[mhiramat:topic/fprobe-on-fgraph] [function_graph] 1c96d64aa1: WARNING:at_kernel/trace/trace.c:#run_tracer_selftest

From: kernel test robot
Date: Fri Nov 24 2023 - 21:25:19 EST



Hello,

kernel test robot noticed "WARNING:at_kernel/trace/trace.c:#run_tracer_selftest" on:

commit: 1c96d64aa1853ed6272439901bb8daa85b012d89 ("function_graph: Add a new entry handler with parent_ip and ftrace_regs")
https://git.kernel.org/cgit/linux/kernel/git/mhiramat/linux.git topic/fprobe-on-fgraph

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)


+----------------------------------------------------------------------------------+------------+------------+
| | c9e840a68b | 1c96d64aa1 |
+----------------------------------------------------------------------------------+------------+------------+
| WARNING:at_kernel/trace/trace.c:#run_tracer_selftest | 0 | 6 |
| EIP:run_tracer_selftest | 0 | 6 |
+----------------------------------------------------------------------------------+------------+------------+


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/202311241731.d1159c9f-oliver.sang@xxxxxxxxx


[ 10.938801][ T1] ------------[ cut here ]------------
[ 10.938801][ T1] WARNING: CPU: 1 PID: 1 at kernel/trace/trace.c:2030 run_tracer_selftest (kernel/trace/trace.c:2030)
[ 10.939915][ T1] Modules linked in:
[ 10.940689][ T1] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 6.6.0-rc7-00021-g1c96d64aa185 #1
[ 10.945702][ T1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[ 10.947518][ T1] EIP: run_tracer_selftest (kernel/trace/trace.c:2030)
[ 10.948530][ T1] Code: 00 00 00 00 66 90 8b 15 ac 05 1d c3 a1 e8 05 1d c3 b9 ff ff ff ff e8 07 5c ff ff e9 29 fe ff ff 68 2f 0b be c2 e8 b4 8d f5 ff <0f> 0b b8 ff ff ff ff 5a e9 a5 fe ff ff b8 f4 ff ff ff e9 9b fe ff
All code
========
0: 00 00 add %al,(%rax)
2: 00 00 add %al,(%rax)
4: 66 90 xchg %ax,%ax
6: 8b 15 ac 05 1d c3 mov -0x3ce2fa54(%rip),%edx # 0xffffffffc31d05b8
c: a1 e8 05 1d c3 b9 ff movabs 0xffffffb9c31d05e8,%eax
13: ff ff
15: ff (bad)
16: e8 07 5c ff ff call 0xffffffffffff5c22
1b: e9 29 fe ff ff jmp 0xfffffffffffffe49
20: 68 2f 0b be c2 push $0xffffffffc2be0b2f
25: e8 b4 8d f5 ff call 0xfffffffffff58dde
2a:* 0f 0b ud2 <-- trapping instruction
2c: b8 ff ff ff ff mov $0xffffffff,%eax
31: 5a pop %rdx
32: e9 a5 fe ff ff jmp 0xfffffffffffffedc
37: b8 f4 ff ff ff mov $0xfffffff4,%eax
3c: e9 .byte 0xe9
3d: 9b fwait
3e: fe (bad)
3f: ff .byte 0xff

