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: 5004 at net/sysctl_net.c:155 ensure_safe_net_sysctl net/sysctl_net.c:155 [inline]
WARNING: CPU: 0 PID: 5004 at net/sysctl_net.c:155 register_net_sysctl+0x207/0x3c0 net/sysctl_net.c:167
Modules linked in:
CPU: 0 PID: 5004 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:ffffc90003a9fbf8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff88802184b854 RCX: 0000000000000000
RDX: ffff88807e5c8000 RSI: ffffffff814bd247 RDI: 0000000000000001
RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffff88802184b848
R13: ffffffff8b859740 R14: 0000000000000000 R15: ffffffff8b69e220
FS:  00000000016bf400(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000014a4320 CR3: 000000006f61d000 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: 0033:0x467b97
Code: 73 01 c3 48 c7 c1 bc 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff63df06b8 EFLAGS: 00000206 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007fff63df0cd8 RCX: 0000000000467b97
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000040000000
RBP: 00007fff63df0770 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 00000000ffffffff
R13: 000000000056cb88 R14: 0000000000000000 R15: 00000000000000f8
 </TASK>


forked to background, child pid 4669
[   33.421252][ T4670] 8021q: adding VLAN 0 to HW filter on device bond0
[   33.431534][ T4670] eql: remember to turn off Van-Jacobson compression on your slave devices
Starting sshd: [   33.775578][ T4745] sshd (4745) used greatest stack depth: 22144 bytes left
OK

syzkaller
Warning: Permanently added '10.128.1.170' (ECDSA) to the list of known hosts.
2023/05/16 19:33:09 ignoring optional flag "raw_cover"="false"
2023/05/16 19:33:09 ignoring optional flag "sandbox_arg"="0"
2023/05/16 19:33:09 fuzzer started
2023/05/16 19:33:09 connecting to host at 10.128.0.169:33749
2023/05/16 19:33:09 checking machine...
2023/05/16 19:33:09 checking revisions...
2023/05/16 19:33:09 testing simple program...
syzkaller login: [   54.357678][ T5005] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[   54.365817][ T5005] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[   54.374003][ T5005] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[   54.381776][ T5005] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[   54.389958][ T5005] Bluetooth: hci0: unexpected cc 0x0c25 length: 249 > 3
[   54.397549][ T5005] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[   54.425780][ T5004] ------------[ cut here ]------------
[   54.431633][ T5004] sysctl net/ipv4/ipfrag_low_thresh: data points to kernel global data: ipfrag_low_thresh_unused
[   54.443252][ T5004] WARNING: CPU: 0 PID: 5004 at net/sysctl_net.c:155 register_net_sysctl+0x207/0x3c0
[   54.452814][ T5004] Modules linked in:
[   54.456702][ T5004] CPU: 0 PID: 5004 Comm: syz-executor.0 Not tainted 6.4.0-rc2-next-20230516-syzkaller-02748-g885df05bf634 #0
[   54.468640][ T5004] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
[   54.478801][ T5004] RIP: 0010:register_net_sysctl+0x207/0x3c0
[   54.484777][ T5004] 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
[   54.504821][ T5004] RSP: 0018:ffffc90003a9fbf8 EFLAGS: 00010286
[   54.510891][ T5004] RAX: 0000000000000000 RBX: ffff88802184b854 RCX: 0000000000000000
[   54.518961][ T5004] RDX: ffff88807e5c8000 RSI: ffffffff814bd247 RDI: 0000000000000001
