Hi, I am running Debian 4.0 on a file-server, called bender, using NFS to serve the files, and a little while after I start to copy files to my server, my server's kernel oopses and the process on the client doing the copying hangs.
Using stock kernel. The kernel according to `uname -r`: 2.6.18-4-amd64 The message that I get on terminal: Message from [EMAIL PROTECTED] at Tue Dec 31 19:52:28 2002 ... bender kernel: Oops: 0000 [1] SMP Message from [EMAIL PROTECTED] at Tue Dec 31 19:52:28 2002 ... bender kernel: CR2: 0000000000000000 The gospel according to dmesg: Unable to handle kernel NULL pointer dereference at 0000000000000000 RIP: [<ffffffff802a749a>] page_to_pfn+0x0/0x33 PGD 1f6ab067 PUD 1f378067 PMD 0 Oops: 0000 [1] SMP CPU 0 Modules linked in: sha256 aes nfs lockd nfs_acl sunrpc ipv6 button ac battery xf s dm_crypt sbp2 loop tsdev snd_intel8x0 snd_ac97_codec snd_ac97_bus snd_pcm snd_ timer snd snd_page_alloc floppy psmouse parport_pc parport serio_raw i810_audio ac97_codec pcspkr i2c_nforce2 soundcore i2c_core evdev eth1394 ext3 jbd mbcache dm_mirror dm_snapshot dm_mod raid1 md_mod ide_generic sd_mod ide_cd cdrom sata_n v libata scsi_mod tg3 ohci1394 r8169 e1000 ieee1394 forcedeth generic amd74xx id e_core ehci_hcd ohci_hcd thermal processor fan Pid: 203, comm: pdflush Not tainted 2.6.18-4-amd64 #1 RIP: 0010:[<ffffffff802a749a>] [<ffffffff802a749a>] page_to_pfn+0x0/0x33 RSP: 0018:ffff81001fd317d8 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff810017de2140 RCX: 0000000000000000 RDX: 0000000000000014 RSI: ffff810017de2140 RDI: 0000000000000000 RBP: ffff810017e44000 R08: 0000000000000000 R09: ffff81001fc027f0 R10: 0000000000000246 R11: ffff810017d3edc0 R12: ffff810017de2140 R13: 0000000000000000 R14: 0000000000000000 R15: ffff81001f30cc98 FS: 00002b536bdd56d0(0000) GS:ffffffff80521000(0000) knlGS:0000000000000000 CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b CR2: 0000000000000000 CR3: 000000001f6aa000 CR4: 00000000000006e0 Process pdflush (pid: 203, threadinfo ffff81001fd30000, task ffff81001fc027f0) Stack: ffffffff8022bf96 ffff81001fc027f0 000000000000d400 0000000000000000 ffff810000000001 0000000000000001 ffff810017de2140 ffff81001f30cc98 ffff810017de2240 ffff810017c7aca8 0000000000000014 000000000000b000 Call Trace: [<ffffffff8022bf96>] blk_recount_segments+0x7e/0x21b [<ffffffff802bb9ae>] __bio_clone+0x71/0x8a [<ffffffff802bb9fc>] bio_clone+0x35/0x3d [<ffffffff882e476a>] :dm_crypt:crypt_map+0xcd/0x304 [<ffffffff881a82bf>] :dm_mod:__map_bio+0x47/0x9b [<ffffffff881a8c1f>] :dm_mod:__split_bio+0x172/0x37d [<ffffffff802200e5>] __up_read+0x13/0x8a [<ffffffff881a9432>] :dm_mod:dm_request+0x101/0x110 [<ffffffff80219f55>] generic_make_request+0x13a/0x14d [<ffffffff80231028>] submit_bio+0xcb/0xd2 [<ffffffff8022aa71>] __bio_add_page+0x154/0x1ce [<ffffffff8833bd8b>] :xfs:xfs_submit_ioend_bio+0x1e/0x27 [<ffffffff8833c7c3>] :xfs:xfs_page_state_convert+0xa2f/0xb6e [<ffffffff8833cb30>] :xfs:xfs_vm_writepage+0xa7/0xdd [<ffffffff8021ac61>] mpage_writepages+0x1a6/0x34d [<ffffffff8833ca89>] :xfs:xfs_vm_writepage+0x0/0xdd [<ffffffff80256d07>] do_writepages+0x20/0x2f [<ffffffff8022dbd7>] __writeback_single_inode+0x1b4/0x38b [<ffffffff881a8a46>] :dm_mod:dm_any_congested+0x38/0x3f [<ffffffff881aa58a>] :dm_mod:dm_table_any_congested+0x46/0x63 [<ffffffff8021edb1>] sync_sb_inodes+0x1d1/0x2b5 [<ffffffff802901be>] keventd_create_kthread+0x0/0x61 [<ffffffff8024c991>] writeback_inodes+0x7d/0xd3 [<ffffffff802a894a>] background_writeout+0x82/0xb5 [<ffffffff8025242d>] pdflush+0x0/0x1ed [<ffffffff80252570>] pdflush+0x143/0x1ed [<ffffffff802a88c8>] background_writeout+0x0/0xb5 [<ffffffff8023055a>] kthread+0xd4/0x107 [<ffffffff80259360>] child_rip+0xa/0x12 [<ffffffff802901be>] keventd_create_kthread+0x0/0x61 [<ffffffff80230486>] kthread+0x0/0x107 [<ffffffff80259356>] child_rip+0x0/0x12 Code: 48 8b 07 48 c1 e8 3a 48 8b 14 c5 20 d0 52 80 48 b8 b7 6d db RIP [<ffffffff802a749a>] page_to_pfn+0x0/0x33 RSP <ffff81001fd317d8> CR2: 0000000000000000 ksymoops output: Unable to handle kernel NULL pointer dereference at 0000000000000000 RIP: [<ffffffff802a749a>] page_to_pfn+0x0/0x33 Oops: 0000 [1] SMP CPU 0 ac97_codec pcspkr i2c_nforce2 soundcore i2c_core evdev eth1394 ext3 jbd mbcache Pid: 203, comm: pdflush Not tainted 2.6.18-4-amd64 #1 RIP: 0010:[<ffffffff802a749a>] [<ffffffff802a749a>] page_to_pfn+0x0/0x33 Using defaults from ksymoops -t elf64-x86-64 -a i386:x86-64 RSP: 0018:ffff81001fd317d8 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff810017de2140 RCX: 0000000000000000 RDX: 0000000000000014 RSI: ffff810017de2140 RDI: 0000000000000000 RBP: ffff810017e44000 R08: 0000000000000000 R09: ffff81001fc027f0 R10: 0000000000000246 R11: ffff810017d3edc0 R12: ffff810017de2140 R13: 0000000000000000 R14: 0000000000000000 R15: ffff81001f30cc98 FS: 00002b536bdd56d0(0000) GS:ffffffff80521000(0000) knlGS:0000000000000000 CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b CR2: 0000000000000000 CR3: 000000001f6aa000 CR4: 00000000000006e0 Stack: ffffffff8022bf96 ffff81001fc027f0 000000000000d400 0000000000000000 ffff810000000001 0000000000000001 ffff810017de2140 ffff81001f30cc98 ffff810017de2240 ffff810017c7aca8 0000000000000014 000000000000b000 Call Trace: [<ffffffff8022bf96>] blk_recount_segments+0x7e/0x21b [<ffffffff802bb9ae>] __bio_clone+0x71/0x8a [<ffffffff802bb9fc>] bio_clone+0x35/0x3d [<ffffffff882e476a>] :dm_crypt:crypt_map+0xcd/0x304 [<ffffffff881a82bf>] :dm_mod:__map_bio+0x47/0x9b [<ffffffff881a8c1f>] :dm_mod:__split_bio+0x172/0x37d [<ffffffff802200e5>] __up_read+0x13/0x8a [<ffffffff881a9432>] :dm_mod:dm_request+0x101/0x110 [<ffffffff80219f55>] generic_make_request+0x13a/0x14d [<ffffffff80231028>] submit_bio+0xcb/0xd2 [<ffffffff8022aa71>] __bio_add_page+0x154/0x1ce [<ffffffff8833bd8b>] :xfs:xfs_submit_ioend_bio+0x1e/0x27 [<ffffffff8833c7c3>] :xfs:xfs_page_state_convert+0xa2f/0xb6e [<ffffffff8833cb30>] :xfs:xfs_vm_writepage+0xa7/0xdd [<ffffffff8021ac61>] mpage_writepages+0x1a6/0x34d [<ffffffff8833ca89>] :xfs:xfs_vm_writepage+0x0/0xdd [<ffffffff80256d07>] do_writepages+0x20/0x2f [<ffffffff8022dbd7>] __writeback_single_inode+0x1b4/0x38b [<ffffffff881a8a46>] :dm_mod:dm_any_congested+0x38/0x3f [<ffffffff881aa58a>] :dm_mod:dm_table_any_congested+0x46/0x63 [<ffffffff8021edb1>] sync_sb_inodes+0x1d1/0x2b5 [<ffffffff802901be>] keventd_create_kthread+0x0/0x61 [<ffffffff8024c991>] writeback_inodes+0x7d/0xd3 [<ffffffff802a894a>] background_writeout+0x82/0xb5 [<ffffffff8025242d>] pdflush+0x0/0x1ed [<ffffffff80252570>] pdflush+0x143/0x1ed [<ffffffff802a88c8>] background_writeout+0x0/0xb5 [<ffffffff8023055a>] kthread+0xd4/0x107 [<ffffffff80259360>] child_rip+0xa/0x12 [<ffffffff802901be>] keventd_create_kthread+0x0/0x61 [<ffffffff80230486>] kthread+0x0/0x107 [<ffffffff80259356>] child_rip+0x0/0x12 Code: 48 8b 07 48 c1 e8 3a 48 8b 14 c5 20 d0 52 80 48 b8 b7 6d db >>RIP; ffffffff802a749a <page_to_pfn+0/33> <===== >>RBX; ffff810017de2140 <phys_startup_64+ffff810017be2040/ffffffff7fffff00> >>RSI; ffff810017de2140 <phys_startup_64+ffff810017be2040/ffffffff7fffff00> >>RBP; ffff810017e44000 <phys_startup_64+ffff810017c43f00/ffffffff7fffff00> >>R09; ffff81001fc027f0 <phys_startup_64+ffff81001fa026f0/ffffffff7fffff00> >>R11; ffff810017d3edc0 <phys_startup_64+ffff810017b3ecc0/ffffffff7fffff00> >>R12; ffff810017de2140 <phys_startup_64+ffff810017be2040/ffffffff7fffff00> >>R15; ffff81001f30cc98 <phys_startup_64+ffff81001f10cb98/ffffffff7fffff00> Trace; ffffffff8022bf96 <blk_recount_segments+7e/21b> Trace; ffffffff802bb9ae <__bio_clone+71/8a> Trace; ffffffff802bb9fc <bio_clone+35/3d> Trace; ffffffff882e476a <_end+7d7776a/7f093000> Trace; ffffffff881a82bf <_end+7c3b2bf/7f093000> Trace; ffffffff881a8c1f <_end+7c3bc1f/7f093000> Trace; ffffffff802200e5 <__up_read+13/8a> Trace; ffffffff881a9432 <_end+7c3c432/7f093000> Trace; ffffffff80219f55 <generic_make_request+13a/14d> Trace; ffffffff80231028 <submit_bio+cb/d2> Trace; ffffffff8022aa71 <__bio_add_page+154/1ce> Trace; ffffffff8833bd8b <_end+7dced8b/7f093000> Trace; ffffffff8833c7c3 <_end+7dcf7c3/7f093000> Trace; ffffffff8833cb30 <_end+7dcfb30/7f093000> Trace; ffffffff8021ac61 <mpage_writepages+1a6/34d> Trace; ffffffff8833ca89 <_end+7dcfa89/7f093000> Trace; ffffffff80256d07 <do_writepages+20/2f> Trace; ffffffff8022dbd7 <__writeback_single_inode+1b4/38b> Trace; ffffffff881a8a46 <_end+7c3ba46/7f093000> Trace; ffffffff881aa58a <_end+7c3d58a/7f093000> Trace; ffffffff8021edb1 <sync_sb_inodes+1d1/2b5> Trace; ffffffff802901be <keventd_create_kthread+0/61> Trace; ffffffff8024c991 <writeback_inodes+7d/d3> Trace; ffffffff802a894a <background_writeout+82/b5> Trace; ffffffff8025242d <pdflush+0/1ed> Trace; ffffffff80252570 <pdflush+143/1ed> Trace; ffffffff802a88c8 <background_writeout+0/b5> Trace; ffffffff8023055a <kthread+d4/107> Trace; ffffffff80259360 <child_rip+a/12> Trace; ffffffff802901be <keventd_create_kthread+0/61> Trace; ffffffff80230486 <kthread+0/107> Trace; ffffffff80259356 <child_rip+0/12> Code; ffffffff802a749a <page_to_pfn+0/33> 0000000000000000 <_RIP>: Code; ffffffff802a749a <page_to_pfn+0/33> <===== 0: 48 8b 07 mov (%rdi),%rax <===== Code; ffffffff802a749d <page_to_pfn+3/33> 3: 48 c1 e8 3a shr $0x3a,%rax Code; ffffffff802a74a1 <page_to_pfn+7/33> 7: 48 8b 14 c5 20 d0 52 mov 0xffffffff8052d020(,%rax,8),%rdx Code; ffffffff802a74a8 <page_to_pfn+e/33> e: 80 Code; ffffffff802a74a9 <page_to_pfn+f/33> f: 48 b8 b7 6d db 00 00 mov $0xdb6db7,%rax Code; ffffffff802a74b0 <page_to_pfn+16/33> 16: 00 00 00 CR2: 0000000000000000
