SRU request submitted:
https://lists.ubuntu.com/archives/kernel-team/2018-February/090255.html
** Also affects: linux (Ubuntu Bionic)
Importance: Critical
Assignee: Joseph Salisbury (jsalisbury)
Status: In Progress
** Changed in: linux (Ubuntu Bionic)
Status: In Progress => Fix Committed
** Description changed:
+ == SRU Justification ==
+ IBM is seeing a crash on Power9 when running on Artful.
+ This issue happens only when disabling RPT ("disable_radix"), which is not
the default in Artful.
+
+
+ These fixes are already in Bionic master-next, so they are only being
requested
+ in Artful.
+
+ == Fixes ==
+ 63ee9b2ff9d3 ("powerpc/mm/book3s64: Make KERN_IO_START a variable")
+ b5048de04b32 ("powerpc/mm/slb: Move comment next to the code it's")
+ 21a0e8c14bf6 ("powerpc/mm/hash64: Make vmalloc 56T on hash")
+
+ == Regression Potential ==
+ These commits are specific to powerpc and fix a crash.
+
+ == Test Case ==
+ A test kernel was built with these patches and tested by the original bug
reporter.
+ The bug reporter states the test kernel resolved the bug.
+
+
== Comment: #0 - Breno Leitao - 2017-12-19 09:48:10 ==
When running Ubuntu 17.10 on POWER9, I got the following error:
[409038.118908] WARNING: CPU: 47 PID: 294 at
/build/linux-LIHoWc/linux-4.13.0/mm/vmalloc.c:2527 pcpu_get_vm_areas+0x62c/0x660
[409038.118909] Modules linked in: xt_CHECKSUM iptable_mangle ipt_MASQUERADE
nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4
nf_defrag_ipv4 xt_conntrack nf_conntrack libcrc32c ipt_REJECT nf_reject_ipv4
xt_tcpudp bridge stp llc ebtable_filter ebtables ip6table_filter ip6_tables
iptable_filter kvm_hv kvm at24 ofpart ipmi_powernv ipmi_devintf ipmi_msghandler
cmdlinepart powernv_flash uio_pdrv_genirq uio mtd vmx_crypto ibmpowernv
crct10dif_vpmsum opal_prd binfmt_misc ip_tables x_tables autofs4 crc32c_vpmsum
ast i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops
ttm drm tg3 ahci libahci
[409038.118933] CPU: 47 PID: 294 Comm: kworker/47:0 Tainted: G W
4.13.0-12-generic #13-Ubuntu
[409038.118934] Workqueue: events pcpu_balance_workfn
[409038.118936] task: c000003fe3cdcc00 task.stack: c000003fe3be0000
[409038.118937] NIP: c00000000032c1fc LR: c0000000002f5fd4 CTR:
0000000000000000
[409038.118937] REGS: c000003fe3be3810 TRAP: 0700 Tainted: G W
(4.13.0-12-generic)
[409038.118938] MSR: 900000000282b033 <SF,HV,VEC,VSX,EE,FP,ME,IR,DR,RI,LE>
[409038.118944] CR: 24024828 XER: 20040000
[409038.118944] CFAR: c00000000032bdb8 SOFTE: 1
- GPR00: 000020000df00000 c000003fe3be3a90 c0000000015e3000
c000203fff6b6880
- GPR04: c000203fff223608 0000000000000008 c000203fff6b6888
0000000000000000
- GPR08: 000020000df00000 0000080000000000 0000000001600000
c000203fff6b6888
- GPR12: 0000000000000002 c00000000faded80 c000000000f6c050
c000003fe3be3bc0
- GPR16: 0000000000100000 0000000000000000 c00000000189daf8
c000203fff223608
- GPR20: 000020000f500000 c000203fff2235f8 c000203fff223600
0000000000000000
- GPR24: 0000000000000000 c000203fff6b6888 0000000000000001
000020000f500000
