WARNING in register_net_sysctl

------------[ cut here ]------------
sysctl net/ipv4/ipfrag_low_thresh: data points to kernel global data: ipfrag_low_thresh_unused
WARNING: CPU: 1 PID: 5010 at net/sysctl_net.c:155 ensure_safe_net_sysctl net/sysctl_net.c:155 [inline]
WARNING: CPU: 1 PID: 5010 at net/sysctl_net.c:155 register_net_sysctl+0x207/0x3c0 net/sysctl_net.c:167
Modules linked in:
CPU: 1 PID: 5010 Comm: syz-executor.0 Not tainted 6.4.0-rc2-next-20230516-syzkaller-02748-g885df05bf634 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
RIP: 0010:ensure_safe_net_sysctl net/sysctl_net.c:155 [inline]
RIP: 0010:register_net_sysctl+0x207/0x3c0 net/sysctl_net.c:167
Code: 8b 43 f4 48 89 f8 48 c1 e8 03 80 3c 28 00 0f 85 a9 01 00 00 48 8b 53 ec 4c 89 e9 4c 89 fe 48 c7 c7 c0 98 85 8b e8 69 13 7f f7 <0f> 0b 48 89 d8 48 c1 e8 03 0f b6 14 28 48 89 d8 83 e0 07 83 c0 01
RSP: 0018:ffffc90003b8fbf8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff8880229f5c54 RCX: 0000000000000000
RDX: ffff888028543b80 RSI: ffffffff814bd247 RDI: 0000000000000001
RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffff8880229f5c48
R13: ffffffff8b859740 R14: 0000000000000000 R15: ffffffff8b69e220
FS:  00005555565cf400(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7a42cd4620 CR3: 0000000070fd1000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ip4_frags_ns_ctl_register net/ipv4/ip_fragment.c:618 [inline]
 ipv4_frags_init_net net/ipv4/ip_fragment.c:689 [inline]
 ipv4_frags_init_net+0x269/0x430 net/ipv4/ip_fragment.c:660
 ops_init+0xb9/0x6b0 net/core/net_namespace.c:136
 setup_net+0x5d1/0xc50 net/core/net_namespace.c:339
 copy_net_ns+0x4ee/0x8e0 net/core/net_namespace.c:491
 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:228
 ksys_unshare+0x449/0x920 kernel/fork.c:3440
 __do_sys_unshare kernel/fork.c:3511 [inline]
 __se_sys_unshare kernel/fork.c:3509 [inline]
 __x64_sys_unshare+0x31/0x40 kernel/fork.c:3509
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f7a4208d697
Code: 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 10 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe7e76ce28 EFLAGS: 00000202 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007ffe7e76d468 RCX: 00007f7a4208d697
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000
RBP: 00000000ffffffff R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000003
R13: 00007ffe7e76cf00 R14: 00007f7a421ac9d8 R15: 000000000000000c
 </TASK>


DUID 00:04:34:47:30:ca:18:e7:c5:3a:a8:27:a7:3a:c9:9b:21:11
forked to background, child pid 4671
[   32.939225][ T4672] 8021q: adding VLAN 0 to HW filter on device bond0
[   32.951577][ T4672] eql: remember to turn off Van-Jacobson compression on your slave devices
Starting sshd: OK

syzkaller
Warning: Permanently added '10.128.0.5' (ECDSA) to the list of known hosts.
2023/05/16 22:42:53 fuzzer started
2023/05/16 22:42:54 connecting to host at 10.128.0.169:42043
2023/05/16 22:42:54 checking machine...
2023/05/16 22:42:54 checking revisions...
