From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f71.google.com (mail-oo1-f71.google.com [209.85.161.71]) (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 151A929AAFA for ; Sat, 7 Mar 2026 00:55:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.71 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772844905; cv=none; b=H6bgMU8nLd+fD/FayUmHYucUJcTB6T7U95DOj6NwEtIdMXdb1CqSUW+1tj0psyImmT2H7rmY1/7vqAlF8G6uJ6AjLuZH8F7zejGkdH9v0DJIbwcWAc/KEW0jhwmheF9Y09lrW4c2OZFHVrNwSplgHRGW4Rjz5TI1Zyx8NxI0D9w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772844905; c=relaxed/simple; bh=OBs11lPQR7ABpZI7mAQ5tkhmVcAAUWJF4u2RwURe6BY=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=HX5u4oraA3iCpAKalDVt8EgenPmPUH0s+Tv/hHX19HKVL4P3P7qITCqdXta9/gfzcFqePSgsabSx0UYLscDVpx1lkGItXzgsI1aRgTtj12LJcjrwqiInjE5lRA0YpaCWhM02Kt8Mka6Fq9fJpxM0ZvKp4aruMifss+IsUcm6AkA= 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=209.85.161.71 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-f71.google.com with SMTP id 006d021491bc7-679943693c0so151760327eaf.3 for ; Fri, 06 Mar 2026 16:55:03 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1772844903; x=1773449703; 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=vD1ZPNnweiEw22vQvMFLBwvmfc9+H0Hb1c6b42ebjsc=; b=iEH4EgfLvnnXgT47twozdejF0pdFp+8w7X3rsX6ttgIcYAG6zI+RlC3JFRPVe9TFgj b84ljeD3WAc7KazaWXWp1Z6OSRH77lfm+blrbJRWxKQBwF4dufd4i1v2J5QdHadDCSuN dlmgM/9iv4atQMx05UZBv7zVhQXHn2NkDMS4oG6b1X5BOiS553pPcUa9kYOz5GEUbhYe yFO8EPpQHnZZ8n3JOWdUulHj0bKarQVM7mqG6KY0cnUr1sA2Abum+3FuhUKDYVmnUX4m TmltA8xtklhP0o64GHuUk7cKjR1/AMZZk6BVqarLfJ3L7Q5eEiUA/kkDTJ+uGHh4ooXt RGqw== X-Forwarded-Encrypted: i=1; AJvYcCUq+8Pwi/3j9B5alTOaFPNGEbbQHVDf79vZSu1MZ94WClCpLBwwLBxO6gosN8D3NJ/vpeHoG9gtMEk6JCY=@vger.kernel.org X-Gm-Message-State: AOJu0Yy+6ZJug/uQEQ9BVjoeW4mT4UJDzwxfG+Owy0I4Ceng8Y7r32Bn 1vKH9o+ObqoqUsV9UiD+oHlVmpc4MtzHTPRu0ABmoQJ9Grh2k/psfR9R+uAF8pykAR2XNvVJIvb iMM8VuG3cdeqJk8rYMd5vE7WPZZErTrVjMn0CjZ8GfRUvyhhecTUJDORlUzg= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:4c14:b0:679:a58b:bf69 with SMTP id 006d021491bc7-67b9bc67768mr2846587eaf.3.1772844903136; Fri, 06 Mar 2026 16:55:03 -0800 (PST) Date: Fri, 06 Mar 2026 16:55:03 -0800 In-Reply-To: <20260307004103.33153-1-kartikey406@gmail.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69ab7767.050a0220.13f275.0035.GAE@google.com> Subject: Re: [syzbot] [netfs?] BUG: unable to handle kernel NULL pointer dereference in netfs_unbuffered_write From: syzbot To: kartikey406@gmail.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.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: lost connection to test machine [ 53.006729][ T40] audit: type=3D1400 audit(1772844781.220:61): avc: d= enied { siginh } for pid=3D5916 comm=3D"sh" scontext=3Dsystem_u:system_r:= sshd_t tcontext=3Droot:sysadm_r:sysadm_t tclass=3Dprocess permissive=3D1 Warning: Permanently added '[localhost]:6261' (ED25519) to the list of know= n hosts. [ 59.362394][ T40] audit: type=3D1400 audit(1772844787.600:62): avc: d= enied { execute } for pid=3D5934 comm=3D"sh" name=3D"syz-execprog" dev=3D= "sda1" ino=3D2020 scontext=3Droot:sysadm_r:sysadm_t tcontext=3Droot:object_= r:etc_runtime_t tclass=3Dfile permissive=3D1 [ 59.370350][ T40] audit: type=3D1400 audit(1772844787.600:63): avc: d= enied { execute_no_trans } for pid=3D5934 comm=3D"sh" path=3D"/syz-execpr= og" dev=3D"sda1" ino=3D2020 scontext=3Droot:sysadm_r:sysadm_t tcontext=3Dro= ot:object_r:etc_runtime_t tclass=3Dfile permissive=3D1 qemu-system-x86_64: ahci: PRDT length for NCQ command (0x0) is smaller than= the requested size (0x276000) [ 60.287164][ T1115] ata1.00: Read log 0x10 page 0x00 failed, Emask 0x1 [ 60.290289][ T1115] ata1: failed to read log page 10h (errno=3D-5) [ 60.293027][ T1115] ata1.00: exception Emask 0x1 SAct 0x18000000 SErr 0x= 0 action 0x0 [ 60.296801][ T1115] ata1.00: irq_stat 0x41000000 [ 60.298945][ T1115] ata1.00: failed command: WRITE FPDMA QUEUED [ 60.301653][ T1115] ata1.00: cmd 61/b0:d8:86:ad:04/13:00:00:00:00/40 tag= 27 ncq dma 2580480 ou [ 60.301653][ T1115] res 50/00:00:00:00:00/00:00:00:00:00/00 Ema= sk 0x1 (device error) [ 60.309312][ T1115] ata1.00: status: { DRDY } [ 60.311350][ T1115] ata1.00: failed command: WRITE FPDMA QUEUED [ 60.314078][ T1115] ata1.00: cmd 61/a8:e0:36:c1:04/06:00:00:00:00/40 tag= 28 ncq dma 872448 out [ 60.314078][ T1115] res 50/00:00:00:00:00/00:00:00:00:00/00 Ema= sk 0x1 (device error) [ 60.321656][ T1115] ata1.00: status: { DRDY } [ 60.325837][ T1115] ata1.00: configured for UDMA/100 [ 60.328869][ T1115] ata1: EH complete qemu-system-x86_64: ahci: PRDT length for NCQ command (0x0) is smaller than= the requested size (0x306000) 2026/03/07 00:53:09 parsed 1 programs [ 60.882101][ T40] audit: type=3D1400 audit(1772844789.120:64): avc: d= enied { node_bind } for pid=3D5934 comm=3D"syz-execprog" saddr=3D::1 scon= text=3Droot:sysadm_r:sysadm_t tcontext=3Dsystem_u:object_r:node_t tclass=3D= tcp_socket permissive=3D1 [ 63.061673][ T40] audit: type=3D1400 audit(1772844791.300:65): avc: d= enied { mounton } for pid=3D5944 comm=3D"syz-executor" path=3D"/syzcgroup= /unified" dev=3D"sda1" ino=3D2023 scontext=3Droot:sysadm_r:sysadm_t tcontex= t=3Droot:object_r:root_t tclass=3Ddir permissive=3D1 [ 63.072219][ T40] audit: type=3D1400 audit(1772844791.310:66): avc: d= enied { mount } for pid=3D5944 comm=3D"syz-executor" name=3D"/" dev=3D"cg= roup2" ino=3D1 scontext=3Droot:sysadm_r:sysadm_t tcontext=3Dsystem_u:object= _r:cgroup_t tclass=3Dfilesystem permissive=3D1 [ 63.074421][ T5944] cgroup: Unknown subsys name 'net' [ 63.086127][ T40] audit: type=3D1400 audit(1772844791.330:67): avc: d= enied { unmount } for pid=3D5944 comm=3D"syz-executor" scontext=3Droot:sy= sadm_r:sysadm_t tcontext=3Dsystem_u:object_r:cgroup_t tclass=3Dfilesystem p= ermissive=3D1 [ 63.204323][ T5944] cgroup: Unknown subsys name 'cpuset' [ 63.211220][ T5944] cgroup: Unknown subsys name 'rlimit' [ 63.354811][ T40] audit: type=3D1400 audit(1772844791.590:68): avc: d= enied { setattr } for pid=3D5944 