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[linus:master] [x86/entry] be5341eb0d: WARNING:CPU:#PID:#at_int80_emulation

To: Thomas Gleixner <tglx@xxxxxxxxxxxxx>

From: kernel test robot <oliver.sang@xxxxxxxxx>

Date: Tue, 19 Dec 2023 16:49:14 +0800

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Cc: <oe-lkp@xxxxxxxxxxxxxxx>, <lkp@xxxxxxxxx>, <linux-kernel@xxxxxxxxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxx>, "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>, <oliver.sang@xxxxxxxxx>

Delivery-date: Tue, 19 Dec 2023 08:50:03 +0000

List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

hi, Thomas Gleixner, as we understand, this commit be5341eb0d doesn't introduce new WARNING, it just converts the WARING in another type. b82a8dbd3d2f4563 be5341eb0d43b1e754799498bd2 ---------------- --------------------------- fail:runs %reproduction fail:runs | | | 9:9 -100% :9 dmesg.WARNING:CPU:#PID:#at_do_int80_syscall_32 :9 100% 9:9 dmesg.WARNING:CPU:#PID:#at_int80_emulation however, we failed to bisect dmesg.WARNING:CPU:#PID:#at_do_int80_syscall_32. at the same time, we are not sure enough if this WARNING worth to care? or it's just due to our test config (we used a randconfig in this test which could be got from below link). so we just report to you what we observed in our tests, in case it's still expose some potential problems, and maybe you could find correct owner to make some code fix. Hello, kernel test robot noticed "WARNING:CPU:#PID:#at_int80_emulation" on: commit: be5341eb0d43b1e754799498bd2e8756cc167a41 ("x86/entry: Convert INT 0x80 emulation to IDTENTRY") https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master [test failed on linux-next/master 11651f8cb2e88372d4ed523d909514dc9a613ea3] in testcase: boot compiler: clang-16 test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G (please refer to attached dmesg/kmsg for entire log/backtrace) [ 13.481107][ T48] WARNING: CPU: 0 PID: 48 at int80_emulation (arch/x86/entry/common.c:164) [ 13.481454][ T48] Modules linked in: [ 13.481655][ T48] CPU: 0 PID: 48 Comm: init Tainted: G N 6.7.0-rc4-00002-gbe5341eb0d43 #1 [ 13.482162][ T48] RIP: 0010:int80_emulation (arch/x86/entry/common.c:164) [ 13.482437][ T48] Code: 01 00 00 77 43 89 c1 48 81 f9 c9 01 00 00 48 19 c9 21 c1 48 89 df 4c 8b 1c cd 90 12 20 9a 41 ba 27 cb d4 4f 45 03 53 fc 74 02 <0f> 0b 41 ff d3 48 89 c1 48 89 4b 50 90 48 89 df 5b 41 5e 31 c0 31 All code ======== 0: 01 00 add %eax,(%rax) 2: 00 77 43 add %dh,0x43(%rdi) 5: 89 c1 mov %eax,%ecx 7: 48 81 f9 c9 01 00 00 cmp $0x1c9,%rcx e: 48 19 c9 sbb %rcx,%rcx 11: 21 c1 and %eax,%ecx 13: 48 89 df mov %rbx,%rdi 16: 4c 8b 1c cd 90 12 20 mov -0x65dfed70(,%rcx,8),%r11 1d: 9a 1e: 41 ba 27 cb d4 4f mov $0x4fd4cb27,%r10d 24: 45 03 53 fc add -0x4(%r11),%r10d 28: 74 02 je 0x2c 2a:* 0f 0b ud2 <-- trapping instruction 2c: 41 ff d3 call *%r11 2f: 48 89 c1 mov %rax,%rcx 32: 48 89 4b 50 mov %rcx,0x50(%rbx) 36: 90 nop 37: 48 89 df mov %rbx,%rdi 3a: 5b pop %rbx 3b: 41 5e pop %r14 3d: 31 c0 xor %eax,%eax 3f: 31 .byte 0x31 Code starting with the faulting instruction =========================================== 0: 0f 0b ud2 2: 41 ff d3 call *%r11 5: 48 89 c1 mov %rax,%rcx 8: 48 89 4b 50 mov %rcx,0x50(%rbx) c: 90 nop d: 48 89 df mov %rbx,%rdi 10: 5b pop %rbx 11: 41 5e pop %r14 13: 31 c0 xor %eax,%eax 15: 31 .byte 0x31 [ 13.483405][ T48] RSP: 0000:ffff9d1ffbbd7f40 EFLAGS: 00010a92 [ 13.483713][ T48] RAX: 000000000000001b RBX: ffff9d1ffbbd7f58 RCX: 000000000000001b [ 13.484112][ T48] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff9d1ffbbd7f58 [ 13.484510][ T48] RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000000002b [ 13.484910][ T48] R10: 00000000c26707b6 R11: ffffffff993719d0 R12: 0000000000000000 [ 13.485314][ T48] R13: 0000000000000000 R14: 000000000000001b R15: 0000000000000000 [ 13.485715][ T48] FS: 0000000000000000(0000) GS:ffffffff9a85c000(0063) knlGS:00000000f7fc7040 [ 13.486168][ T48] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 