From: Jiri Olsa <olsajiri@gmail.com>
To: Josh Poimboeuf <jpoimboe@kernel.org>
Cc: x86@kernel.org, linux-kernel@vger.kernel.org,
live-patching@vger.kernel.org, bpf@vger.kernel.org,
Andrey Grodzovsky <andrey.grodzovsky@crowdstrike.com>,
Petr Mladek <pmladek@suse.com>, Song Liu <song@kernel.org>,
Raja Khan <raja.khan@crowdstrike.com>,
Miroslav Benes <mbenes@suse.cz>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>,
Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH v2 0/2] bpf, x86/unwind/orc: Support reliable unwinding through BPF stack frames
Date: Thu, 4 Dec 2025 15:27:35 +0100 [thread overview]
Message-ID: <aTGaVw005i8-Lb3L@krava> (raw)
In-Reply-To: <cover.1764818927.git.jpoimboe@kernel.org>
On Wed, Dec 03, 2025 at 07:32:14PM -0800, Josh Poimboeuf wrote:
> Fix livepatch stalls which may be seen when a task is blocked with BPF
> JIT on its kernel stack.
>
> Changes since v1 (https://lore.kernel.org/cover.1764699074.git.jpoimboe@kernel.org):
> - fix NULL ptr deref in __arch_prepare_bpf_trampoline()
>
> Josh Poimboeuf (2):
> bpf: Add bpf_has_frame_pointer()
> x86/unwind/orc: Support reliable unwinding through BPF stack frames
>
tried with bpftrace and it seems to go over bpf_prog properly
in this case:
bpf_prog_2beb79c650d605dd_fentry_bpf_testmod_bpf_kfunc_common_test_1+320
bpf_trampoline_354334973728+60
bpf_kfunc_common_test+9
bpf_prog_f837cdd29a0519b9_test1+25
trace_call_bpf+345
kprobe_perf_func+76
aggr_pre_handler+72
kprobe_ftrace_handler+361
drm_core_init+202
bpf_fentry_test1+9
bpf_prog_test_run_tracing+357
__sys_bpf+2263
__x64_sys_bpf+33
do_syscall_64+134
entry_SYSCALL_64_after_hwframe+118
Reviewed-by: Jiri Olsa <jolsa@kernel.org>
thanks,
jirka
next prev parent reply other threads:[~2025-12-04 14:27 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-12-04 3:32 [PATCH v2 0/2] bpf, x86/unwind/orc: Support reliable unwinding through BPF stack frames Josh Poimboeuf
2025-12-04 3:32 ` [PATCH v2 1/2] bpf: Add bpf_has_frame_pointer() Josh Poimboeuf
2025-12-04 14:04 ` Jiri Olsa
2025-12-04 17:02 ` Josh Poimboeuf
2025-12-04 3:32 ` [PATCH v2 2/2] x86/unwind/orc: Support reliable unwinding through BPF stack frames Josh Poimboeuf
2025-12-04 14:27 ` Jiri Olsa [this message]
2025-12-10 7:40 ` [PATCH v2 0/2] bpf, " patchwork-bot+netdevbpf
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