From: syzbot <syzbot+ab6273c58262b9de56d9@syzkaller.appspotmail.com>
To: jchuang26@m.fudan.edu.cn, linux-kernel@vger.kernel.org,
syzkaller-bugs@googlegroups.com
Subject: Re: [syzbot] [kvm?] INFO: task hung in kvm_gmem_release (2)
Date: Tue, 15 Sep 2026 03:05:03 -0700 [thread overview]
Message-ID: <6aa9184f.4c28b7d0.c1bba.0034.GAE@google.com> (raw)
In-Reply-To: <6aa8a19d.1a29d466.b1607.109dSMTPIN_ADDED_BROKEN@gmr-mx.google.com>
Hello,
syzbot tried to test the proposed patch but the build/boot failed:
SYZFAIL: failed to recv rpc
SYZFAIL: failed to recv rpc
fd=3 want=4 recv=0 n=0 (errno 9: Bad file descriptor)
execution of simple program fails: NOTFAIL: arptable checkpoint: getsockopt(ARPT_SO_GET_ENTRIES) failed. table=filter (errno 22: Invalid argument).
Warning: Permanently added '10.128.1.180' (ED25519) to the list of known hosts.
2026/09/15 10:03:47 parsed 1 programs
2026/09/15 10:03:47 serving rpc on tcp://35899
[ 92.298308][ T10] cfg80211: failed to load regulatory.db
[ 94.705243][ T5628] cgroup: Unknown subsys name 'net'
[ 94.819768][ T5628] cgroup: Unknown subsys name 'cpuset'
[ 94.823833][ T5628] cgroup: Unknown subsys name 'rlimit'
Setting up swapspace version 1, size = 127995904 bytes
[ 96.633598][ T5628] Adding 124996k swap on ./swap-file. Priority:0 extents:1 across:124996k
[ 99.775137][ T5645] soft_limit_in_bytes is deprecated and will be removed. Writing any value to this file has no effect. Please report your usecase to linux-mm@kvack.org if you depend on this functionality.
[ 99.798351][ T5645] ebtables: xtables 32bit compat interface no longer supported in namespaces and will be removed soon.
[ 99.815191][ T5645] arp_tables: xtables 32bit compat interface no longer supported in namespaces and will be removed soon.
[ 100.401545][ T1175] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[ 100.401572][ T1175] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[ 100.456794][ T50] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[ 100.456818][ T50] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
[ 101.850164][ T5670] ip_tables: xtables 32bit compat interface no longer supported in namespaces and will be removed soon.
[ 101.850560][ T5670] ip6_tables: xtables 32bit compat interface no longer supported in namespaces and will be removed soon.
[ 102.501627][ T5676] bridge0: port 1(bridge_slave_0) entered blocking state
[ 102.502376][ T5676] bridge0: port 1(bridge_slave_0) entered disabled state
[ 102.502493][ T5676] bridge_slave_0: entered allmulticast mode
[ 102.504536][ T5676] bridge_slave_0: entered promiscuous mode
[ 102.522188][ T5676] bridge0: port 2(bridge_slave_1) entered blocking state
[ 102.522347][ T5676] bridge0: port 2(bridge_slave_1) entered disabled state
[ 102.522511][ T5676] bridge_slave_1: entered allmulticast mode
[ 102.533089][ T5676] bridge_slave_1: entered promiscuous mode
[ 102.590213][ T5676] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[ 102.592992][ T5676] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[ 102.632923][ T5676] team0: Port device team_slave_0 added
[ 102.636138][ T5676] team0: Port device team_slave_1 added
[ 102.669819][ T5676] batman_adv: batadv0: Adding interface: batadv_slave_0
[ 102.669834][ T5676] batman_adv: batadv0: The MTU of interface batadv_slave_0 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1532 would solve the problem.
[ 102.669858][ T5676] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[ 102.672214][ T5676] batman_adv: batadv0: Adding interface: batadv_slave_1
[ 102.672229][ T5676] batman_adv: batadv0: The MTU of interface batadv_slave_1 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1532 would solve the problem.
