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: Wed, 16 Sep 2026 20:58:02 -0700 [thread overview]
Message-ID: <6aab654a.71f81b7d.278072.000f.GAE@google.com> (raw)
In-Reply-To: <6aab3f26.0d1f51e9.29e58a.f7e3SMTPIN_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).
[ 97.772398][ T30] cfg80211: failed to load regulatory.db
Warning: Permanently added '10.128.1.171' (ED25519) to the list of known hosts.
2026/09/17 03:56:49 parsed 1 programs
2026/09/17 03:56:49 serving rpc on tcp://36781
[ 107.425166][ T5633] cgroup: Unknown subsys name 'net'
[ 107.545023][ T5633] cgroup: Unknown subsys name 'cpuset'
[ 107.548768][ T5633] cgroup: Unknown subsys name 'rlimit'
Setting up swapspace version 1, size = 127995904 bytes
[ 109.417916][ T5633] Adding 124996k swap on ./swap-file. Priority:0 extents:1 across:124996k
[ 112.955691][ T5646] 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.
[ 112.962789][ T5646] ebtables: xtables 32bit compat interface no longer supported in namespaces and will be removed soon.
[ 112.996505][ T5646] arp_tables: xtables 32bit compat interface no longer supported in namespaces and will be removed soon.
[ 113.265373][ T5649] ip_tables: xtables 32bit compat interface no longer supported in namespaces and will be removed soon.
[ 113.265924][ T5649] ip6_tables: xtables 32bit compat interface no longer supported in namespaces and will be removed soon.
[ 115.512391][ T5665] bridge0: port 1(bridge_slave_0) entered blocking state
[ 115.513183][ T5665] bridge0: port 1(bridge_slave_0) entered disabled state
[ 115.513330][ T5665] bridge_slave_0: entered allmulticast mode
[ 115.515484][ T5665] bridge_slave_0: entered promiscuous mode
[ 115.529061][ T5665] bridge0: port 2(bridge_slave_1) entered blocking state
[ 115.529366][ T5665] bridge0: port 2(bridge_slave_1) entered disabled state
[ 115.549236][ T5665] bridge_slave_1: entered allmulticast mode
[ 115.557769][ T5665] bridge_slave_1: entered promiscuous mode
[ 115.630326][ T5665] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[ 115.634285][ T5665] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[ 115.686289][ T5665] team0: Port device team_slave_0 added
[ 115.689012][ T5665] team0: Port device team_slave_1 added
[ 115.730273][ T5665] batman_adv: batadv0: Adding interface: batadv_slave_0
[ 115.730299][ T5665] 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.
[ 115.730326][ T5665] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[ 115.733142][ T5665] batman_adv: batadv0: Adding interface: batadv_slave_1
[ 115.733159][ T5665] 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.
[ 115.733183][ T5665] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[ 115.862291][ T5665] hsr_slave_0: entered promiscuous mode
[ 115.863274][ T5665] hsr_slave_1: entered promiscuous mode
[ 116.076825][ T5665] netdevsim netdevsim4 netdevsim0: renamed from eth0
[ 116.092514][ T5665] 8021q: adding VLAN 0 to HW filter on device netdevsim0
[ 116.093733][ T5665] netdevsim netdevsim4 netdevsim1: renamed from eth1
[ 116.098383][ T5665] 8021q: adding VLAN 0 to HW filter on device netdevsim1
[ 116.099220][ T5665] netdevsim netdevsim4 netdevsim2: renamed from eth2
[ 116.134480][ T5665] 8021q: adding VLAN 0 to HW filter on device netdevsim2
[ 116.135457][ T5665] netdevsim netdevsim4 netdevsim3: renamed from eth3
[ 116.139947][ T5665] 8021q: adding VLAN 0 to HW filter on device netdevsim3
[ 116.197762][ T5665] bridge0: port 2(bridge_slave_1) entered blocking state
[ 116.198152][ T5665] bridge0: port 2(bridge_slave_1) entered forwarding state
[ 116.199090][ T5665] bridge0: port 1(bridge_slave_0) entered blocking state
[ 116.199183][ T5665] bridge0: port 1(bridge_slave_0) entered forwarding state
[ 116.311983][ T5665] 8021q: adding VLAN 0 to HW filter on device bond0
[ 116.335679][ T35] bridge0: port 1(bridge_slave_0) entered disabled state
[ 116.336716][ T35] bridge0: port 2(bridge_slave_1) entered disabled state
[ 116.366715][ T5665] 8021q: adding VLAN 0 to HW filter on device team0
[ 116.383604][ T1025] bridge0: port 1(bridge_slave_0) entered blocking state
[ 116.383705][ T1025] bridge0: port 1(bridge_slave_0) entered forwarding state
[ 116.407438][ T35] bridge0: port 2(bridge_slave_1) entered blocking state
[ 116.407552][ T35] bridge0: port 2(bridge_slave_1) entered forwarding state
[ 116.844519][ T5665] 8021q: adding VLAN 0 to HW filter on device batadv0
