linux-kernel - selftests: kvm: irqfd_test: KVM_IRQFD failed, rc: -1 errno: 11 (Resource temporarily unavailable)

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Message-ID: <CA+G9fYuUcs_-SKWSbiAgyzuhE9-oqSAGDQOU6pTPfwq57+cWSw@mail.gmail.com>
Date: Tue, 30 Sep 2025 16:29:54 +0530
From: Naresh Kamboju <naresh.kamboju@...aro.org>
To: "open list:KERNEL SELFTEST FRAMEWORK" <linux-kselftest@...r.kernel.org>, kvmarm@...ts.linux.dev, 
	open list <linux-kernel@...r.kernel.org>, lkft-triage@...ts.linaro.org, 
	Linux Regressions <regressions@...ts.linux.dev>
Cc: kvm list <kvm@...r.kernel.org>, Sean Christopherson <seanjc@...gle.com>, 
	Paolo Bonzini <pbonzini@...hat.com>, K Prateek Nayak <kprateek.nayak@....com>, 
	Arnd Bergmann <arnd@...db.de>, Dan Carpenter <dan.carpenter@...aro.org>, 
	Anders Roxell <anders.roxell@...aro.org>, Ben Copeland <benjamin.copeland@...aro.org>
Subject: selftests: kvm: irqfd_test: KVM_IRQFD failed, rc: -1 errno: 11
 (Resource temporarily unavailable)

The selftests: kvm: irqfd_test consistently fails across all test platforms
since its introduction in Linux next-20250625. The failure occurs due to
a KVM_IRQFD ioctl returning errno 11 (Resource temporarily unavailable).
This has been observed from day one and is reproducible on all test runs.

Reproducibility: 100% failure on all test platforms since
next-20250625..next-20250929

Test fails on the below list
 * graviton4
 * rk3399-rock-pi-4b

## Initial Observations:
The test is attempting to register an IRQFD but fails with EAGAIN (errno 11).
This likely indicates resource exhaustion or unsupported behavior on
affected ARM-based platforms.

Could you please advise on the way forward for this test?
Should we treat this as an unsupported case on ARM platforms,
or is there a missing implementation/configuration that needs to be addressed?

## Test log
selftests: kvm: irqfd_test
Random seed: 0x6b8b4567
==== Test Assertion Failure ====
  include/kvm_util.h:527: !ret
  pid=721 tid=721 errno=11 - Resource temporarily unavailable
     1 0x000000000040250f: kvm_irqfd at kvm_util.h:527
     2 0x000000000040222f: main at irqfd_test.c:100
     3 0x0000ffffbd43229b: ?? ??:0
     4 0x0000ffffbd43237b: ?? ??:0
addr2line:      5 0x000000000040206f: DWARF error: mangled line number
section (bad file number)
addr2line: DWARF error: mangled line number section (bad file number)
_start at ??:?
  KVM_IRQFD failed, rc: -1 errno: 11 (Resource temporarily unavailable)
not ok 4 selftests: kvm: irqfd_test exit=254

## Links
   * https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20250929/testrun/30048394/suite/kselftest-kvm/test/kvm_irqfd_test/log
   * https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20250929/testrun/30048394/suite/kselftest-kvm/test/kvm_irqfd_test/details/