comm=3D"syz-executor" name=3D"raw-gadget= " dev=3D"devtmpfs" ino=3D849 scontext=3Droot:sysadm_r:sysadm_t tcontext=3Ds= ystem_u:object_r:device_t tclass=3Dchr_file permissive=3D1 [ 63.362722][ T40] audit: type=3D1400 audit(1772844791.590:69): avc: d= enied { create } for pid=3D5944 comm=3D"syz-executor" scontext=3Droot:sys= adm_r:sysadm_t tcontext=3Droot:sysadm_r:sysadm_t tclass=3Dnetlink_generic_s= ocket permissive=3D1 [ 63.371542][ T40] audit: type=3D1400 audit(1772844791.590:70): avc: d= enied { write } for pid=3D5944 comm=3D"syz-executor" scontext=3Droot:sysa= dm_r:sysadm_t tcontext=3Droot:sysadm_r:sysadm_t tclass=3Dnetlink_generic_so= cket permissive=3D1 [ 63.379823][ T40] audit: type=3D1400 audit(1772844791.590:71): avc: d= enied { read } for pid=3D5944 comm=3D"syz-executor" scontext=3Droot:sysad= m_r:sysadm_t tcontext=3Droot:sysadm_r:sysadm_t tclass=3Dnetlink_generic_soc= ket permissive=3D1 [ 76.290044][ T1418] ieee802154 phy0 wpan0: encryption failed: -22 [ 76.292902][ T1418] ieee802154 phy1 wpan1: encryption failed: -22 [ 86.527671][ T71] cfg80211: failed to load regulatory.db [ 90.406172][ T1115] ata1.00: exception Emask 0x0 SAct 0x8000000 SErr 0x0= action 0x6 frozen [ 90.408914][ T1115] ata1.00: failed command: WRITE FPDMA QUEUED [ 90.410920][ T1115] ata1.00: cmd 61/30:d8:06:29:05/18:00:00:00:00/40 tag= 27 ncq dma 3170304 ou [ 90.410920][ T1115] res 40/00:00:00:00:00/00:00:00:00:00/00 Ema= sk 0x4 (timeout) [ 90.417891][ T1115] ata1.00: status: { DRDY } [ 90.419868][ T1115] ata1: hard resetting link [ 90.740475][ T1115] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 30= 0) [ 90.744117][ T1115] ata1.00: configured for UDMA/100 [ 90.746150][ T1115] ata1: EH complete [ 90.797641][ T5947] SELinux: Context root:object_r:swapfile_t is not va= lid (left unmapped). [ 90.802207][ T40] kauditd_printk_skb: 6 callbacks suppressed [ 90.802221][ T40] audit: type=3D1400 audit(1772844819.040:78): avc: d= enied { relabelto } for pid=3D5947 comm=3D"mkswap" name=3D"swap-file" dev= =3D"sda1" ino=3D2026 scontext=3Droot:sysadm_r:sysadm_t tcontext=3Dsystem_u:= object_r:unlabeled_t tclass=3Dfile permissive=3D1 trawcon=3D"root:object_r:= swapfile_t" qemu-system-x86_64: ahci: PRDT length for NCQ command (0x0) is smaller than= the requested size (0xa6000) [ 90.886300][ T40] audit: type=3D1400 audit(1772844819.120:79): avc: d= enied { write } for pid=3D5947 comm=3D"mkswap" path=3D"/swap-file" dev=3D= "sda1" ino=3D2026 scontext=3Droot:sysadm_r:sysadm_t tcontext=3Dsystem_u:obj= ect_r:unlabeled_t tclass=3Dfile permissive=3D1 trawcon=3D"root:object_r:swa= pfile_t" [ 90.937311][ T1115] ata1.00: Read log 0x10 page 0x00 failed, Emask 0x1 [ 90.940273][ T1115] ata1: failed to read log page 10h (errno=3D-5) [ 90.943034][ T1115] ata1.00: exception Emask 0x1 SAct 0x4000 SErr 0x0 ac= tion 0x0 [ 90.946430][ T1115] ata1.00: irq_stat 0x41000008 [ 90.948570][ T1115] ata1.00: failed command: WRITE FPDMA QUEUED [ 90.951219][ T1115] ata1.00: cmd 61/30:70:46:90:05/05:00:00:00:00/40 tag= 14 ncq dma 679936 out [ 