Message-ID: <6965c86a.050a0220.3be5c5.000e.GAE@google.com>
Date: Mon, 12 Jan 2026 20:22:02 -0800
From: syzbot <syzbot+30b78308ba7e64647ff8@...kaller.appspotmail.com>
To: anna-maria@...utronix.de, coderlogicwei@...il.com, frederic@...nel.org, 
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com, tglx@...utronix.de
Subject: Re: [syzbot] [usb?] INFO: task hung in i2c_tiny_usb_disconnect

Hello,

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

:sysadm_r:sysadm_t tcontext=system_u:object_r:nsfs_t tclass=file permissive=1
[   72.435490][   T30] audit: type=1400 audit(1768278064.403:80): avc:  denied  { open } for  pid=5828 comm="syz-executor" path="net:[4026531833]" dev="nsfs" ino=4026531833 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:nsfs_t tclass=file permissive=1
[   72.472115][   T30] audit: type=1400 audit(1768278064.423:81): avc:  denied  { mounton } for  pid=5828 comm="syz-executor" path="/" dev="sda1" ino=2 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:root_t tclass=dir permissive=1
[   72.614307][   T30] audit: type=1400 audit(1768278064.723:82): avc:  denied  { mounton } for  pid=5827 comm="syz-executor" path="/root/syzkaller.oRvwjY/syz-tmp" dev="sda1" ino=2042 scontext=root:sysadm_r:sysadm_t tcontext=root:object_r:user_home_t tclass=dir permissive=1
[   72.647781][   T30] audit: type=1400 audit(1768278064.723:83): avc:  denied  { mount } for  pid=5827 comm="syz-executor" name="/" dev="tmpfs" ino=1 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:tmpfs_t tclass=filesystem permissive=1
[   72.680449][ T5827] soft_limit_in_bytes is deprecated and will be removed. Please report your usecase to linux-mm@...ck.org if you depend on this functionality.
[   72.710613][   T30] audit: type=1400 audit(1768278064.723:84): avc:  denied  { mounton } for  pid=5827 comm="syz-executor" path="/root/syzkaller.oRvwjY/syz-tmp/newroot/dev" dev="tmpfs" ino=3 scontext=root:sysadm_r:sysadm_t tcontext=root:object_r:user_tmpfs_t tclass=dir permissive=1
[   72.747865][   T30] audit: type=1400 audit(1768278064.723:85): avc:  denied  { mount } for  pid=5827 comm="syz-executor" name="/" dev="proc" ino=1 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:proc_t tclass=filesystem permissive=1
[   72.770404][   T50] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   72.778851][   T50] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[   72.834660][   T34] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   72.843508][   T34] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
[   73.164131][ T5138] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[   73.172297][ T5138] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[   73.180246][ T5138] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[   73.196749][ T5138] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[   73.204345][ T5138] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[   74.264425][ T5845] chnl_net:caif_netlink_parms(): no params data found
[   74.807351][ T5845] bridge0: port 1(bridge_slave_0) entered blocking state
[   74.821439][ T5845] bridge0: port 1(bridge_slave_0) entered disabled state
[   74.828899][ T5845] bridge_slave_0: entered allmulticast mode
[   74.836593][ T5845] bridge_slave_0: entered promiscuous mode
[   74.864560][ T5845] bridge0: port 2(bridge_slave_1) entered blocking state
[   74.871733][ T5845] bridge0: port 2(bridge_slave_1) entered disabled state
[   74.879122][ T5845] bridge_slave_1: entered allmulticast mode
[   74.886071][ T5845] bridge_slave_1: entered promiscuous mode
[   74.955828][ T5845] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[   74.987690][ T5845] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[   75.079143][ T5845] team0: Port device team_slave_0 added
[   75.098503][ T5845] team0: Port device team_slave_1 added
[   75.204805][ T5845] batman_adv: batadv0: Adding interface: batadv_slave_0
[   75.211766][ T5845] 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.
[   75.239767][ T5845] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[   75.255335][ T5845] batman_adv: batadv0: Adding interface: batadv_slave_1
[   75.262370][ T5845] 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.
[   75.298894][ T5845] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[   75.443715][ T5845] hsr_slave_0: entered promiscuous mode
[   75.449871][ T5845] hsr_slave_1: entered promiscuous mode
[   75.592860][ T5845] netdevsim netdevsim0 netdevsim0: renamed from eth0
[   75.608307][ T5845] netdevsim netdevsim0 netdevsim1: renamed from eth1
[   75.617970][ T5845] netdevsim netdevsim0 netdevsim2: renamed from eth2
[   75.628160][ T5845] netdevsim netdevsim0 netdevsim3: renamed from eth3
[   75.708538][ T5845] 8021q: adding VLAN 0 to HW filter on device bond0
[   75.728539][ T5845] 8021q: adding VLAN 0 to HW filter on device team0
[   75.742231][   T34] bridge0: port 1(bridge_slave_0) entered blocking state
[   75.749498][   T34] bridge0: port 1(bridge_slave_0) entered forwarding state
[   75.768885][   T50] bridge0: port 2(bridge_slave_1) entered blocking state
[   75.776013][   T50] bridge0: port 2(bridge_slave_1) entered forwarding state
[   75.907923][ T5845] 8021q: adding VLAN 0 to HW filter on device batadv0
[   75.945758][ T5845] veth0_vlan: entered promiscuous mode
[   75.957083][ T5845] veth1_vlan: entered promiscuous mode
[   75.981363][ T5845] veth0_macvtap: entered promiscuous mode
[   75.990660][ T5845] veth1_macvtap: entered promiscuous mode
[   76.006870][ T5845] batman_adv: batadv0: Interface activated: batadv_slave_0
[   76.021233][ T5845] batman_adv: batadv0: Interface activated: batadv_slave_1
[   76.035693][   T50] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[   76.046111][   T50] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[   76.056220][   T50] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[   76.065691][   T50] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
