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Message-ID: <202407161521.ec4d9668-lkp@intel.com>
Date: Tue, 16 Jul 2024 16:06:24 +0800
From: kernel test robot <oliver.sang@...el.com>
To: Oreoluwa Babatunde <quic_obabatun@...cinc.com>
CC: <oe-lkp@...ts.linux.dev>, <lkp@...el.com>, <devicetree@...r.kernel.org>,
	<iommu@...ts.linux.dev>, <robh@...nel.org>, <saravanak@...gle.com>,
	<klarasmodin@...il.com>, <aisheng.dong@....com>, <hch@....de>,
	<m.szyprowski@...sung.com>, <robin.murphy@....com>,
	<linux-kernel@...r.kernel.org>, <will@...nel.org>, <catalin.marinas@....com>,
	<kernel@...cinc.com>, Oreoluwa Babatunde <quic_obabatun@...cinc.com>,
	<oliver.sang@...el.com>
Subject: Re: [PATCH 3/4] Revert "of: reserved_mem: Use unflatten_devicetree
 APIs to scan reserved memory nodes"



Hello,

kernel test robot noticed "BUG:kernel_NULL_pointer_dereference,address" on:

commit: 50618d443add4eda4aa94c76fb56e72783c260ae ("[PATCH 3/4] Revert "of: reserved_mem: Use unflatten_devicetree APIs to scan reserved memory nodes"")
url: https://github.com/intel-lab-lkp/linux/commits/Oreoluwa-Babatunde/Revert-of-reserved_mem-Restructure-code-to-call-reserved-mem-init-functions-earlier/20240709-073454
base: https://git.kernel.org/cgit/linux/kernel/git/robh/linux.git for-next
patch subject: [PATCH 3/4] Revert "of: reserved_mem: Use unflatten_devicetree APIs to scan reserved memory nodes"

in testcase: boot

compiler: clang-18
test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G

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


+---------------------------------------------+------------+------------+
|                                             | 20cf0f8c96 | 50618d443a |
+---------------------------------------------+------------+------------+
| boot_successes                              | 18         | 0          |
| boot_failures                               | 0          | 18         |
| BUG:kernel_NULL_pointer_dereference,address | 0          | 18         |
| Oops                                        | 0          | 18         |
| RIP:fdt_ro_probe                            | 0          | 18         |
| Kernel_panic-not_syncing:Fatal_exception    | 0          | 18         |
+---------------------------------------------+------------+------------+


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@...el.com>
| Closes: https://lore.kernel.org/oe-lkp/202407161521.ec4d9668-lkp@intel.com


[    0.082892][    T0] BUG: kernel NULL pointer dereference, address: 0000000000000004
[    0.085157][    T0] #PF: supervisor read access in kernel mode
[    0.086877][    T0] #PF: error_code(0x0000) - not-present page
[    0.088532][    T0] PGD 0 P4D 0
[    0.089466][    T0] Oops: Oops: 0000 [#1] PREEMPT
[    0.090747][    T0] CPU: 0 PID: 0 Comm: swapper Tainted: G                T  6.10.0-rc1-00046-g50618d443add #1
[ 0.093729][ T0] RIP: 0010:fdt_ro_probe_ (scripts/dtc/libfdt/libfdt.h:? lib/../scripts/dtc/libfdt/fdt.c:?) 
[ 0.095168][ T0] Code: cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 b8 24 59 c7 5e b8 ed ff ff ff 40 f6 c7 07 74 07 31 c9 31 ff 31 d2 c3 <8b> 4f 04 8b 17 0f ca 81 fa 12 01 f2 2f 74 28 b8 f7 ff ff ff 81 fa
All code
========
   0:	cc                   	int3
   1:	cc                   	int3
   2:	cc                   	int3
   3:	cc                   	int3
   4:	cc                   	int3
   5:	cc                   	int3
   6:	cc                   	int3
   7:	cc                   	int3
   8:	90                   	nop
   9:	90                   	nop
   a:	90                   	nop
   b:	90                   	nop
   c:	90                   	nop
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	b8 24 59 c7 5e       	mov    $0x5ec75924,%eax
  18:	b8 ed ff ff ff       	mov    $0xffffffed,%eax
  1d:	40 f6 c7 07          	test   $0x7,%dil
  21:	74 07                	je     0x2a
  23:	31 c9                	xor    %ecx,%ecx
  25:	31 ff                	xor    %edi,%edi
  27:	31 d2                	xor    %edx,%edx
  29:	c3                   	ret
  2a:*	8b 4f 04             	mov    0x4(%rdi),%ecx		<-- trapping instruction
  2d:	8b 17                	mov    (%rdi),%edx
  2f:	0f ca                	bswap  %edx
  31:	81 fa 12 01 f2 2f    	cmp    $0x2ff20112,%edx
  37:	74 28                	je     0x61
  39:	b8 f7 ff ff ff       	mov    $0xfffffff7,%eax
  3e:	81                   	.byte 0x81
  3f:	fa                   	cli

