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Message #22108
[Bug 1635597] Re: Ubuntu:talclp1: Kdump failed with multipath disk
** Changed in: makedumpfile (Ubuntu Zesty)
Status: Confirmed => Won't Fix
** Changed in: linux (Ubuntu Zesty)
Status: New => Won't Fix
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https://bugs.launchpad.net/bugs/1635597
Title:
Ubuntu:talclp1: Kdump failed with multipath disk
Status in The Ubuntu-power-systems project:
Incomplete
Status in linux package in Ubuntu:
New
Status in makedumpfile package in Ubuntu:
Fix Released
Status in linux source package in Trusty:
New
Status in makedumpfile source package in Trusty:
Confirmed
Status in linux source package in Xenial:
New
Status in makedumpfile source package in Xenial:
Fix Committed
Status in linux source package in Zesty:
Won't Fix
Status in makedumpfile source package in Zesty:
Won't Fix
Bug description:
[Impact]
When the target device where to dump the kernel is under a multipath configuration, dumping will fail, possibly leaving the system stuck in the kdump kernel.
The fix is to include some scsi device handlers needed for the multipath setup inside the initramfs image that is used by kdump.
All modules currently loaded in the system are included.
[Test Case]
Setting up kdump to target a multipath device using an appropriate storage that requires such scsi_dh modules and triggering a crash will demonstrate that kdump fails.
After the fix, it works fine.
[Regression Potential]
If a bug is introduced, loading kdump might fail, and a crash will not be generated. A worse regression that might be considered is the system is stuck in such a kdump kernel and needs to be rebooted locally (and the crash file is not generated either). But since this is what we are trying to fix, we don't expect other systems to break. This didn't happen on a small (less than 1GiB of RAM) x86 VM, though.
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 <SF,EE,ME,IR,DR,RI,LE> 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 <vaish123@xxxxxxxxxx> - 2016-10-07 05:37:53 ==
The blkid output does not show any device with UUID=853769e5-1dc5-41be-a689-b430320d207f
which is the root device used in the kexec command line (from kdump-config show)
kexec command:
/sbin/kexec -p --command-line="BOOT_IMAGE=/boot/vmlinux-4.8.0-15-generic root=UUID=853769e5-1dc5-41be-a689-b430320d207f ro xmon=on splash quiet irqpoll nr_cpus=1 nousb systemd.unit=kdump-tools.service" --initrd=/var/lib/kdump/initrd.img /var/lib/kdump/vmlinuz
Hence the kdump kernel is failing to boot here.
== Comment: #11 - Xue Sheng Li <lixuesh@xxxxxxxxxx> - 2016-10-17 01:54:56 ==
recreated with -24 kernel.
root@talclp1:~# echo c > /proc/sysrq-trigger
[ 72.655416] sysrq: SysRq : Trigger a crash
[ 72.655458] Unable to handle kernel paging request for data at address 0x00000000
[ 72.655463] Faulting instruction address: 0xc00000000069d148
[ 72.655469] Oops: Kernel access of bad area, sig: 11 [#1]
[ 72.655472] SMP NR_CPUS=2048 NUMA pSeries
[ 72.655477] Modules linked in: rpadlpar_io rpaphp dccp_diag dccp tcp_diag udp_diag inet_diag unix_diag af_packet_diag netlink_diag rpcsec_gss_krb5 nfsv4 nfs cifs fscache binfmt_misc xfs pseries_rng vmx_crypto nfsd auth_rpcgss nfs_acl lockd grace sunrpc ip_tables x_tables autofs4 btrfs xor raid6_pq dm_round_robin ses enclosure scsi_transport_sas bnx2x ipr mdio libcrc32c crc32c_vpmsum scsi_dh_emc scsi_dh_rdac scsi_dh_alua dm_multipath
[ 72.655521] CPU: 25 PID: 9730 Comm: bash Not tainted 4.8.0-24-generic #26-Ubuntu
[ 72.655525] task: c0000001d8451e00 task.stack: c0000001d8494000
[ 72.655529] NIP: c00000000069d148 LR: c00000000069e198 CTR: c00000000069d120
[ 72.655534] REGS: c0000001d84979f0 TRAP: 0300 Not tainted (4.8.0-24-generic)
