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Date: Thu, 26 Oct 2023 15:01:00 +0800
From: kernel test robot <oliver.sang@...el.com>
To: Uros Bizjak <ubizjak@...il.com>
CC: <oe-lkp@...ts.linux.dev>, <lkp@...el.com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>,
"H. Peter Anvin" <hpa@...or.com>,
Peter Zijlstra <peterz@...radead.org>,
<linux-kernel@...r.kernel.org>, <x86@...nel.org>,
<xen-devel@...ts.xenproject.org>, Uros Bizjak <ubizjak@...il.com>,
<oliver.sang@...el.com>
Subject: Re: [PATCH 1/4] x86/percpu: Use explicit segment registers in
lib/cmpxchg{8,16}b_emu.S
Hello,
kernel test robot noticed "general_protection_fault:#[##]" on:
commit: 33c7952d925e905f7af1fb7628e48e03f59885da ("[PATCH 1/4] x86/percpu: Use explicit segment registers in lib/cmpxchg{8,16}b_emu.S")
url: https://github.com/intel-lab-lkp/linux/commits/Uros-Bizjak/x86-percpu-Use-explicit-segment-registers-in-lib-cmpxchg-8-16-b_emu-S/20231017-111304
base: https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git 92fe9bb77b0c9fade150350fdb0629a662f0923f
patch link: https://lore.kernel.org/all/20231012161237.114733-2-ubizjak@gmail.com/
patch subject: [PATCH 1/4] x86/percpu: Use explicit segment registers in lib/cmpxchg{8,16}b_emu.S
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)
+------------------------------------------+------------+------------+
| | 92fe9bb77b | 33c7952d92 |
+------------------------------------------+------------+------------+
| boot_successes | 7 | 0 |
| boot_failures | 0 | 7 |
| general_protection_fault:#[##] | 0 | 7 |
| EIP:this_cpu_cmpxchg8b_emu | 0 | 7 |
| Kernel_panic-not_syncing:Fatal_exception | 0 | 7 |
+------------------------------------------+------------+------------+
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/202310261417.b269d37e-oliver.sang@intel.com
[ 0.186570][ T0] stackdepot hash table entries: 65536 (order: 6, 262144 bytes, linear)
[ 0.187499][ T0] Initializing HighMem for node 0 (0002ebfe:000bffe0)
[ 1.727965][ T0] Initializing Movable for node 0 (00000000:00000000)
[ 1.943274][ T0] Checking if this processor honours the WP bit even in supervisor mode...Ok.
[ 1.944313][ T0] Memory: 2896220K/3145208K available (16182K kernel code, 5537K rwdata, 11756K rodata, 816K init, 9720K bss, 248988K reserved, 0K cma-reserved, 2379656K highmem)
[ 1.947172][ T0] general protection fault: 0000 [#1] PREEMPT
[ 1.947900][ T0] CPU: 0 PID: 0 Comm: swapper Not tainted 6.6.0-rc1-00024-g33c7952d925e #1 8d4b014f9a0a85cc9a3f6a52ed8e88f1e431f74e
[ 1.949317][ T0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[ 1.950480][ T0] EIP: this_cpu_cmpxchg8b_emu (kbuild/src/consumer/arch/x86/lib/cmpxchg8b_emu.S:73)
[ 1.951093][ T0] Code: ff ff ff 8d b4 26 00 00 00 00 66 90 83 c6 01 3c 3d 0f 95 c0 0f b6 c0 83 c0 01 e9 56 ff ff ff bf ff ff ff ff eb a6 cc cc 9c fa <64> 3b 06 75 13 64 3b 56 04 75 0d 64 89 1e 64 89 4e 04 83 0c 24 40
All code
========
0: ff (bad)
1: ff (bad)
2: ff 8d b4 26 00 00 decl 0x26b4(%rbp)
8: 00 00 add %al,(%rax)
a: 66 90 xchg %ax,%ax
c: 83 c6 01 add $0x1,%esi
f: 3c 3d cmp $0x3d,%al
11: 0f 95 c0 setne %al
14: 0f b6 c0 movzbl %al,%eax
17: 83 c0 01 add $0x1,%eax
1a: e9 56 ff ff ff jmp 0xffffffffffffff75
1f: bf ff ff ff ff mov $0xffffffff,%edi
24: eb a6 jmp 0xffffffffffffffcc
26: cc int3
27: cc int3
28: 9c pushf
29: fa cli
2a:* 64 3b 06 cmp %fs:(%rsi),%eax <-- trapping instruction
2d: 75 13 jne 0x42
2f: 64 3b 56 04 cmp %fs:0x4(%rsi),%edx
33: 75 0d jne 0x42
35: 64 89 1e mov %ebx,%fs:(%rsi)
38: 64 89 4e 04 mov %ecx,%fs:0x4(%rsi)
3c: 83 0c 24 40 orl $0x40,(%rsp)
Code starting with the faulting instruction
===========================================
0: 64 3b 06 cmp %fs:(%rsi),%eax
3: 75 13 jne 0x18
5: 64 3b 56 04 cmp %fs:0x4(%rsi),%edx
9: 75 0d jne 0x18
b: 64 89 1e mov %ebx,%fs:(%rsi)
e: 64 89 4e 04 mov %ecx,%fs:0x4(%rsi)
12: 83 0c 24 40 orl $0x40,(%rsp)
[ 1.953397][ T0] EAX: c3c01100 EBX: c3c01180 ECX: 00000004 EDX: 00000003
[ 1.954231][ T0] ESI: e52cd090 EDI: e52cd090 EBP: c2b4bf00 ESP: c2b4bec4
[ 1.955060][ T0] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAGS: 00210082
[ 1.955949][ T0] CR0: 80050033 CR2: ffdeb000 CR3: 031b5000 CR4: 00000090
[ 1.956783][ T0] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[ 1.957641][ T0] DR6: fffe0ff0 DR7: 00000400
[ 1.958190][ T0] Call Trace:
[ 1.958554][ T0] ? show_regs (kbuild/src/consumer/arch/x86/kernel/dumpstack.c:479)
[ 1.959026][ T0] ? die_addr (kbuild/src/consumer/arch/x86/kernel/dumpstack.c:421 kbuild/src/consumer/arch/x86/kernel/dumpstack.c:460)
[ 1.959480][ T0] ? exc_general_protection (kbuild/src/consumer/arch/x86/kernel/traps.c:697 kbuild/src/consumer/arch/x86/kernel/traps.c:642)
[ 1.960101][ T0] ? exc_bounds (kbuild/src/consumer/arch/x86/kernel/traps.c:642)
[ 1.960579][ T0] ? handle_exception (kbuild/src/consumer/arch/x86/entry/entry_32.S:1049)
The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20231026/202310261417.b269d37e-oliver.sang@intel.com
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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