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: 5007 at net/sysctl_net.c:155 ensure_safe_net_sysctl net/sysctl_net.c:155 [inline]
WARNING: CPU: 0 PID: 5007 at net/sysctl_net.c:155 register_net_sysctl+0x207/0x3c0 net/sysctl_net.c:167
Modules linked in:
CPU: 0 PID: 5007 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:ffffc90003acfbf8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff88802b8a8054 RCX: 0000000000000000
RDX: ffff888027660000 RSI: ffffffff814bd247 RDI: 0000000000000001
RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffff88802b8a8048
R13: ffffffff8b859740 R14: 0000000000000000 R15: ffffffff8b69e220
FS:  00005555567d2400(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000564f71c86bd8 CR3: 0000000076ac3000 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: 0033:0x7fdaef88d6b7
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:00007fff119bfe38 EFLAGS: 00000202 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007fff119c0478 RCX: 00007fdaef88d6b7
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000
RBP: 00000000ffffffff R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000003
R13: 00007fff119bff10 R14: 00007fdaef9ac9d8 R15: 000000000000000c
 </TASK>


Warning: Permanently added '10.128.1.15' (ECDSA) to the list of known hosts.
2023/05/16 09:30:57 fuzzer started
2023/05/16 09:30:57 connecting to host at 10.128.0.169:36625
2023/05/16 09:30:57 checking machine...
2023/05/16 09:30:57 checking revisions...
2023/05/16 09:30:58 testing simple program...
[   58.265334][ T5005] cgroup: Unknown subsys name 'net'
[   58.468106][ T5005] cgroup: Unknown subsys name 'rlimit'
[   58.566534][ T4998] memfd_create() without MFD_EXEC nor MFD_NOEXEC_SEAL, pid=4998 'syz-fuzzer'
[   58.692922][ T5010] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[   58.700984][ T5010] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[   58.709039][ T5010] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[   58.716787][ T5010] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[   58.725481][ T5010] Bluetooth: hci0: unexpected cc 0x0c25 length: 249 > 3
[   58.732955][ T5010] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[   58.767294][ T5007] ------------[ cut here ]------------
[   58.772977][ T5007] sysctl net/ipv4/ipfrag_low_thresh: data points to kernel global data: ipfrag_low_thresh_unused
[   58.784561][ T5007] WARNING: CPU: 0 PID: 5007 at net/sysctl_net.c:155 register_net_sysctl+0x207/0x3c0
[   58.794155][ T5007] Modules linked in:
[   58.798250][ T5007] CPU: 0 PID: 5007 Comm: syz-executor.0 Not tainted 6.4.0-rc2-next-20230516-syzkaller-02748-g885df05bf634 #0
[   58.810653][ T5007] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
[   58.820934][ T5007] RIP: 0010:register_net_sysctl+0x207/0x3c0
[   58.827039][ T5007] 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
[   58.846930][ T5007] RSP: 0018:ffffc90003acfbf8 EFLAGS: 00010286
[   58.853678][ T5007] RAX: 0000000000000000 RBX: ffff88802b8a8054 RCX: 0000000000000000
[   58.861775][ T5007] RDX: ffff888027660000 RSI: ffffffff814bd247 RDI: 0000000000000001
[   58.869843][ T5007] RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
[   58.877901][ T5007] R10: 0000000000000001 R11: 0000000000000001 R12: ffff88802b8a8048
[   58.885999][ T5007] R13: ffffffff8b859740 R14: 0000000000000000 R15: ffffffff8b69e220
[   58.894270][ T5007] FS:  00005555567d2400(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
[   58.903407][ T5007] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   58.910117][ T5007] CR2: 0000564f71c86bd8 CR3: 0000000076ac3000 CR4: 00000000003506f0
[   58.918311][ T5007] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   58.926411][ T5007] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   58.934661][ T5007] Call Trace:
[   58.937980][ T5007]  <TASK>
[   58.940910][ T5007]  ? ip4_frag_init+0x380/0x380
[   58.945718][ T5007]  ipv4_frags_init_net+0x269/0x430
[   58.950951][ T5007]  ops_init+0xb9/0x6b0
[   58.955070][ T5007]  setup_net+0x5d1/0xc50
[   58.959536][ T5007]  ? down_read_killable+0x14a/0x4f0
[   58.964796][ T5007]  ? ops_init+0x6b0/0x6b0
[   58.969411][ T5007]  copy_net_ns+0x4ee/0x8e0
[   58.973958][ T5007]  create_new_namespaces+0x3f6/0xb20
[   58.979378][ T5007]  unshare_nsproxy_namespaces+0xc1/0x1f0
[   58.985073][ T5007]  ksys_unshare+0x449/0x920
[   58.989763][ T5007]  ? unshare_fd+0x1c0/0x1c0
[   58.994309][ T5007]  ? unlock_page_memcg+0x3b0/0x3b0
[   58.999527][ T5007]  ? syscall_enter_from_user_mode+0x26/0x80
[   59.006370][ T5007]  __x64_sys_unshare+0x31/0x40
[   59.011269][ T5007]  do_syscall_64+0x39/0xb0
[   59.015721][ T5007]  entry_SYSCALL_64_after_hwframe+0x63/0xcd
[   59.021688][ T5007] RIP: 0033:0x7fdaef88d6b7
[   59.026118][ T5007] 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
[   59.045857][ T5007] RSP: 002b:00007fff119bfe38 EFLAGS: 00000202 ORIG_RAX: 0000000000000110
[   59.054470][ T5007] RAX: ffffffffffffffda RBX: 00007fff119c0478 RCX: 00007fdaef88d6b7
[   59.062548][ T5007] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000
[   59.070587][ T5007] RBP: 00000000ffffffff R08: 0000000000000000 R09: 0000000000000000
[   59.078635][ T5007] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000003
[   59.091393][ T5007] R13: 00007fff119bff10 R14: 00007fdaef9ac9d8 R15: 000000000000000c
[   59.099462][ T5007]  </TASK>
[   59.103044][ T5007] Kernel panic - not syncing: kernel: panic_on_warn set ...
