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: 0 PID: 5002 at net/sysctl_net.c:155 ensure_safe_net_sysctl net/sysctl_net.c:155 [inline]
WARNING: CPU: 0 PID: 5002 at net/sysctl_net.c:155 register_net_sysctl+0x207/0x3c0 net/sysctl_net.c:167
Modules linked in:
CPU: 0 PID: 5002 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:ffffc90003c5fbf8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff88802c07b054 RCX: 0000000000000000
RDX: ffff88801e728000 RSI: ffffffff814bd247 RDI: 0000000000000001
RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffff88802c07b048
R13: ffffffff8b859740 R14: 0000000000000000 R15: ffffffff8b69e220
FS:  0000555555790400(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdbfa8d4620 CR3: 0000000070191000 CR4: 00000000003506f0
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: 0033:0x7fdbf9c8d687
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:00007fffd0fb15f8 EFLAGS: 00000202 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007fffd0fb1c38 RCX: 00007fdbf9c8d687
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000
RBP: 00000000ffffffff R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000003
R13: 00007fffd0fb16d0 R14: 00007fdbf9dac9d8 R15: 000000000000000c
 </TASK>


DUID 00:04:bc:75:22:1c:bd:a7:21:14:02:3c:35:d8:4f:be:4d:56
forked to background, child pid 4667
[   34.211935][ T4668] 8021q: adding VLAN 0 to HW filter on device bond0
[   34.232918][ T4668] eql: remember to turn off Van-Jacobson compression on your slave devices
Starting sshd: OK

syzkaller
Warning: Permanently added '10.128.0.3' (ECDSA) to the list of known hosts.
2023/05/16 10:01:30 fuzzer started
2023/05/16 10:01:30 connecting to host at 10.128.0.169:35301
2023/05/16 10:01:30 checking machine...
2023/05/16 10:01:30 checking revisions...
2023/05/16 10:01:31 testing simple program...
syzkaller login: [   57.483745][ T5000] cgroup: Unknown subsys name 'net'
[   57.630362][ T5000] cgroup: Unknown subsys name 'rlimit'
[   57.796830][ T4997] memfd_create() without MFD_EXEC nor MFD_NOEXEC_SEAL, pid=4997 'syz-fuzzer'
[   57.915592][   T48] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[   57.923888][   T48] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[   57.931743][   T48] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[   57.940209][   T48] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[   57.948019][   T48] Bluetooth: hci0: unexpected cc 0x0c25 length: 249 > 3
[   57.955625][   T48] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[   57.985957][ T5002] ------------[ cut here ]------------
[   57.991591][ T5002] sysctl net/ipv4/ipfrag_low_thresh: data points to kernel global data: ipfrag_low_thresh_unused
[   58.003058][ T5002] WARNING: CPU: 0 PID: 5002 at net/sysctl_net.c:155 register_net_sysctl+0x207/0x3c0
[   58.012654][ T5002] Modules linked in:
[   58.016558][ T5002] CPU: 0 PID: 5002 Comm: syz-executor.0 Not tainted 6.4.0-rc2-next-20230516-syzkaller-02748-g885df05bf634 #0
[   58.028159][ T5002] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
[   58.038267][ T5002] RIP: 0010:register_net_sysctl+0x207/0x3c0
[   58.044238][ T5002] 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
[   58.064043][ T5002] RSP: 0018:ffffc90003c5fbf8 EFLAGS: 00010286
[   58.070149][ T5002] RAX: 0000000000000000 RBX: ffff88802c07b054 RCX: 0000000000000000
