From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f69.google.com (mail-oo1-f69.google.com [209.85.161.69]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E439A2D5C74 for ; Mon, 9 Mar 2026 06:17:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.69 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773037026; cv=none; b=TA/G5wtx5w2+7lwlYRaL8GAVBhm3LLLH5F2nvsQhH19wG5w10NmZhL+CXiq/J9uTTgU05vdSjFo4vk+9r9y9bOrYC88XlbFfxQgVatlL8++lYuj1RT6bQGHbBkNK/JweEPJ0Z/Scr5iggRJrsLMjB8x2LJBZN3AFtPit8g352JI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773037026; c=relaxed/simple; bh=ERgUe/+FzTOe9WmhcAD2Kl8K2CxRVSBOeldW5TuwqME=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=RRagqk2swgTECZc0SYecd/ia+/rYjVITL+Ies1X2SUb2KRvKVcS87H65mpvOFfu7IgnNdcgisUHBo0L5DoW/045POfiQoDKcCeUp6NOOJrScOi7dMCZVQnxWYPdpI9NAK8iTtazfIeZs1IjERm5dI+SWOcQ0SaK5nq5Y2PTqn08= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.161.69 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-oo1-f69.google.com with SMTP id 006d021491bc7-679c5ed0942so128517443eaf.1 for ; Sun, 08 Mar 2026 23:17:04 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1773037024; x=1773641824; h=content-transfer-encoding:to:from:subject:message-id:in-reply-to :date:mime-version:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=1BqFR7Gsjt7d2ME1+11+TLKge1wAdWjjWXBZijskabM=; b=T4cpYqTA4rOra9DFInXnTuOEs4BqVqLFtWBR2f4ePQ+9xR7LtSeKS74AvbGjKvfbYv 1VUICaHHXvR8AECjZ3PJci+PSMs7PY48IAM/RO237qmT8iOKSa8JEqSQdOznKGhvOZ2N +MFJz+iUloIcxBsU4GruyBedldlr0pe8G+tnIFaN8U9aYYRs+jTjCp1ZMgKOli2WgXt3 k4vowIefOiBy+BC1Gx4JrdLqiKjtZyI+EfGwrxPHAZWvbABK/X3mx50jJ0EQGVZi8Qzu 4u2D9o05hgXdr6+6ZIy5N0BplBpKfcFfAVOlC0mj361+mdyorZL0+rWzrJOnQFjjE9bU mmFA== X-Forwarded-Encrypted: i=1; AJvYcCWS0UByoOXOdNWh0tSwfsehTzetiEf+Dx+Ny7uT1iXRDu3amQLRnle1aLbfs255Muo9v/kiuyi3A+bdjqr2d7W/@vger.kernel.org X-Gm-Message-State: AOJu0YzmcMG6Paiw8CT+EUrl8FkHzJbQ7/A9EhH4R4XtJ/oRjJ3bMYfZ 6S6K2808ig4yhomCqwamlj5Q01EeRCLJ3cIj0tBJd2NssMYvboXNqXriOZPmb9LujAGeNHGMDyq KkALJ5sCkmwZRSmwZu+hYeJLQO0LaYUM0+S1Yw9WzuiT7eaGlpjjpmiirDNk= Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:468d:b0:67b:b8d0:a7d5 with SMTP id 006d021491bc7-67bb8d0acaamr11752eaf.53.1773037023936; Sun, 08 Mar 2026 23:17:03 -0700 (PDT) Date: Sun, 08 Mar 2026 23:17:03 -0700 In-Reply-To: <20260309055713.1938024-1-wangqing7171@gmail.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69ae65df.050a0220.310d8.0017.GAE@google.com> Subject: Re: [syzbot] [perf?] possible deadlock in refcount_dec_and_mutex_lock (2) From: syzbot To: acme@kernel.org, adrian.hunter@intel.com, alexander.shishkin@linux.intel.com, irogers@google.com, james.clark@linaro.org, jolsa@kernel.org, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, mark.rutland@arm.com, mingo@redhat.com, namhyung@kernel.org, peterz@infradead.org, syzkaller-bugs@googlegroups.com, wangqing7171@gmail.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hello, syzbot tried to test the proposed patch but the build/boot failed: failed to copy syz-executor to VM: failed to run ["scp" "-P" "41992" "-F" "= /dev/null" "-o" "UserKnownHostsFile=3D/dev/null" "-o" "IdentitiesOnly=3Dyes= " "-o" "BatchMode=3Dyes" "-o" "StrictHostKeyChecking=3Dno" "-o" "ConnectTim= eout=3D10" "/syzkaller/jobs/linux/gopath/src/github.com/google/syzkaller/bi= n/linux_amd64/syz-executor" "root@localhost:/syz-executor"]: exit status 1 syzkaller build log: go env (err=3D) AR=3D'ar' CC=3D'gcc' CGO_CFLAGS=3D'-O2 -g' CGO_CPPFLAGS=3D'' CGO_CXXFLAGS=3D'-O2 -g' CGO_ENABLED=3D'1' CGO_FFLAGS=3D'-O2 -g' CGO_LDFLAGS=3D'-O2 -g' CXX=3D'g++' GCCGO=3D'gccgo' GO111MODULE=3D'auto' GOAMD64=3D'v1' GOARCH=3D'amd64' GOAUTH=3D'netrc' GOBIN=3D'' GOCACHE=3D'/syzkaller/.cache/go-build' GOCACHEPROG=3D'' GODEBUG=3D'' GOENV=3D'/syzkaller/.config/go/env' GOEXE=3D'' GOEXPERIMENT=3D'' GOFIPS140=3D'off' GOFLAGS=3D'' GOGCCFLAGS=3D'-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=3D0= -ffile-prefix-map=3D/tmp/go-build1130506223=3D/tmp/go-build -gno-record-gc= c-switches' GOHOSTARCH=3D'amd64' GOHOSTOS=3D'linux' GOINSECURE=3D'' GOMOD=3D'/syzkaller/jobs/linux/gopath/src/github.com/google/syzkaller/go.mo= d' GOMODCACHE=3D'/syzkaller/jobs/linux/gopath/pkg/mod' GONOPROXY=3D'' GONOSUMDB=3D'' GOOS=3D'linux' GOPATH=3D'/syzkaller/jobs/linux/gopath' GOPRIVATE=3D'' GOPROXY=3D'https://proxy.golang.org,direct' GOROOT=3D'/usr/local/go' GOSUMDB=3D'sum.golang.org' GOTELEMETRY=3D'local' GOTELEMETRYDIR=3D'/syzkaller/.config/go/telemetry' GOTMPDIR=3D'' GOTOOLCHAIN=3D'auto' GOTOOLDIR=3D'/usr/local/go/pkg/tool/linux_amd64' GOVCS=3D'' GOVERSION=3D'go1.26.0' GOWORK=3D'' PKG_CONFIG=3D'pkg-config' git status (err=3D) HEAD detached at 41d8037d3362 nothing to commit, working tree clean tput: No value for $TERM and no -T specified tput: No value for $TERM and no -T specified Makefile:31: run command via tools/syz-env for best compatibility, see: Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contribut= ing.md#using-syz-env go list -f '{{.Stale}}' -ldflags=3D"-s -w -X github.com/google/syzkaller/pr= og.GitRevision=3D41d8037d336239d16aac70cd8cd917b77068d00b -X github.com/goo= gle/syzkaller/prog.gitRevisionDate=3D20260306-090128" ./sys/syz-sysgen | g= rep -q false || go install -ldflags=3D"-s -w -X github.com/google/syzkaller= /prog.GitRevision=3D41d8037d336239d16aac70cd8cd917b77068d00b -X github.com/= google/syzkaller/prog.gitRevisionDate=3D20260306-090128" ./sys/syz-sysgen make .descriptions tput: No value for $TERM and no -T specified tput: No value for $TERM and no -T specified Makefile:31: run command via tools/syz-env for best compatibility, see: Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contribut= ing.md#using-syz-env bin/syz-sysgen touch .descriptions GOOS=3Dlinux GOARCH=3Damd64 go build -ldflags=3D"-s -w -X github.com/google= /syzkaller/prog.GitRevision=3D41d8037d336239d16aac70cd8cd917b77068d00b -X g= ithub.com/google/syzkaller/prog.gitRevisionDate=3D20260306-090128" -o ./bi= n/linux_amd64/syz-execprog github.com/google/syzkaller/tools/syz-execprog mkdir -p ./bin/linux_amd64 g++ -o ./bin/linux_amd64/syz-executor executor/executor.cc \ -m64 -O2 -pthread -Wall -Werror -Wparentheses -Wunused-const-variable -Wfr= ame-larger-than=3D16384 -Wno-stringop-overflow -Wno-array-bounds -Wno-forma= t-overflow -Wno-unused-but-set-variable -Wno-unused-command-line-argument -= static-pie -std=3Dc++17 -I. -Iexecutor/_include -DGOOS_linux=3D1 -DGOARCH= _amd64=3D1 \ -DHOSTGOOS_linux=3D1 -DGIT_REVISION=3D\"41d8037d336239d16aac70cd8cd917b770= 68d00b\" /usr/bin/ld: /tmp/cc2iNFRL.o: in function `Connection::Connect(char const*,= char const*)': executor.cc:(.text._ZN10Connection7ConnectEPKcS1_[_ZN10Connection7ConnectEP= KcS1_]+0x386): warning: Using 'gethostbyname' in statically linked applicat= ions requires at runtime the shared libraries from the glibc version used f= or linking ./tools/check-syzos.sh 2>/dev/null Tested on: commit: 1f318b96 Linux 7.0-rc3 git tree: upstream kernel config: https://syzkaller.appspot.com/x/.config?x=3Dc5c49ee0942d1cd= b dashboard link: https://syzkaller.appspot.com/bug?extid=3D196a82fd904572696= b3c compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-= 1~exp1~20251221153213.50), Debian LLD 21.1.8 patch: https://syzkaller.appspot.com/x/patch.diff?x=3D130d03aa5800= 00