Re: [syzbot] [kernel?] INFO: task hung in restrict_one_thread_callback

[syzbot]

Hello,

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

batadv0: Interface activated: batadv_slave_0
[   74.866770][ T5874] batman_adv: batadv0: Interface activated: batadv_slave_1
[   74.884996][   T58] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[   74.894310][   T58] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[   74.905283][   T58] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[   74.914746][   T58] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[   75.043478][   T58] netdevsim netdevsim0 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   75.127104][   T58] netdevsim netdevsim0 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   75.185369][   T58] netdevsim netdevsim0 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   75.334360][   T58] netdevsim netdevsim0 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[   75.469719][   T49] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   75.490337][   T49] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[   75.518222][   T49] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[   75.526524][   T49] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
2026/02/24 03:03:58 executed programs: 0
[   76.930172][   T51] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[   76.938217][   T51] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[   76.948739][   T51] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[   76.957301][   T51] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[   76.965874][   T51] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[   77.092846][ T5933] chnl_net:caif_netlink_parms(): no params data found
[   77.162916][ T5933] bridge0: port 1(bridge_slave_0) entered blocking state
[   77.170555][ T5933] bridge0: port 1(bridge_slave_0) entered disabled state
[   77.178400][ T5933] bridge_slave_0: entered allmulticast mode
[   77.187301][ T5933] bridge_slave_0: entered promiscuous mode
[   77.195638][ T5933] bridge0: port 2(bridge_slave_1) entered blocking state
[   77.202901][ T5933] bridge0: port 2(bridge_slave_1) entered disabled state
[   77.210072][ T5933] bridge_slave_1: entered allmulticast mode
[   77.217641][ T5933] bridge_slave_1: entered promiscuous mode
[   77.246869][ T5933] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[   77.259177][ T5933] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[   77.296961][ T5933] team0: Port device team_slave_0 added
[   77.305577][ T5933] team0: Port device team_slave_1 added
[   77.330912][ T5933] batman_adv: batadv0: Adding interface: batadv_slave_0
[   77.337915][ T5933] 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.
[   77.363986][ T5933] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[   77.376893][ T5933] batman_adv: batadv0: Adding interface: batadv_slave_1
[   77.383931][ T5933] 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.
[   77.409943][ T5933] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[   77.455317][ T5933] hsr_slave_0: entered promiscuous mode
[   77.463048][ T5933] hsr_slave_1: entered promiscuous mode
[   77.469984][ T5933] debugfs: 'hsr0' already exists in 'hsr'
[   77.475853][ T5933] Cannot create hsr debugfs directory
[   77.989478][   T58] bridge_slave_1: left allmulticast mode
[   77.997034][   T58] bridge_slave_1: left promiscuous mode
[   78.003996][   T58] bridge0: port 2(bridge_slave_1) entered disabled state
[   78.014607][   T58] bridge_slave_0: left allmulticast mode
[   78.020289][   T58] bridge_slave_0: left promiscuous mode
[   78.027158][   T58] bridge0: port 1(bridge_slave_0) entered disabled state
[   78.170497][   T58] bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
[   78.181273][   T58] bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
[   78.191450][   T58] bond0 (unregistering): Released all slaves
[   78.312349][   T58] hsr_slave_0: left promiscuous mode
[   78.318549][   T58] hsr_slave_1: left promiscuous mode
