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38e0e4d04d
On Tue, Jun 28, 2022 at 04:28:58PM +0800, Pengfei Xu wrote:
> # ./ftracetest
> === Ftrace unit tests ===
> [1] Basic trace file check [PASS]
> [2] Basic test for tracers [PASS]
> [3] Basic trace clock test [PASS]
> [4] Basic event tracing check [PASS]
> [5] Change the ringbuffer size [PASS]
> [6] Snapshot and tracing setting [PASS]
> [7] trace_pipe and trace_marker [PASS]
> [8] Test ftrace direct functions against tracers [UNRESOLVED]
> [9] Test ftrace direct functions against kprobes [UNRESOLVED]
> [10] Generic dynamic event - add/remove eprobe events [FAIL]
> [11] Generic dynamic event - add/remove kprobe events
>
> It 100% reproduced in step 11 and then missing ENDBR BUG generated:
> "
> [ 9332.752836] mmiotrace: enabled CPU7.
> [ 9332.788612] mmiotrace: disabled.
> [ 9337.103426] traps: Missing ENDBR: syscall_regfunc+0x0/0xb0
It turns out that while syscall_regfunc() does have an ENDBR when
generated, it gets sealed by objtool's .ibt_endbr_seal list.
Since the only text references to this function:
$ git grep syscall_regfunc
include/linux/tracepoint.h:extern int syscall_regfunc(void);
include/trace/events/syscalls.h: syscall_regfunc, syscall_unregfunc
include/trace/events/syscalls.h: syscall_regfunc, syscall_unregfunc
kernel/tracepoint.c:int syscall_regfunc(void)
appear in the __tracepoint section which is excluded by objtool.
Fixes:
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|---|---|---|
| .. | ||
| accounting | ||
| arch | ||
| bootconfig | ||
| bpf | ||
| build | ||
| certs | ||
| cgroup | ||
| counter | ||
| debugging | ||
| edid | ||
| firewire | ||
| firmware | ||
| gpio | ||
| hv | ||
| iio | ||
| include | ||
| io_uring | ||
| kvm/kvm_stat | ||
| laptop | ||
| leds | ||
| lib | ||
| memory-model | ||
| objtool | ||
| pci | ||
| pcmcia | ||
| perf | ||
| power | ||
| rcu | ||
| scripts | ||
| spi | ||
| testing | ||
| thermal | ||
| time | ||
| tracing | ||
| usb | ||
| virtio | ||
| vm | ||
| wmi | ||
| Makefile | ||