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
