Same bug here, system was dist-upgraded from intrepid:
[825695.371723] ------------[ cut here ]------------ [825695.371766] kernel BUG at /build/buildd/linux-2.6.28/fs/nfs/write.c:252! [825695.371795] invalid opcode: 0000 [#1] SMP [825695.371823] last sysfs file: /sys/module/ppdev/initstate [825695.371850] Dumping ftrace buffer: [825695.371875] (ftrace buffer empty) [825695.371898] CPU 4 [825695.371919] Modules linked in: iptable_filter ip_tables x_tables nfs lockd nfs_acl sunrpc ppdev video output input_polldev aoe 8021q garp stp bonding lp parport psmouse pcspkr iTCO_wdt serio_raw i5100_edac iTCO_vendor_support edac_core joydev xfs usbhid usb_storage e1000e raid10 raid456 async_xor async_memcpy async_tx xor raid1 raid0 multipath linear fbcon tileblit font bitblit softcursor [825695.372133] Pid: 30470, comm: smbd Not tainted 2.6.28-13-server #45-Ubuntu [825695.372161] RIP: 0010:[<ffffffffa02b1771>] [<ffffffffa02b1771>] nfs_page_async_flush+0xa1/0x140 [nfs] [825695.372225] RSP: 0018:ffff880484e29aa8 EFLAGS: 00010206 [825695.372251] RAX: 0000000000000001 RBX: ffffe200064cdd40 RCX: 0000000000000015 [825695.372294] RDX: 0000000000000000 RSI: 0000000000600020 RDI: ffff8802327a7e5c [825695.372337] RBP: ffff880484e29ad8 R08: ffff8803e15c1c58 R09: ffff880498c87b80 [825695.372380] R10: 0000000000000000 R11: 0000000000000000 R12: ffff880498c87b80 [825695.372423] R13: ffff8802327a7e5c R14: ffffe200064cdd40 R15: ffff880484e29c48 [825695.372466] FS: 00007f9ac4826710(0000) GS:ffff88061efa2700(0000) knlGS:0000000000000000 [825695.372511] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [825695.372538] CR2: 00007f9abfe481e4 CR3: 000000028c4c1000 CR4: 00000000000006a0 [825695.372581] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [825695.372624] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [825695.372667] Process smbd (pid: 30470, threadinfo ffff880484e28000, task ffff88061cd15980) [825695.372711] Stack: [825695.372731] 0007ffffffffffff ffffe200064cdd40 ffff880484e29c48 ffff880484e29b90 [825695.372766] 0007ffffffffffff 0000000000000001 ffff880484e29af8 ffffffffa02b1897 [825695.372816] ffffe200064cdd40 ffffe200064cdd40 ffff880484e29b18 ffffffffa02b19c9 [825695.372883] Call Trace: [825695.372905] [<ffffffffa02b1897>] nfs_do_writepage+0x87/0x90 [nfs] [825695.372942] [<ffffffffa02b19c9>] nfs_writepages_callback+0x19/0x30 [nfs] [825695.372981] [<ffffffff802b8a28>] write_cache_pages+0x228/0x480 [825695.373013] [<ffffffffa02b19b0>] ? nfs_writepages_callback+0x0/0x30 [nfs] [825695.373053] [<ffffffff80226910>] ? native_flush_tlb_others+0xd0/0xf0 [825695.373085] [<ffffffff802d26be>] ? free_pages_and_swap_cache+0x7e/0xa0 [825695.373116] [<ffffffffa02b1053>] nfs_writepages+0xa3/0xf0 [nfs] [825695.373154] [<ffffffffa02b1260>] ? nfs_flush_one+0x0/0xf0 [nfs] [825695.373191] [<ffffffff802bf31f>] ? vma_prio_tree_next+0x3f/0x60 [825695.373220] [<ffffffff802b8cd8>] do_writepages+0x28/0x50 [825695.373248] [<ffffffff802b0c61>] __filemap_fdatawrite_range+0x51/0x60 [825695.373279] [<ffffffff802b0caa>] filemap_fdatawrite+0x1a/0x20 [825695.373307] [<ffffffff802b11b5>] filemap_write_and_wait+0x35/0x50 [825695.373336] [<ffffffffa02a5e23>] nfs_sync_mapping+0x33/0x50 [nfs] [825695.373373] [<ffffffffa02a2b57>] do_setlk+0x97/0xe0 [nfs] [825695.373408] [<ffffffffa02a2d20>] nfs_lock+0xd0/0x1e0 [nfs] [825695.373444] [<ffffffff8031f82e>] vfs_lock_file+0x1e/0x40 [825695.373473] [<ffffffff8031f958>] do_lock_file_wait+0x48/0xf0 [825695.373501] [<ffffffff8031fb1c>] fcntl_setlk+0x11c/0x220 [825695.373529] [<ffffffff802f5b51>] do_fcntl+0x31/0x290 [825695.373557] [<ffffffff802f5e10>] sys_fcntl+0x60/0x90 [825695.373584] [<ffffffff8021253a>] system_call_fastpath+0x16/0x1b [825695.373614] Code: e8 45 de f7 df 90 31 db 48 83 c4 08 89 d8 5b 41 5c 41 5d 41 5e 41 5f c9 c3 90 41 f6 44 24 40 02 74 0d 4c 89 ef e8 20 de f7 df 90 <0f> 0b eb fe 4c 89 f7 e8 43 76 00 e0 85 c0 75 74 49 8b 46 18 ba [825695.373806] RIP [<ffffffffa02b1771>] nfs_page_async_flush+0xa1/0x140 [nfs] [825695.373845] RSP <ffff880484e29aa8> [825695.374178] ---[ end trace 0c6dcbbe446cd8b2 ]---
Same bug here, system was dist-upgraded from intrepid:
[825695.371723] ------------[ cut here ]------------ buildd/ linux-2. 6.28/fs/ nfs/write. c:252! ppdev/initstate ffffffffa02b177 1>] [<ffffffffa02b1 771>] nfs_page_ async_flush+ 0xa1/0x140 [nfs] e29aa8 EFLAGS: 00010206 0(0000) GS:ffff88061efa 2700(0000) knlGS:000000000 0000000 897>] nfs_do_ writepage+ 0x87/0x90 [nfs] 9c9>] nfs_writepages_ callback+ 0x19/0x30 [nfs] a28>] write_cache_ pages+0x228/ 0x480 9b0>] ? nfs_writepages_ callback+ 0x0/0x30 [nfs] 910>] ? native_ flush_tlb_ others+ 0xd0/0xf0 6be>] ? free_pages_ and_swap_ cache+0x7e/ 0xa0 053>] nfs_writepages+ 0xa3/0xf0 [nfs] 260>] ? nfs_flush_ one+0x0/ 0xf0 [nfs] 31f>] ? vma_prio_ tree_next+ 0x3f/0x60 cd8>] do_writepages+ 0x28/0x50 c61>] __filemap_ fdatawrite_ range+0x51/ 0x60 caa>] filemap_ fdatawrite+ 0x1a/0x20 1b5>] filemap_ write_and_ wait+0x35/ 0x50 e23>] nfs_sync_ mapping+ 0x33/0x50 [nfs] b57>] do_setlk+0x97/0xe0 [nfs] d20>] nfs_lock+0xd0/0x1e0 [nfs] 82e>] vfs_lock_ file+0x1e/ 0x40 958>] do_lock_ file_wait+ 0x48/0xf0 b1c>] fcntl_setlk+ 0x11c/0x220 b51>] do_fcntl+0x31/0x290 e10>] sys_fcntl+0x60/0x90 53a>] system_ call_fastpath+ 0x16/0x1b 771>] nfs_page_ async_flush+ 0xa1/0x140 [nfs]
[825695.371766] kernel BUG at /build/
[825695.371795] invalid opcode: 0000 [#1] SMP
[825695.371823] last sysfs file: /sys/module/
[825695.371850] Dumping ftrace buffer:
[825695.371875] (ftrace buffer empty)