[   58.078136][ T5002] RDX: ffff88801e728000 RSI: ffffffff814bd247 RDI: 0000000000000001
[   58.086172][ T5002] RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
[   58.094194][ T5002] R10: 0000000000000001 R11: 0000000000000001 R12: ffff88802c07b048
[   58.102233][ T5002] R13: ffffffff8b859740 R14: 0000000000000000 R15: ffffffff8b69e220
[   58.110357][ T5002] FS:  0000555555790400(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
[   58.119368][ T5002] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   58.125979][ T5002] CR2: 00007fdbfa8d4620 CR3: 0000000070191000 CR4: 00000000003506f0
[   58.134020][ T5002] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   58.142045][ T5002] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   58.150062][ T5002] Call Trace:
[   58.153351][ T5002]  <TASK>
[   58.156290][ T5002]  ? ip4_frag_init+0x380/0x380
[   58.161122][ T5002]  ipv4_frags_init_net+0x269/0x430
[   58.166361][ T5002]  ops_init+0xb9/0x6b0
[   58.170485][ T5002]  setup_net+0x5d1/0xc50
[   58.174754][ T5002]  ? down_read_killable+0x14a/0x4f0
[   58.180021][ T5002]  ? ops_init+0x6b0/0x6b0
[   58.184467][ T5002]  copy_net_ns+0x4ee/0x8e0
[   58.188957][ T5002]  create_new_namespaces+0x3f6/0xb20
[   58.194277][ T5002]  unshare_nsproxy_namespaces+0xc1/0x1f0
[   58.199987][ T5002]  ksys_unshare+0x449/0x920
[   58.204522][ T5002]  ? unshare_fd+0x1c0/0x1c0
[   58.209103][ T5002]  ? unlock_page_memcg+0x3b0/0x3b0
[   58.214254][ T5002]  ? syscall_enter_from_user_mode+0x26/0x80
[   58.220256][ T5002]  __x64_sys_unshare+0x31/0x40
[   58.225134][ T5002]  do_syscall_64+0x39/0xb0
[   58.229595][ T5002]  entry_SYSCALL_64_after_hwframe+0x63/0xcd
[   58.235606][ T5002] RIP: 0033:0x7fdbf9c8d687
[   58.240100][ T5002] 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
[   58.259785][ T5002] RSP: 002b:00007fffd0fb15f8 EFLAGS: 00000202 ORIG_RAX: 0000000000000110
[   58.268224][ T5002] RAX: ffffffffffffffda RBX: 00007fffd0fb1c38 RCX: 00007fdbf9c8d687
[   58.276253][ T5002] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000
[   58.284314][ T5002] RBP: 00000000ffffffff R08: 0000000000000000 R09: 0000000000000000
[   58.292328][ T5002] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000003
[   58.300353][ T5002] R13: 00007fffd0fb16d0 R14: 00007fdbf9dac9d8 R15: 000000000000000c
[   58.308331][ T5002]  </TASK>
[   58.311389][ T5002] Kernel panic - not syncing: kernel: panic_on_warn set ...
[   58.318672][ T5002] CPU: 0 PID: 5002 Comm: syz-executor.0 Not tainted 6.4.0-rc2-next-20230516-syzkaller-02748-g885df05bf634 #0
[   58.330383][ T5002] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
[   58.340432][ T5002] Call Trace:
[   58.343892][ T5002]  <TASK>
[   58.346812][ T5002]  dump_stack_lvl+0xd9/0x150
[   58.351408][ T5002]  panic+0x686/0x730
[   58.355302][ T5002]  ? panic_smp_self_stop+0xa0/0xa0
[   58.360413][ T5002]  ? show_trace_log_lvl+0x285/0x390
[   58.365616][ T5002]  ? register_net_sysctl+0x207/0x3c0
[   58.370900][ T5002]  check_panic_on_warn+0xb1/0xc0
[   58.375857][ T5002]  __warn+0xf2/0x390
[   58.379766][ T5002]  ? preempt_schedule_notrace+0x5f/0xd0
[   58.385404][ T5002]  ? register_net_sysctl+0x207/0x3c0
[   58.390697][ T5002]  report_bug+0x2da/0x500
[   58.395130][ T5002]  handle_bug+0x3c/0x70
[   58.399293][ T5002]  exc_invalid_op+0x18/0x50