[   78.327463][   T58] batman_adv: batadv0: Interface deactivated: batadv_slave_0
[   78.335002][   T58] batman_adv: batadv0: Removing interface: batadv_slave_0
[   78.348743][   T58] batman_adv: batadv0: Interface deactivated: batadv_slave_1
[   78.357270][   T58] batman_adv: batadv0: Removing interface: batadv_slave_1
[   78.372232][   T58] veth1_macvtap: left promiscuous mode
[   78.377993][   T58] veth0_macvtap: left promiscuous mode
[   78.384521][   T58] veth1_vlan: left promiscuous mode
[   78.390232][   T58] veth0_vlan: left promiscuous mode
[   78.679788][   T58] team0 (unregistering): Port device team_slave_1 removed
[   78.694967][   T58] team0 (unregistering): Port device team_slave_0 removed
[   78.820049][    C0] list_del corruption, ffff88806e888490->next is NULL
[   78.827266][    C0] ------------[ cut here ]------------
[   78.832719][    C0] kernel BUG at lib/list_debug.c:53!
[   78.838048][    C0] Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
[   78.844303][    C0] CPU: 0 UID: 0 PID: 5487 Comm: dhcpcd Not tainted syzkaller #0 PREEMPT(full) 
[   78.853223][    C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
[   78.863256][    C0] RIP: 0010:__list_del_entry_valid_or_report+0xdf/0x190
[   78.870177][    C0] Code: 49 39 1f 0f 85 9e 00 00 00 b0 01 5b 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc cc 48 c7 c7 40 c1 29 8c 48 89 de e8 c2 29 65 fc 90 <0f> 0b 48 c7 c7 a0 c1 29 8c 48 89 de e8 b0 29 65 fc 90 0f 0b 4c 89
[   78.889849][    C0] RSP: 0018:ffffc90000007d58 EFLAGS: 00010046
[   78.895995][    C0] RAX: 0000000000000033 RBX: ffff88806e888490 RCX: f63d3b529a1a7600
[   78.903953][    C0] RDX: 0000000000000100 RSI: 0000000080000102 RDI: 0000000000000000
[   78.911915][    C0] RBP: 0000000000000203 R08: ffffc90000007ae7 R09: 1ffff92000000f5c
[   78.919872][    C0] R10: dffffc0000000000 R11: fffff52000000f5d R12: 1ffff1100dd11092
[   78.927827][    C0] R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000
[   78.935780][    C0] FS:  00007f45c61e0740(0000) GS:ffff888125009000(0000) knlGS:0000000000000000
[   78.944695][    C0] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   78.951264][    C0] CR2: 0000561094e94138 CR3: 000000003472a000 CR4: 00000000003526f0
[   78.959224][    C0] Call Trace:
[   78.962488][    C0]  <IRQ>
[   78.965324][    C0]  dst_destroy+0x202/0x5a0
[   78.969728][    C0]  ? _raw_spin_unlock_irqrestore+0x30/0x80
[   78.975693][    C0]  ? rcu_core+0x751/0x1070
[   78.980104][    C0]  ? __pfx_dst_destroy_rcu+0x10/0x10
[   78.985381][    C0]  rcu_core+0x7cd/0x1070
[   78.989615][    C0]  ? __pfx_rcu_core+0x10/0x10
[   78.994277][    C0]  ? _raw_spin_unlock_irqrestore+0x4c/0x80
[   79.000075][    C0]  handle_softirqs+0x22a/0x870
[   79.004841][    C0]  ? do_softirq+0x76/0xd0
[   79.009165][    C0]  ? inet6_fill_ifla6_attrs+0x1150/0x25e0
[   79.014877][    C0]  do_softirq+0x76/0xd0
[   79.019025][    C0]  </IRQ>
[   79.021949][    C0]  <TASK>
[   79.024871][    C0]  __local_bh_enable_ip+0xf8/0x130
[   79.029987][    C0]  inet6_fill_ifla6_attrs+0x1150/0x25e0
[   79.035523][    C0]  ? __pfx_inet6_fill_ifla6_attrs+0x10/0x10
[   79.041400][    C0]  ? nla_put+0xd0/0x150
[   79.045548][    C0]  inet6_fill_link_af+0x9b/0x120
[   79.050473][    C0]  rtnl_fill_link_af+0x1c8/0x440
[   79.055405][    C0]  rtnl_fill_ifinfo+0x1e08/0x20f0
[   79.060421][    C0]  ? __pfx_rtnl_fill_ifinfo+0x10/0x10
[   79.065866][    C0]  ? __asan_memset+0x22/0x50
[   79.070449][    C0]  ? __nla_validate_parse+0x2480/0x2dc0
[   79.076021][    C0]  ? update_load_avg+0x1b0/0x1ec0
[   79.081042][    C0]  ? __lock_acquire+0x6b5/0x2cf0
[   79.085985][    C0]  ? xas_load+0x593/0x5b0
[   79.090308][    C0]  ? xa_find+0x25b/0x2b0
[   79.094537][    C0]  ? xa_find+0x8c/0x2b0
[   79.098679][    C0]  rtnl_dump_ifinfo+0xbb1/0x1180
[   79.103609][    C0]  ? __pfx_rtnl_dump_ifinfo+0x10/0x10
[   79.109062][    C0]  ? __lock_acquire+0x6b5/0x2cf0
[   79.114005][    C0]  ? trace_kmalloc+0x2a/0x110
[   79.118667][    C0]  ? __kmalloc_node_track_caller_noprof+0x4f9/0x7b0
[   79.125243][    C0]  ? __pfx_rtnl_dump_ifinfo+0x10/0x10