2023/05/16 22:42:54 testing simple program...
syzkaller login: [   59.337825][ T5008] cgroup: Unknown subsys name 'net'
[   59.491012][ T5008] cgroup: Unknown subsys name 'rlimit'
[   59.606916][ T5002] memfd_create() without MFD_EXEC nor MFD_NOEXEC_SEAL, pid=5002 'syz-fuzzer'
[   59.730780][ T5012] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[   59.738823][ T5012] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[   59.746805][ T5012] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[   59.755169][ T5012] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[   59.764819][ T5012] Bluetooth: hci0: unexpected cc 0x0c25 length: 249 > 3
[   59.773278][ T5012] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[   59.803990][ T5010] ------------[ cut here ]------------
[   59.809975][ T5010] sysctl net/ipv4/ipfrag_low_thresh: data points to kernel global data: ipfrag_low_thresh_unused
[   59.822127][ T5010] WARNING: CPU: 1 PID: 5010 at net/sysctl_net.c:155 register_net_sysctl+0x207/0x3c0
[   59.831675][ T5010] Modules linked in:
[   59.835740][ T5010] CPU: 1 PID: 5010 Comm: syz-executor.0 Not tainted 6.4.0-rc2-next-20230516-syzkaller-02748-g885df05bf634 #0
[   59.847805][ T5010] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
[   59.858513][ T5010] RIP: 0010:register_net_sysctl+0x207/0x3c0
[   59.864831][ T5010] Code: 8b 43 f4 48 89 f8 48 c1 e8 03 80 3c 28 00 0f 85 a9 01 00 00 48 8b 53 ec 4c 89 e9 4c 89 fe 48 c7 c7 c0 98 85 8b e8 69 13 7f f7 <0f> 0b 48 89 d8 48 c1 e8 03 0f b6 14 28 48 89 d8 83 e0 07 83 c0 01
[   59.884607][ T5010] RSP: 0018:ffffc90003b8fbf8 EFLAGS: 00010286
[   59.890791][ T5010] RAX: 0000000000000000 RBX: ffff8880229f5c54 RCX: 0000000000000000
[   59.898807][ T5010] RDX: ffff888028543b80 RSI: ffffffff814bd247 RDI: 0000000000000001
[   59.907333][ T5010] RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
[   59.915451][ T5010] R10: 0000000000000001 R11: 0000000000000001 R12: ffff8880229f5c48
[   59.923472][ T5010] R13: ffffffff8b859740 R14: 0000000000000000 R15: ffffffff8b69e220
[   59.931831][ T5010] FS:  00005555565cf400(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
[   59.940858][ T5010] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   59.947463][ T5010] CR2: 00007f7a42cd4620 CR3: 0000000070fd1000 CR4: 00000000003506e0
[   59.956759][ T5010] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   59.964972][ T5010] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   59.973076][ T5010] Call Trace:
[   59.976364][ T5010]  <TASK>
[   59.979303][ T5010]  ? ip4_frag_init+0x380/0x380
[   59.984264][ T5010]  ipv4_frags_init_net+0x269/0x430
[   59.989439][ T5010]  ops_init+0xb9/0x6b0
[   59.993805][ T5010]  setup_net+0x5d1/0xc50
[   59.998081][ T5010]  ? down_read_killable+0x14a/0x4f0
[   60.003388][ T5010]  ? ops_init+0x6b0/0x6b0
[   60.008031][ T5010]  copy_net_ns+0x4ee/0x8e0
[   60.012569][ T5010]  create_new_namespaces+0x3f6/0xb20
[   60.018170][ T5010]  unshare_nsproxy_namespaces+0xc1/0x1f0
[   60.023925][ T5010]  ksys_unshare+0x449/0x920
[   60.028556][ T5010]  ? unshare_fd+0x1c0/0x1c0
[   60.033316][ T5010]  ? unlock_page_memcg+0x3b0/0x3b0
[   60.038478][ T5010]  ? syscall_enter_from_user_mode+0x26/0x80
[   60.044498][ T5010]  __x64_sys_unshare+0x31/0x40
[   60.049313][ T5010]  do_syscall_64+0x39/0xb0
[   60.053894][ T5010]  entry_SYSCALL_64_after_hwframe+0x63/0xcd
[   60.059865][ T5010] RIP: 0033:0x7f7a4208d697
[   60.064623][ T5010] Code: 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 10 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
[   60.084944][ T5010] RSP: 002b:00007ffe7e76ce28 EFLAGS: 00000202 ORIG_RAX: 0000000000000110
[   60.093623][ T5010] RAX: ffffffffffffffda RBX: 00007ffe7e76d468 RCX: 00007f7a4208d697
[   60.101954][ T5010] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000
[   60.110333][ T5010] RBP: 00000000ffffffff R08: 0000000000000000 R09: 0000000000000000
[   60.118426][ T5010] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000003
[   60.126718][ T5010] R13: 00007ffe7e76cf00 R14: 00007f7a421ac9d8 R15: 000000000000000c
[   60.134863][ T5010]  </TASK>
[   60.137881][ T5010] Kernel panic - not syncing: kernel: panic_on_warn set ...