Code starting with the faulting instruction
===========================================
   0:	8b 4f 04             	mov    0x4(%rdi),%ecx
   3:	8b 17                	mov    (%rdi),%edx
   5:	0f ca                	bswap  %edx
   7:	81 fa 12 01 f2 2f    	cmp    $0x2ff20112,%edx
   d:	74 28                	je     0x37
   f:	b8 f7 ff ff ff       	mov    $0xfffffff7,%eax
  14:	81                   	.byte 0x81
  15:	fa                   	cli
[    0.100859][    T0] RSP: 0000:ffffffff83e03e28 EFLAGS: 00010046
[    0.102634][    T0] RAX: 00000000ffffffed RBX: 0000000000000000 RCX: 0000000000000000
[    0.104925][    T0] RDX: 0000000000000010 RSI: ffffffff83ae68e5 RDI: 0000000000000000
[    0.107172][    T0] RBP: 0000000000000010 R08: 0000000000000000 R09: 0000000000000000
[    0.109427][    T0] R10: ffff88843fff2200 R11: 0000000000000000 R12: 0000000000000000
[    0.111656][    T0] R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff83ae68e5
[    0.113969][    T0] FS:  0000000000000000(0000) GS:ffffffff83eb3000(0000) knlGS:0000000000000000
[    0.116389][    T0] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    0.118314][    T0] CR2: 0000000000000004 CR3: 0000000003ea3000 CR4: 00000000000000b0
[    0.120569][    T0] Call Trace:
[    0.121512][    T0]  <TASK>
[ 0.122317][ T0] ? __die_body (arch/x86/kernel/dumpstack.c:421) 
[ 0.123615][ T0] ? page_fault_oops (arch/x86/mm/fault.c:711) 
[ 0.125110][ T0] ? console_flush_all (include/linux/rcupdate.h:? include/linux/srcu.h:232 kernel/printk/printk.c:286 kernel/printk/printk.c:2986) 
[ 0.126609][ T0] ? exc_page_fault (arch/x86/include/asm/paravirt.h:687) 
[ 0.127940][ T0] ? asm_exc_page_fault (arch/x86/include/asm/idtentry.h:623) 
[ 0.129365][ T0] ? fdt_ro_probe_ (scripts/dtc/libfdt/libfdt.h:? lib/../scripts/dtc/libfdt/fdt.c:?) 
[ 0.130637][ T0] ? fdt_path_offset_namelen (lib/../scripts/dtc/libfdt/fdt_ro.c:256) 
[ 0.132233][ T0] ? fdt_scan_reserved_mem_reg_nodes (drivers/of/of_reserved_mem.c:?) 
[ 0.134085][ T0] ? fdt_init_reserved_mem (drivers/of/of_reserved_mem.c:550) 
[ 0.135650][ T0] ? x86_flattree_get_config (arch/x86/kernel/devicetree.c:313) 
[ 0.137230][ T0] ? setup_arch (arch/x86/kernel/setup.c:1099) 
[ 0.138552][ T0] ? start_kernel (init/main.c:481 init/main.c:927) 
[ 0.139865][ T0] ? x86_64_start_reservations (??:?) 
[ 0.141519][ T0] ? x86_64_start_kernel (??:?) 
[ 0.142935][ T0] ? common_startup_64 (arch/x86/kernel/head_64.S:421) 
[    0.144349][    T0]  </TASK>
[    0.145232][    T0] Modules linked in:
[    0.146391][    T0] CR2: 0000000000000004
[    0.147628][    T0] ---[ end trace 0000000000000000 ]---
[ 0.149306][ T0] RIP: 0010:fdt_ro_probe_ (scripts/dtc/libfdt/libfdt.h:? lib/../scripts/dtc/libfdt/fdt.c:?) 
[ 0.150885][ T0] Code: cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 b8 24 59 c7 5e b8 ed ff ff ff 40 f6 c7 07 74 07 31 c9 31 ff 31 d2 c3 <8b> 4f 04 8b 17 0f ca 81 fa 12 01 f2 2f 74 28 b8 f7 ff ff ff 81 fa
All code
========
   0:	cc                   	int3
   1:	cc                   	int3
   2:	cc                   	int3
   3:	cc                   	int3
   4:	cc                   	int3
   5:	cc                   	int3
   6:	cc                   	int3
   7:	cc                   	int3
   8:	90                   	nop
   9:	90                   	nop
   a:	90                   	nop
   b:	90                   	nop
   c:	90                   	nop
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	b8 24 59 c7 5e       	mov    $0x5ec75924,%eax
  18:	b8 ed ff ff ff       	mov    $0xffffffed,%eax
  1d:	40 f6 c7 07          	test   $0x7,%dil
  21:	74 07                	je     0x2a
  23:	31 c9                	xor    %ecx,%ecx
  25:	31 ff                	xor    %edi,%edi
  27:	31 d2                	xor    %edx,%edx
  29:	c3                   	ret
  2a:*	8b 4f 04             	mov    0x4(%rdi),%ecx		<-- trapping instruction
  2d:	8b 17                	mov    (%rdi),%edx
  2f:	0f ca                	bswap  %edx
  31:	81 fa 12 01 f2 2f    	cmp    $0x2ff20112,%edx
  37:	74 28                	je     0x61
  39:	b8 f7 ff ff ff       	mov    $0xfffffff7,%eax
  3e:	81                   	.byte 0x81
  3f:	fa                   	cli

Code starting with the faulting instruction
===========================================
   0:	8b 4f 04             	mov    0x4(%rdi),%ecx
   3:	8b 17                	mov    (%rdi),%edx
   5:	0f ca                	bswap  %edx
   7:	81 fa 12 01 f2 2f    	cmp    $0x2ff20112,%edx
   d:	74 28                	je     0x37
   f:	b8 f7 ff ff ff       	mov    $0xfffffff7,%eax
  14:	81                   	.byte 0x81
  15:	fa                   	cli


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20240716/202407161521.ec4d9668-lkp@intel.com



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


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