[   58.403806][ T5002]  asm_exc_invalid_op+0x1a/0x20
[   58.408670][ T5002] RIP: 0010:register_net_sysctl+0x207/0x3c0
[   58.414576][ T5002] 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
[   58.434184][ T5002] RSP: 0018:ffffc90003c5fbf8 EFLAGS: 00010286
[   58.440256][ T5002] RAX: 0000000000000000 RBX: ffff88802c07b054 RCX: 0000000000000000
[   58.448400][ T5002] RDX: ffff88801e728000 RSI: ffffffff814bd247 RDI: 0000000000000001
[   58.456460][ T5002] RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
[   58.464434][ T5002] R10: 0000000000000001 R11: 0000000000000001 R12: ffff88802c07b048
[   58.472405][ T5002] R13: ffffffff8b859740 R14: 0000000000000000 R15: ffffffff8b69e220
[   58.480386][ T5002]  ? __warn_printk+0x187/0x310
[   58.485866][ T5002]  ? register_net_sysctl+0x207/0x3c0
[   58.491164][ T5002]  ? ip4_frag_init+0x380/0x380
[   58.495946][ T5002]  ipv4_frags_init_net+0x269/0x430
[   58.501069][ T5002]  ops_init+0xb9/0x6b0
[   58.505165][ T5002]  setup_net+0x5d1/0xc50
[   58.509416][ T5002]  ? down_read_killable+0x14a/0x4f0
[   58.514658][ T5002]  ? ops_init+0x6b0/0x6b0
[   58.519052][ T5002]  copy_net_ns+0x4ee/0x8e0
[   58.523483][ T5002]  create_new_namespaces+0x3f6/0xb20
[   58.528790][ T5002]  unshare_nsproxy_namespaces+0xc1/0x1f0
[   58.534446][ T5002]  ksys_unshare+0x449/0x920
[   58.538964][ T5002]  ? unshare_fd+0x1c0/0x1c0
[   58.543478][ T5002]  ? unlock_page_memcg+0x3b0/0x3b0
[   58.548600][ T5002]  ? syscall_enter_from_user_mode+0x26/0x80
[   58.554510][ T5002]  __x64_sys_unshare+0x31/0x40
[   58.559568][ T5002]  do_syscall_64+0x39/0xb0
[   58.563992][ T5002]  entry_SYSCALL_64_after_hwframe+0x63/0xcd
[   58.569906][ T5002] RIP: 0033:0x7fdbf9c8d687
[   58.574327][ T5002] 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
[   58.594023][ T5002] RSP: 002b:00007fffd0fb15f8 EFLAGS: 00000202 ORIG_RAX: 0000000000000110
[   58.602442][ T5002] RAX: ffffffffffffffda RBX: 00007fffd0fb1c38 RCX: 00007fdbf9c8d687
[   58.610589][ T5002] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000
[   58.618643][ T5002] RBP: 00000000ffffffff R08: 0000000000000000 R09: 0000000000000000
[   58.626628][ T5002] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000003
[   58.634601][ T5002] R13: 00007fffd0fb16d0 R14: 00007fdbf9dac9d8 R15: 000000000000000c
[   58.642605][ T5002]  </TASK>
[   58.645769][ T5002] Kernel Offset: disabled
[   58.650198][ T5002] 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-build2573239778=/tmp/go-build -gno-record-gcc-switches"

git status (err=<nil>)
HEAD detached at be607b78d
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=be607b78d7dea8ef5a0267ae7396fded7dc016d5 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20230204-105222'" "-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=be607b78d7dea8ef5a0267ae7396fded7dc016d5 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20230204-105222'" "-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=be607b78d7dea8ef5a0267ae7396fded7dc016d5 -X 'github.com/google/syzkaller/prog.gitRevisionDate=20230204-105222'" "-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 -Wno-unused-but-set-variable -Wno-unused-command-line-argument -static-pie -fpermissive -w -DGOOS_linux=1 -DGOARCH_amd64=1 \
	-DHOSTGOOS_linux=1 -DGIT_REVISION=\"be607b78d7dea8ef5a0267ae7396fded7dc016d5\"