[ 72.655537] MSR: 8000000000009033 <SF,EE,ME,IR,DR,RI,LE> CR: 28242222 XER: 00000001
[ 72.655549] CFAR: c000000000008750 DAR: 0000000000000000 DSISR: 42000000 SOFTE: 1
GPR00: c00000000069e198 c0000001d8497c70 c000000001476700 0000000000000063
GPR04: c00000047e64aca0 c00000047e65fb40 c00000047df00000 0000000000015ed8
GPR08: 0000000000000007 0000000000000001 0000000000000000 0000000000000001
GPR12: c00000000069d120 c000000007b3e100 ffffffffffffffff 0000000022000000
GPR16: 0000000010170dc8 0000010036d36398 0000000010140f58 00000000100c7570
GPR20: 0000000000000000 000000001017dd58 0000000010153618 000000001017b608
GPR24: 00003ffff5582464 0000000000000001 c00000000138e6a0 0000000000000004
GPR28: c00000000138ea60 0000000000000063 c000000001342590 0000000000000000
[ 72.655608] NIP [c00000000069d148] sysrq_handle_crash+0x28/0x30
[ 72.655613] LR [c00000000069e198] __handle_sysrq+0xe8/0x280
[ 72.655616] Call Trace:
[ 72.655619] [c0000001d8497c70] [c00000000069e178] __handle_sysrq+0xc8/0x280 (unreliable)
[ 72.655625] [c0000001d8497d10] [c00000000069e8ec] write_sysrq_trigger+0x6c/0x90
[ 72.655631] [c0000001d8497d40] [c0000000003a9568] proc_reg_write+0x88/0xd0
[ 72.655637] [c0000001d8497d70] [c00000000030c40c] __vfs_write+0x3c/0x70
[ 72.655642] [c0000001d8497d90] [c00000000030d674] vfs_write+0xd4/0x240
[ 72.655647] [c0000001d8497de0] [c00000000030f1c8] SyS_write+0x68/0x110
[ 72.655652] [c0000001d8497e30] [c000000000009584] system_call+0x38/0xec
[ 72.655656] Instruction dump:
[ 72.655658] 60000000 60000000 3c4c00de 384295e0 7c0802a6 60000000 3d22001a 3949c8e0
[ 72.655667] 39200001 912a0000 7c0004ac 39400000 <992a0000> 4e800020 3c4c00de 384295b0
[ 72.655677] ---[ end trace 43b490f085103bf5 ]---
[ 72.659366]
[ 72.659429] Sending IPI to other CPUs
[ 72.660740] IPI complete
I'm in purgatory
-> smp_release_cpus()
spinning_secondaries = 104
<- smp_release_cpus()
[ 1.699068] ibmveth 30000002 (unnamed net_device) (uninitialized): unable to change IPv4 checksum offload settings. 1 rc=4
[ 1.699093] ibmveth 30000002 (unnamed net_device) (uninitialized): unable to change IPv6 checksum offload settings. 1 rc=4
[ 1.699101] ibmveth 30000002 (unnamed net_device) (uninitialized): unable to change tso settings. 1 rc=4
[ 2.657700] sd 0:2:1:0: [sdb] Assuming drive cache: write through
[ 2.657701] sd 0:2:0:0: [sda] Assuming drive cache: write through
[ 2.657781] sd 0:2:2:0: [sdc] Assuming drive cache: write through
[ 2.660641] sd 0:2:7:0: [sdh] Assuming drive cache: write through
[ 2.667731] sd 0:2:4:0: [sde] Assuming drive cache: write through
[ 2.677685] sd 0:2:6:0: [sdg] Assuming drive cache: write through
[ 2.677688] sd 0:2:5:0: [sdf] Assuming drive cache: write through
[ 2.677708] sd 0:2:3:0: [sdd] Assuming drive cache: write through
[ 2.697737] sd 1:2:6:0: [sdo] Assuming drive cache: write through
[ 2.697743] sd 1:2:1:0: [sdj] Assuming drive cache: write through
[ 2.697744] sd 1:2:4:0: [sdm] Assuming drive cache: write through
[ 2.697747] sd 1:2:2:0: [sdk] Assuming drive cache: write through
[ 2.697749] sd 1:2:3:0: [sdl] Assuming drive cache: write through
[ 2.697753] sd 1:2:5:0: [sdn] Assuming drive cache: write through
[ 2.699340] sd 1:2:7:0: [sdp] Assuming drive cache: write through
[ 2.699360] sd 1:2:0:0: [sdi] Assuming drive cache: write through
[ 3.350794] device-mapper: table: 252:0: multipath: error attaching hardware handler
[ 3.471468] device-mapper: table: 252:0: multipath: error attaching hardware handler
[ 3.540387] device-mapper: table: 252:0: multipath: error attaching hardware handler
[ 3.628523] device-mapper: table: 252:0: multipath: error attaching hardware handler
[ 3.657731] device-mapper: table: 252:1: multipath: error attaching hardware handler
