** Changed in: linux (Ubuntu Wily)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1463654
Title:
Kernel WARN @drivers/base/memory.c:200 during DLPAR memory operation
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Vivid:
Fix Committed
Status in linux source package in Wily:
Fix Committed
Status in linux source package in Xenial:
Fix Released
Bug description:
---Problem Description---
Kernel WARN @drivers/base/memory.c:200 during DLPAR memory operation
Contact Information = Sachin Sant / [email protected]
---uname output---
3.19.0-18-generic
---Patches Installed---
A patched powerpc-ibm-utils package is required
Machine Type = POWER8
---Debugger---
A debugger is not configured
---Steps to Reproduce---
1) Using latest daily ISO install 14.04.02 as a Power VM guest
2) Upgrade the kernel to 3.19 level (3.19.0-18-generic)
3) Ensure ksh and powerpc-ibm-utils packages are installed.
4) Download following DLPAR packages from
http://ausgsa.ibm.com/projects/r/rsctdev/builds/muthu/rmuts006a/ppc64le/
devices.chrp.base.servicerm_2.5.0.1-15111_ppc64el.deb
dynamicrm_2.0.1-3_ppc64el.deb
rsct.core_3.2.0.6-15111_ppc64el.deb
rsct.core.utils_3.2.0.6-15111_ppc64el.deb
src_3.2.0.6-15111_ppc64el.deb
5) Install the packages.
6) Perform a add memory operation via HMC
Stack trace output:
alp9 kernel: [44170.234662] ------------[ cut here ]------------
alp9 kernel: [44170.234667] WARNING: at
/build/buildd/linux-lts-vivid-3.19.0/drivers/base/memory.c:200
alp9 kernel: [44170.234668] Modules linked in: rpadlpar_io rpaphp pseries_rng
rtc_generic
alp9 kernel: [44170.234675] CPU: 2 PID: 1391 Comm: systemd-udevd Not tainted
3.19.0-18-generic #18~14.04.1-Ubuntu
alp9 kernel: [44170.234677] task: c0000003dbea7c80 ti: c0000003dbf10000
task.ti: c0000003dbf10000
Jun 4 19:44:47 alp9 kernel: [44170.234678] NIP: c000000000668f34 LR:
c0000000006699b0 CTR: 0000000000000000
Jun 4 19:44:47 alp9 kernel: [44170.234680] REGS: c0000003dbf13910 TRAP: 0700
Not tainted (3.19.0-18-generic)
Jun 4 19:44:47 alp9 kernel: [44170.234680] MSR: 8000000000029033
<SF,EE,ME,IR,DR,RI,LE> CR: 28042888 XER: 20000000
Jun 4 19:44:47 alp9 kernel: [44170.234686] CFAR: c000000000668ed8 SOFTE: 1
Jun 4 19:44:47 alp9 kernel: [44170.234686] GPR00: c0000000006699b0
c0000003dbf13b90 c00000000144c760 0000000000000001
Jun 4 19:44:47 alp9 kernel: [44170.234686] GPR04: 0000000000000779
0000000000000100 0000000000078000 f000000001de4000
Jun 4 19:44:47 alp9 kernel: [44170.234686] GPR08: c0000000013ac760
0000000000000001 0000000000007790 00000000003fffff
Jun 4 19:44:47 alp9 kernel: [44170.234686] GPR12: c00000000172cb00
c00000000e831200 00000100074a0010 0000000000000000
Jun 4 19:44:47 alp9 kernel: [44170.234686] GPR16: 0000000010032230
00000000100311d0 00003fffcb59bf20 0000000000000003
Jun 4 19:44:47 alp9 kernel: [44170.234686] GPR20: 00000000100527f8
00000000100322b0 0000000001312d00 00000100074af7f0
Jun 4 19:44:47 alp9 kernel: [44170.234686] GPR24: 00000000100322d0
00003fffcb59bf20 c0000003dbf13e00 0000000000000000
Jun 4 19:44:47 alp9 kernel: [44170.234686] GPR28: 0000000000001000
0000000000000000 0000000000077000 0000000000077900
Jun 4 19:44:47 alp9 kernel: [44170.234707] NIP [c000000000668f34]
pages_correctly_reserved+0x134/0x1c0
Jun 4 19:44:47 alp9 kernel: [44170.234709] LR [c0000000006699b0]
memory_subsys_online+0x70/0x140
Jun 4 19:44:47 alp9 kernel: [44170.234710] Call Trace:
Jun 4 19:44:47 alp9 kernel: [44170.234711] [c0000003dbf13b90]
[0000000000000006] 0x6 (unreliable)
Jun 4 19:44:47 alp9 kernel: [44170.234714] [c0000003dbf13c00]
[c0000000006699b0] memory_subsys_online+0x70/0x140
Jun 4 19:44:47 alp9 kernel: [44170.234716] [c0000003dbf13c40]
[c0000000006476f4] device_online+0xb4/0x120
Jun 4 19:44:47 alp9 kernel: [44170.234718] [c0000003dbf13c80]
[c00000000066987c] store_mem_state+0x8c/0x150
Jun 4 19:44:47 alp9 kernel: [44170.234721] [c0000003dbf13cc0]
[c000000000643618] dev_attr_store+0x68/0xa0
Jun 4 19:44:47 alp9 kernel: [44170.234724] [c0000003dbf13d00]
[c00000000035afd0] sysfs_kf_write+0x80/0xb0
Jun 4 19:44:47 alp9 kernel: [44170.234726] [c0000003dbf13d40]
[c000000000359f0c] kernfs_fop_write+0x18c/0x1f0
Jun 4 19:44:47 alp9 kernel: [44170.234730] [c0000003dbf13d90]
[c0000000002b450c] vfs_write+0xdc/0x260
Jun 4 19:44:47 alp9 kernel: [44170.234732] [c0000003dbf13de0]
[c0000000002b53bc] SyS_write+0x6c/0x110
Jun 4 19:44:47 alp9 kernel: [44170.234735] [c0000003dbf13e30]
[c000000000009258] system_call+0x38/0xd0
Jun 4 19:44:47 alp9 kernel: [44170.234736] Instruction dump:
Jun 4 19:44:47 alp9 kernel: [44170.234737] 419e0024 788a2428 7d095214
2fa80000 41de0014 7d29502a 38e74000 7928ffe3
Jun 4 19:44:47 alp9 kernel: [44170.234740] 4082ff7c 3d02fff6 892808e3
69290001 <0b090000> 2fa90000 40de0068 38600000
Jun 4 19:44:47 alp9 kernel: [44170.234744] ---[ end trace f8d28c560fa5c980
]---
System Dump Info:
The system is not configured to capture a system dump.
== Comment: #1 - SACHIN P. SANT <[email protected]> - 2015-06-05 01:28:00 ==
The DLPAR memory operation succeeds and is not affected by this warning.
== Comment: #3 - Nathan D. Fontenot <[email protected]> - 2015-06-05
07:11:45 ==
Looking at this issue further, it appears to only happen when adding memory
that was previously removed. When adding memory that has not been assigned to
the partition yet the warnings are not generated.
Need to look into the memory remove code paths to make sure we are
releasing the memory properly.
== Comment: #4 - Nathan D. Fontenot <[email protected]> - 2015-06-05
07:59:17 ==
I will have to verify in the Ubuntu source, but this seems like this is an
issue that was solved previously by commit
2bbcb8788311a40714b585fc11b51da6ffa2ab92.
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/base/memory.c?id=2bbcb8788311a40714b585fc11b51da6ffa2ab92
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