2026/01/13 04:21:08 executed programs: 0
[   76.180451][   T52] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[   76.188555][   T52] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[   76.196772][   T52] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[   76.210549][   T52] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[   76.220325][   T52] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[   76.223744][   T72] netdevsim netdevsim0 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   76.302193][   T72] netdevsim netdevsim0 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   76.393644][   T72] netdevsim netdevsim0 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   76.413627][ T5926] chnl_net:caif_netlink_parms(): no params data found
[   76.438442][   T72] netdevsim netdevsim0 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   76.494052][ T5926] bridge0: port 1(bridge_slave_0) entered blocking state
[   76.501225][ T5926] bridge0: port 1(bridge_slave_0) entered disabled state
[   76.508469][ T5926] bridge_slave_0: entered allmulticast mode
[   76.515622][ T5926] bridge_slave_0: entered promiscuous mode
[   76.523432][ T5926] bridge0: port 2(bridge_slave_1) entered blocking state
[   76.530728][ T5926] bridge0: port 2(bridge_slave_1) entered disabled state
[   76.538432][ T5926] bridge_slave_1: entered allmulticast mode
[   76.546031][ T5926] bridge_slave_1: entered promiscuous mode
[   76.578006][ T5926] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[   76.589208][ T5926] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[   76.615543][ T5926] team0: Port device team_slave_0 added
[   76.622696][ T5926] team0: Port device team_slave_1 added
[   76.645027][ T5926] batman_adv: batadv0: Adding interface: batadv_slave_0
[   76.651985][ T5926] 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.
[   76.678290][ T5926] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[   76.690400][ T5926] batman_adv: batadv0: Adding interface: batadv_slave_1
[   76.697754][ T5926] 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.
[   76.726622][ T5926] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[   76.762434][ T5926] hsr_slave_0: entered promiscuous mode
[   76.768716][ T5926] hsr_slave_1: entered promiscuous mode
[   76.775549][ T5926] debugfs: 'hsr0' already exists in 'hsr'
[   76.781345][ T5926] Cannot create hsr debugfs directory
[   78.304272][ T5138] Bluetooth: hci0: command tx timeout
[   78.996240][   T72] bridge_slave_1: left allmulticast mode
[   79.002028][   T72] bridge_slave_1: left promiscuous mode
[   79.009209][   T72] bridge0: port 2(bridge_slave_1) entered disabled state
[   79.021301][   T72] bridge_slave_0: left allmulticast mode
[   79.027964][   T72] bridge_slave_0: left promiscuous mode
[   79.034032][   T72] bridge0: port 1(bridge_slave_0) entered disabled state
[   79.289281][   T72] bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
[   79.302958][   T72] bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
[   79.313901][   T72] bond0 (unregistering): Released all slaves
[   79.411479][   T72] hsr_slave_0: left promiscuous mode
[   79.418172][   T72] hsr_slave_1: left promiscuous mode
[   79.424372][   T72] batman_adv: batadv0: Interface deactivated: batadv_slave_0
[   79.431764][   T72] batman_adv: batadv0: Removing interface: batadv_slave_0
[   79.443151][   T72] batman_adv: batadv0: Interface deactivated: batadv_slave_1
[   79.450543][   T72] batman_adv: batadv0: Removing interface: batadv_slave_1
[   79.464996][   T72] veth1_macvtap: left promiscuous mode
[   79.470591][   T72] veth0_macvtap: left promiscuous mode
[   79.476732][   T72] veth1_vlan: left promiscuous mode
[   79.482025][   T72] veth0_vlan: left promiscuous mode
[   79.704321][   T72] team0 (unregistering): Port device team_slave_1 removed
[   79.727145][   T72] team0 (unregistering): Port device team_slave_0 removed
[   80.255625][ T5926] netdevsim netdevsim0 netdevsim0: renamed from eth0
[   80.269626][ T5926] netdevsim netdevsim0 netdevsim1: renamed from eth1
[   80.282305][ T5926] netdevsim netdevsim0 netdevsim2: renamed from eth2
[   80.301156][ T5926] netdevsim netdevsim0 netdevsim3: renamed from eth3
[   80.379053][ T5926] 8021q: adding VLAN 0 to HW filter on device bond0
[   80.393475][ T5138] Bluetooth: hci0: command tx timeout
[   80.396938][ T5926] 8021q: adding VLAN 0 to HW filter on device team0
[   80.418036][ T3673] bridge0: port 1(bridge_slave_0) entered blocking state
[   80.425216][ T3673] bridge0: port 1(bridge_slave_0) entered forwarding state
[   80.436608][ T3673] bridge0: port 2(bridge_slave_1) entered blocking state
[   80.443785][ T3673] bridge0: port 2(bridge_slave_1) entered forwarding state
[   80.681996][ T5926] 8021q: adding VLAN 0 to HW filter on device batadv0
[   80.742496][ T5926] veth0_vlan: entered promiscuous mode
[   80.755265][ T5926] veth1_vlan: entered promiscuous mode
[   80.789608][ T5926] veth0_macvtap: entered promiscuous mode
[   80.800489][ T5926] veth1_macvtap: entered promiscuous mode
[   80.822452][ T5926] batman_adv: batadv0: Interface activated: batadv_slave_0
[   80.838062][ T5926] batman_adv: batadv0: Interface activated: batadv_slave_1
[   80.854331][   T72] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[   80.875850][   T72] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[   80.887437][   T72] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[   80.903437][   T72] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[   80.982693][ T1093] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   81.002995][ T1093] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[   81.039017][ T3673] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   81.047802][ T3673] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
SYZFAIL: failed to recv rpc
fd=3 want=4 recv=0 n=0 (errno 9: Bad file descriptor)
[   81.437183][   T43] cfg80211: failed to load regulatory.db


