linux-kernel - problem starting /sbin/init (32-bit 5.3-rc8)

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Date:   Thu, 12 Sep 2019 14:40:19 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     LKML <linux-kernel@...r.kernel.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Kees Cook <keescook@...omium.org>, X86 ML <x86@...nel.org>,
        Oleg Nesterov <oleg@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: problem starting /sbin/init (32-bit 5.3-rc8)

This is 32-bit kernel, just happens to be running on a 64-bit laptop.
I added the debug printk in __phys_addr() just before "[cut here]".

CONFIG_HARDENED_USERCOPY=y

The BUG is this line in arch/x86/mm/physaddr.c:
		VIRTUAL_BUG_ON((phys_addr >> PAGE_SHIFT) > max_low_pfn);
It's line 83 in my source file only due to adding <linux/printk.h> and
a conditional pr_crit() call.


[   19.730409][    T1] debug: unmapping init [mem 0xdc7bc000-0xdca30fff]
[   19.734289][    T1] Write protecting kernel text and read-only data: 13888k
[   19.737675][    T1] rodata_test: all tests were successful
[   19.740757][    T1] Run /sbin/init as init process
[   19.792877][    T1] __phys_addr: max_low_pfn=0x36ffe, x=0xff001ff1, phys_addr=0x3f001ff1
[   19.796561][    T1] ------------[ cut here ]------------
[   19.797501][    T1] kernel BUG at ../arch/x86/mm/physaddr.c:83!
[   19.802799][    T1] invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
[   19.803782][    T1] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 5.3.0-rc8 #6
[   19.803782][    T1] Hardware name: Dell Inc. Inspiron 1318                   /0C236D, BIOS A04 01/15/2009
[   19.803782][    T1] EIP: __phys_addr+0xaf/0x100
[   19.803782][    T1] Code: 85 c0 74 67 89 f7 c1 ef 0c 39 f8 73 2e 56 53 50 68 90 9f 1f dc 68 00 eb 45 dc e8 ec b3 09 00 83 c4 14 3b 3d 30 55 cf dc 76 11 <0f> 0b b8 7c 3b 5c dc e8 45 53 4c 00 90 8d 74 26 00 89 d8 e8 39 cd
[   19.803782][    T1] EAX: 00000044 EBX: ff001ff1 ECX: 00000000 EDX: db90a471
[   19.803782][    T1] ESI: 3f001ff1 EDI: 0003f001 EBP: f41ddea0 ESP: f41dde90
[   19.803782][    T1] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 EFLAGS: 00010216
[   19.803782][    T1] CR0: 80050033 CR2: dc218544 CR3: 1ca39000 CR4: 000406d0
[   19.803782][    T1] Call Trace:
[   19.803782][    T1]  __check_object_size+0xaf/0x3c0
[   19.803782][    T1]  ? __might_sleep+0x80/0xa0
[   19.803782][    T1]  copy_strings+0x1c2/0x370
[   19.803782][    T1]  copy_strings_kernel+0x2b/0x40
[   19.803782][    T1]  __do_execve_file+0x4ca/0x810
[   19.803782][    T1]  ? kmem_cache_alloc+0x1c7/0x370
[   19.803782][    T1]  do_execve+0x1b/0x20
[   19.803782][    T1]  run_init_process+0x31/0x40
[   19.803782][    T1]  try_to_run_init_process+0x11/0x40
[   19.803782][    T1]  kernel_init+0xda/0x120
[   19.803782][    T1]  ? rest_init+0x130/0x130
[   19.803782][    T1]  ret_from_fork+0x2e/0x38
[   19.803782][    T1] Modules linked in:
[   19.876679][    T1] ---[ end trace 2b8071cbe5f1eece ]---
[   19.879467][    T1] EIP: __phys_addr+0xaf/0x100
[   19.882125][    T1] Code: 85 c0 74 67 89 f7 c1 ef 0c 39 f8 73 2e 56 53 50 68 90 9f 1f dc 68 00 eb 45 dc e8 ec b3 09 00 83 c4 14 3b 3d 30 55 cf dc 76 11 <0f> 0b b8 7c 3b 5c dc e8 45 53 4c 00 90 8d 74 26 00 89 d8 e8 39 cd
[   19.889474][    T1] EAX: 00000044 EBX: ff001ff1 ECX: 00000000 EDX: db90a471
[   19.892635][    T1] ESI: 3f001ff1 EDI: 0003f001 EBP: f41ddea0 ESP: f41dde90
[   19.895806][    T1] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 EFLAGS: 00010216
[   19.899106][    T1] CR0: 80050033 CR2: dc218544 CR3: 1ca39000 CR4: 000406d0
[   19.902276][    T1] Kernel panic - not syncing: Fatal exception
[   19.903268][    T1] Kernel Offset: 0x1a800000 from 0xc1000000 (relocation range: 0xc0000000-0xf77fdfff)
[   19.903268][    T1] ---[ end Kernel panic - not syncing: Fatal exception ]---


Full boot log or kernel .config file are available if wanted.

-- 
~Randy