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: 5004 at net/sysctl_net.c:155 ensure_safe_net_sysctl net/sysctl_net.c:155 [inline]
WARNING: CPU: 1 PID: 5004 at net/sysctl_net.c:155 register_net_sysctl+0x207/0x3c0 net/sysctl_net.c:167
Modules linked in:
CPU: 1 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:ffffc90003a6fbf8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff888017280054 RCX: 0000000000000000
RDX: ffff888027879dc0 RSI: ffffffff814bd247 RDI: 0000000000000001
RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffff888017280048
R13: ffffffff8b859740 R14: 0000000000000000 R15: ffffffff8b69e220
FS:  0000000002442400(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000014a4320 CR3: 00000000702da000 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: 0033:0x467b97
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:00007fffdf375f08 EFLAGS: 00000202 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007fffdf376528 RCX: 0000000000467b97
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000040000000
RBP: 00007fffdf375fc0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 00000000ffffffff
R13: 000000000056cb88 R14: 0000000000000000 R15: 00000000000000f8
 </TASK>


Warning: Permanently added '10.128.1.39' (ECDSA) to the list of known hosts.
2023/05/16 19:01:28 ignoring optional flag "raw_cover"="false"
2023/05/16 19:01:28 ignoring optional flag "sandbox_arg"="0"
2023/05/16 19:01:28 fuzzer started
2023/05/16 19:01:28 connecting to host at 10.128.0.169:35781
2023/05/16 19:01:28 checking machine...
2023/05/16 19:01:28 checking revisions...
2023/05/16 19:01:28 testing simple program...
syzkaller login: [   57.153187][   T47] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[   57.161513][   T47] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[   57.169398][ T5005] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[   57.177661][ T5005] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4
[   57.185194][ T5005] Bluetooth: hci0: unexpected cc 0x0c25 length: 249 > 3
[   57.192606][ T5005] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2
[   57.218795][ T5004] ------------[ cut here ]------------
[   57.224524][ T5004] sysctl net/ipv4/ipfrag_low_thresh: data points to kernel global data: ipfrag_low_thresh_unused
[   57.235868][ T5004] WARNING: CPU: 1 PID: 5004 at net/sysctl_net.c:155 register_net_sysctl+0x207/0x3c0
[   57.245587][ T5004] Modules linked in:
[   57.249583][ T5004] CPU: 1 PID: 5004 Comm: syz-executor.0 Not tainted 6.4.0-rc2-next-20230516-syzkaller-02748-g885df05bf634 #0
[   57.261276][ T5004] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
[   57.271504][ T5004] RIP: 0010:register_net_sysctl+0x207/0x3c0
[   57.277471][ 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
[   57.297248][ T5004] RSP: 0018:ffffc90003a6fbf8 EFLAGS: 00010286
[   57.303504][ T5004] RAX: 0000000000000000 RBX: ffff888017280054 RCX: 0000000000000000
[   57.311555][ T5004] RDX: ffff888027879dc0 RSI: ffffffff814bd247 RDI: 0000000000000001
[   57.320291][ T5004] RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
[   57.328441][ T5004] R10: 0000000000000001 R11: 0000000000000001 R12: ffff888017280048
[   57.336452][ T5004] R13: ffffffff8b859740 R14: 0000000000000000 R15: ffffffff8b69e220
[   57.344481][ T5004] FS:  0000000002442400(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
[   57.353550][ T5004] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   57.360210][ T5004] CR2: 00000000014a4320 CR3: 00000000702da000 CR4: 00000000003506e0
[   57.368222][ T5004] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   57.376188][ T5004] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   57.384303][ T5004] Call Trace:
[   57.387637][ T5004]  <TASK>
[   57.390577][ T5004]  ? ip4_frag_init+0x380/0x380
[   57.395690][ T5004]  ipv4_frags_init_net+0x269/0x430
[   57.401542][ T5004]  ops_init+0xb9/0x6b0
[   57.405923][ T5004]  setup_net+0x5d1/0xc50
[   57.410293][ T5004]  ? down_read_killable+0x14a/0x4f0
[   57.415523][ T5004]  ? ops_init+0x6b0/0x6b0
[   57.419933][ T5004]  copy_net_ns+0x4ee/0x8e0
[   57.424389][ T5004]  create_new_namespaces+0x3f6/0xb20
[   57.429730][ T5004]  unshare_nsproxy_namespaces+0xc1/0x1f0
[   57.435404][ T5004]  ksys_unshare+0x449/0x920
[   57.439953][ T5004]  ? unshare_fd+0x1c0/0x1c0
[   57.444516][ T5004]  ? unlock_page_memcg+0x3b0/0x3b0
[   57.449688][ T5004]  ? syscall_enter_from_user_mode+0x26/0x80
[   57.455623][ T5004]  __x64_sys_unshare+0x31/0x40
[   57.460491][ T5004]  do_syscall_64+0x39/0xb0
[   57.465032][ T5004]  entry_SYSCALL_64_after_hwframe+0x63/0xcd
[   57.471000][ T5004] RIP: 0033:0x467b97
[   57.474916][ 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
[   57.495249][ T5004] RSP: 002b:00007fffdf375f08 EFLAGS: 00000202 ORIG_RAX: 0000000000000110
[   57.503720][ T5004] RAX: ffffffffffffffda RBX: 00007fffdf376528 RCX: 0000000000467b97
[   57.511761][ T5004] RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000040000000
[   57.519790][ T5004] RBP: 00007fffdf375fc0 R08: 0000000000000000 R09: 0000000000000000
[   57.527817][ T5004] R10: 0000000000000000 R11: 0000000000000202 R12: 00000000ffffffff
[   57.535804][ T5004] R13: 000000000056cb88 R14: 0000000000000000 R15: 00000000000000f8
[   57.543855][ T5004]  </TASK>
[   57.546931][ T5004] Kernel panic - not syncing: kernel: panic_on_warn set ...
