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Date:   Thu, 26 Oct 2023 10:44:36 +0800
From:   kernel test robot <oliver.sang@intel.com>
To:     Juergen Gross <jgross@suse.com>
CC:     <oe-lkp@lists.linux.dev>, <lkp@intel.com>,
        Peter Zijlstra <peterz@infradead.org>,
        <linux-kernel@vger.kernel.org>,
        <virtualization@lists.linux-foundation.org>, <x86@kernel.org>,
        Juergen Gross <jgross@suse.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        "H. Peter Anvin" <hpa@zytor.com>, Ajay Kaher <akaher@vmware.com>,
        Alexey Makhalov <amakhalov@vmware.com>,
        "VMware PV-Drivers Reviewers" <pv-drivers@vmware.com>,
        <oliver.sang@intel.com>
Subject: Re: [PATCH v3 4/5] x86/paravirt: switch mixed paravirt/alternative
 calls to alternative_2
Message-ID: <202310261032.76a10bc0-oliver.sang@intel.com>
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Hello,

kernel test robot noticed "BUG:unable_to_handle_page_fault_for_address" on:

commit: b0b8b06548f7984351b503ec5f5c13fa80bae6a2 ("[PATCH v3 4/5] x86/paravirt: switch mixed paravirt/alternative calls to alternative_2")
url: https://github.com/intel-lab-lkp/linux/commits/Juergen-Gross/x86-paravirt-move-some-functions-and-defines-to-alternative/20231019-171709
base: https://git.kernel.org/cgit/virt/kvm/kvm.git queue
patch link: https://lore.kernel.org/all/20231019091520.14540-5-jgross@suse.com/
patch subject: [PATCH v3 4/5] x86/paravirt: switch mixed paravirt/alternative calls to alternative_2

in testcase: boot

compiler: gcc-12
test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G

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


+---------------------------------------------+------------+------------+
|                                             | efa1a70f0b | b0b8b06548 |
+---------------------------------------------+------------+------------+
| BUG:unable_to_handle_page_fault_for_address | 0          | 14         |
| Oops:#[##]                                  | 0          | 14         |
| EIP:apply_alternatives                      | 0          | 14         |
| Kernel_panic-not_syncing:Fatal_exception    | 0          | 14         |
+---------------------------------------------+------------+------------+


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/202310261032.76a10bc0-oliver.sang@intel.com


[    1.382500][    T0] BUG: unable to handle page fault for address: 84864e91
[    1.383633][    T0] #PF: supervisor read access in kernel mode
[    1.384579][    T0] #PF: error_code(0x0000) - not-present page
[    1.384579][    T0] *pde = 00000000
[    1.384579][    T0] Oops: 0000 [#1] PREEMPT SMP
[    1.384579][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.6.0-rc5-00101-gb0b8b06548f7 #1 7cb7f016c05986cc453a3ae4b37cd3712c62c0c0
[    1.384579][    T0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[ 1.384579][ T0] EIP: apply_alternatives (arch/x86/kernel/alternative.c:419 arch/x86/kernel/alternative.c:489) 
[ 1.384579][ T0] Code: 3c 06 0f 85 4e 02 00 00 8b 85 ec fe ff ff 80 38 ff 0f 85 3f 02 00 00 80 78 01 15 0f 85 35 02 00 00 8b 8d ec fe ff ff 8b 41 02 <8b> 44 01 06 85 c0 74 17 89 c2 81 ea 60 18 7c c2 01 95 f3 fe ff ff
All code
========
   0:	3c 06                	cmp    $0x6,%al
   2:	0f 85 4e 02 00 00    	jne    0x256
   8:	8b 85 ec fe ff ff    	mov    -0x114(%rbp),%eax
   e:	80 38 ff             	cmpb   $0xff,(%rax)
  11:	0f 85 3f 02 00 00    	jne    0x256
  17:	80 78 01 15          	cmpb   $0x15,0x1(%rax)
  1b:	0f 85 35 02 00 00    	jne    0x256
  21:	8b 8d ec fe ff ff    	mov    -0x114(%rbp),%ecx
  27:	8b 41 02             	mov    0x2(%rcx),%eax
  2a:*	8b 44 01 06          	mov    0x6(%rcx,%rax,1),%eax		<-- trapping instruction
  2e:	85 c0                	test   %eax,%eax
  30:	74 17                	je     0x49
  32:	89 c2                	mov    %eax,%edx
  34:	81 ea 60 18 7c c2    	sub    $0xc27c1860,%edx
  3a:	01 95 f3 fe ff ff    	add    %edx,-0x10d(%rbp)

