Problem Description ========================== On talclp1, I enabled kdump. But kdump failed and it drop to BusyBox. root@talclp1:~# echo c> /proc/sysrq-trigger [ 132.643690] sysrq: SysRq : Trigger a crash [ 132.643739] Unable to handle kernel paging request for data at address 0x00000000 [ 132.643745] Faulting instruction address: 0xc0000000005c28f4 [ 132.643749] Oops: Kernel access of bad area, sig: 11 [#1] [ 132.643753] SMP NR_CPUS=2048 NUMA pSeries [ 132.643758] Modules linked in: fuse ufs qnx4 hfsplus hfs minix ntfs msdos jfs rpadlpar_io rpaphp rpcsec_gss_krb5 nfsv4 dccp_diag cifs nfs dns_resolver dccp tcp_diag fscache udp_diag inet_diag unix_diag af_packet_diag netlink_diag binfmt_misc xfs libcrc32c pseries_rng rng_core ghash_generic gf128mul vmx_crypto sg nfsd auth_rpcgss nfs_acl lockd grace sunrpc ip_tables x_tables autofs4 ext4 crc16 jbd2 fscrypto mbcache crc32c_generic btrfs xor raid6_pq dm_round_robin sr_mod sd_mod cdrom ses enclosure scsi_transport_sas ibmveth crc32c_vpmsum ipr scsi_dh_emc scsi_dh_rdac scsi_dh_alua dm_multipath dm_mod [ 132.643819] CPU: 49 PID: 10174 Comm: bash Not tainted 4.8.0-15-generic #16-Ubuntu [ 132.643824] task: c000000111767080 task.stack: c0000000d82e0000 [ 132.643828] NIP: c0000000005c28f4 LR: c0000000005c39d8 CTR: c0000000005c28c0 [ 132.643832] REGS: c0000000d82e3990 TRAP: 0300 Not tainted (4.8.0-15-generic) [ 132.643836] MSR: 8000000000009033 CR: 28242422 XER: 00000001 [ 132.643848] CFAR: c0000000000087d0 DAR: 0000000000000000 DSISR: 42000000 SOFTE: 1 GPR00: c0000000005c39d8 c0000000d82e3c10 c000000000f67b00 0000000000000063 GPR04: c00000011d04a9b8 c00000011d05f7e0 c00000047fb00000 0000000000015998 GPR08: 0000000000000007 0000000000000001 0000000000000000 0000000000000001 GPR12: c0000000005c28c0 c000000007b4b900 ffffffffffffffff 0000000022000000 GPR16: 0000000010170dc8 000001002b566368 0000000010140f58 00000000100c7570 GPR20: 0000000000000000 000000001017dd58 0000000010153618 000000001017b608 GPR24: 00003ffffe87a294 0000000000000001 c000000000ebff60 0000000000000004 GPR28: c000000000ec0320 0000000000000063 c000000000e72a90 0000000000000000 [ 132.643906] NIP [c0000000005c28f4] sysrq_handle_crash+0x34/0x50 [ 132.643911] LR [c0000000005c39d8] __handle_sysrq+0xe8/0x280 [ 132.643914] Call Trace: [ 132.643917] [c0000000d82e3c10] [c000000000a245e8] 0xc000000000a245e8 (unreliable) [ 132.643923] [c0000000d82e3c30] [c0000000005c39d8] __handle_sysrq+0xe8/0x280 [ 132.643928] [c0000000d82e3cd0] [c0000000005c4188] write_sysrq_trigger+0x78/0xa0 [ 132.643935] [c0000000d82e3d00] [c0000000003ad770] proc_reg_write+0xb0/0x110 [ 132.643941] [c0000000d82e3d50] [c00000000030fc3c] __vfs_write+0x6c/0xe0 [ 132.643946] [c0000000d82e3d90] [c000000000311144] vfs_write+0xd4/0x240 [ 132.643950] [c0000000d82e3de0] [c000000000312e5c] SyS_write+0x6c/0x110 [ 132.643957] [c0000000d82e3e30] [c0000000000095e0] system_call+0x38/0x108 [ 132.643961] Instruction dump: [ 132.643963] 38425240 7c0802a6 f8010010 f821ffe1 60000000 60000000 3d220019 3949ba60 [ 132.643972] 39200001 912a0000 7c0004ac 39400000 <992a0000> 38210020 e8010010 7c0803a6 [ 132.643981] ---[ end trace eed6bbcd2c3bdfdf ]--- [ 132.646105] [ 132.646176] Sending IPI to other CPUs [ 132.647490] IPI complete I'm in purgatory -> smp_release_cpus() spinning_secondaries = 104 <- smp_release_cpus() [ 2.011346] alg: hash: Test 1 failed for crc32c-vpmsum [ 2.729254] sd 0:2:0:0: [sda] Assuming drive cache: write through [ 2.731554] sd 1:2:5:0: [sdn] Assuming drive cache: write through [ 2.739087] sd 1:2:4:0: [sdm] Assuming drive cache: write through [ 2.739089] sd 1:2:6:0: [sdo] Assuming drive cache: write through [ 2.739110] sd 1:2:7:0: [sdp] Assuming drive cache: write through [ 2.739115] sd 1:2:0:0: [sdi] Assuming drive cache: write through [ 2.739122] sd 1:2:3:0: [sdl] Assuming drive