[rppt:mem_init/v2] [arch, mm] a4dbe5c718: kernel_BUG_at_arch/x86/mm/physaddr.c

[rppt:mem_init/v2] [arch, mm] a4dbe5c718: kernel_BUG_at_arch/x86/mm/physaddr.c

[kernel test robot]

Hello,

kernel test robot noticed "kernel_BUG_at_arch/x86/mm/physaddr.c" on:

commit: a4dbe5c718171ae59dbb50340e6ec10a1e48b6a7 ("arch, mm: set high_memory in free_area_init()")
https://git.kernel.org/cgit/linux/kernel/git/rppt/linux.git mem_init/v2

in testcase: boot

config: i386-randconfig-001-20250318
compiler: clang-20
test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 4G

(please refer to attached dmesg/kmsg for entire log/backtrace)


+---------------------------------------------+------------+------------+
|                                             | 098f7ccb0b | a4dbe5c718 |
+---------------------------------------------+------------+------------+
| kernel_BUG_at_arch/x86/mm/physaddr.c        | 0          | 12         |
| PANIC:early_exception                       | 0          | 12         |
| EIP:__phys_addr                             | 0          | 12         |
+---------------------------------------------+------------+------------+


If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <oliver.sang@intel.com>
| Closes: https://lore.kernel.org/oe-lkp/202503191442.112e954f-lkp@intel.com


[    0.055742][    T0] ------------[ cut here ]------------
[    0.056128][    T0] kernel BUG at arch/x86/mm/physaddr.c:77!
PANIC: early exception 0x06 IP 60:c116539d error 0 cr2 0x0
[    0.056916][    T0] CPU: 0 UID: 0 PID: 0 Comm: swapper Not tainted 6.14.0-rc4-00010-ga4dbe5c71817 #1
[    0.057570][    T0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[ 0.058299][ T0] EIP: __phys_addr (arch/x86/mm/physaddr.c:77) 
[ 0.058633][ T0] Code: 00 74 33 89 f0 e8 d3 8b 2e 00 89 c3 0f b6 d0 b8 58 bb 4b c5 31 c9 6a 00 e8 70 f5 15 00 83 c4 04 84 db 74 25 ff 05 78 de 5d c5 <0f> 0b b8 c8 91 ea c4 e8 e7 6e ea ff b8 58 bb 4b c5 31 d2 31 c9 6a
All code
========
   0:	00 74 33 89          	add    %dh,-0x77(%rbx,%rsi,1)
   4:	f0 e8 d3 8b 2e 00    	lock call 0x2e8bdd
   a:	89 c3                	mov    %eax,%ebx
   c:	0f b6 d0             	movzbl %al,%edx
   f:	b8 58 bb 4b c5       	mov    $0xc54bbb58,%eax
  14:	31 c9                	xor    %ecx,%ecx
  16:	6a 00                	push   $0x0
  18:	e8 70 f5 15 00       	call   0x15f58d
  1d:	83 c4 04             	add    $0x4,%esp
  20:	84 db                	test   %bl,%bl
  22:	74 25                	je     0x49
  24:	ff 05 78 de 5d c5    	incl   -0x3aa22188(%rip)        # 0xffffffffc55ddea2
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	b8 c8 91 ea c4       	mov    $0xc4ea91c8,%eax
  31:	e8 e7 6e ea ff       	call   0xffffffffffea6f1d
  36:	b8 58 bb 4b c5       	mov    $0xc54bbb58,%eax
  3b:	31 d2                	xor    %edx,%edx
  3d:	31 c9                	xor    %ecx,%ecx
  3f:	6a                   	.byte 0x6a