13.486500][ T48] CR2: 00000000f7fc2204 CR3: 000000013b76a000 CR4: 00000000000406f0 [ 13.486901][ T48] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 13.487299][ T48] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 13.487697][ T48] Call Trace: [ 13.487867][ T48] <TASK> [ 13.488018][ T48] ? __warn (kernel/panic.c:236 kernel/panic.c:677) [ 13.488229][ T48] ? int80_emulation (arch/x86/entry/common.c:164) [ 13.488474][ T48] ? report_cfi_failure (kernel/cfi.c:22) [ 13.488731][ T48] ? handle_cfi_failure (arch/x86/kernel/cfi.c:80) [ 13.488997][ T48] ? __cfi_sys_ni_posix_timers (kernel/time/posix-stubs.c:27) [ 13.489294][ T48] ? handle_bug (arch/x86/kernel/traps.c:238) [ 13.489514][ T48] ? exc_invalid_op (arch/x86/kernel/traps.c:258) [ 13.489753][ T48] ? asm_exc_invalid_op (arch/x86/include/asm/idtentry.h:568) [ 13.490017][ T48] ? __cfi_sys_ni_posix_timers (kernel/time/posix-stubs.c:27) [ 13.490306][ T48] ? int80_emulation (arch/x86/entry/common.c:164) [ 13.490552][ T48] asm_int80_emulation (arch/x86/include/asm/idtentry.h:573) [ 13.490804][ T48] RIP: 0023:0xf7ed84cd [ 13.491012][ T48] Code: eb bb 8d 76 00 83 c4 1c 5b 5e 5f 5d e9 0c f3 f6 ff e8 07 f3 f6 ff eb d4 66 90 66 90 90 89 da 8b 5c 24 04 b8 1b 00 00 00 cd 80 <89> d3 3d 01 f0 ff ff 0f 83 e6 f2 f6 ff c3 66 90 66 90 90 55 e8 4a All code ======== 0: eb bb jmp 0xffffffffffffffbd 2: 8d 76 00 lea 0x0(%rsi),%esi 5: 83 c4 1c add $0x1c,%esp 8: 5b pop %rbx 9: 5e pop %rsi a: 5f pop %rdi b: 5d pop %rbp c: e9 0c f3 f6 ff jmp 0xfffffffffff6f31d 11: e8 07 f3 f6 ff call 0xfffffffffff6f31d 16: eb d4 jmp 0xffffffffffffffec 18: 66 90 xchg %ax,%ax 1a: 66 90 xchg %ax,%ax 1c: 90 nop 1d: 89 da mov %ebx,%edx 1f: 8b 5c 24 04 mov 0x4(%rsp),%ebx 23: b8 1b 00 00 00 mov $0x1b,%eax 28: cd 80 int $0x80 2a:* 89 d3 mov %edx,%ebx <-- trapping instruction 2c: 3d 01 f0 ff ff cmp $0xfffff001,%eax 31: 0f 83 e6 f2 f6 ff jae 0xfffffffffff6f31d 37: c3 ret 38: 66 90 xchg %ax,%ax 3a: 66 90 xchg %ax,%ax 3c: 90 nop 3d: 55 push %rbp 3e: e8 .byte 0xe8 3f: 4a rex.WX Code starting with the faulting instruction =========================================== 0: 89 d3 mov %edx,%ebx 2: 3d 01 f0 ff ff cmp $0xfffff001,%eax 7: 0f 83 e6 f2 f6 ff jae 0xfffffffffff6f2f3 d: c3 ret e: 66 90 xchg %ax,%ax 10: 66 90 xchg %ax,%ax 12: 90 nop 13: 55 push %rbp 14: e8 .byte 0xe8 15: 4a rex.WX [ 13.491980][ T48] RSP: 002b:00000000fff098ac EFLAGS: 00000286 ORIG_RAX: 000000000000001b [ 13.492402][ T48] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000fff09ad4 [ 13.492800][ T48] RDX: 00000000f7fc1e64 RSI: 00000000fff09b60 RDI: 00000000fff09d4c [ 13.493204][ T48] RBP: 00000000fff09ad4 R08: 0000000000000000 R09: 0000000000000000 [ 13.493607][ T48] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 13.494011][ T48] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 13.494418][ T48] </TASK> [ 13.494576][ T48] irq event stamp: 1181 [ 13.494786][ T48] hardirqs last enabled at (1191): console_unlock (arch/x86/include/asm/irqflags.h:19 arch/x86/include/asm/irqflags.h:67 arch/x86/include/asm/irqflags.h:127 kernel/printk/printk.c:341 kernel/printk/printk.c:2706 kernel/printk/printk.c:3038) [ 13.495252][ T48] hardirqs last disabled at (1200): console_unlock (kernel/printk/printk.c:339) [ 13.495715][ T48] softirqs last enabled at (808): __irq_exit_rcu (include/linux/sched.h:2463 kernel/softirq.c:615 kernel/softirq.c:634) [ 13.496172][ T48] softirqs last disabled at (797): __irq_exit_rcu (include/linux/sched.h:2463 kernel/softirq.c:615 kernel/softirq.c:634) [ 13.496626][ T48] ---[ end trace 0000000000000000 ]--- [ 13.496901][ T48] process 48 (init) attempted a POSIX timer syscall while CONFIG_POSIX_TIMERS is not set [ 13.517868][ T48] CFI failure at int80_emulation+0x67/0xb0 (target: sys_ni_posix_timers+0x0/0x70; expected type: 0xb02b34d9 The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20231219/202312191507.348721d2-oliver.sang@xxxxxxxxx -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki

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