[   54.527139][ T5004] RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
[   54.535186][ T5004] R10: 0000000000000001 R11: 0000000000000001 R12: ffff88802184b848
[   54.543211][ T5004] R13: ffffffff8b859740 R14: 0000000000000000 R15: ffffffff8b69e220
[   54.551444][ T5004] FS:  00000000016bf400(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
[   54.560413][ T5004] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   54.567227][ T5004] CR2: 00000000014a4320 CR3: 000000006f61d000 CR4: 00000000003506f0
[   54.575238][ T5004] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   54.583295][ T5004] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   54.591270][ T5004] Call Trace:
[   54.594598][ T5004]  <TASK>
[   54.597559][ T5004]  ? ip4_frag_init+0x380/0x380
[   54.602491][ T5004]  ipv4_frags_init_net+0x269/0x430
[   54.607725][ T5004]  ops_init+0xb9/0x6b0
[   54.611795][ T5004]  setup_net+0x5d1/0xc50
[   54.616081][ T5004]  ? down_read_killable+0x14a/0x4f0
[   54.621326][ T5004]  ? ops_init+0x6b0/0x6b0
[   54.625744][ T5004]  copy_net_ns+0x4ee/0x8e0
[   54.630189][ T5004]  create_new_namespaces+0x3f6/0xb20
[   54.635526][ T5004]  unshare_nsproxy_namespaces+0xc1/0x1f0
[   54.641327][ T5004]  ksys_unshare+0x449/0x920
[   54.645932][ T5004]  ? unshare_fd+0x1c0/0x1c0
[   54.650458][ T5004]  ? unlock_page_memcg+0x3b0/0x3b0
[   54.655795][ T5004]  ? syscall_enter_from_user_mode+0x26/0x80
[   54.661720][ T5004]  __x64_sys_unshare+0x31/0x40
[   54.666611][ T5004]  do_syscall_64+0x39/0xb0
[   54.671065][ T5004]  entry_SYSCALL_64_after_hwframe+0x63/0xcd
[   54.677091][ T5004] RIP: 0033:0x467b97
[   54.680996][ T5004] Code: 73 01 c3 48 c7 c1 bc 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 bc ff ff ff f7 d8 64 89 01 48
[   54.700682][ T5004] RSP: 002b:00007fff63df06b8 EFLAGS: 00000206 ORIG_RAX: 0000000000000110
[   54.709281][ T5004] RAX: ffffffffffffffda RBX: 00007fff63df0cd8 RCX: 0000000000467b97
[   54.717390][ T5004] RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000040000000
[   54.725946][ T5004] RBP: 00007fff63df0770 R08: 0000000000000000 R09: 0000000000000000
[   54.734013][ T5004] R10: 0000000000000000 R11: 0000000000000206 R12: 00000000ffffffff
[   54.742096][ T5004] R13: 000000000056cb88 R14: 0000000000000000 R15: 00000000000000f8
[   54.750273][ T5004]  </TASK>
[   54.753370][ T5004] Kernel panic - not syncing: kernel: panic_on_warn set ...
[   54.760763][ T5004] CPU: 0 PID: 5004 Comm: syz-executor.0 Not tainted 6.4.0-rc2-next-20230516-syzkaller-02748-g885df05bf634 #0
[   54.772317][ T5004] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
[   54.782384][ T5004] Call Trace:
[   54.785703][ T5004]  <TASK>
[   54.788691][ T5004]  dump_stack_lvl+0xd9/0x150
[   54.793425][ T5004]  panic+0x686/0x730
[   54.797433][ T5004]  ? panic_smp_self_stop+0xa0/0xa0
[   54.802569][ T5004]  ? show_trace_log_lvl+0x285/0x390
[   54.807793][ T5004]  ? register_net_sysctl+0x207/0x3c0
[   54.813079][ T5004]  check_panic_on_warn+0xb1/0xc0
[   54.818020][ T5004]  __warn+0xf2/0x390
[   54.821913][ T5004]  ? preempt_schedule_notrace+0x5f/0xd0
[   54.827579][ T5004]  ? register_net_sysctl+0x207/0x3c0
[   54.832862][ T5004]  report_bug+0x2da/0x500
[   54.837249][ T5004]  handle_bug+0x3c/0x70
[   54.841411][ T5004]  exc_invalid_op+0x18/0x50
[   54.846091][ T5004]  asm_exc_invalid_op+0x1a/0x20
[   54.851124][ T5004] RIP: 0010:register_net_sysctl+0x207/0x3c0
