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: 5003 at net/sysctl_net.c:155 ensure_safe_net_sysctl net/sysctl_net.c:155 [inline] WARNING: CPU: 1 PID: 5003 at net/sysctl_net.c:155 register_net_sysctl+0x207/0x3c0 net/sysctl_net.c:167 Modules linked in: CPU: 1 PID: 5003 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:ffffc9000431fbf8 EFLAGS: 00010286 RAX: 0000000000000000 RBX: ffff88802b885854 RCX: 0000000000000000 RDX: ffff888025668000 RSI: ffffffff814bd247 RDI: 0000000000000001 RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: ffff88802b885848 R13: ffffffff8b859740 R14: 0000000000000000 R15: ffffffff8b69e220 FS: 00005555556f4400(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005569b5bf6048 CR3: 0000000070ac2000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: 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: 0033:0x7f312268d687 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:00007ffccb2c92a8 EFLAGS: 00000206 ORIG_RAX: 0000000000000110 RAX: ffffffffffffffda RBX: 00007ffccb2c98e8 RCX: 00007f312268d687 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000 RBP: 00000000ffffffff R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000003 R13: 00007ffccb2c9380 R14: 00007f31227ac9d8 R15: 000000000000000c Warning: Permanently added '10.128.1.107' (ECDSA) to the list of known hosts. 2023/05/16 09:51:38 fuzzer started 2023/05/16 09:51:38 connecting to host at 10.128.0.169:46207 2023/05/16 09:51:38 checking machine... 2023/05/16 09:51:38 checking revisions... 2023/05/16 09:51:38 testing simple program... syzkaller login: [ 61.471070][ T5000] cgroup: Unknown subsys name 'net' [ 61.644574][ T5000] cgroup: Unknown subsys name 'rlimit' [ 61.740753][ T4995] memfd_create() without MFD_EXEC nor MFD_NOEXEC_SEAL, pid=4995 'syz-fuzzer' [ 61.874427][ T5004] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1 [ 61.882874][ T5004] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9 [ 61.891021][ T5004] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9 [ 61.899600][ T5004] Bluetooth: hci0: unexpected cc 0x0c23 length: 249 > 4 [ 61.907341][ T5004] Bluetooth: hci0: unexpected cc 0x0c25 length: 249 > 3 [ 61.914726][ T5004] Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2 [ 61.943805][ T5003] ------------[ cut here ]------------ [ 61.949385][ T5003] sysctl net/ipv4/ipfrag_low_thresh: data points to kernel global data: ipfrag_low_thresh_unused [ 61.961327][ T5003] WARNING: CPU: 1 PID: 5003 at net/sysctl_net.c:155 register_net_sysctl+0x207/0x3c0 [ 61.970820][ T5003] Modules linked in: [ 61.975019][ T5003] CPU: 1 PID: 5003 Comm: syz-executor.0 Not tainted 6.4.0-rc2-next-20230516-syzkaller-02748-g885df05bf634 #0 [ 61.987075][ T5003] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023 [ 61.997394][ T5003] RIP: 0010:register_net_sysctl+0x207/0x3c0 [ 62.003530][ T5003] 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 [ 62.023310][ T5003] RSP: 0018:ffffc9000431fbf8 EFLAGS: 00010286 [ 62.029404][ T5003] RAX: 0000000000000000 RBX: ffff88802b885854 RCX: 0000000000000000 [ 62.037463][ T5003] RDX: ffff888025668000 RSI: ffffffff814bd247 RDI: 0000000000000001 [ 62.045592][ T5003] RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000 [ 62.053616][ T5003] R10: 0000000000000001 R11: 0000000000000001 R12: ffff88802b885848 [ 62.061604][ T5003] R13: ffffffff8b859740 R14: 0000000000000000 R15: ffffffff8b69e220 [ 62.069657][ T5003] FS: 00005555556f4400(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 [ 62.078783][ T5003] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 62.085445][ T5003] CR2: 00005569b5bf6048 CR3: 0000000070ac2000 CR4: 00000000003506e0 [ 62.093678][ T5003] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 62.101663][ T5003] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 62.109725][ T5003] Call Trace: [ 62.113073][ T5003] [ 62.116306][ T5003] ? ip4_frag_init+0x380/0x380 [ 62.121125][ T5003] ipv4_frags_init_net+0x269/0x430 [ 62.126317][ T5003] ops_init+0xb9/0x6b0 [ 62.130598][ T5003] setup_net+0x5d1/0xc50 [ 62.134905][ T5003] ? down_read_killable+0x14a/0x4f0 [ 62.140145][ T5003] ? ops_init+0x6b0/0x6b0 [ 62.144554][ T5003] copy_net_ns+0x4ee/0x8e0 [ 62.149009][ T5003] create_new_namespaces+0x3f6/0xb20 [ 62.154369][ T5003] unshare_nsproxy_namespaces+0xc1/0x1f0 [ 62.160079][ T5003] ksys_unshare+0x449/0x920 [ 62.164667][ T5003] ? unshare_fd+0x1c0/0x1c0 [ 62.169207][ T5003] ? unlock_page_memcg+0x3b0/0x3b0 [ 62.174393][ T5003] ? syscall_enter_from_user_mode+0x26/0x80 [ 62.180595][ T5003] __x64_sys_unshare+0x31/0x40 [ 62.185458][ T5003] do_syscall_64+0x39/0xb0 [ 62.189912][ T5003] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 62.195953][ T5003] RIP: 