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selftests/bpf: Update DENYLIST.riscv64

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Both probe_user and stacktrace_build_id fail on riscv64 due to riscv64's
trap-based kprobe handling.

For probe_user, kprobes on riscv64 are handled via traps where the entry
path invokes irqentry_nmi_enter(). Because bpf_probe_write_user()
rejects execution in NMI context, the test fails. Upstream discussions
regarding NMI semantics on riscv are ongoing [0] and will be tracked.

For stacktrace_build_id, under the kprobe trap context with interrupts
disabled, bpf_get_stackid() obtains a valid build_id, but the queued
irq_work is deferred. As a result, subsequent bpf_get_stack() fails to
acquire mmap_read_trylock() and falls back to BPF_STACK_BUILD_ID_IP,
causing an inconsistency between the two results.

Since stacktrace_build_id is already included in the generic DENYLIST,
only add probe_user to DENYLIST.riscv64.

Signed-off-by: Pu Lehui <pulehui@huawei.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/linux-riscv/20230702025708.784106-1-guoren@kernel.org [0]
Link: https://patch.msgid.link/20260930083522.1914145-5-pulehui@huaweicloud.com
This commit is contained in:
Pu Lehui 2026-09-30 08:35:22 +00:00 committed by Alexei Starovoitov
parent 78142aa07e
commit 52e98bc77f
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tools/testing/selftests/bpf/DENYLIST.riscv64
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@ -1,2 +1,3 @@
# riscv64 deny list for BPF CI and local vmtest
exceptions # JIT does not support exceptions
probe_user # kprobe hit in trap