[   79.130598][    C0]  rtnl_dumpit+0xa2/0x200
[   79.134926][    C0]  netlink_dump+0x722/0xe80
[   79.139430][    C0]  ? __pfx_netlink_dump+0x10/0x10
[   79.144446][    C0]  ? __netlink_lookup+0x7e4/0x8b0
[   79.149544][    C0]  ? netlink_lookup+0x30/0x200
[   79.154297][    C0]  ? netlink_lookup+0x30/0x200
[   79.159049][    C0]  ? netlink_lookup+0x30/0x200
[   79.163803][    C0]  __netlink_dump_start+0x5cb/0x7e0
[   79.168994][    C0]  rtnetlink_rcv_msg+0xa3a/0xbe0
[   79.173914][    C0]  ? __pfx_rtnl_dump_ifinfo+0x10/0x10
[   79.179273][    C0]  ? rtnetlink_rcv_msg+0x1b9/0xbe0
[   79.184367][    C0]  ? __pfx_rtnetlink_rcv_msg+0x10/0x10
[   79.189808][    C0]  ? __pfx_rtnl_dumpit+0x10/0x10
[   79.194727][    C0]  ? __pfx_rtnl_dump_ifinfo+0x10/0x10
[   79.200098][    C0]  netlink_rcv_skb+0x232/0x4b0
[   79.204854][    C0]  ? __pfx_rtnetlink_rcv_msg+0x10/0x10
[   79.210320][    C0]  ? __pfx_netlink_rcv_skb+0x10/0x10
[   79.215638][    C0]  ? netlink_deliver_tap+0x2e/0x1b0
[   79.220896][    C0]  netlink_unicast+0x80f/0x9b0
[   79.225675][    C0]  ? __pfx_netlink_unicast+0x10/0x10
[   79.230970][    C0]  ? netlink_sendmsg+0x650/0xb40
[   79.235916][    C0]  ? skb_put+0x11b/0x210
[   79.240161][    C0]  netlink_sendmsg+0x813/0xb40
[   79.244919][    C0]  ? __pfx_netlink_sendmsg+0x10/0x10
[   79.250190][    C0]  ? tomoyo_socket_sendmsg_permission+0x1e0/0x300
[   79.256599][    C0]  ? __pfx_netlink_sendmsg+0x10/0x10
[   79.261870][    C0]  sock_sendmsg_nosec+0x18f/0x1d0
[   79.266890][    C0]  __sys_sendto+0x3ff/0x590
[   79.271378][    C0]  ? __pfx___sys_sendto+0x10/0x10
[   79.276392][    C0]  ? rcu_is_watching+0x15/0xb0
[   79.281149][    C0]  __x64_sys_sendto+0xde/0x100
[   79.285900][    C0]  do_syscall_64+0x14d/0xf80
[   79.290478][    C0]  ? trace_irq_disable+0x3b/0x150
[   79.295493][    C0]  ? entry_SYSCALL_64_after_hwframe+0x77/0x7f
[   79.301544][    C0]  ? clear_bhb_loop+0x40/0x90
[   79.306206][    C0]  entry_SYSCALL_64_after_hwframe+0x77/0x7f
[   79.312116][    C0] RIP: 0033:0x7f45c626a407
[   79.316533][    C0] Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
[   79.336123][    C0] RSP: 002b:00007fff5ef7c930 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[   79.344524][    C0] RAX: ffffffffffffffda RBX: 00007f45c61e0740 RCX: 00007f45c626a407
[   79.352489][    C0] RDX: 0000000000000014 RSI: 00007fff5ef7c9c0 RDI: 0000000000000016
[   79.360448][    C0] RBP: 00007fff5ef7c9a4 R08: 00007fff5ef7c9a4 R09: 000000000000000c
[   79.368403][    C0] R10: 0000000000000000 R11: 0000000000000202 R12: 00007fff5ef9d2b0
[   79.376357][    C0] R13: 00007f45c61e06c8 R14: 00007fff5ef7caa0 R15: 00007fff5ef8d080
[   79.384327][    C0]  </TASK>
[   79.387327][    C0] Modules linked in:
[   79.391216][    C0] ---[ end trace 0000000000000000 ]---
[   79.396657][    C0] RIP: 0010:__list_del_entry_valid_or_report+0xdf/0x190
[   79.403589][    C0] Code: 49 39 1f 0f 85 9e 00 00 00 b0 01 5b 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc cc 48 c7 c7 40 c1 29 8c 48 89 de e8 c2 29 65 fc 90 <0f> 0b 48 c7 c7 a0 c1 29 8c 48 89 de e8 b0 29 65 fc 90 0f 0b 4c 89
[   79.423200][    C0] RSP: 0018:ffffc90000007d58 EFLAGS: 00010046
[   79.429261][    C0] RAX: 0000000000000033 RBX: ffff88806e888490 RCX: f63d3b529a1a7600
[   79.437219][    C0] RDX: 0000000000000100 RSI: 0000000080000102 RDI: 0000000000000000
[   79.445172][    C0] RBP: 0000000000000203 R08: ffffc90000007ae7 R09: 1ffff92000000f5c
[   79.453132][    C0] R10: dffffc0000000000 R11: fffff52000000f5d R12: 1ffff1100dd11092
[   79.461084][    C0] R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000
[   79.469035][    C0] FS:  00007f45c61e0740(0000) GS:ffff888125009000(0000) knlGS:0000000000000000
[   79.477943][    C0] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   79.484508][    C0] CR2: 0000561094e94138 CR3: 000000003472a000 CR4: 00000000003526f0
[   79.492468][    C0] Kernel panic - not syncing: Fatal exception in interrupt
[   79.500018][    C0] Kernel Offset: disabled
[   79.504325][    C0] Rebooting in 86400 seconds..