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	b8 c8 91 ea c4       	mov    $0xc4ea91c8,%eax
   7:	e8 e7 6e ea ff       	call   0xffffffffffea6ef3
   c:	b8 58 bb 4b c5       	mov    $0xc54bbb58,%eax
  11:	31 d2                	xor    %edx,%edx
  13:	31 c9                	xor    %ecx,%ecx
  15:	6a                   	.byte 0x6a
[    0.060017][    T0] EAX: 00000000 EBX: c61f7001 ECX: 00000000 EDX: 00000000
[    0.060519][    T0] ESI: c61f7000 EDI: 061f7000 EBP: c4e31f04 ESP: c61f7000
[    0.061016][    T0] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: cff4 EFLAGS: 00210002
[    0.061560][    T0] CR0: 80050033 CR2: 00000000 CR3: 059fc000 CR4: 00000090
[    0.062060][    T0] Call Trace:
[ 0.062288][ T0] ? show_regs (arch/x86/kernel/dumpstack.c:478) 
[ 0.062588][ T0] ? early_fixup_exception (arch/x86/include/asm/nospec-branch.h:595) 
[ 0.062968][ T0] ? early_idt_handler_common (arch/x86/kernel/head_32.S:352) 
[ 0.063360][ T0] ? __phys_addr (arch/x86/mm/physaddr.c:77) 
[ 0.063677][ T0] ? one_page_table_init (arch/x86/mm/init_32.c:100) 
[ 0.064037][ T0] ? page_table_range_init (arch/x86/mm/init_32.c:227) 
[ 0.064411][ T0] ? permanent_kmaps_init (include/linux/pgtable.h:191 include/linux/pgtable.h:196 arch/x86/mm/init_32.c:395) 
[ 0.064814][ T0] ? paging_init (arch/x86/mm/init_32.c:677) 
[ 0.065118][ T0] ? native_pagetable_init (arch/x86/mm/init_32.c:481) 
[ 0.065503][ T0] ? setup_arch (arch/x86/kernel/setup.c:1131) 
[ 0.065819][ T0] ? start_kernel (include/linux/jump_label.h:267 init/main.c:920) 
[ 0.066143][ T0] ? i386_start_kernel (arch/x86/kernel/head32.c:79) 
[ 0.066501][ T0] ? startup_32_smp (arch/x86/kernel/head_32.S:292) 
Linux version 6.14.0-rc4-00010-ga4dbe5c71817 #1
Command line: ip=::::vm-meta-84::dhcp root=/dev/ram0 RESULT_ROOT=/result/boot/1/vm-snb-i386/quantal-i386-core-20190426.cgz/i386-randconfig-001-20250318/clang-20/a4dbe5c718171ae59dbb50340e6ec10a1e48b6a7/0 BOOT_IMAGE=/pkg/linux/i386-randconfig-001-20250318/clang-20/a4dbe5c718171ae59dbb50340e6ec10a1e48b6a7/vmlinuz-6.14.0-rc4-00010-ga4dbe5c71817 branch=linux-devel/devel-hourly-20250317-162326 job=/lkp/jobs/scheduled/vm-meta-84/boot-1-quantal-i386-core-20190426.cgz-i386-randconfig-001-20250318-a4dbe5c71817-20250319-59448-u28vpj-1.yaml user=lkp ARCH=i386 kconfig=i386-randconfig-001-20250318 commit=a4dbe5c718171ae59dbb50340e6ec10a1e48b6a7 mem=4G intremap=posted_msi vmalloc=256M initramfs_async=0 page_owner=on carrier_timeout=60 rcupdate.rcu_self_test=0 max_uptime=600 LKP_SERVER=internal-lkp-server selinux=0 debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 net.ifnames=0 printk.devkmsg=on panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0 drbd.minor_count=8 systemd.log_level=err ignore_loglevel console=tty0 earlyprintk=ttyS0,115200 console=ttyS0,115200 vga=normal rw rcuperf.shutdown=0 rcuscale.shutdown=0 refscale.shutdown=0 watchdog_thresh=240 audit=0 kunit.enable=0 ia32_emulation=on riscv_isa_fallback=1



The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20250319/202503191442.112e954f-lkp@intel.com



-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki