Re: [syzbot] [rdma] general protection fault in kernel_sock_shutdown (4)

[syzbot <syzbot+d8f76778263ab65c2b21@syzkaller.appspotmail.com>]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

lost connection to test machine



syzkaller login: qemu-system-x86_64: ahci: PRDT length for NCQ command (0x0) is smaller than the requested size (0x1cc000)
Warning: Permanently added '[localhost]:12337' (ED25519) to the list of known hosts.
[   97.096781][   T10] cfg80211: failed to load regulatory.db
[  152.152171][ T1025] ata1.00: exception Emask 0x0 SAct 0x800 SErr 0x0 action 0x6 frozen
[  152.155707][ T1025] ata1.00: failed command: WRITE FPDMA QUEUED
[  152.158413][ T1025] ata1.00: cmd 61/60:58:36:81:04/0e:00:00:00:00/40 tag 11 ncq dma 1884160 ou
[  152.158413][ T1025]          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
[  152.167703][ T1025] ata1.00: status: { DRDY }
[  152.169908][ T1025] ata1: hard resetting link
[  152.494622][ T1025] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[  152.499274][ T1025] ata1.00: configured for UDMA/100
[  152.502602][ T1025] ata1: EH complete
qemu-system-x86_64: ahci: PRDT length for NCQ command (0x0) is smaller than the requested size (0xc2000)
[  152.536671][ T1025] ata1.00: Read log 0x10 page 0x00 failed, Emask 0x1
[  152.539788][ T1025] ata1: failed to read log page 10h (errno=-5)
[  152.543143][ T1025] ata1.00: NCQ disabled due to excessive errors
[  152.546416][ T1025] ata1.00: exception Emask 0x1 SAct 0xfc00 SErr 0x0 action 0x0
[  152.549623][ T1025] ata1.00: irq_stat 0x41000000
[  152.552697][ T1025] ata1.00: failed command: WRITE FPDMA QUEUED
[  152.555276][ T1025] ata1.00: cmd 61/10:50:36:01:05/0c:00:00:00:00/40 tag 10 ncq dma 1581056 ou
[  152.555276][ T1025]          res 50/00:00:00:00:00/00:00:00:00:00/00 Emask 0x1 (device error)
[  152.564262][ T1025] ata1.00: status: { DRDY }
[  152.567499][ T1025] ata1.00: failed command: WRITE FPDMA QUEUED
[  152.570300][ T1025] ata1.00: cmd 61/b0:58:46:0d:05/03:00:00:00:00/40 tag 11 ncq dma 483328 out
[  152.570300][ T1025]          res 50/00:00:00:00:00/00:00:00:00:00/00 Emask 0x1 (device error)
[  152.578750][ T1025] ata1.00: status: { DRDY }
[  152.580940][ T1025] ata1.00: failed command: WRITE FPDMA QUEUED
[  152.584242][ T1025] ata1.00: cmd 61/c8:60:f6:10:05/05:00:00:00:00/40 tag 12 ncq dma 757760 out
[  152.584242][ T1025]          res 50/00:00:00:00:00/00:00:00:00:00/00 Emask 0x1 (device error)
[  152.591624][ T1025] ata1.00: status: { DRDY }
[  152.594145][ T1025] ata1.00: failed command: WRITE FPDMA QUEUED
[  152.597218][ T1025] ata1.00: cmd 61/f0:68:be:16:05/02:00:00:00:00/40 tag 13 ncq dma 385024 out
[  152.597218][ T1025]          res 50/00:00:00:00:00/00:00:00:00:00/00 Emask 0x1 (device error)
[  152.605201][ T1025] ata1.00: status: { DRDY }
[  152.607461][ T1025] ata1.00: failed command: WRITE FPDMA QUEUED
[  152.610119][ T1025] ata1.00: cmd 61/10:70:ae:19:05/06:00:00:00:00/40 tag 14 ncq dma 794624 out
[  152.610119][ T1025]          res 50/00:00:00:00:00/00:00:00:00:00/00 Emask 0x1 (device error)
[  152.617854][ T1025] ata1.00: status: { DRDY }
[  152.620399][ T1025] ata1.00: failed command: WRITE FPDMA QUEUED
[  152.623555][ T1025] ata1.00: cmd 61/f8:78:be:1f:05/02:00:00:00:00/40 tag 15 ncq dma 389120 out
[  152.623555][ T1025]          res 50/00:00:00:00:00/00:00:00:00:00/00 Emask 0x1 (device error)
[  152.632127][ T1025] ata1.00: status: { DRDY }
[  152.635455][ T1025] ata1.00: configured for UDMA/100
[  152.638343][ T1025] ata1: EH complete
qemu-system-x86_64: hw/ide/core.c:934: ide_dma_cb: Assertion `prep_size >= 0 && prep_size <= n * 512' failed.
Connection to localhost closed by remote host.