[ 3.733416] device-mapper: table: 252:0: multipath: error attaching hardware handler
[ 3.752066] device-mapper: table: 252:1: multipath: error attaching hardware handler
[ 3.808884] device-mapper: table: 252:0: multipath: error attaching hardware handler
[ 3.838148] device-mapper: table: 252:1: multipath: error attaching hardware handler
[ 3.919247] device-mapper: table: 252:0: multipath: error attaching hardware handler
[ 3.950262] device-mapper: table: 252:1: multipath: error attaching hardware handler
[ 3.997839] device-mapper: table: 252:0: multipath: error attaching hardware handler
[ 4.007810] device-mapper: table: 252:1: multipath: error attaching hardware handler
[ 4.082174] device-mapper: table: 252:0: multipath: error attaching hardware handler
[ 4.089411] device-mapper: table: 252:1: multipath: error attaching hardware handler
[ 4.162200] device-mapper: table: 252:0: multipath: error attaching hardware handler
[ 4.202441] device-mapper: table: 252:1: multipath: error attaching hardware handler
[ 4.252289] device-mapper: table: 252:0: multipath: error attaching hardware handler
[ 4.279870] device-mapper: table: 252:1: multipath: error attaching hardware handler
[ 4.311712] device-mapper: table: 252:0: multipath: error attaching hardware handler
[ 4.348150] device-mapper: table: 252:1: multipath: error attaching hardware handler
[ 4.402076] device-mapper: table: 252:0: multipath: error attaching hardware handler
[ 4.432069] device-mapper: table: 252:1: multipath: error attaching hardware handler
[ 4.487871] device-mapper: table: 252:0: multipath: error attaching hardware handler
[ 4.518282] device-mapper: table: 252:1: multipath: error attaching hardware handler
[ 4.573338] device-mapper: table: 252:0: multipath: error attaching hardware handler
[ 4.599280] device-mapper: table: 252:1: multipath: error attaching hardware handler
[ 4.632144] device-mapper: table: 252:0: multipath: error attaching hardware handler
[ 4.671142] device-mapper: table: 252:1: multipath: error attaching hardware handler
[ 4.713352] device-mapper: table: 252:0: multipath: error attaching hardware handler
[ 4.782117] device-mapper: table: 252:0: multipath: error attaching hardware handler
[ 4.890336] device-mapper: table: 252:0: multipath: error attaching hardware handler
== Comment: #13 - Hari Krishna Bathini <hbathini@xxxxxxxxxx> - 2016-10-19 16:26:57 ==
(In reply to comment #12)
> Hi Hari,
>
> Can you please take a look at this issue and suggest what would be the next
> step ?
> We are facing this issue with -24 kernel as well. Can this be a issue with
> kdump kernel that has missing multipath modules or some other issue ?
>
Hi Vaishnavi,
Necessary hardware handler modules are missing in the kdump initrd.
Here is the console log of kdump kernel that says the same:
--
Begin: Loading multipath hardware handlers ... Failure: failed to load module scsi_dh_alua.
Failure: failed to load module scsi_dh_rdac.
Failure: failed to load module scsi_dh_emc.
--
Including this modules explicitly and rebuilding initrd for kdump, able to get to a point
where makedumpfile starts to capture dump but fails with:
"get_mem_map: Can't distinguish the memory type."
which is already tracked with bug 146571
Thanks
Hari
PS1: To explicitly add modules to kdump initrd
1. List the necessary modules in /var/lib/kdump/initramfs-tools/modules file
2. mkinitramfs -d /var/lib/kdump/initramfs-tools -o /var/lib/kdump/initrd.img-$kver
3. systemctl restart kdump-tools.service
Mirroring this bug to Canonical for their inputs if to include the
missing hardware modules to the kdump initrd or to proceed with the
workaround.
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