Code starting with the faulting instruction
===========================================
   0:	8b 44 01 06          	mov    0x6(%rcx,%rax,1),%eax
   4:	85 c0                	test   %eax,%eax
   6:	74 17                	je     0x1f
   8:	89 c2                	mov    %eax,%edx
   a:	81 ea 60 18 7c c2    	sub    $0xc27c1860,%edx
  10:	01 95 f3 fe ff ff    	add    %edx,-0x10d(%rbp)
[    1.384579][    T0] EAX: c37e7374 EBX: c37b7e3a ECX: c107db17 EDX: 00000005
[    1.384579][    T0] ESI: c3ffc70a EDI: 00000000 EBP: c37b7f48 ESP: c37b7e00
[    1.384579][    T0] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00210246
[    1.384579][    T0] CR0: 80050033 CR2: 84864e91 CR3: 04037000 CR4: 000406d0
[    1.384579][    T0] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[    1.384579][    T0] DR6: fffe0ff0 DR7: 00000400
[    1.384579][    T0] Call Trace:
[ 1.384579][ T0] ? show_regs (arch/x86/kernel/dumpstack.c:479) 
[ 1.384579][ T0] ? __die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434) 
[ 1.384579][ T0] ? oops_enter (kernel/panic.c:627) 
[ 1.384579][ T0] ? page_fault_oops (arch/x86/mm/fault.c:707) 
[ 1.384579][ T0] ? kernelmode_fixup_or_oops+0x9c/0xf4 
[ 1.384579][ T0] ? __bad_area_nosemaphore+0x13f/0x260 
[ 1.384579][ T0] ? insn_get_opcode (arch/x86/lib/insn.c:299) 
[ 1.384579][ T0] ? insn_get_modrm (arch/x86/lib/insn.c:344) 
[ 1.384579][ T0] ? insn_get_sib (arch/x86/lib/insn.c:422) 
[ 1.384579][ T0] ? bad_area_nosemaphore (arch/x86/mm/fault.c:867) 
[ 1.384579][ T0] ? do_user_addr_fault (arch/x86/mm/fault.c:1476) 
[ 1.384579][ T0] ? optimize_nops (arch/x86/kernel/alternative.c:246) 
[ 1.384579][ T0] ? exc_page_fault (arch/x86/include/asm/irqflags.h:26 arch/x86/include/asm/irqflags.h:67 arch/x86/include/asm/irqflags.h:127 arch/x86/mm/fault.c:1513 arch/x86/mm/fault.c:1561) 
[ 1.384579][ T0] ? pvclock_clocksource_read_nowd (arch/x86/mm/fault.c:1518) 
[ 1.384579][ T0] ? handle_exception (arch/x86/entry/entry_32.S:1049) 
[ 1.384579][ T0] ? ___pte_free_tlb (arch/x86/include/asm/paravirt.h:92 arch/x86/mm/pgtable.c:57) 
[ 1.384579][ T0] ? pvclock_clocksource_read_nowd (arch/x86/mm/fault.c:1518) 
[ 1.384579][ T0] ? apply_alternatives (arch/x86/kernel/alternative.c:419 arch/x86/kernel/alternative.c:489) 
[ 1.384579][ T0] ? pvclock_clocksource_read_nowd (arch/x86/mm/fault.c:1518) 
[ 1.384579][ T0] ? apply_alternatives (arch/x86/kernel/alternative.c:419 arch/x86/kernel/alternative.c:489) 
[ 1.384579][ T0] ? lock_acquire (kernel/locking/lockdep.c:5670 kernel/locking/lockdep.c:5744) 
[ 1.384579][ T0] ? ___pte_free_tlb (arch/x86/include/asm/paravirt.h:92 arch/x86/mm/pgtable.c:57) 
[ 1.384579][ T0] alternative_instructions (arch/x86/kernel/alternative.c:1677) 
[ 1.384579][ T0] ? fpu__init_cpu (arch/x86/kernel/fpu/init.c:54) 
[ 1.384579][ T0] arch_cpu_finalize_init (arch/x86/kernel/cpu/common.c:2407) 
[ 1.384579][ T0] start_kernel (init/main.c:1035) 
[ 1.384579][ T0] ? set_init_arg (init/main.c:530) 
[ 1.384579][ T0] i386_start_kernel (arch/x86/kernel/head32.c:74) 
[ 1.384579][ T0] startup_32_smp (arch/x86/kernel/head_32.S:305) 
[    1.384579][    T0] Modules linked in:
[    1.384579][    T0] CR2: 0000000084864e91
[    1.384579][    T0] ---[ end trace 0000000000000000 ]---
[ 1.384579][ T0] EIP: apply_alternatives (arch/x86/kernel/alternative.c:419 arch/x86/kernel/alternative.c:489) 
[ 1.384579][ T0] Code: 3c 06 0f 85 4e 02 00 00 8b 85 ec fe ff ff 80 38 ff 0f 85 3f 02 00 00 80 78 01 15 0f 85 35 02 00 00 8b 8d ec fe ff ff 8b 41 02 <8b> 44 01 06 85 c0 74 17 89 c2 81 ea 60 18 7c c2 01 95 f3 fe ff ff
All code
========
   0:	3c 06                	cmp    $0x6,%al
   2:	0f 85 4e 02 00 00    	jne    0x256
   8:	8b 85 ec fe ff ff    	mov    -0x114(%rbp),%eax
   e:	80 38 ff             	cmpb   $0xff,(%rax)
  11:	0f 85 3f 02 00 00    	jne    0x256
  17:	80 78 01 15          	cmpb   $0x15,0x1(%rax)
  1b:	0f 85 35 02 00 00    	jne    0x256
  21:	8b 8d ec fe ff ff    	mov    -0x114(%rbp),%ecx
  27:	8b 41 02             	mov    0x2(%rcx),%eax
  2a:*	8b 44 01 06          	mov    0x6(%rcx,%rax,1),%eax		<-- trapping instruction
  2e:	85 c0                	test   %eax,%eax
  30:	74 17                	je     0x49
  32:	89 c2                	mov    %eax,%edx
  34:	81 ea 60 18 7c c2    	sub    $0xc27c1860,%edx
  3a:	01 95 f3 fe ff ff    	add    %edx,-0x10d(%rbp)

Code starting with the faulting instruction
===========================================
   0:	8b 44 01 06          	mov    0x6(%rcx,%rax,1),%eax
   4:	85 c0                	test   %eax,%eax
   6:	74 17                	je     0x1f
   8:	89 c2                	mov    %eax,%edx
   a:	81 ea 60 18 7c c2    	sub    $0xc27c1860,%edx
  10:	01 95 f3 fe ff ff    	add    %edx,-0x10d(%rbp)


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20231026/202310261032.76a10bc0-oliver.sang@intel.com


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