[peterz-queue:x86/ibt] [x86/ibt] 7674335965: kernel_BUG_at_arch/x86/kernel/alternative.c

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Hello,

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

commit: 76743359658d730ecba565019069d870d30fe3b8 ("x86/ibt: Implement IBT+")
https://git.kernel.org/cgit/linux/kernel/git/peterz/queue.git x86/ibt

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)


+---------------------------------------------+------------+------------+
|                                             | 89d02f5cc0 | 7674335965 |
+---------------------------------------------+------------+------------+
| boot_successes                              | 18         | 0          |
| boot_failures                               | 0          | 18         |
| kernel_BUG_at_arch/x86/kernel/alternative.c | 0          | 18         |
| Oops:invalid_opcode:#[##]PREEMPT_SMP_PTI    | 0          | 18         |
| RIP:apply_direct_call_offset                | 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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-lkp/202409292243.b563a081-lkp@xxxxxxxxx


[    0.484790][    T0] ------------[ cut here ]------------
[    0.485675][    T0] kernel BUG at arch/x86/kernel/alternative.c:302!
[    0.486640][    T0] Oops: invalid opcode: 0000 [#1] PREEMPT SMP PTI
[    0.487072][    T0] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.11.0-09968-g76743359658d #1
[    0.487072][    T0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[ 0.487072][ T0] RIP: 0010:apply_direct_call_offset (arch/x86/kernel/alternative.c:302) 
[ 0.487072][ T0] Code: 08 43 83 44 2e 01 04 eb df 83 f8 0f 75 0f 80 7c 24 19 8f 7f 17 43 83 44 2e 02 04 eb cb 3d eb 00 00 00 74 a7 eb 06 0f 0b eb be <0f> 0b 0f b6 54 24 52 48 c7 c7 75 6a 89 82 4c 89 e6 4c 89 e1 e8 0f
All code
========
   0:	08 43 83             	or     %al,-0x7d(%rbx)
   3:	44                   	rex.R
   4:	2e 01 04 eb          	cs add %eax,(%rbx,%rbp,8)
   8:	df 83 f8 0f 75 0f    	filds  0xf750ff8(%rbx)
   e:	80 7c 24 19 8f       	cmpb   $0x8f,0x19(%rsp)
  13:	7f 17                	jg     0x2c
  15:	43 83 44 2e 02 04    	addl   $0x4,0x2(%r14,%r13,1)
  1b:	eb cb                	jmp    0xffffffffffffffe8
  1d:	3d eb 00 00 00       	cmp    $0xeb,%eax
  22:	74 a7                	je     0xffffffffffffffcb
  24:	eb 06                	jmp    0x2c
  26:	0f 0b                	ud2
  28:	eb be                	jmp    0xffffffffffffffe8
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	0f b6 54 24 52       	movzbl 0x52(%rsp),%edx
  31:	48 c7 c7 75 6a 89 82 	mov    $0xffffffff82896a75,%rdi
  38:	4c 89 e6             	mov    %r12,%rsi
  3b:	4c 89 e1             	mov    %r12,%rcx
  3e:	e8                   	.byte 0xe8
  3f:	0f                   	.byte 0xf

