linux-kernel - Warning from free_init

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Date:   Sat, 24 Sep 2016 16:32:22 +0100
From:   Sitsofe Wheeler <sitsofe@...il.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Warning from free_init_pages with large initrd

Hi,

While trying to PXE boot a Fedora LiveISO on VMware ESXi the kernel
throws the following warning:

[    0.955216] Unpacking initramfs...
[    5.391977] ------------[ cut here ]------------
[    5.391986] WARNING: CPU: 0 PID: 1 at arch/x86/mm/init.c:671 free_init_pages+0x94/0xa0
[    5.391988] Modules linked in:
[    5.391992] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.8.0-0.rc7.git2.1.fc26.x86_64 #1
[    5.391993] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 09/30/2014
[    5.391995]  0000000000000286 00000000c1677634 ffff9d943abffd58 ffffffffb6467073
[    5.391999]  0000000000000000 0000000000000000 ffff9d943abffd98 ffffffffb60ae7ab
[    5.392001]  0000029fb71cab9d ffff9d9300000000 ffff9d9380000000 ffff9d9329861000
[    5.392003] Call Trace:
[    5.392008]  [<ffffffffb6467073>] dump_stack+0x86/0xc3
[    5.392020]  [<ffffffffb60ae7ab>] __warn+0xcb/0xf0
[    5.392022]  [<ffffffffb60ae8dd>] warn_slowpath_null+0x1d/0x20
[    5.392024]  [<ffffffffb606b094>] free_init_pages+0x94/0xa0
[    5.392027]  [<ffffffffb71cabe3>] ? unpack_to_rootfs+0x29d/0x29d
[    5.392039]  [<ffffffffb71c88cd>] ? set_debug_rodata+0x12/0x12
[    5.392042]  [<ffffffffb71e6aee>] free_initrd_mem+0x21/0x23
[    5.392044]  [<ffffffffb71cacc8>] populate_rootfs+0xe5/0x105
[    5.392046]  [<ffffffffb6002190>] do_one_initcall+0x50/0x180
[    5.392048]  [<ffffffffb71c88cd>] ? set_debug_rodata+0x12/0x12
[    5.392049]  [<ffffffffb71c923b>] kernel_init_freeable+0x200/0x29c
[    5.392053]  [<ffffffffb68e6b4e>] kernel_init+0xe/0x100
[    5.392055]  [<ffffffffb68f7b2f>] ret_from_fork+0x1f/0x40
[    5.392056]  [<ffffffffb68e6b40>] ? rest_init+0x140/0x140
[    5.392062] ---[ end trace 0fbf5e487fcf7e56 ]---
[    6.572994] Freeing initrd memory: 1416828K (ffff9d9329861000 - ffff9d9380000000)

The initrd is big because it holds all the files in the ISO (see
https://fedorahosted.org/cobbler/wiki/HowToPxeAnyLiveCd for how it was
made). The issue was originally filed on
https://bugzilla.redhat.com/show_bug.cgi?id=1274966 but was usually
against older kernels...

-- 
Sitsofe | http://sucs.org/~sits/