[ 117.096930][ T5665] veth0_vlan: entered promiscuous mode
[ 117.113794][ T5665] veth1_vlan: entered promiscuous mode
[ 117.156179][ T5665] veth0_macvtap: entered promiscuous mode
[ 117.167677][ T5665] veth1_macvtap: entered promiscuous mode
[ 117.193491][ T5665] batman_adv: batadv0: Interface activated: batadv_slave_0
[ 117.212241][ T5665] batman_adv: batadv0: Interface activated: batadv_slave_1
[ 117.232386][ T35] netdevsim netdevsim4 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[ 117.280820][ T12] netdevsim netdevsim4 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[ 117.281325][ T12] netdevsim netdevsim4 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[ 117.281370][ T12] netdevsim netdevsim4 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[ 117.396824][ T35] netdevsim netdevsim4 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[ 117.447398][ T52] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[ 117.458211][ T52] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[ 117.468719][ T52] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[ 117.472847][ T52] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[ 117.480842][ T52] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[ 117.517254][ T35] netdevsim netdevsim4 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[ 117.859496][ T1025] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[ 117.859521][ T1025] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[ 117.918179][ T140] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[ 117.918204][ T140] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
[ 118.615243][ T35] netdevsim netdevsim4 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[ 119.627933][ T35] netdevsim netdevsim4 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
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).
[ 120.427475][ T35] bridge_slave_1: left allmulticast mode
[ 120.427525][ T35] bridge_slave_1: left promiscuous mode
[ 120.429778][ T35] bridge0: port 2(bridge_slave_1) entered disabled state
[ 120.462567][ T35] bridge_slave_0: left allmulticast mode
[ 120.462600][ T35] bridge_slave_0: left promiscuous mode
[ 120.462856][ T35] bridge0: port 1(bridge_slave_0) entered disabled state
[ 120.719836][ T35] bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
[ 120.737618][ T35] bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
[ 120.752620][ T35] bond0 (unregistering): Released all slaves
[ 120.907249][ T35] hsr_slave_0: left promiscuous mode
[ 120.914686][ T35] hsr_slave_1: left promiscuous mode
[ 120.922848][ T35] batman_adv: batadv0: Interface deactivated: batadv_slave_0
[ 120.922909][ T35] batman_adv: batadv0: Removing interface: batadv_slave_0
[ 120.940373][ T35] batman_adv: batadv0: Interface deactivated: batadv_slave_1
[ 120.940400][ T35] batman_adv: batadv0: Removing interface: batadv_slave_1
[ 120.972218][ T35] veth1_macvtap: left promiscuous mode
[ 120.972279][ T35] veth0_macvtap: left promiscuous mode
[ 120.972394][ T35] veth1_vlan: left promiscuous mode
[ 120.972483][ T35] veth0_vlan: left promiscuous mode
[ 121.426768][ T35] team0 (unregistering): Port device team_slave_1 removed
[ 121.462985][ T35] team0 (unregistering): Port device team_slave_0 removed
[ 121.649607][ T5279] 8021q: adding VLAN 0 to HW filter on device eth1
[ 122.528940][ T5279] 8021q: adding VLAN 0 to HW filter on device eth2
[ 123.247846][ T5279] 8021q: adding VLAN 0 to HW filter on device eth3
[ 123.683122][ T5279] 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-build175183130=/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/cc10CeFE.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: 238650ef Merge tag 'powerpc-7.3-4' of git://git.kernel..
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=1542b925580000
next parent reply other threads:[~2026-09-17 3:58 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <6aab3f26.0d1f51e9.29e58a.f7e3SMTPIN_ADDED_BROKEN@gmr-mx.google.com>
2026-09-17 3:58 ` syzbot [this message]
[not found] <6aab409f.393a8808.fd1d2.4646SMTPIN_ADDED_BROKEN@gmr-mx.google.com>
2026-09-17 4:29 ` [syzbot] [kvm?] INFO: task hung in kvm_gmem_release (2) syzbot
[not found] <6aa8a19d.1a29d466.b1607.109dSMTPIN_ADDED_BROKEN@gmr-mx.google.com>
2026-09-15 10:05 ` syzbot
[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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