- GPR28: 0000000000000002 00000000000fffff d000080000000000
d000000000000000
+ GPR00: 000020000df00000 c000003fe3be3a90 c0000000015e3000
c000203fff6b6880
+ GPR04: c000203fff223608 0000000000000008 c000203fff6b6888
0000000000000000
+ GPR08: 000020000df00000 0000080000000000 0000000001600000
c000203fff6b6888
+ GPR12: 0000000000000002 c00000000faded80 c000000000f6c050
c000003fe3be3bc0
+ GPR16: 0000000000100000 0000000000000000 c00000000189daf8
c000203fff223608
+ GPR20: 000020000f500000 c000203fff2235f8 c000203fff223600
0000000000000000
+ GPR24: 0000000000000000 c000203fff6b6888 0000000000000001
000020000f500000
+ GPR28: 0000000000000002 00000000000fffff d000080000000000
d000000000000000
[409038.118963] NIP [c00000000032c1fc] pcpu_get_vm_areas+0x62c/0x660
[409038.118964] LR [c0000000002f5fd4] pcpu_create_chunk+0xb4/0x1b0
[409038.118965] Call Trace:
[409038.118966] [c000003fe3be3a90] [c000003fe3be3ad0] 0xc000003fe3be3ad0
(unreliable)
[409038.118968] [c000003fe3be3b60] [c0000000002f5fd4]
pcpu_create_chunk+0xb4/0x1b0
[409038.118970] [c000003fe3be3ba0] [c0000000002f7890]
pcpu_balance_workfn+0x600/0x960
[409038.118972] [c000003fe3be3ca0] [c0000000001205d8]
process_one_work+0x298/0x5a0
[409038.118975] [c000003fe3be3d30] [c000000000120968] worker_thread+0x88/0x620
[409038.118977] [c000003fe3be3dc0] [c00000000012980c] kthread+0x1ac/0x1c0
[409038.118979] [c000003fe3be3e30] [c00000000000b4e8]
ret_from_kernel_thread+0x5c/0x74
[409038.118980] Instruction dump:
[409038.118981] eae30000 4191fad0 7ed3b378 e9210030 7efbbb78 7c791b78
3b400000 e9530000
-
---uname output---
4.13.0-12-generic
== Comment: #3 - ANEESH K. K V - 2017-12-20 05:59:13 ==
https://lkml.kernel.org/r/1501583364-14909-1-git-send-email-...@ellerman.id.au
The above may be related?
Related discussions
https://lkml.kernel.org/r/20170724134240.gl25...@dhcp22.suse.cz
-aneesh
== Comment: #4 - Breno Leitao - 2017-12-20 09:48:07 ==
I just tested with kernel 4.15.0-041500rc4 and I didn't see a problem so far.
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https://bugs.launchpad.net/bugs/1739498
Title:
Ubuntu 17.10 crashes on vmalloc.c
Status in The Ubuntu-power-systems project:
In Progress
Status in linux package in Ubuntu:
Fix Committed
Status in linux source package in Artful:
In Progress
Status in linux source package in Bionic:
Fix Committed
Bug description:
== SRU Justification ==
IBM is seeing a crash on Power9 when running on Artful.
This issue happens only when disabling RPT ("disable_radix"), which is not
the default in Artful.
These fixes are already in Bionic master-next, so they are only being
requested
in Artful.
== Fixes ==
63ee9b2ff9d3 ("powerpc/mm/book3s64: Make KERN_IO_START a variable")
b5048de04b32 ("powerpc/mm/slb: Move comment next to the code it's")
21a0e8c14bf6 ("powerpc/mm/hash64: Make vmalloc 56T on hash")
== Regression Potential ==
These commits are specific to powerpc and fix a crash.
== Test Case ==
A test kernel was built with these patches and tested by the original bug
reporter.
The bug reporter states the test kernel resolved the bug.
