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SubjectRe: [tip:x86/mm] [x86/mm] 1248fb6a82: Kernel_panic-not_syncing:kasan_populate_pmd:Failed_to_allocate_page
On Tue, Oct 25, 2022 at 12:54:40PM +0800, kernel test robot wrote:
> Hi Peter,
>
> We noticed that below commit changed the value of
> CPU_ENTRY_AREA_MAP_SIZE. Seems KASAN uses this value to allocate memory,
> and failed during initialization after this change, so we send this
> mail and Cc KASAN folks. Please kindly check below report for more
> details. Thanks.
>
>
> Greeting,
>
> FYI, we noticed Kernel_panic-not_syncing:kasan_populate_pmd:Failed_to_allocate_page due to commit (built with gcc-11):
>
> commit: 1248fb6a8201ddac1c86a202f05a0a1765efbfce ("x86/mm: Randomize per-cpu entry area")
> https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git x86/mm
>
> in testcase: boot
>
> on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G
>
> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
>
>
> [ 7.114808][ T0] Kernel panic - not syncing: kasan_populate_pmd+0x142/0x1d2: Failed to allocate page, nid=0 from=1000000
> [ 7.119742][ T0] CPU: 0 PID: 0 Comm: swapper Not tainted 6.1.0-rc1-00001-g1248fb6a8201 #1
> [ 7.122122][ T0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-debian-1.16.0-4 04/01/2014
> [ 7.124976][ T0] Call Trace:
> [ 7.125849][ T0] <TASK>
> [ 7.126642][ T0] ? dump_stack_lvl+0x45/0x5d
> [ 7.127908][ T0] ? panic+0x21e/0x46a
> [ 7.129009][ T0] ? panic_print_sys_info+0x77/0x77
> [ 7.130618][ T0] ? memblock_alloc_try_nid_raw+0x106/0x106
> [ 7.132224][ T0] ? memblock_alloc_try_nid+0xd9/0x118
> [ 7.133717][ T0] ? memblock_alloc_try_nid_raw+0x106/0x106
> [ 7.135252][ T0] ? kasan_populate_pmd+0x142/0x1d2
> [ 7.136655][ T0] ? early_alloc+0x95/0x9d
> [ 7.137738][ T0] ? kasan_populate_pmd+0x142/0x1d2
> [ 7.138936][ T0] ? kasan_populate_pud+0x182/0x19f
> [ 7.140335][ T0] ? kasan_populate_shadow+0x1e0/0x233
> [ 7.141759][ T0] ? kasan_init+0x3be/0x57f
> [ 7.142942][ T0] ? setup_arch+0x101d/0x11f0
> [ 7.144229][ T0] ? start_kernel+0x6f/0x3d0
> [ 7.145449][ T0] ? secondary_startup_64_no_verify+0xe0/0xeb
> [ 7.147051][ T0] </TASK>
> [ 7.147868][ T0] ---[ end Kernel panic - not syncing: kasan_populate_pmd+0x142/0x1d2: Failed to allocate page, nid=0 from=1000000 ]---

Ufff, no idea about what KASAN wants here; Andrey, you have clue?

Are you trying to allocate backing space for .5T of vspace and failing
that because the kvm thing doesn't have enough memory?

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