[ 102.672260][ T5676] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[ 102.791250][ T5676] hsr_slave_0: entered promiscuous mode
[ 102.792721][ T5676] hsr_slave_1: entered promiscuous mode
[ 102.977390][ T5676] netdevsim netdevsim6 netdevsim0: renamed from eth0
[ 102.984696][ T5676] 8021q: adding VLAN 0 to HW filter on device netdevsim0
[ 102.996682][ T5676] netdevsim netdevsim6 netdevsim1: renamed from eth1
[ 103.011000][ T5676] 8021q: adding VLAN 0 to HW filter on device netdevsim1
[ 103.012159][ T5676] netdevsim netdevsim6 netdevsim2: renamed from eth2
[ 103.032735][ T5676] 8021q: adding VLAN 0 to HW filter on device netdevsim2
[ 103.033682][ T5676] netdevsim netdevsim6 netdevsim3: renamed from eth3
[ 103.051624][ T5676] 8021q: adding VLAN 0 to HW filter on device netdevsim3
[ 103.089001][ T5676] bridge0: port 2(bridge_slave_1) entered blocking state
[ 103.089112][ T5676] bridge0: port 2(bridge_slave_1) entered forwarding state
[ 103.089670][ T5676] bridge0: port 1(bridge_slave_0) entered blocking state
[ 103.089758][ T5676] bridge0: port 1(bridge_slave_0) entered forwarding state
[ 103.183781][ T5676] 8021q: adding VLAN 0 to HW filter on device bond0
[ 103.206356][ T1175] bridge0: port 1(bridge_slave_0) entered disabled state
[ 103.208344][ T1175] bridge0: port 2(bridge_slave_1) entered disabled state
[ 103.236601][ T5676] 8021q: adding VLAN 0 to HW filter on device team0
[ 103.245025][ T1037] bridge0: port 1(bridge_slave_0) entered blocking state
[ 103.245127][ T1037] bridge0: port 1(bridge_slave_0) entered forwarding state
[ 103.275267][ T1175] bridge0: port 2(bridge_slave_1) entered blocking state
[ 103.276466][ T1175] bridge0: port 2(bridge_slave_1) entered forwarding state
[ 103.682714][ T5676] 8021q: adding VLAN 0 to HW filter on device batadv0
[ 103.944689][ T5676] veth0_vlan: entered promiscuous mode
[ 103.963472][ T5676] veth1_vlan: entered promiscuous mode
[ 104.009708][ T5676] veth0_macvtap: entered promiscuous mode
[ 104.016196][ T5676] veth1_macvtap: entered promiscuous mode
[ 104.051538][ T5676] batman_adv: batadv0: Interface activated: batadv_slave_0
[ 104.073599][ T5676] batman_adv: batadv0: Interface activated: batadv_slave_1
[ 104.163515][ T1175] netdevsim netdevsim6 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[ 104.163925][ T1175] netdevsim netdevsim6 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[ 104.163961][ T1175] netdevsim netdevsim6 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[ 104.164004][ T1175] netdevsim netdevsim6 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[ 104.338037][ T13] netdevsim netdevsim6 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[ 104.481043][ T13] netdevsim netdevsim6 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[ 104.541977][ T13] netdevsim netdevsim6 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[ 104.620294][ T13] netdevsim netdevsim6 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[ 105.627300][ T52] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[ 105.627982][ T52] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[ 105.628534][ T52] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[ 105.629728][ T52] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[ 105.630376][ T52] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[ 105.917265][ T13] bridge_slave_1: left allmulticast mode
[ 105.917315][ T13] bridge_slave_1: left promiscuous mode
[ 105.918225][ T13] bridge0: port 2(bridge_slave_1) entered disabled state
[ 105.951678][ T13] bridge_slave_0: left allmulticast mode
[ 105.951709][ T13] bridge_slave_0: left promiscuous mode
[ 105.953700][ T13] bridge0: port 1(bridge_slave_0) entered disabled state
[ 106.194217][ T13] bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
[ 106.218127][ T13] bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
[ 106.219936][ T13] bond0 (unregistering): Released all slaves
[ 106.358701][ T13] hsr_slave_0: left promiscuous mode
[ 106.359698][ T13] hsr_slave_1: left promiscuous mode
[ 106.361694][ T13] batman_adv: batadv0: Interface deactivated: batadv_slave_0
[ 106.361805][ T13] batman_adv: batadv0: Removing interface: batadv_slave_0
[ 106.364165][ T13] batman_adv: batadv0: Interface deactivated: batadv_slave_1
[ 106.364186][ T13] batman_adv: batadv0: Removing interface: batadv_slave_1
[ 106.428453][ T13] veth1_macvtap: left promiscuous mode
[ 106.428514][ T13] veth0_macvtap: left promiscuous mode
[ 106.428623][ T13] veth1_vlan: left promiscuous mode
[ 106.428718][ T13] veth0_vlan: left promiscuous mode
[ 106.729824][ T13] team0 (unregistering): Port device team_slave_1 removed
[ 106.749999][ T13] team0 (unregistering): Port device team_slave_0 removed
[ 106.863908][ T5281] 8021q: adding VLAN 0 to HW filter on device eth1
SYZFAIL: failed to recv rpc
fd=3 want=4 recv=0 n=0 (errno 9: Bad file descriptor)
execution of simple program fails: NOTFAIL: arptable checkpoint: getsockopt(ARPT_SO_GET_ENTRIES) failed. table=filter (errno 22: Invalid argument).
[ 107.874113][ T5281] 8021q: adding VLAN 0 to HW filter on device eth2
[ 108.744031][ T5281] 8021q: adding VLAN 0 to HW filter on device eth3
[ 109.188685][ T5281] 8021q: adding VLAN 0 to HW filter on device eth4
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-build40483423=/tmp/go-build -gno-record-gcc-switches'
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMOD='/syzkaller/jobs-2/linux/gopath/src/github.com/google/syzkaller/go.mod'
GOMODCACHE='/syzkaller/jobs-2/linux/gopath/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/syzkaller/jobs-2/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 1fe56c0af80
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=1fe56c0af80df10ab9f07819d9fa709dc9971ae1 -X github.com/google/syzkaller/prog.gitRevisionDate=20260910-094642" ./sys/syz-sysgen | grep -q false || go install -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=1fe56c0af80df10ab9f07819d9fa709dc9971ae1 -X github.com/google/syzkaller/prog.gitRevisionDate=20260910-094642" ./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=1fe56c0af80df10ab9f07819d9fa709dc9971ae1 -X github.com/google/syzkaller/prog.gitRevisionDate=20260910-094642" -o ./bin/linux_amd64/syz-execprog github.com/google/syzkaller/tools/syz-execprog
mkdir -p ./bin/linux_386
x86_64-linux-gnu-g++ -o ./bin/linux_386/syz-executor executor/executor.cc \
-m32 -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_386=1 \
-DHOSTGOOS_linux=1 -DGIT_REVISION=\"1fe56c0af80df10ab9f07819d9fa709dc9971ae1\"
/usr/bin/ld: /tmp/cc3yk8t3.o: in function `Connection::Connect(char const*, char const*)':
executor.cc:(.text._ZN10Connection7ConnectEPKcS1_[_ZN10Connection7ConnectEPKcS1_]+0x145): 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
[INFO] Unsupported architecture '386', skipping check.
Tested on:
commit: 58785836 Merge tag 'nfsd-7.3-1' of git://git.kernel.or..
git tree: upstream
kernel config: https://syzkaller.appspot.com/x/.config?x=5e4e3a0e188a497e
dashboard link: https://syzkaller.appspot.com/bug?extid=ab6273c58262b9de56d9
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
userspace arch: i386
patch: https://syzkaller.appspot.com/x/patch.diff?x=155f2115580000
next parent reply other threads:[~2026-09-15 10:05 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <6aa8a19d.1a29d466.b1607.109dSMTPIN_ADDED_BROKEN@gmr-mx.google.com>
2026-09-15 10:05 ` syzbot [this message]
[not found] <6aa7d3c4.e3f7d457.2eeb0a.f494SMTPIN_ADDED_BROKEN@gmr-mx.google.com>
2026-09-14 15:16 ` syzbot
2026-09-11 15:47 syzbot
2026-09-11 23:02 ` Sean Christopherson
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