[   60.145936][ T5010] CPU: 1 PID: 5010 Comm: syz-executor.0 Not tainted 6.4.0-rc2-next-20230516-syzkaller-02748-g885df05bf634 #0
[   60.157498][ T5010] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
[   60.167996][ T5010] Call Trace:
[   60.171277][ T5010]  <TASK>
[   60.174752][ T5010]  dump_stack_lvl+0xd9/0x150
[   60.179383][ T5010]  panic+0x686/0x730
[   60.183307][ T5010]  ? panic_smp_self_stop+0xa0/0xa0
[   60.188472][ T5010]  ? show_trace_log_lvl+0x285/0x390
[   60.193724][ T5010]  ? register_net_sysctl+0x207/0x3c0
[   60.199031][ T5010]  check_panic_on_warn+0xb1/0xc0
[   60.204162][ T5010]  __warn+0xf2/0x390
[   60.208072][ T5010]  ? preempt_schedule_notrace+0x5f/0xd0
[   60.213624][ T5010]  ? register_net_sysctl+0x207/0x3c0
[   60.218914][ T5010]  report_bug+0x2da/0x500
[   60.223254][ T5010]  handle_bug+0x3c/0x70
[   60.227412][ T5010]  exc_invalid_op+0x18/0x50
[   60.231916][ T5010]  asm_exc_invalid_op+0x1a/0x20
[   60.236780][ T5010] RIP: 0010:register_net_sysctl+0x207/0x3c0
[   60.242681][ T5010] Code: 8b 43 f4 48 89 f8 48 c1 e8 03 80 3c 28 00 0f 85 a9 01 00 00 48 8b 53 ec 4c 89 e9 4c 89 fe 48 c7 c7 c0 98 85 8b e8 69 13 7f f7 <0f> 0b 48 89 d8 48 c1 e8 03 0f b6 14 28 48 89 d8 83 e0 07 83 c0 01
[   60.262295][ T5010] RSP: 0018:ffffc90003b8fbf8 EFLAGS: 00010286
[   60.268394][ T5010] RAX: 0000000000000000 RBX: ffff8880229f5c54 RCX: 0000000000000000
[   60.276629][ T5010] RDX: ffff888028543b80 RSI: ffffffff814bd247 RDI: 0000000000000001
[   60.284707][ T5010] RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
[   60.292890][ T5010] R10: 0000000000000001 R11: 0000000000000001 R12: ffff8880229f5c48
[   60.301394][ T5010] R13: ffffffff8b859740 R14: 0000000000000000 R15: ffffffff8b69e220
[   60.309377][ T5010]  ? __warn_printk+0x187/0x310
[   60.314259][ T5010]  ? register_net_sysctl+0x207/0x3c0
[   60.319557][ T5010]  ? ip4_frag_init+0x380/0x380
[   60.324356][ T5010]  ipv4_frags_init_net+0x269/0x430
[   60.329480][ T5010]  ops_init+0xb9/0x6b0
[   60.333669][ T5010]  setup_net+0x5d1/0xc50
[   60.337925][ T5010]  ? down_read_killable+0x14a/0x4f0
[   60.343147][ T5010]  ? ops_init+0x6b0/0x6b0
[   60.347533][ T5010]  copy_net_ns+0x4ee/0x8e0
[   60.351982][ T5010]  create_new_namespaces+0x3f6/0xb20
[   60.357411][ T5010]  unshare_nsproxy_namespaces+0xc1/0x1f0
[   60.363064][ T5010]  ksys_unshare+0x449/0x920
[   60.367580][ T5010]  ? unshare_fd+0x1c0/0x1c0
[   60.372097][ T5010]  ? unlock_page_memcg+0x3b0/0x3b0
[   60.377224][ T5010]  ? syscall_enter_from_user_mode+0x26/0x80
[   60.383310][ T5010]  __x64_sys_unshare+0x31/0x40
[   60.388104][ T5010]  do_syscall_64+0x39/0xb0
[   60.392540][ T5010]  entry_SYSCALL_64_after_hwframe+0x63/0xcd
[   60.398620][ T5010] RIP: 0033:0x7f7a4208d697
[   60.403036][ T5010] Code: 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 10 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