syzkaller build log:
go env (err=<nil>)
AR='ar'
CC='gcc'
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_ENABLED='1'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
CXX='g++'
GCCGO='gccgo'
GO111MODULE='auto'
GOAMD64='v1'
GOARCH='amd64'
GOAUTH='netrc'
GOBIN=''
GOCACHE='/syzkaller/.cache/go-build'
GOCACHEPROG=''
GODEBUG=''
GOENV='/syzkaller/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFIPS140='off'
GOFLAGS=''
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build2539546880=/tmp/go-build -gno-record-gcc-switches'
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMOD='/syzkaller/jobs/linux/gopath/src/github.com/google/syzkaller/go.mod'
GOMODCACHE='/syzkaller/jobs/linux/gopath/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/syzkaller/jobs/linux/gopath'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/local/go'
GOSUMDB='sum.golang.org'
GOTELEMETRY='local'
GOTELEMETRYDIR='/syzkaller/.config/go/telemetry'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.26.0'
GOWORK=''
PKG_CONFIG='pkg-config'

git status (err=<nil>)
HEAD detached at 23ad3581d162
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/contributing.md#using-syz-env
go list -f '{{.Stale}}' -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=23ad3581d162728720256cdd0a99f8702ec9c4c5 -X github.com/google/syzkaller/prog.gitRevisionDate=20260506-081407"  ./sys/syz-sysgen | grep -q false || go install -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=23ad3581d162728720256cdd0a99f8702ec9c4c5 -X github.com/google/syzkaller/prog.gitRevisionDate=20260506-081407"  ./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/contributing.md#using-syz-env
bin/syz-sysgen
touch .descriptions
GOOS=linux GOARCH=amd64 go build -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=23ad3581d162728720256cdd0a99f8702ec9c4c5 -X github.com/google/syzkaller/prog.gitRevisionDate=20260506-081407"  -o ./bin/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 -Wframe-larger-than=16384 -Wno-stringop-overflow -Wno-array-bounds -Wno-format-overflow -Wno-unused-but-set-variable -Wno-unused-command-line-argument -static-pie -std=c++17 -I. -Iexecutor/_include   -DGOOS_linux=1 -DGOARCH_amd64=1 \
	-DHOSTGOOS_linux=1 -DGIT_REVISION=\"23ad3581d162728720256cdd0a99f8702ec9c4c5\"
go: downloading golang.org/x/sync v0.20.0
go: downloading go.opentelemetry.io/otel/sdk v1.43.0
go: downloading google.golang.org/grpc v1.80.0
go: downloading go.opentelemetry.io/otel v1.43.0
go: downloading go.opentelemetry.io/otel/trace v1.43.0
go: downloading google.golang.org/genproto/googleapis/api v0.0.0-20260401024825-9d38bb4040a9
go: downloading golang.org/x/net v0.52.0
go: downloading google.golang.org/genproto/googleapis/rpc v0.0.0-20260401024825-9d38bb4040a9
go: downloading github.com/ianlancetaylor/demangle v0.0.0-20260505044615-1ff4bf46051f
go: downloading go.opentelemetry.io/otel/sdk/metric v1.43.0
go: downloading go.opentelemetry.io/otel/metric v1.43.0
go: downloading golang.org/x/crypto v0.49.0
go: downloading golang.org/x/text v0.35.0
go: downloading github.com/go-jose/go-jose/v4 v4.1.4
/usr/bin/ld: /tmp/ccMZeaB8.o: in function `Connection::Connect(char const*, char const*)':
executor.cc:(.text._ZN10Connection7ConnectEPKcS1_[_ZN10Connection7ConnectEPKcS1_]+0x386): warning: Using 'gethostbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
./tools/check-syzos.sh 2>/dev/null



Tested on:

commit:         5862221f Merge tag 'parisc-for-7.1-rc3' of git://git.k..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=7f195f6be48c12ec
dashboard link: https://syzkaller.appspot.com/bug?extid=d8f76778263ab65c2b21
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=1583eece580000