* [tglx-devel:rseq/slice-v2] [x86/uaccess] ca5d17f701: BUG:unable_to_handle_page_fault_for_address
@ 2025-10-20 8:33 kernel test robot
0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2025-10-20 8:33 UTC (permalink / raw)
To: Thomas Gleixner; +Cc: oe-lkp, lkp, oliver.sang
Hello,
kernel test robot noticed "BUG:unable_to_handle_page_fault_for_address" on:
commit: ca5d17f701a68fca8bf2f0cce176d88fbc3ac18e ("x86/uaccess: Use unsafe wrappers for ASM GOTO")
https://git.kernel.org/cgit/linux/kernel/git/tglx/devel.git rseq/slice-v2
in testcase: boot
config: i386-randconfig-141-20251018
compiler: gcc-14
test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 4G
(please refer to attached dmesg/kmsg for entire log/backtrace)
+---------------------------------------------+------------+------------+
| | 8a11b88211 | ca5d17f701 |
+---------------------------------------------+------------+------------+
| boot_successes | 12 | 0 |
| boot_failures | 0 | 12 |
| BUG:unable_to_handle_page_fault_for_address | 0 | 12 |
| Oops:Oops:#[##] | 0 | 12 |
| EIP:copy_to_kernel_nofault | 0 | 12 |
| Kernel_panic-not_syncing:Fatal_exception | 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/202510201601.c47d1c7c-lkp@intel.com
[ 0.117637][ T0] BUG: unable to handle page fault for address: ffdab000
[ 0.119989][ T0] #PF: supervisor write access in kernel mode
[ 0.120741][ T0] #PF: error_code(0x0003) - permissions violation
[ 0.121536][ T0] *pde = 0741f067 *pte = 0741d121
[ 0.122171][ T0] Oops: Oops: 0003 [#1]
[ 0.122685][ T0] CPU: 0 UID: 0 PID: 0 Comm: swapper Tainted: G T 6.18.0-rc1-00003-gca5d17f701a6 #1 PREEMPT(undef)
[ 0.124227][ T0] Tainted: [T]=RANDSTRUCT
[ 0.124758][ T0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[ 0.126055][ T0] EIP: copy_to_kernel_nofault (mm/maccess.c:78 (discriminator 7))
[ 0.126746][ T0] Code: 83 f9 03 76 12 8b 36 89 30 83 e9 04 eb ea 66 8b 36 66 89 30 83 e9 02 89 d8 89 d6 29 c8 29 ce 83 f9 01 77 ea 85 c9 74 04 8a 16 <88> 10 e8 d1 fd ff ff 31 c0 eb 11 89 30 eb 03 66 89 30 e8 c1 fd ff
All code
========
0: 83 f9 03 cmp $0x3,%ecx
3: 76 12 jbe 0x17
5: 8b 36 mov (%rsi),%esi
7: 89 30 mov %esi,(%rax)
9: 83 e9 04 sub $0x4,%ecx
c: eb ea jmp 0xfffffffffffffff8
e: 66 8b 36 mov (%rsi),%si
11: 66 89 30 mov %si,(%rax)
14: 83 e9 02 sub $0x2,%ecx
17: 89 d8 mov %ebx,%eax
19: 89 d6 mov %edx,%esi
1b: 29 c8 sub %ecx,%eax
1d: 29 ce sub %ecx,%esi
1f: 83 f9 01 cmp $0x1,%ecx
22: 77 ea ja 0xe
24: 85 c9 test %ecx,%ecx
26: 74 04 je 0x2c
28: 8a 16 mov (%rsi),%dl
2a:* 88 10 mov %dl,(%rax) <-- trapping instruction
2c: e8 d1 fd ff ff call 0xfffffffffffffe02
31: 31 c0 xor %eax,%eax
33: eb 11 jmp 0x46
35: 89 30 mov %esi,(%rax)
37: eb 03 jmp 0x3c
39: 66 89 30 mov %si,(%rax)
3c: e8 .byte 0xe8
3d: c1 fd ff sar $0xff,%ebp
Code starting with the faulting instruction