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	0f b6 54 24 52       	movzbl 0x52(%rsp),%edx
   7:	48 c7 c7 75 6a 89 82 	mov    $0xffffffff82896a75,%rdi
   e:	4c 89 e6             	mov    %r12,%rsi
  11:	4c 89 e1             	mov    %r12,%rcx
  14:	e8                   	.byte 0xe8
  15:	0f                   	.byte 0xf
[    0.487072][    T0] RSP: 0000:ffffffff82a03e58 EFLAGS: 00010297
[    0.487072][    T0] RAX: 0000000000000082 RBX: ffffffff8380369c RCX: 0000000000000000
[    0.487072][    T0] RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff81b4ea70
[    0.487072][    T0] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffffff82a03e58
[    0.487072][    T0] R10: 000000000000000f R11: 0000000000000040 R12: ffffffff81b4e9f0
[    0.487072][    T0] R13: fffffffffe353184 R14: ffffffff837fb86c R15: ffffffff82a03e58
[    0.487072][    T0] FS:  0000000000000000(0000) GS:ffff88842fc00000(0000) knlGS:0000000000000000
[    0.487072][    T0] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    0.487072][    T0] CR2: ffff88843ffff000 CR3: 0000000002a32000 CR4: 00000000000406f0
[    0.487072][    T0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[    0.487072][    T0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[    0.487072][    T0] Call Trace:
[    0.487072][    T0]  <TASK>
[ 0.487072][ T0] ? __die_body (arch/x86/kernel/dumpstack.c:421) 
[ 0.487072][ T0] ? die (arch/x86/kernel/dumpstack.c:? arch/x86/kernel/dumpstack.c:447) 
[ 0.487072][ T0] ? do_trap (arch/x86/kernel/traps.c:196) 
[ 0.487072][ T0] ? apply_direct_call_offset (arch/x86/kernel/alternative.c:302) 
[ 0.487072][ T0] ? do_error_trap (arch/x86/kernel/traps.c:242) 
[ 0.487072][ T0] ? apply_direct_call_offset (arch/x86/kernel/alternative.c:302) 
[ 0.487072][ T0] ? handle_invalid_op (arch/x86/kernel/traps.c:279) 
[ 0.487072][ T0] ? apply_direct_call_offset (arch/x86/kernel/alternative.c:302) 
[ 0.487072][ T0] ? exc_invalid_op (arch/x86/kernel/traps.c:361) 
[ 0.487072][ T0] ? asm_exc_invalid_op (arch/x86/include/asm/idtentry.h:621) 
[ 0.487072][ T0] ? rtl8169_netpoll (drivers/net/ethernet/realtek/r8169_main.c:4847) 
[ 0.487072][ T0] ? __pfx_rtl8169_interrupt (drivers/net/ethernet/realtek/r8169_main.c:4650) 
[ 0.487072][ T0] ? apply_direct_call_offset (arch/x86/kernel/alternative.c:302) 
[ 0.487072][ T0] ? apply_direct_call_offset (arch/x86/kernel/alternative.c:889) 
[ 0.487072][ T0] ? rtl8169_netpoll (drivers/net/ethernet/realtek/r8169_main.c:4847) 
[ 0.487072][ T0] ? rtl8169_netpoll (drivers/net/ethernet/realtek/r8169_main.c:4847) 
[ 0.487072][ T0] ? rtl8169_netpoll (drivers/net/ethernet/realtek/r8169_main.c:4847) 
[ 0.487072][ T0] alternative_instructions (arch/x86/kernel/alternative.c:1821) 
[ 0.487072][ T0] arch_cpu_finalize_init (arch/x86/kernel/cpu/common.c:2397) 
[ 0.487072][ T0] start_kernel (init/main.c:1073) 
[ 0.487072][ T0] x86_64_start_reservations (??:?) 
[ 0.487072][ T0] x86_64_start_kernel (arch/x86/kernel/head64.c:437) 
[ 0.487072][ T0] common_startup_64 (arch/x86/kernel/head_64.S:421) 
[    0.487072][    T0]  </TASK>
[    0.487072][    T0] Modules linked in:
[    0.487076][    T0] ---[ end trace 0000000000000000 ]---
[ 0.487877][ T0] RIP: 0010:apply_direct_call_offset (arch/x86/kernel/alternative.c:302) 
[ 0.491321][ T0] Code: 08 43 83 44 2e 01 04 eb df 83 f8 0f 75 0f 80 7c 24 19 8f 7f 17 43 83 44 2e 02 04 eb cb 3d eb 00 00 00 74 a7 eb 06 0f 0b eb be <0f> 0b 0f b6 54 24 52 48 c7 c7 75 6a 89 82 4c 89 e6 4c 89 e1 e8 0f
All code
========
   0:	08 43 83             	or     %al,-0x7d(%rbx)
   3:	44                   	rex.R
   4:	2e 01 04 eb          	cs add %eax,(%rbx,%rbp,8)
   8:	df 83 f8 0f 75 0f    	filds  0xf750ff8(%rbx)
   e:	80 7c 24 19 8f       	cmpb   $0x8f,0x19(%rsp)
  13:	7f 17                	jg     0x2c
  15:	43 83 44 2e 02 04    	addl   $0x4,0x2(%r14,%r13,1)
  1b:	eb cb                	jmp    0xffffffffffffffe8
  1d:	3d eb 00 00 00       	cmp    $0xeb,%eax
  22:	74 a7                	je     0xffffffffffffffcb
  24:	eb 06                	jmp    0x2c
  26:	0f 0b                	ud2
  28:	eb be                	jmp    0xffffffffffffffe8
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	0f b6 54 24 52       	movzbl 0x52(%rsp),%edx
  31:	48 c7 c7 75 6a 89 82 	mov    $0xffffffff82896a75,%rdi
  38:	4c 89 e6             	mov    %r12,%rsi
  3b:	4c 89 e1             	mov    %r12,%rcx
  3e:	e8                   	.byte 0xe8
  3f:	0f                   	.byte 0xf

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	0f b6 54 24 52       	movzbl 0x52(%rsp),%edx
   7:	48 c7 c7 75 6a 89 82 	mov    $0xffffffff82896a75,%rdi
   e:	4c 89 e6             	mov    %r12,%rsi
  11:	4c 89 e1             	mov    %r12,%rcx
  14:	e8                   	.byte 0xe8
  15:	0f                   	.byte 0xf


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20240929/202409292243.b563a081-lkp@xxxxxxxxx



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





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