This bug was fixed in the package linux - 4.18.0-11.12
---------------
linux (4.18.0-11.12) cosmic; urgency=medium
* linux: 4.18.0-11.12 -proposed tracker (LP: #1799445)
* arm64: snapdragon: WARNING: CPU: 0 PID: 1 arch/arm64/kernel/setup.c:271
reserve_memblock_reserved_regions (LP: #1797139)
- SAUCE: arm64: Fix /proc/iomem for reserved but not memory regions
* arm64: snapdragon: WARNING: CPU: 0 PID: 1 at drivers/irqchip/irq-gic.c:1016
gic_irq_domain_translate (LP: #1797143)
- SAUCE: arm64: dts: msm8916: camms: fix gic_irq_domain_translate warnings
* The front MIC can't work on the Lenovo M715 (LP: #1797292)
- ALSA: hda/realtek - Fix the problem of the front MIC on the Lenovo M715
* Provide mode where all vCPUs on a core must be the same VM (LP: #1792957)
- KVM: PPC: Book3S HV: Provide mode where all vCPUs on a core must be the
same
VM
* fscache: bad refcounting in fscache_op_complete leads to OOPS (LP: #1797314)
- SAUCE: fscache: Fix race in decrementing refcount of op->npages
* hns3: autoneg settings get lost on down/up (LP: #1797654)
- net: hns3: Fix for information of phydev lost problem when down/up
* not able to unwind the stack from within __kernel_clock_gettime in the Linux
vDSO (LP: #1797963)
- powerpc/vdso: Correct call frame information
* Signal 7 error when running GPFS tracing in cluster (LP: #1792195)
- powerpc/mm/books3s: Add new pte bit to mark pte temporarily invalid.
- powerpc/mm/radix: Only need the Nest MMU workaround for R -> RW transition
* Support Edge Gateway's WIFI LED (LP: #1798330)
- SAUCE: mwifiex: Switch WiFi LED state according to the device status
* Support Edge Gateway's Bluetooth LED (LP: #1798332)
- SAUCE: Bluetooth: Support for LED on Edge Gateways
* kvm doesn't work on 36 physical bits systems (LP: #1798427)
- KVM: x86: fix L1TF's MMIO GFN calculation
* CVE-2018-15471
- xen-netback: fix input validation in xenvif_set_hash_mapping()
* regression in 'ip --family bridge neigh' since linux v4.12 (LP: #1796748)
- rtnetlink: fix rtnl_fdb_dump() for ndmsg header
-- Stefan Bader <stefan.ba...@canonical.com> Tue, 23 Oct 2018 18:59:15
+0200
** Changed in: linux (Ubuntu Cosmic)
Status: Invalid => Fix Released
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https://bugs.launchpad.net/bugs/1797139
Title:
arm64: snapdragon: WARNING: CPU: 0 PID: 1
arch/arm64/kernel/setup.c:271 reserve_memblock_reserved_regions
Status in linux package in Ubuntu:
Invalid
Status in linux source package in Bionic:
Fix Released
Status in linux source package in Cosmic:
Fix Released
Bug description:
Impact:
Upon boot on a dragonboard410c using a recent Bionic or Cosmic kernel:
...
[ 0.049776] WARNING: CPU: 0 PID: 1 at arch/arm64/kernel/setup.c:271
reserve_memblock_reserved_regions+0xe0/0x148
[ 0.049783] Modules linked in:
[ 0.049797] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.18.0-8-snapdragon
#9
[ 0.049803] Hardware name: Qualcomm Technologies, Inc. APQ 8016 SBC (DT)
[ 0.049813] pstate: 80400005 (Nzcv daif +PAN -UAO)
[ 0.049821] pc : reserve_memblock_reserved_regions+0xe0/0x148
[ 0.049829] lr : reserve_memblock_reserved_regions+0xd8/0x148
[ 0.049836] sp : ffff000008033d40
[ 0.049841] x29: ffff000008033d40 x28: 0000000000000000
[ 0.049852] x27: ffff000009410584 x26: ffff000009577018
[ 0.049863] x25: 0000000000000000 x24: 0000000000488020
[ 0.049874] x23: 00000000bfffffff x22: ffff0000090e8928
[ 0.049885] x21: ffff000008ffb578 x20: ffff000009a48708
[ 0.049896] x19: ffff80003a409280 x18: 0000000000000000
[ 0.049906] x17: 0000000000000000 x16: 0000000000000000
[ 0.049917] x15: ffffffffffffffff x14: ffff000009a48708
[ 0.049927] x13: 0000000000000000 x12: 0000000000000028
[ 0.049938] x11: 0101010101010101 x10: 7f7f7f7f7f7f7f7f
[ 0.049949] x9 : 0000000000000000 x8 : ffff80003a409300
[ 0.049959] x7 : 0000000000000000 x6 : 000000000000003f
[ 0.049969] x5 : 0000000000000040 x4 : ffff80003d9ffc70
[ 0.049980] x3 : 00000000bd9fffff x2 : ffff000009c241b0
[ 0.049990] x1 : 0000000000000000 x0 : 0000000000000000
[ 0.050001] Call trace:
[ 0.050010] reserve_memblock_reserved_regions+0xe0/0x148
[ 0.050021] do_one_initcall+0x54/0x1e0
[ 0.050031] kernel_init_freeable+0x254/0x2f8
[ 0.050043] kernel_init+0x18/0x110
[ 0.050052] ret_from_fork+0x10/0x18
[ 0.050063] ---[ end trace dc768b294fafe4aa ]---
...
commit 50d7ba36b916 upstream ("arm64: export memblock_reserve()d regions via
/proc/iomem") backported in commit 62289841 in bionic/master, wrongly assumed
that memblock_reserve() would not be used to reserve regions that aren't
memory. It turns out, this is exactly what early_init_dt_reserve_memory_arch()
will do if it finds a reservation
that was also carved out of the memory node.
Fix:
Apply the attached patch and recompile
The fix wad discussed here: https://www.spinics.net/lists/arm-
kernel/msg675580.html
How to test:
Boot the patched kernel and check for the above WARNING in dmesg
Regression potential:
The patch didn't make it upstream yet, but the fix is very small and
was tested on the lkml.
Proposing for Bionic and Cosmic.
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