== Comment: #0 - Breno Leitao - 2017-12-19 09:48:10 ==
When running Ubuntu 17.10 on POWER9, I got the following error:
[409038.118908] WARNING: CPU: 47 PID: 294 at
/build/linux-LIHoWc/linux-4.13.0/mm/vmalloc.c:2527 pcpu_get_vm_areas+0x62c/0x660
[409038.118909] Modules linked in: xt_CHECKSUM iptable_mangle ipt_MASQUERADE
nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4
nf_defrag_ipv4 xt_conntrack nf_conntrack libcrc32c ipt_REJECT nf_reject_ipv4
xt_tcpudp bridge stp llc ebtable_filter ebtables ip6table_filter ip6_tables
iptable_filter kvm_hv kvm at24 ofpart ipmi_powernv ipmi_devintf ipmi_msghandler
cmdlinepart powernv_flash uio_pdrv_genirq uio mtd vmx_crypto ibmpowernv
crct10dif_vpmsum opal_prd binfmt_misc ip_tables x_tables autofs4 crc32c_vpmsum
ast i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops
ttm drm tg3 ahci libahci
[409038.118933] CPU: 47 PID: 294 Comm: kworker/47:0 Tainted: G W
4.13.0-12-generic #13-Ubuntu
[409038.118934] Workqueue: events pcpu_balance_workfn
[409038.118936] task: c000003fe3cdcc00 task.stack: c000003fe3be0000
[409038.118937] NIP: c00000000032c1fc LR: c0000000002f5fd4 CTR:
0000000000000000
[409038.118937] REGS: c000003fe3be3810 TRAP: 0700 Tainted: G W
(4.13.0-12-generic)
[409038.118938] MSR: 900000000282b033 <SF,HV,VEC,VSX,EE,FP,ME,IR,DR,RI,LE>
[409038.118944] CR: 24024828 XER: 20040000
[409038.118944] CFAR: c00000000032bdb8 SOFTE: 1
GPR00: 000020000df00000 c000003fe3be3a90 c0000000015e3000
c000203fff6b6880
GPR04: c000203fff223608 0000000000000008 c000203fff6b6888
0000000000000000
GPR08: 000020000df00000 0000080000000000 0000000001600000
c000203fff6b6888
GPR12: 0000000000000002 c00000000faded80 c000000000f6c050
c000003fe3be3bc0
GPR16: 0000000000100000 0000000000000000 c00000000189daf8
c000203fff223608
GPR20: 000020000f500000 c000203fff2235f8 c000203fff223600
0000000000000000
GPR24: 0000000000000000 c000203fff6b6888 0000000000000001
000020000f500000
GPR28: 0000000000000002 00000000000fffff d000080000000000
d000000000000000
[409038.118963] NIP [c00000000032c1fc] pcpu_get_vm_areas+0x62c/0x660
[409038.118964] LR [c0000000002f5fd4] pcpu_create_chunk+0xb4/0x1b0
[409038.118965] Call Trace:
[409038.118966] [c000003fe3be3a90] [c000003fe3be3ad0] 0xc000003fe3be3ad0
(unreliable)
[409038.118968] [c000003fe3be3b60] [c0000000002f5fd4]
pcpu_create_chunk+0xb4/0x1b0
[409038.118970] [c000003fe3be3ba0] [c0000000002f7890]
pcpu_balance_workfn+0x600/0x960
[409038.118972] [c000003fe3be3ca0] [c0000000001205d8]
process_one_work+0x298/0x5a0
[409038.118975] [c000003fe3be3d30] [c000000000120968] worker_thread+0x88/0x620
[409038.118977] [c000003fe3be3dc0] [c00000000012980c] kthread+0x1ac/0x1c0
[409038.118979] [c000003fe3be3e30] [c00000000000b4e8]
ret_from_kernel_thread+0x5c/0x74
[409038.118980] Instruction dump:
[409038.118981] eae30000 4191fad0 7ed3b378 e9210030 7efbbb78 7c791b78
3b400000 e9530000
---uname output---
4.13.0-12-generic
== Comment: #3 - ANEESH K. K V - 2017-12-20 05:59:13 ==
https://lkml.kernel.org/r/1501583364-14909-1-git-send-email-...@ellerman.id.au
The above may be related?
Related discussions
https://lkml.kernel.org/r/20170724134240.gl25...@dhcp22.suse.cz
-aneesh
== Comment: #4 - Breno Leitao - 2017-12-20 09:48:07 ==
I just tested with kernel 4.15.0-041500rc4 and I didn't see a problem so far.
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