[   57.554567][ T5004] CPU: 1 PID: 5004 Comm: syz-executor.0 Not tainted 6.4.0-rc2-next-20230516-syzkaller-02748-g885df05bf634 #0
[   57.566220][ T5004] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
[   57.577256][ T5004] Call Trace:
[   57.580526][ T5004]  <TASK>
[   57.583488][ T5004]  dump_stack_lvl+0xd9/0x150
[   57.588197][ T5004]  panic+0x686/0x730
[   57.592212][ T5004]  ? panic_smp_self_stop+0xa0/0xa0
[   57.597367][ T5004]  ? show_trace_log_lvl+0x285/0x390
[   57.602585][ T5004]  ? register_net_sysctl+0x207/0x3c0
[   57.607877][ T5004]  check_panic_on_warn+0xb1/0xc0
[   57.612816][ T5004]  __warn+0xf2/0x390
[   57.617071][ T5004]  ? preempt_schedule_notrace+0x5f/0xd0
[   57.622645][ T5004]  ? register_net_sysctl+0x207/0x3c0
[   57.627934][ T5004]  report_bug+0x2da/0x500
[   57.632273][ T5004]  handle_bug+0x3c/0x70
[   57.636419][ T5004]  exc_invalid_op+0x18/0x50
[   57.641002][ T5004]  asm_exc_invalid_op+0x1a/0x20
[   57.645855][ T5004] RIP: 0010:register_net_sysctl+0x207/0x3c0
[   57.651761][ 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
[   57.671805][ T5004] RSP: 0018:ffffc90003a6fbf8 EFLAGS: 00010286
[   57.677875][ T5004] RAX: 0000000000000000 RBX: ffff888017280054 RCX: 0000000000000000
[   57.685935][ T5004] RDX: ffff888027879dc0 RSI: ffffffff814bd247 RDI: 0000000000000001
[   57.693934][ T5004] RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
[   57.702013][ T5004] R10: 0000000000000001 R11: 0000000000000001 R12: ffff888017280048
[   57.710091][ T5004] R13: ffffffff8b859740 R14: 0000000000000000 R15: ffffffff8b69e220
[   57.718172][ T5004]  ? __warn_printk+0x187/0x310
[   57.722961][ T5004]  ? register_net_sysctl+0x207/0x3c0
[   57.728348][ T5004]  ? ip4_frag_init+0x380/0x380
[   57.733120][ T5004]  ipv4_frags_init_net+0x269/0x430
[   57.738256][ T5004]  ops_init+0xb9/0x6b0
[   57.742431][ T5004]  setup_net+0x5d1/0xc50
[   57.746795][ T5004]  ? down_read_killable+0x14a/0x4f0
[   57.752180][ T5004]  ? ops_init+0x6b0/0x6b0
[   57.756528][ T5004]  copy_net_ns+0x4ee/0x8e0
[   57.760967][ T5004]  create_new_namespaces+0x3f6/0xb20
[   57.766272][ T5004]  unshare_nsproxy_namespaces+0xc1/0x1f0
[   57.771955][ T5004]  ksys_unshare+0x449/0x920
[   57.776493][ T5004]  ? unshare_fd+0x1c0/0x1c0
[   57.781134][ T5004]  ? unlock_page_memcg+0x3b0/0x3b0
[   57.786266][ T5004]  ? syscall_enter_from_user_mode+0x26/0x80
[   57.792264][ T5004]  __x64_sys_unshare+0x31/0x40
[   57.797045][ T5004]  do_syscall_64+0x39/0xb0
[   57.801466][ T5004]  entry_SYSCALL_64_after_hwframe+0x63/0xcd
[   57.807361][ T5004] RIP: 0033:0x467b97
[   57.811261][ 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
[   57.830972][ T5004] RSP: 002b:00007fffdf375f08 EFLAGS: 00000202 ORIG_RAX: 0000000000000110
[   57.839750][ T5004] RAX: ffffffffffffffda RBX: 00007fffdf376528 RCX: 0000000000467b97
[   57.847734][ T5004] RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000040000000
[   57.855808][ T5004] RBP: 00007fffdf375fc0 R08: 0000000000000000 R09: 0000000000000000
[   57.863875][ T5004] R10: 0000000000000000 R11: 0000000000000202 R12: 00000000ffffffff
[   57.871863][ T5004] R13: 000000000056cb88 R14: 0000000000000000 R15: 00000000000000f8
[   57.879939][ T5004]  </TASK>
[   57.883128][ T5004] Kernel Offset: disabled
[   57.887560][ 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-build308385305=/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\"