[   54.857115][ T5004] 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
[   54.876850][ T5004] RSP: 0018:ffffc90003a9fbf8 EFLAGS: 00010286
[   54.883108][ T5004] RAX: 0000000000000000 RBX: ffff88802184b854 RCX: 0000000000000000
[   54.891254][ T5004] RDX: ffff88807e5c8000 RSI: ffffffff814bd247 RDI: 0000000000000001
[   54.899590][ T5004] RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
[   54.907562][ T5004] R10: 0000000000000001 R11: 0000000000000001 R12: ffff88802184b848
[   54.915540][ T5004] R13: ffffffff8b859740 R14: 0000000000000000 R15: ffffffff8b69e220
[   54.923522][ T5004]  ? __warn_printk+0x187/0x310
[   54.928481][ T5004]  ? register_net_sysctl+0x207/0x3c0
[   54.933778][ T5004]  ? ip4_frag_init+0x380/0x380
[   54.938637][ T5004]  ipv4_frags_init_net+0x269/0x430
[   54.943763][ T5004]  ops_init+0xb9/0x6b0
[   54.947851][ T5004]  setup_net+0x5d1/0xc50
[   54.952103][ T5004]  ? down_read_killable+0x14a/0x4f0
[   54.957313][ T5004]  ? ops_init+0x6b0/0x6b0
[   54.961659][ T5004]  copy_net_ns+0x4ee/0x8e0
[   54.966093][ T5004]  create_new_namespaces+0x3f6/0xb20
[   54.971399][ T5004]  unshare_nsproxy_namespaces+0xc1/0x1f0
[   54.977048][ T5004]  ksys_unshare+0x449/0x920
[   54.981564][ T5004]  ? unshare_fd+0x1c0/0x1c0
[   54.986079][ T5004]  ? unlock_page_memcg+0x3b0/0x3b0
[   54.991200][ T5004]  ? syscall_enter_from_user_mode+0x26/0x80
[   54.997371][ T5004]  __x64_sys_unshare+0x31/0x40
[   55.002155][ T5004]  do_syscall_64+0x39/0xb0
[   55.006578][ T5004]  entry_SYSCALL_64_after_hwframe+0x63/0xcd
[   55.012566][ T5004] RIP: 0033:0x467b97
[   55.016461][ T5004] Code: 73 01 c3 48 c7 c1 bc 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 bc ff ff ff f7 d8 64 89 01 48
[   55.036246][ T5004] RSP: 002b:00007fff63df06b8 EFLAGS: 00000206 ORIG_RAX: 0000000000000110
[   55.044669][ T5004] RAX: ffffffffffffffda RBX: 00007fff63df0cd8 RCX: 0000000000467b97
[   55.052660][ T5004] RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000040000000
[   55.060799][ T5004] RBP: 00007fff63df0770 R08: 0000000000000000 R09: 0000000000000000
[   55.068886][ T5004] R10: 0000000000000000 R11: 0000000000000206 R12: 00000000ffffffff
[   55.076874][ T5004] R13: 000000000056cb88 R14: 0000000000000000 R15: 00000000000000f8
[   55.084960][ T5004]  </TASK>
[   55.088309][ T5004] Kernel Offset: disabled
[   55.093075][ T5004] 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-build2249697137=/tmp/go-build -gno-record-gcc-switches"

git status (err=<nil>)
HEAD detached at b599f2fcc
nothing to commit, working tree clean


go list -f '{{.Stale}}' ./sys/syz-sysgen | grep -q false || go install ./sys/syz-sysgen
make .descriptions
bin/syz-sysgen
touch .descriptions
GOOS=linux GOARCH=amd64 go build "-ldflags=-s -w -X github.com/google/syzkaller/prog.GitRevision=b599f2fcc734e2183016a340d4f6fc2891d8e41f -X 'github.com/google/syzkaller/prog.gitRevisionDate=20210819-171500'" "-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=b599f2fcc734e2183016a340d4f6fc2891d8e41f -X 'github.com/google/syzkaller/prog.gitRevisionDate=20210819-171500'" "-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=b599f2fcc734e2183016a340d4f6fc2891d8e41f -X 'github.com/google/syzkaller/prog.gitRevisionDate=20210819-171500'" "-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 -static -fpermissive -w -DGOOS_linux=1 -DGOARCH_amd64=1 \
	-DHOSTGOOS_linux=1 -DGIT_REVISION=\"b599f2fcc734e2183016a340d4f6fc2891d8e41f\"