[   60.422650][ T5010] RSP: 002b:00007ffe7e76ce28 EFLAGS: 00000202 ORIG_RAX: 0000000000000110
[   60.431204][ T5010] RAX: ffffffffffffffda RBX: 00007ffe7e76d468 RCX: 00007f7a4208d697
[   60.439177][ T5010] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000
[   60.447243][ T5010] RBP: 00000000ffffffff R08: 0000000000000000 R09: 0000000000000000
[   60.455225][ T5010] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000003
[   60.463196][ T5010] R13: 00007ffe7e76cf00 R14: 00007f7a421ac9d8 R15: 000000000000000c
[   60.471734][ T5010]  </TASK>
[   60.475411][ T5010] Kernel Offset: disabled
[   60.479931][ T5010] Rebooting in 86400 seconds..


syzkaller build log:
go env (err=<nil>)
GO111MODULE="auto"
GOARCH="amd64"
GOBIN=""
GOCACHE="/syzkaller/.cache/go-build"
GOENV="/syzkaller/.config/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
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"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"
GOVCS=""
GOVERSION="go1.20.1"
GCCGO="gccgo"
GOAMD64="v1"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/syzkaller/jobs-2/linux/gopath/src/github.com/google/syzkaller/go.mod"
GOWORK=""
CGO_CFLAGS="-O2 -g"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-O2 -g"
CGO_FFLAGS="-O2 -g"
CGO_LDFLAGS="-O2 -g"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build3126300492=/tmp/go-build -gno-record-gcc-switches"

git status (err=<nil>)
HEAD detached at d3e76707b
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:32: run command via tools/syz-env for best compatibility, see:
Makefile:33: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
go list -f '{{.Stale}}' ./sys/syz-sysgen | grep -q false || go install ./sys/syz-sysgen
make .descriptions
tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
bin/syz-sysgen
touch .descriptions
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=d3e76707bdc63efba0c6f891212c658a0690003c -X 'github.com/google/syzkaller/prog.gitRevisionDate=20221220-100639'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-fuzzer github.com/google/syzkaller/syz-fuzzer
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=d3e76707bdc63efba0c6f891212c658a0690003c -X 'github.com/google/syzkaller/prog.gitRevisionDate=20221220-100639'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-execprog github.com/google/syzkaller/tools/syz-execprog
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=d3e76707bdc63efba0c6f891212c658a0690003c -X 'github.com/google/syzkaller/prog.gitRevisionDate=20221220-100639'" "-tags=syz_target syz_os_linux syz_arch_amd64 " -o ./bin/linux_amd64/syz-stress github.com/google/syzkaller/tools/syz-stress
mkdir -p ./bin/linux_amd64
gcc -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 -static-pie -fpermissive -w -DGOOS_linux=1 -DGOARCH_amd64=1 \
	-DHOSTGOOS_linux=1 -DGIT_REVISION=\"d3e76707bdc63efba0c6f891212c658a0690003c\"