Code starting with the faulting instruction
===========================================
0: 0f 0b ud2
2: b8 ff ff ff ff mov $0xffffffff,%eax
7: 5a pop %rdx
8: e9 a5 fe ff ff jmp 0xfffffffffffffeb2
d: b8 f4 ff ff ff mov $0xfffffff4,%eax
12: e9 .byte 0xe9
13: 9b fwait
14: fe (bad)
15: ff .byte 0xff
[ 10.950058][ T1] EAX: 00000007 EBX: c345a6a0 ECX: 00000000 EDX: 00000000
[ 10.951304][ T1] ESI: c2be3ee0 EDI: c4434400 EBP: c4d97ee4 ESP: c4d97ed4
[ 10.952559][ T1] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00010246
[ 10.953640][ T1] CR0: 80050033 CR2: 00000000 CR3: 03696000 CR4: 000406d0
[ 10.954878][ T1] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[ 10.956215][ T1] DR6: fffe0ff0 DR7: 00000400
[ 10.957111][ T1] Call Trace:
[ 10.957426][ T1] ? show_regs (arch/x86/kernel/dumpstack.c:479 arch/x86/kernel/dumpstack.c:465)
[ 10.958254][ T1] ? run_tracer_selftest (kernel/trace/trace.c:2030)
[ 10.959206][ T1] ? __warn (kernel/panic.c:673)
[ 10.960018][ T1] ? run_tracer_selftest (kernel/trace/trace.c:2030)
[ 10.960992][ T1] ? report_bug (lib/bug.c:201 lib/bug.c:219)
[ 10.961462][ T1] ? exc_overflow (arch/x86/kernel/traps.c:250)
[ 10.962321][ T1] ? handle_bug (arch/x86/kernel/traps.c:216)
[ 10.963166][ T1] ? exc_invalid_op (arch/x86/kernel/traps.c:258 (discriminator 1))
[ 10.964052][ T1] ? handle_exception (arch/x86/entry/entry_32.S:1056)
[ 10.965001][ T1] ? exc_overflow (arch/x86/kernel/traps.c:250)
[ 10.965461][ T1] ? run_tracer_selftest (kernel/trace/trace.c:2030)
[ 10.966444][ T1] ? exc_overflow (arch/x86/kernel/traps.c:250)
[ 10.967306][ T1] ? run_tracer_selftest (kernel/trace/trace.c:2030)
[ 10.968289][ T1] register_tracer (kernel/trace/trace.c:2064 kernel/trace/trace.c:2187)
[ 10.969155][ T1] ? init_graph_tracefs (kernel/trace/trace_functions_graph.c:1448)
[ 10.969155][ T1] init_graph_trace (kernel/trace/trace_functions_graph.c:1462)
[ 10.969155][ T1] do_one_initcall (init/main.c:1232)
[ 10.969155][ T1] ? parameq (include/linux/fortify-string.h:214 kernel/params.c:98)
[ 10.969155][ T1] do_initcalls (init/main.c:1293 init/main.c:1310)
[ 10.969155][ T1] ? rest_init (init/main.c:1429)
[ 10.969155][ T1] kernel_init_freeable (init/main.c:1549)
[ 10.969155][ T1] kernel_init (init/main.c:1439)
[ 10.969155][ T1] ret_from_fork (arch/x86/kernel/process.c:153)
[ 10.969155][ T1] ? rest_init (init/main.c:1429)
[ 10.973466][ T1] ret_from_fork_asm (arch/x86/entry/entry_32.S:741)
[ 10.974376][ T1] entry_INT80_32 (arch/x86/entry/entry_32.S:947)
[ 10.975233][ T1] irq event stamp: 4679531
[ 10.976101][ T1] hardirqs last enabled at (4679541): console_unlock (arch/x86/include/asm/irqflags.h:42 arch/x86/include/asm/irqflags.h:77 arch/x86/include/asm/irqflags.h:135 kernel/printk/printk.c:347 kernel/printk/printk.c:2718 kernel/printk/printk.c:3037)
[ 10.977685][ T1] hardirqs last disabled at (4679552): console_unlock (kernel/printk/printk.c:345 kernel/printk/printk.c:2718 kernel/printk/printk.c:3037)
[ 10.979295][ T1] softirqs last enabled at (4679152): __do_softirq (arch/x86/include/asm/preempt.h:27 kernel/softirq.c:400 kernel/softirq.c:582)
[ 10.980885][ T1] softirqs last disabled at (4679147): do_softirq_own_stack (arch/x86/kernel/irq_32.c:57 arch/x86/kernel/irq_32.c:147)
[ 10.981739][ T1] ---[ end trace 0000000000000000 ]---
[ 10.983191][ T1] pinctrl core: initialized pinctrl subsystem



The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20231124/202311241731.d1159c9f-oliver.sang@xxxxxxxxx



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