This bug happened on the client running Lustre-2.1.2, has anybody seen that before? BUG: unable to handle kernel paging request at 00000000ffffffff IP: [<ffffffffa0895d05>] ll_intent_drop_lock+0x15/0xb0 [lustre] PGD 488b52067 PUD 0 Oops: 0000 [#1] SMP last sysfs file: /sys/module/ipmi_si/initstate CPU 0 Modules linked in: lmv(U) ipmi_si ipmi_devintf ipmi_msghandler mgc(U) lustre(U) lov(U) osc(U) lquota(U) mdc(U) fid(U) fld(U) ko2iblnd(U) ptlrpc(U) obdclass(U) lnet(U) lvfs(U) libcfs(U) nfsd exportfs acpi_cpufreq freq_table mperf rdma_ucm(U) rdma_cm(U) iw_cm(U) ib_addr(U) ib_ipoib(U) ib_cm(U) ib_sa(U) ib_uverbs(U) ib_umad(U) mlx4_ib(U) ib_mad(U) ib_core(U) mlx4_core(U) ext4 mbcache jbd2 dm_mirror dm_region_hash dm_log dm_mod vhost_net macvtap macvlan tun kvm wmi microcode dcdbas sg sb_edac edac_core i2c_i801 i2c_core iTCO_wdt iTCO_vendor_support shpchp ioatdma ipv6 sd_mod crc_t10dif ahci igb dca nfs lockd fscache nfs_acl auth_rpcgss sunrpc [last unloaded: scsi_wait_scan] Pid: 89623, comm: ks_spectrum_his Tainted: G W ---------------- 2.6.32-220.23.1.el6.x86_64 #1 Dell Inc. PowerEdge C6220/0W6W6G RIP: 0010:[<ffffffffa0895d05>] [<ffffffffa0895d05>] ll_intent_drop_lock+0x15/0xb0 [lustre] RSP: 0018:ffff880c6eb21c78 EFLAGS: 00010286 RAX: 00000000030e0580 RBX: 00000000ffffffff RCX: 0000000000000002 RDX: ffff88069193b348 RSI: ffffffff81ace670 RDI: 00000000ffffffff RBP: ffff880c6eb21cb8 R08: ffff88069193b348 R09: 000000000000000b R10: 0000000000000003 R11: 0000000000000086 R12: ffff88071f2eb840 R13: ffff88062e3daeb8 R14: ffff88071f2eb840 R15: ffff8807078b81c0 FS: 00007fb5ffdd9700(0000) GS:ffff880044600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000ffffffff CR3: 0000000c6ea7a000 CR4: 00000000000406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process ks_spectrum_his (pid: 89623, threadinfo ffff880c6eb20000, task ffff880ec182b580) Stack: ffff880c6eb21ce8 ffff8808690cd000 ffff88062e3dad80 ffffffffa0895000 <0> ffff88071f2eb840 ffff88062e3daeb8 00000000ffffffff ffff88071f2eb840 <0> ffff880c6eb21cf8 ffffffffa08962a1 ffff880c6eb21d28 ffff88062e3daeb8 Call Trace: [<ffffffffa0895000>] ? return_if_equal+0x0/0x30 [lustre] [<ffffffffa08962a1>] ll_intent_release+0x41/0x1c0 [lustre] [<ffffffffa0896475>] ll_release+0x55/0x470 [lustre] [<ffffffff81190a72>] ? iput+0x62/0x70 [<ffffffffa0897a01>] ? ll_d_iput+0x31/0x60 [lustre] [<ffffffff8118d6c8>] d_free+0x28/0x60 [<ffffffff8118d749>] d_kill+0x49/0x60 [<ffffffff8118f15c>] dput+0x7c/0x150 [<ffffffff81178379>] __fput+0x189/0x210 [<ffffffff81178425>] fput+0x25/0x30 [<ffffffff81173e6d>] filp_close+0x5d/0x90 [<ffffffff8106c7bf>] put_files_struct+0x7f/0xf0 [<ffffffff8106c883>] exit_files+0x53/0x70 [<ffffffff8106e8f5>] do_exit+0x185/0x870 [<ffffffff8106f038>] do_group_exit+0x58/0xd0 [<ffffffff8106f0c7>] sys_exit_group+0x17/0x20 [<ffffffff8100b0f2>] system_call_fastpath+0x16/0x1b Code: 24 00 00 00 00 e8 ec 14 bc ff e9 ec fe ff ff 0f 1f 80 00 00 00 00 55 48 89 e5 48 83 ec 40 48 89 5d f0 4c 89 65 f8 0f 1f 44 00 00 <8b> 0f 48 89 fb 85 c9 74 7e 8b 77 28 85 f6 74 77 f6 05 ca 69 bd RIP [<ffffffffa0895d05>] ll_intent_drop_lock+0x15/0xb0 [lustre] RSP <ffff880c6eb21c78> CR2: 00000000ffffffff ---[ end trace 7e2bd11f85dd477d ]--- Kernel panic - not syncing: Fatal exception Pid: 89623, comm: ks_spectrum_his Tainted: G D W ---------------- 2.6.32-220.23.1.el6.x86_64 #1 Call Trace: [<ffffffff814ecb34>] ? panic+0x78/0x143 [<ffffffff814f0cd4>] ? oops_end+0xe4/0x100 [<ffffffff810423fb>] ? no_context+0xfb/0x260 [<ffffffff81042685>] ? __bad_area_nosemaphore+0x125/0x1e0 [<ffffffff81042753>] ? bad_area_nosemaphore+0x13/0x20 [<ffffffff81042e0d>] ? __do_page_fault+0x31d/0x480 [<ffffffffa045bc8f>] ? cfs_hash_bd_from_key+0x3f/0xc0 [libcfs] [<ffffffffa0895000>] ? return_if_equal+0x0/0x30 [lustre] [<ffffffffa045c317>] ? cfs_hash_bd_get+0x37/0x90 [libcfs] [<ffffffffa0614735>] ? ldlm_resource_foreach+0x85/0x3e0 [ptlrpc] [<ffffffffa06004e7>] ? ldlm_resource_putref+0x67/0x270 [ptlrpc] [<ffffffff814f2c8e>] ? do_page_fault+0x3e/0xa0 [<ffffffff814f0045>] ? page_fault+0x25/0x30 [<ffffffffa0895d05>] ? ll_intent_drop_lock+0x15/0xb0 [lustre] [<ffffffffa0895000>] ? return_if_equal+0x0/0x30 [lustre] [<ffffffffa0895000>] ? return_if_equal+0x0/0x30 [lustre] [<ffffffffa08962a1>] ? ll_intent_release+0x41/0x1c0 [lustre] [<ffffffffa0896475>] ? ll_release+0x55/0x470 [lustre] [<ffffffff81190a72>] ? iput+0x62/0x70 [<ffffffffa0897a01>] ? ll_d_iput+0x31/0x60 [lustre] [<ffffffff8118d6c8>] ? d_free+0x28/0x60 [<ffffffff8118d749>] ? d_kill+0x49/0x60 [<ffffffff8118f15c>] ? dput+0x7c/0x150 [<ffffffff81178379>] ? __fput+0x189/0x210 [<ffffffff81178425>] ? fput+0x25/0x30 [<ffffffff81173e6d>] ? filp_close+0x5d/0x90 [<ffffffff8106c7bf>] ? put_files_struct+0x7f/0xf0 [<ffffffff8106c883>] ? exit_files+0x53/0x70 [<ffffffff8106e8f5>] ? do_exit+0x185/0x870 [<ffffffff8106f038>] ? do_group_exit+0x58/0xd0 [<ffffffff8106f0c7>] ? sys_exit_group+0x17/0x20 [<ffffffff8100b0f2>] ? system_call_fastpath+0x16/0x1b -- Wojciech Turek Senior System Architect High Performance Computing Service University of Cambridge Email: wjt27 at cam.ac.uk Tel: (+)44 1223 763517