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-build2779563656=/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='go1.24.4'
GOWORK=''
PKG_CONFIG='pkg-config'

git status (err=<nil>)
HEAD detached at d6526ea3e
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=d6526ea3e6ad9081c902859bbb80f9f840377cb4 -X github.com/google/syzkaller/prog.gitRevisionDate=20251126-113115"  ./sys/syz-sysgen | grep -q false || go install -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=d6526ea3e6ad9081c902859bbb80f9f840377cb4 -X github.com/google/syzkaller/prog.gitRevisionDate=20251126-113115"  ./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=d6526ea3e6ad9081c902859bbb80f9f840377cb4 -X github.com/google/syzkaller/prog.gitRevisionDate=20251126-113115"  -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=\"d6526ea3e6ad9081c902859bbb80f9f840377cb4\"
/usr/bin/ld: /tmp/cchrMEKM.o: in function `Connection::Connect(char const*, char const*)':
executor.cc:(.text._ZN10Connection7ConnectEPKcS1_[_ZN10Connection7ConnectEPKcS1_]+0x104): 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


Error text is too large and was truncated, full error text is at:
https://syzkaller.appspot.com/x/error.txt?x=15184052580000


Tested on:

commit:         b71e635f Merge tag 'cgroup-for-6.19-rc5-fixes' of git:..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=1859476832863c41
dashboard link: https://syzkaller.appspot.com/bug?extid=30b78308ba7e64647ff8
compiler:       gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=153f8052580000

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