x_tables: ip6_tables: TPROXY target: used from hooks FORWARD, but only usable from PREROUTING
==================================================================
BUG: KCSAN: data-race in console_flush_all / console_flush_all

write to 0xffffffff86a20878 of 8 bytes by task 6056 on cpu 0:
 console_emit_next_record kernel/printk/printk.c:3099 [inline]
 console_flush_all+0x35a/0x730 kernel/printk/printk.c:3226
 __console_flush_and_unlock kernel/printk/printk.c:3285 [inline]
 console_unlock+0xa1/0x330 kernel/printk/printk.c:3325
 vprintk_emit+0x388/0x650 kernel/printk/printk.c:2450
 dev_vprintk_emit+0x242/0x2a0 drivers/base/core.c:4914
 dev_printk_emit+0x84/0xb0 drivers/base/core.c:4925
 __dev_printk+0xf3/0x110 drivers/base/core.c:4937
 _dev_printk+0x96/0xc0 drivers/base/core.c:4954
 proc_do_submiturb+0x1a95/0x1d20 drivers/usb/core/devio.c:1975
 proc_submiturb+0x7b/0xa0 drivers/usb/core/devio.c:2003
 usbdev_do_ioctl drivers/usb/core/devio.c:2703 [inline]
 usbdev_ioctl+0xcc2/0x1710 drivers/usb/core/devio.c:2827
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:598 [inline]
 __se_sys_ioctl+0xce/0x140 fs/ioctl.c:584
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:584
 x64_sys_call+0x1816/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff86a20878 of 8 bytes by task 6050 on cpu 1:
 console_flush_all+0x563/0x730 kernel/printk/printk.c:3227
 __console_flush_and_unlock kernel/printk/printk.c:3285 [inline]
 console_unlock+0xa1/0x330 kernel/printk/printk.c:3325
 vprintk_emit+0x388/0x650 kernel/printk/printk.c:2450
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2465
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x79/0xa0 kernel/printk/printk.c:2475
 xt_check_target+0x461/0x4c0 net/netfilter/x_tables.c:-1
 check_target net/ipv6/netfilter/ip6_tables.c:528 [inline]
 find_check_entry net/ipv6/netfilter/ip6_tables.c:571 [inline]
 translate_table+0xcf5/0x1070 net/ipv6/netfilter/ip6_tables.c:733
 do_replace net/ipv6/netfilter/ip6_tables.c:1154 [inline]
 do_ip6t_set_ctl+0x678/0x840 net/ipv6/netfilter/ip6_tables.c:1644
 nf_setsockopt+0x196/0x1b0 net/netfilter/nf_sockopt.c:101
 ipv6_setsockopt+0x11a/0x130 net/ipv6/ipv6_sockglue.c:998
 tcp_setsockopt+0x95/0xb0 net/ipv4/tcp.c:4108
 sock_common_setsockopt+0x69/0x80 net/core/sock.c:3944
 do_sock_setsockopt net/socket.c:2342 [inline]
 __sys_setsockopt+0x184/0x200 net/socket.c:2367
 __do_sys_setsockopt net/socket.c:2373 [inline]
 __se_sys_setsockopt net/socket.c:2370 [inline]
 __x64_sys_setsockopt+0x64/0x80 net/socket.c:2370
 x64_sys_call+0x20ec/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:55
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000000001033 -> 0x0000000000001034

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 6050 Comm: syz.2.806 Not tainted 6.16.0-syzkaller-04405-g4b290aae788e #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
==================================================================