 28 23:40:35 goku kernel: [ 4472.132037] <0> ffff8801ee7c6500 > ffff8801f05d80f8 ffffffff801314f0 ffffffffa08d1349 > Oct 28 23:40:35 goku kernel: [ 4472.132037] Call Trace: > Oct 28 23:40:35 goku kernel: [ 4472.132037] [<ffffffffa08d1349>] > cache_open+0x9/0x20 [pagecache] > Oct 28 23:40:35 goku kernel: [ 4472.132037] [<ffffffff8016c529>] > proc_reg_open+0xb9/0x240 > Oct 28 23:40:35 goku kernel: [ 4472.132037] [<ffffffff8011060b>] > __dentry_open+0xeb/0x340 > Oct 28 23:40:35 goku kernel: [ 4472.132037] [<ffffffff801206a8>] > finish_open+0xe8/0x1c0 > Oct 28 23:40:35 goku kernel: [ 4472.132037] [<ffffffff80120f40>] > do_filp_open+0x1a0/0x630 > Oct 28 23:40:35 goku kernel: [ 4472.132037] [<ffffffff8011214a>] > do_sys_open+0x6a/0x140 > Oct 28 23:40:35 goku kernel: [ 4472.132037] [<ffffffff80007438>] > system_call_fastpath+0x16/0x1b > Oct 28 23:40:35 goku kernel: [ 4472.132037] [<00007fcb817a7130>] > 0x7fcb817a7130 > Oct 28 23:40:35 goku kernel: [ 4472.132037] Code: 03 05 69 9d f9 df 4c > 8b 78 18 4d 85 ff 0f 84 9c 00 00 00 41 f6 c7 01 0f 85 92 00 00 00 48 > 8b 00 a9 00 00 02 00 0f 85 84 00 00 00 <49> 8b 1f 48 85 db 0f 84 78 00 > 00 00 48 83 7b 40 00 74 71 4c 8b > Oct 28 23:40:35 goku kernel: [ 4472.132037] RIP [<ffffffffa08d118c>] > get_files+0x6c/0x220 [pagecache] > Oct 28 23:40:35 goku kernel: [ 4472.132037] RSP <ffff8801ded93c88> > Oct 28 23:40:35 goku kernel: [ 4472.132037] CR2: 000003d600000004 > Oct 28 23:40:35 goku kernel: [ 4472.143966] ---[ end trace a998217447e12d1d > ]--- > > Peace of code (simplified): > int init_module () { > > unsigned long pfn; > struct inode *ino; > unsigned char * c; > struct address_space *end; > struct dentry *dentry; > int fl; > > struct filepage * temp; > struct filepage *pos; > > for (pfn = 0; pfn < num_physpages; pfn++) { > struct page *page; > if (!pfn_valid(pfn)) > continue; > page = pfn_to_page(pfn); > if((page->mapping!=NULL) && (!PageAnon(page)) > && (!PageSwapCache(page))) { > end = page->mapping; > if(end->host==NULL) { <- > without this line, no hangs, but the > module returns wrong data to me... > printk(KERN_INFO > "Cool... found an valid inode \n"); > } > } > > } > return 0; > } > > Thanks in advance. > > Att. > Artur Baruchi > _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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