===========================================
0: 88 10 mov %dl,(%rax)
2: e8 d1 fd ff ff call 0xfffffffffffffdd8
7: 31 c0 xor %eax,%eax
9: eb 11 jmp 0x1c
b: 89 30 mov %esi,(%rax)
d: eb 03 jmp 0x12
f: 66 89 30 mov %si,(%rax)
12: e8 .byte 0xe8
13: c1 fd ff sar $0xff,%ebp
[ 0.129208][ T0] EAX: ffdab000 EBX: ffdab001 ECX: 00000001 EDX: 46d95f00
[ 0.129871][ T0] ESI: 46d95f77 EDI: 073bf9e0 EBP: 46d95f68 ESP: 46d95f60
[ 0.130457][ T0] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAGS: 00210002
[ 0.131138][ T0] CR0: 80050033 CR2: ffdab000 CR3: 0741c000 CR4: 00000090
[ 0.136052][ T0] Call Trace:
[ 0.136467][ T0] ? mem_init (arch/x86/mm/init_32.c:675 (discriminator 2) arch/x86/mm/init_32.c:720 (discriminator 2))
[ 0.137012][ T0] ? mm_core_init (mm/mm_init.c:2708)
[ 0.137612][ T0] ? start_kernel (init/main.c:972)
[ 0.138215][ T0] ? i386_start_kernel (arch/x86/kernel/head32.c:129)
[ 0.138833][ T0] ? startup_32_smp (arch/x86/kernel/head_32.S:293)
[ 0.139459][ T0] Modules linked in:
[ 0.139843][ T0] CR2: 00000000ffdab000
[ 0.140232][ T0] ---[ end trace 0000000000000000 ]---
[ 0.140753][ T0] EIP: copy_to_kernel_nofault (mm/maccess.c:78 (discriminator 7))
[ 0.141311][ T0] Code: 83 f9 03 76 12 8b 36 89 30 83 e9 04 eb ea 66 8b 36 66 89 30 83 e9 02 89 d8 89 d6 29 c8 29 ce 83 f9 01 77 ea 85 c9 74 04 8a 16 <88> 10 e8 d1 fd ff ff 31 c0 eb 11 89 30 eb 03 66 89 30 e8 c1 fd ff
All code
========
0: 83 f9 03 cmp $0x3,%ecx
3: 76 12 jbe 0x17
5: 8b 36 mov (%rsi),%esi
7: 89 30 mov %esi,(%rax)
9: 83 e9 04 sub $0x4,%ecx
c: eb ea jmp 0xfffffffffffffff8
e: 66 8b 36 mov (%rsi),%si
11: 66 89 30 mov %si,(%rax)
14: 83 e9 02 sub $0x2,%ecx
17: 89 d8 mov %ebx,%eax
19: 89 d6 mov %edx,%esi
1b: 29 c8 sub %ecx,%eax
1d: 29 ce sub %ecx,%esi
1f: 83 f9 01 cmp $0x1,%ecx
22: 77 ea ja 0xe
24: 85 c9 test %ecx,%ecx
26: 74 04 je 0x2c
28: 8a 16 mov (%rsi),%dl
2a:* 88 10 mov %dl,(%rax) <-- trapping instruction
2c: e8 d1 fd ff ff call 0xfffffffffffffe02
31: 31 c0 xor %eax,%eax
33: eb 11 jmp 0x46
35: 89 30 mov %esi,(%rax)
37: eb 03 jmp 0x3c
39: 66 89 30 mov %si,(%rax)
3c: e8 .byte 0xe8
3d: c1 fd ff sar $0xff,%ebp
Code starting with the faulting instruction
===========================================
0: 88 10 mov %dl,(%rax)
2: e8 d1 fd ff ff call 0xfffffffffffffdd8
7: 31 c0 xor %eax,%eax
9: eb 11 jmp 0x1c
b: 89 30 mov %esi,(%rax)
d: eb 03 jmp 0x12
f: 66 89 30 mov %si,(%rax)
12: e8 .byte 0xe8
13: c1 fd ff sar $0xff,%ebp
The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20251020/202510201601.c47d1c7c-lkp@intel.com
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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2025-10-20 8:33 [tglx-devel:rseq/slice-v2] [x86/uaccess] ca5d17f701: BUG:unable_to_handle_page_fault_for_address kernel test robot
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