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-build1172046918=/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='go1.24.4'
GOWORK=''
PKG_CONFIG='pkg-config'

git status (err=<nil>)
HEAD detached at 1e62d198252
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=1e62d1982527c3b4e18df04d61f2560fa1f434cc -X github.com/google/syzkaller/prog.gitRevisionDate=20260213-152336"  ./sys/syz-sysgen | grep -q false || go install -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=1e62d1982527c3b4e18df04d61f2560fa1f434cc -X github.com/google/syzkaller/prog.gitRevisionDate=20260213-152336"  ./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=1e62d1982527c3b4e18df04d61f2560fa1f434cc -X github.com/google/syzkaller/prog.gitRevisionDate=20260213-152336"  -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=\"1e62d1982527c3b4e18df04d61f2560fa1f434cc\"
/usr/bin/ld: /tmp/ccL3cRx2.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


Error text is too large and was truncated, full error text is at:
https://syzkaller.appspot.com/x/error.txt?x=11bac006580000


Tested on:

commit:         779cae95 Add linux-next specific files for 20260223
git tree:       linux-next
kernel config:  https://syzkaller.appspot.com/x/.config?x=ee920513e4deca5f
dashboard link: https://syzkaller.appspot.com/bug?extid=7ea2f5e9dfd468201817
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=15d8e55a580000