90.951219][ T1115] res 50/04:00:00:00:00/00:00:00:00:00/00 Ema= sk 0x1 (device error) [ 90.958887][ T1115] ata1.00: status: { DRDY } [ 90.960867][ T1115] ata1.00: error: { ABRT } [ 90.963944][ T1115] ata1.00: configured for UDMA/100 [ 90.966577][ T1115] ata1: EH complete qemu-system-x86_64: ahci: PRDT length for NCQ command (0x0) is smaller than= the requested size (0x400000) [ 91.007150][ T1115] ata1.00: Read log 0x10 page 0x00 failed, Emask 0x1 [ 91.010097][ T1115] ata1: failed to read log page 10h (errno=3D-5) [ 91.012787][ T1115] ata1.00: NCQ disabled due to excessive errors [ 91.015506][ T1115] ata1.00: exception Emask 0x1 SAct 0x600000 SErr 0x0 = action 0x0 [ 91.019092][ T1115] ata1.00: irq_stat 0x41000000 [ 91.020807][ T1115] ata1.00: failed command: WRITE FPDMA QUEUED [ 91.022931][ T1115] ata1.00: cmd 61/00:a8:76:95:05/20:00:00:00:00/40 tag= 21 ncq dma 4194304 ou [ 91.022931][ T1115] res 50/04:00:00:00:00/00:00:00:00:00/00 Ema= sk 0x1 (device error) [ 91.029236][ T1115] ata1.00: status: { DRDY } [ 91.030908][ T1115] ata1.00: error: { ABRT } [ 91.032434][ T1115] ata1.00: failed command: WRITE FPDMA QUEUED [ 91.034457][ T1115] ata1.00: cmd 61/30:b0:46:90:05/05:00:00:00:00/40 tag= 22 ncq dma 679936 out [ 91.034457][ T1115] res 50/04:01:00:00:00/00:00:00:00:00/00 Ema= sk 0x1 (device error) [ 91.041746][ T1115] ata1.00: status: { DRDY } [ 91.043252][ T1115] ata1.00: error: { ABRT } [ 91.045632][ T1115] ata1.00: configured for UDMA/100 [ 91.048480][ T1115] ata1: EH complete qemu-system-x86_64: hw/ide/core.c:934: ide_dma_cb: Assertion `prep_size >= =3D 0 && prep_size <=3D n * 512' failed. Connection to localhost closed by remote host. 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-build1814019681=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'go1.24.4' GOWORK=3D'' PKG_CONFIG=3D'pkg-config' git status (err=3D) HEAD detached at d20b04c80a0 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=3Dd20b04c80a01e68026299511a6ba77cc67a198f5 -X github.com/goo= gle/syzkaller/prog.gitRevisionDate=3D20260305-101922" ./sys/syz-sysgen | g= rep -q false || go install -ldflags=3D"-s -w -X github.com/google/syzkaller= /prog.GitRevision=3Dd20b04c80a01e68026299511a6ba77cc67a198f5 -X github.com/= google/syzkaller/prog.gitRevisionDate=3D20260305-101922" ./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=3Dd20b04c80a01e68026299511a6ba77cc67a198f5 -X g= ithub.com/google/syzkaller/prog.gitRevisionDate=3D20260305-101922" -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\"d20b04c80a01e68026299511a6ba77cc67= a198f5\" /usr/bin/ld: /tmp/ccZswRL1.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: 325a118c Merge tag 'pci-v7.0-fixes-3' of git://git.ker.. git tree: upstream kernel config: https://syzkaller.appspot.com/x/.config?x=3D976ba5a93c4add9= e dashboard link: https://syzkaller.appspot.com/bug?extid=3D7227db0fbac9f348d= ba0 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Deb= ian) 2.44 patch: https://syzkaller.appspot.com/x/patch.diff?x=3D16cbfb5a5800= 00