Hello, syzbot found the following issue on: HEAD commit: 885df05bf634 Add linux-next specific files for 20230516 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=12231ff6280000 kernel config: https://syzkaller.appspot.com/x/.config?x=86a3ef42a1d1a23 dashboard link: https://syzkaller.appspot.com/bug?extid=a03fd670838d927d9cd8 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/72eb24cce47e/disk-885df05b.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/31443616abfe/vmlinux-885df05b.xz kernel image: https://storage.googleapis.com/syzbot-assets/ec388de48d44/bzImage-885df05b.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+a03fd670838d927d9cd8@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ 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 #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:ffffc90003f3fbf8 EFLAGS: 00010286 RAX: 0000000000000000 RBX: ffff888027a56854 RCX: 0000000000000000 RDX: ffff88807db13b80 RSI: ffffffff814bd247 RDI: 0000000000000001 RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: ffff888027a56848 R13: ffffffff8b859740 R14: 0000000000000000 R15: ffffffff8b69e220 FS: 000055555618a400(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f57f7ad4620 CR3: 00000000224ca000 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: 0033:0x7f57f6e8d727 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:00007fff9777e5b8 EFLAGS: 00000206 ORIG_RAX: 0000000000000110 RAX: ffffffffffffffda RBX: 00007fff9777ebf8 RCX: 00007f57f6e8d727 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000 RBP: 00000000ffffffff R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000003 R13: 00007fff9777e690 R14: 00007f57f6fac9d8 R15: 000000000000000c </TASK> --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the bug is already fixed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to change bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