[825695.371898] CPU 4
[825695.371919] Modules linked in: iptable_filter ip_tables x_tables nfs lockd nfs_acl sunrpc ppdev video output input_polldev aoe 8021q garp stp bonding lp parport psmouse pcspkr iTCO_wdt serio_raw i5100_edac iTCO_vendor_support edac_core joydev xfs usbhid usb_storage e1000e raid10 raid456 async_xor async_memcpy async_tx xor raid1 raid0 multipath linear fbcon tileblit font bitblit softcursor
[825695.372133] Pid: 30470, comm: smbd Not tainted 2.6.28-13-server #45-Ubuntu
[825695.372161] RIP: 0010:[<
[825695.372225] RSP: 0018:ffff880484
[825695.372251] RAX: 0000000000000001 RBX: ffffe200064cdd40 RCX: 0000000000000015
[825695.372294] RDX: 0000000000000000 RSI: 0000000000600020 RDI: ffff8802327a7e5c
[825695.372337] RBP: ffff880484e29ad8 R08: ffff8803e15c1c58 R09: ffff880498c87b80
[825695.372380] R10: 0000000000000000 R11: 0000000000000000 R12: ffff880498c87b80
[825695.372423] R13: ffff8802327a7e5c R14: ffffe200064cdd40 R15: ffff880484e29c48
[825695.372466] FS: 00007f9ac482671
[825695.372511] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[825695.372538] CR2: 00007f9abfe481e4 CR3: 000000028c4c1000 CR4: 00000000000006a0
[825695.372581] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[825695.372624] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[825695.372667] Process smbd (pid: 30470, threadinfo ffff880484e28000, task ffff88061cd15980)
[825695.372711] Stack:
[825695.372731] 0007ffffffffffff ffffe200064cdd40 ffff880484e29c48 ffff880484e29b90
[825695.372766] 0007ffffffffffff 0000000000000001 ffff880484e29af8 ffffffffa02b1897
[825695.372816] ffffe200064cdd40 ffffe200064cdd40 ffff880484e29b18 ffffffffa02b19c9
[825695.372883] Call Trace:
[825695.372905] [<ffffffffa02b1
[825695.372942] [<ffffffffa02b1
[825695.372981] [<ffffffff802b8
[825695.373013] [<ffffffffa02b1
[825695.373053] [<ffffffff80226
[825695.373085] [<ffffffff802d2
[825695.373116] [<ffffffffa02b1
[825695.373154] [<ffffffffa02b1
[825695.373191] [<ffffffff802bf
[825695.373220] [<ffffffff802b8
[825695.373248] [<ffffffff802b0
[825695.373279] [<ffffffff802b0
[825695.373307] [<ffffffff802b1
[825695.373336] [<ffffffffa02a5
[825695.373373] [<ffffffffa02a2
[825695.373408] [<ffffffffa02a2
[825695.373444] [<ffffffff8031f
[825695.373473] [<ffffffff8031f
[825695.373501] [<ffffffff8031f
[825695.373529] [<ffffffff802f5
[825695.373557] [<ffffffff802f5
[825695.373584] [<ffffffff80212
[825695.373614] Code: e8 45 de f7 df 90 31 db 48 83 c4 08 89 d8 5b 41 5c 41 5d 41 5e 41 5f c9 c3 90 41 f6 44 24 40 02 74 0d 4c 89 ef e8 20 de f7 df 90 <0f> 0b eb fe 4c 89 f7 e8 43 76 00 e0 85 c0 75 74 49 8b 46 18 ba
[825695.373806] RIP [<ffffffffa02b1
[825695.373845] RSP <ffff880484e29aa8>
[825695.374178] ---[ end trace 0c6dcbbe446cd8b2 ]---