cache: write through [ 2.739123] sd 1:2:2:0: [sdk] Assuming drive cache: write through [ 2.739148] sd 1:2:1:0: [sdj] Assuming drive cache: write through [ 2.748938] sd 0:2:1:0: [sdb] Assuming drive cache: write through [ 2.748939] sd 0:2:7:0: [sdh] Assuming drive cache: write through [ 2.748940] sd 0:2:6:0: [sdg] Assuming drive cache: write through [ 2.748942] sd 0:2:2:0: [sdc] Assuming drive cache: write through [ 2.748958] sd 0:2:5:0: [sdf] Assuming drive cache: write through [ 2.748963] sd 0:2:4:0: [sde] Assuming drive cache: write through [ 2.748978] sd 0:2:3:0: [sdd] Assuming drive cache: write through [ 2.999087] device-mapper: table: 254:0: multipath: error attaching hardware handler [ 3.119912] device-mapper: table: 254:0: multipath: error attaching hardware handler [ 3.252513] device-mapper: table: 254:0: multipath: error attaching hardware handler [ 3.343680] device-mapper: table: 254:0: multipath: error attaching hardware handler [ 3.381234] device-mapper: table: 254:1: multipath: error attaching hardware handler [ 3.419515] device-mapper: table: 254:0: multipath: error attaching hardware handler [ 3.474587] device-mapper: table: 254:1: multipath: error attaching hardware handler [ 3.482188] device-mapper: table: 254:0: multipath: error attaching hardware handler [ 3.531439] device-mapper: table: 254:1: multipath: error attaching hardware handler [ 3.552824] device-mapper: table: 254:0: multipath: error attaching hardware handler [ 3.594489] device-mapper: table: 254:1: multipath: error attaching hardware handler [ 3.619222] device-mapper: table: 254:0: multipath: error attaching hardware handler [ 3.672208] device-mapper: table: 254:0: multipath: error attaching hardware handler [ 3.680298] device-mapper: table: 254:1: multipath: error attaching hardware handler [ 3.731718] device-mapper: table: 254:0: multipath: error attaching hardware handler [ 3.761333] device-mapper: table: 254:1: multipath: error attaching hardware handler [ 3.794955] device-mapper: table: 254:0: multipath: error attaching hardware handler [ 3.819212] device-mapper: table: 254:1: multipath: error attaching hardware handler [ 3.871913] device-mapper: table: 254:0: multipath: error attaching hardware handler [ 3.889439] device-mapper: table: 254:1: multipath: error attaching hardware handler [ 3.922620] device-mapper: table: 254:0: multipath: error attaching hardware handler [ 3.960707] device-mapper: table: 254:1: multipath: error attaching hardware handler [ 4.002959] device-mapper: table: 254:0: multipath: error attaching hardware handler [ 4.035611] device-mapper: table: 254:1: multipath: error attaching hardware handler [ 4.054476] device-mapper: table: 254:0: multipath: error attaching hardware handler [ 4.092241] device-mapper: table: 254:1: multipath: error attaching hardware handler [ 4.099432] device-mapper: table: 254:0: multipath: error attaching hardware handler [ 4.182358] device-mapper: table: 254:0: multipath: error attaching hardware handler [ 4.182823] device-mapper: table: 254:1: multipath: error attaching hardware handler [ 4.234767] device-mapper: table: 254:1: multipath: error attaching hardware handler [ 4.333309] device-mapper: table: 254:0: multipath: error attaching hardware handler [ 4.402827] device-mapper: table: 254:0: multipath: error attaching hardware handler Gave up waiting for root device. Common problems: - Boot args (cat /proc/cmdline) - Check rootdelay= (did the system wait long enough?) - Check root= (did the system wait for the right device?) - Missing modules (cat /proc/modules; ls /dev) ALERT! UUID=853769e5-1dc5-41be-a689-b430320d207f does not exist. Dropping to a shell! BusyBox v1.22.1 (Ubuntu 1:1.22.0-19ubuntu2) built-in shell (ash) Enter 'help' for a list of built-in commands. (initramfs) == Comment: #7 - Vaishnavi Bhat