[   59.110327][ T5007] CPU: 0 PID: 5007 Comm: syz-executor.0 Not tainted 6.4.0-rc2-next-20230516-syzkaller-02748-g885df05bf634 #0
[   59.122010][ T5007] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
[   59.132078][ T5007] Call Trace:
[   59.135361][ T5007]  <TASK>
[   59.138431][ T5007]  dump_stack_lvl+0xd9/0x150
[   59.143023][ T5007]  panic+0x686/0x730
[   59.146958][ T5007]  ? panic_smp_self_stop+0xa0/0xa0
[   59.152121][ T5007]  ? show_trace_log_lvl+0x285/0x390
[   59.157433][ T5007]  ? register_net_sysctl+0x207/0x3c0
[   59.162774][ T5007]  check_panic_on_warn+0xb1/0xc0
[   59.167741][ T5007]  __warn+0xf2/0x390
[   59.171956][ T5007]  ? preempt_schedule_notrace+0x5f/0xd0
[   59.177637][ T5007]  ? register_net_sysctl+0x207/0x3c0
[   59.183117][ T5007]  report_bug+0x2da/0x500
[   59.187462][ T5007]  handle_bug+0x3c/0x70
[   59.191630][ T5007]  exc_invalid_op+0x18/0x50
[   59.196140][ T5007]  asm_exc_invalid_op+0x1a/0x20
[   59.201107][ T5007] RIP: 0010:register_net_sysctl+0x207/0x3c0
[   59.207101][ T5007] 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
[   59.227236][ T5007] RSP: 0018:ffffc90003acfbf8 EFLAGS: 00010286
[   59.233338][ T5007] RAX: 0000000000000000 RBX: ffff88802b8a8054 RCX: 0000000000000000
[   59.241424][ T5007] RDX: ffff888027660000 RSI: ffffffff814bd247 RDI: 0000000000000001
[   59.249425][ T5007] RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
[   59.257833][ T5007] R10: 0000000000000001 R11: 0000000000000001 R12: ffff88802b8a8048
[   59.265984][ T5007] R13: ffffffff8b859740 R14: 0000000000000000 R15: ffffffff8b69e220
[   59.274013][ T5007]  ? __warn_printk+0x187/0x310
[   59.279123][ T5007]  ? register_net_sysctl+0x207/0x3c0
[   59.284547][ T5007]  ? ip4_frag_init+0x380/0x380
[   59.289443][ T5007]  ipv4_frags_init_net+0x269/0x430
[   59.294573][ T5007]  ops_init+0xb9/0x6b0
[   59.298769][ T5007]  setup_net+0x5d1/0xc50
[   59.303022][ T5007]  ? down_read_killable+0x14a/0x4f0
[   59.308323][ T5007]  ? ops_init+0x6b0/0x6b0
[   59.312693][ T5007]  copy_net_ns+0x4ee/0x8e0
[   59.317214][ T5007]  create_new_namespaces+0x3f6/0xb20
[   59.322961][ T5007]  unshare_nsproxy_namespaces+0xc1/0x1f0
[   59.328617][ T5007]  ksys_unshare+0x449/0x920
[   59.333146][ T5007]  ? unshare_fd+0x1c0/0x1c0
[   59.337752][ T5007]  ? unlock_page_memcg+0x3b0/0x3b0
[   59.343179][ T5007]  ? syscall_enter_from_user_mode+0x26/0x80
[   59.349403][ T5007]  __x64_sys_unshare+0x31/0x40
[   59.354214][ T5007]  do_syscall_64+0x39/0xb0
[   59.358644][ T5007]  entry_SYSCALL_64_after_hwframe+0x63/0xcd
[   59.364552][ T5007] RIP: 0033:0x7fdaef88d6b7
[   59.368969][ T5007] 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
[   59.389061][ T5007] RSP: 002b:00007fff119bfe38 EFLAGS: 00000202 ORIG_RAX: 0000000000000110
[   59.397592][ T5007] RAX: ffffffffffffffda RBX: 00007fff119c0478 RCX: 00007fdaef88d6b7
[   59.405692][ T5007] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000
[   59.413674][ T5007] RBP: 00000000ffffffff R08: 0000000000000000 R09: 0000000000000000
[   59.421659][ T5007] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000003
[   59.429638][ T5007] R13: 00007fff119bff10 R14: 00007fdaef9ac9d8 R15: 000000000000000c
[   59.437631][ T5007]  </TASK>
[   59.440834][ T5007] Kernel Offset: disabled
[   59.445295][ T5007] 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/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"
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/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-build1542806455=/tmp/go-build -gno-record-gcc-switches"

git status (err=<nil>)
HEAD detached at 93e26d605
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=93e26d605eebce2ad19e6f37d9e96a872ca55cce -X 'github.com/google/syzkaller/prog.gitRevisionDate=20230210-192433'" "-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=93e26d605eebce2ad19e6f37d9e96a872ca55cce -X 'github.com/google/syzkaller/prog.gitRevisionDate=20230210-192433'" "-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=93e26d605eebce2ad19e6f37d9e96a872ca55cce -X 'github.com/google/syzkaller/prog.gitRevisionDate=20230210-192433'" "-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=\"93e26d605eebce2ad19e6f37d9e96a872ca55cce\"