Re: [syzbot] [net?] general protection fault in bond_header_create

[syzbot]

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 (0x8e000)
Warning: Permanently added '[localhost]:18996' (ED25519) to the list of known hosts.
[   97.289256][   T10] cfg80211: failed to load regulatory.db
[  152.340372][ T1011] ata1.00: exception Emask 0x0 SAct 0x4000 SErr 0x0 action 0x6 frozen
[  152.344761][ T1011] ata1.00: failed command: WRITE FPDMA QUEUED
[  152.347836][ T1011] ata1.00: cmd 61/70:70:b6:54:04/04:00:00:00:00/40 tag 14 ncq dma 581632 out
[  152.347836][ T1011]          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
[  152.357188][ T1011] ata1.00: status: { DRDY }
[  152.360133][ T1011] ata1: hard resetting link
[  152.682867][ T1011] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[  152.688365][ T1011] ata1.00: configured for UDMA/100
[  152.691802][ T1011] ata1: EH complete
qemu-system-x86_64: ahci: PRDT length for NCQ command (0x0) is smaller than the requested size (0x83000)
2026/03/14 02:48:08 parsed 1 programs
[  157.947149][ T5334] cgroup: Unknown subsys name 'net'
[  157.998795][ T5334] cgroup: Unknown subsys name 'cpuset'
[  158.005626][ T5334] cgroup: Unknown subsys name 'rlimit'
[  209.923844][ T1316] ieee802154 phy0 wpan0: encryption failed: -22
[  209.927618][ T1316] ieee802154 phy1 wpan1: encryption failed: -22
[  218.260125][ T1011] ata1.00: NCQ disabled due to excessive errors
[  218.263261][ T1011] ata1.00: exception Emask 0x0 SAct 0x4000 SErr 0x0 action 0x6 frozen
[  218.267800][ T1011] ata1.00: failed command: WRITE FPDMA QUEUED
[  218.271402][ T1011] ata1.00: cmd 61/18:70:1e:9d:05/04:00:00:00:00/40 tag 14 ncq dma 536576 out
[  218.271402][ T1011]          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
[  218.280859][ T1011] ata1.00: status: { DRDY }
[  218.283018][ T1011] ata1: hard resetting link
[  218.602968][ T1011] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[  218.608098][ T1011] ata1.00: configured for UDMA/100
[  218.611748][ T1011] 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-build4127251169=/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 2f7f359d8a4d
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=2f7f359d8a4db30d79a33f1bbc17a331b1eb58dd -X github.com/google/syzkaller/prog.gitRevisionDate=20260312-214211"  ./sys/syz-sysgen | grep -q false || go install -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=2f7f359d8a4db30d79a33f1bbc17a331b1eb58dd -X github.com/google/syzkaller/prog.gitRevisionDate=20260312-214211"  ./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=2f7f359d8a4db30d79a33f1bbc17a331b1eb58dd -X github.com/google/syzkaller/prog.gitRevisionDate=20260312-214211"  -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=\"2f7f359d8a4db30d79a33f1bbc17a331b1eb58dd\"
/usr/bin/ld: /tmp/ccFlVss0.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:         1c9982b4 Merge tag 'drm-fixes-2026-03-14' of https://g..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=ccef46afa67b2b19
dashboard link: https://syzkaller.appspot.com/bug?extid=3d8bc31c45e11450f24c
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=15f61d4a580000