0033:0x7f312268d687 [ 62.200388][ T5003] 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 [ 62.220559][ T5003] RSP: 002b:00007ffccb2c92a8 EFLAGS: 00000206 ORIG_RAX: 0000000000000110 [ 62.229048][ T5003] RAX: ffffffffffffffda RBX: 00007ffccb2c98e8 RCX: 00007f312268d687 [ 62.237100][ T5003] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000 [ 62.251729][ T5003] RBP: 00000000ffffffff R08: 0000000000000000 R09: 0000000000000000 [ 62.259788][ T5003] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000003 [ 62.267944][ T5003] R13: 00007ffccb2c9380 R14: 00007f31227ac9d8 R15: 000000000000000c [ 62.276084][ T5003] [ 62.279553][ T5003] Kernel panic - not syncing: kernel: panic_on_warn set ... [ 62.286824][ T5003] CPU: 1 PID: 5003 Comm: syz-executor.0 Not tainted 6.4.0-rc2-next-20230516-syzkaller-02748-g885df05bf634 #0 [ 62.298383][ T5003] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023 [ 62.309267][ T5003] Call Trace: [ 62.312642][ T5003] [ 62.315668][ T5003] dump_stack_lvl+0xd9/0x150 [ 62.320362][ T5003] panic+0x686/0x730 [ 62.324524][ T5003] ? panic_smp_self_stop+0xa0/0xa0 [ 62.329661][ T5003] ? show_trace_log_lvl+0x285/0x390 [ 62.334890][ T5003] ? register_net_sysctl+0x207/0x3c0 [ 62.340191][ T5003] check_panic_on_warn+0xb1/0xc0 [ 62.345138][ T5003] __warn+0xf2/0x390 [ 62.349114][ T5003] ? preempt_schedule_notrace+0x5f/0xd0 [ 62.354754][ T5003] ? register_net_sysctl+0x207/0x3c0 [ 62.360062][ T5003] report_bug+0x2da/0x500 [ 62.365275][ T5003] handle_bug+0x3c/0x70 [ 62.369459][ T5003] exc_invalid_op+0x18/0x50 [ 62.374074][ T5003] asm_exc_invalid_op+0x1a/0x20 [ 62.379019][ T5003] RIP: 0010:register_net_sysctl+0x207/0x3c0 [ 62.384953][ T5003] 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 [ 62.404672][ T5003] RSP: 0018:ffffc9000431fbf8 EFLAGS: 00010286 [ 62.410759][ T5003] RAX: 0000000000000000 RBX: ffff88802b885854 RCX: 0000000000000000 [ 62.418732][ T5003] RDX: ffff888025668000 RSI: ffffffff814bd247 RDI: 0000000000000001 [ 62.426707][ T5003] RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000 [ 62.434701][ T5003] R10: 0000000000000001 R11: 0000000000000001 R12: ffff88802b885848 [ 62.442986][ T5003] R13: ffffffff8b859740 R14: 0000000000000000 R15: ffffffff8b69e220 [ 62.450989][ T5003] ? __warn_printk+0x187/0x310 [ 62.455786][ T5003] ? register_net_sysctl+0x207/0x3c0 [ 62.461657][ T5003] ? ip4_frag_init+0x380/0x380 [ 62.471044][ T5003] ipv4_frags_init_net+0x269/0x430 [ 62.476272][ T5003] ops_init+0xb9/0x6b0 [ 62.480489][ T5003] setup_net+0x5d1/0xc50 [ 62.484769][ T5003] ? down_read_killable+0x14a/0x4f0 [ 62.490107][ T5003] ? ops_init+0x6b0/0x6b0 [ 62.494466][ T5003] copy_net_ns+0x4ee/0x8e0 [ 62.498906][ T5003] create_new_namespaces+0x3f6/0xb20 [ 62.504335][ T5003] unshare_nsproxy_namespaces+0xc1/0x1f0 [ 62.510016][ T5003] ksys_unshare+0x449/0x920 [ 62.514654][ T5003] ? unshare_fd+0x1c0/0x1c0 [ 62.519195][ T5003] ? unlock_page_memcg+0x3b0/0x3b0 [ 62.524332][ T5003] ? syscall_enter_from_user_mode+0x26/0x80 [ 62.530262][ T5003] __x64_sys_unshare+0x31/0x40 [ 62.535042][ T5003] do_syscall_64+0x39/0xb0 [ 62.539467][ T5003] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 62.545375][ T5003] RIP: 0033:0x7f312268d687 [ 62.549793][ T5003] 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 [ 62.569500][ T5003] RSP: 002b:00007ffccb2c92a8 EFLAGS: 00000206 ORIG_RAX: 0000000000000110 [ 62.577923][ T5003] RAX: ffffffffffffffda RBX: 00007ffccb2c98e8 RCX: 00007f312268d687 [ 62.585992][ T5003] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000 [ 62.593964][ T5003] RBP: 00000000ffffffff R08: 0000000000000000 R09: 0000000000000000 [ 62.602121][ T5003] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000003 [ 62.610110][ T5003] R13: 00007ffccb2c9380 R14: 00007f31227ac9d8 R15: 000000000000000c [ 62.618113][ T5003] [ 62.621420][ T5003] Kernel Offset: disabled [ 62.626242][ T5003] Rebooting in 86400 seconds.. syzkaller build log: go env (err=) 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-build3132506128=/tmp/go-build -gno-record-gcc-switches" git status (err=) HEAD detached at 0a9c11b64 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=0a9c11b64c9f99ba6bf90f22430b6794577c7aeb -X 'github.com/google/syzkaller/prog.gitRevisionDate=20230206-133939'" "-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=0a9c11b64c9f99ba6bf90f22430b6794577c7aeb -X 'github.com/google/syzkaller/prog.gitRevisionDate=20230206-133939'" "-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=0a9c11b64c9f99ba6bf90f22430b6794577c7aeb -X 'github.com/google/syzkaller/prog.gitRevisionDate=20230206-133939'" "-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=\"0a9c11b64c9f99ba6bf90f22430b6794577c7aeb\"