Sanitizer flags an eBPF bug

Sanitizer flags an eBPF bug

[syeda-mahnur.asif]

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Hi,

I've been playing around with eBPF and have sanitizers enabled, a "BUG: 
Invalid wait context" is thrown in some specific instances:
1. The eBPF program is of Tracing type
2. Ringbuf helper functions are used.
3. The program is attached to perf_event related symbols in the kernel.

I'm attaching a folder with two instances of such programs and the info 
dumped by the sanitizer. The attached files for each instance include:
1. bpf_prog(x).c
2. bpf_prog(x).o - object file that is compiled with "clang-16 -O2 -g 
-target bpf -c bpf_progx.c -o bpf_progx.o" and loaded by libbpf (v1.6)
3. trig(x).c - File in C that is compiled as a binary and when executed 
causes the bpf program to run
4. dump(x).txt - Sanitizer dump
5. vmlinux.h - Specific vmlinux file used in compiling the ebpf program 
object files

Happy to provide any other additional info that might be relevant.

Best regards,
Mahnur

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Re: Sanitizer flags an eBPF bug

[syeda-mahnur.asif]

Hi,

Just wondering if there is any update on this?

Best regards,
Mahnur

On 2025-11-03 15:02, syeda-mahnur.asif wrote:
> Hi,
> 
> I've been playing around with eBPF and have sanitizers enabled, a "BUG: 
> Invalid wait context" is thrown in some specific instances:
> 1. The eBPF program is of Tracing type
> 2. Ringbuf helper functions are used.
> 3. The program is attached to perf_event related symbols in the kernel.
> 
> I'm attaching a folder with two instances of such programs and the info 
> dumped by the sanitizer. The attached files for each instance include:
> 1. bpf_prog(x).c
> 2. bpf_prog(x).o - object file that is compiled with "clang-16 -O2 -g 
> -target bpf -c bpf_progx.c -o bpf_progx.o" and loaded by libbpf (v1.6)
> 3. trig(x).c - File in C that is compiled as a binary and when executed 
> causes the bpf program to run
> 4. dump(x).txt - Sanitizer dump
> 5. vmlinux.h - Specific vmlinux file used in compiling the ebpf program 
> object files
> 
> Happy to provide any other additional info that might be relevant.
> 
> Best regards,
> Mahnur

Re: Sanitizer flags an eBPF bug

[syeda-mahnur.asif]

Hi,

I would like to disclose this at a conference in a few weeks, and it 
would be great if there is any confirmation / update on this?

Best regards,
Mahnur

On 2025-11-27 14:59, syeda-mahnur.asif wrote:
> Hi,
> 
> Just wondering if there is any update on this?
> 
> Best regards,
> Mahnur
> 
> On 2025-11-03 15:02, syeda-mahnur.asif wrote:
>> Hi,
>> 
>> I've been playing around with eBPF and have sanitizers enabled, a 
>> "BUG: Invalid wait context" is thrown in some specific instances:
>> 1. The eBPF program is of Tracing type
>> 2. Ringbuf helper functions are used.
>> 3. The program is attached to perf_event related symbols in the 
>> kernel.
>> 
>> I'm attaching a folder with two instances of such programs and the 
>> info dumped by the sanitizer. The attached files for each instance 
>> include:
>> 1. bpf_prog(x).c
>> 2. bpf_prog(x).o - object file that is compiled with "clang-16 -O2 -g 
>> -target bpf -c bpf_progx.c -o bpf_progx.o" and loaded by libbpf (v1.6)
>> 3. trig(x).c - File in C that is compiled as a binary and when 
>> executed causes the bpf program to run
>> 4. dump(x).txt - Sanitizer dump
>> 5. vmlinux.h - Specific vmlinux file used in compiling the ebpf 
>> program object files
>> 
>> Happy to provide any other additional info that might be relevant.
>> 
>> Best regards,
>> Mahnur