[Bug 290092] panic after TCP syncache overflow detected

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=290092

            Bug ID: 290092
           Summary: panic after  TCP syncache overflow detected
           Product: Base System
           Version: 14.3-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: bsd@itglob.ru

uname -a :
FreeBSD gate 14.3-STABLE FreeBSD 14.3-STABLE #0 stable/14-1cc96642675b: Mon Oct
 6 23:39:08 MSK 2025     root@gate:/usr/obj/usr/src/amd64.amd64/sys/GATE_AMD64
amd64


Oct  7 15:47:53 o kernel: TCP syncache overflow detected; using syncookies for
the next 15 seconds
Oct  7 15:47:53 o kernel: 
Oct  7 15:47:53 o syslogd: last message repeated 1 times
Oct  7 15:47:53 o kernel: Fatal trap 12: page fault while in kernel mode
Oct  7 15:47:53 o kernel: cpuid = 2; apic id = 02
Oct  7 15:47:53 o kernel: fault virtual address = 0x0
Oct  7 15:47:53 o kernel: fault code            = supervisor read data, page
not present
Oct  7 15:47:53 o kernel: instruction pointer   = 0x20:0xffffffff80ba4cea
Oct  7 15:47:53 o kernel: stack pointer         = 0x28:0xfffffe00c61f5a60
Oct  7 15:47:53 o kernel: frame pointer         = 0x28:0xfffffe00c61f5a70
Oct  7 15:47:53 o kernel: code segment          = base 0x0, limit 0xfffff, type
0x1b
Oct  7 15:47:53 o kernel:                       = DPL 0, pres 1, long 1, def32
0, gran 1
Oct  7 15:47:53 o kernel: processor eflags      = interrupt enabled, resume,
IOPL = 0
Oct  7 15:47:53 o kernel: current process               = 12 (swi1: netisr 0)
Oct  7 15:47:53 o kernel: rdi: 0000000000000000 rsi: fffffe00dcb05660 rdx:
0000000000000000
Oct  7 15:47:53 o kernel: rcx: fffffe009e960ce0  r8: ffffffff80ba8b40  r9:
0000000000000004
Oct  7 15:47:53 o kernel: rax: fffffe014358b478 rbx: 0000000000000000 rbp:
fffffe00c61f5a70
Oct  7 15:47:53 o kernel: r10: 0000000000000001 r11: 0000000000000049 r12:
0000000000000000
Oct  7 15:47:53 o kernel: r13: fffff802c3a196e0 r14: fffff80001900000 r15:
fffff802c3a196e0
Oct  7 15:47:53 o kernel: trap number           = 12
Oct  7 15:47:53 o kernel: panic: page fault
Oct  7 15:47:53 o kernel: cpuid = 2
Oct  7 15:47:53 o kernel: time = 1759841217
Oct  7 15:47:53 o kernel: KDB: stack backtrace:
Oct  7 15:47:53 o kernel: #0 0xffffffff80a438bd at kdb_backtrace+0x5d
Oct  7 15:47:53 o kernel: #1 0xffffffff809f5111 at vpanic+0x161
Oct  7 15:47:53 o kernel: #2 0xffffffff809f4fa3 at panic+0x43
Oct  7 15:47:53 o kernel: #3 0xffffffff80e52d5a at trap_pfault+0x3da
Oct  7 15:47:53 o kernel: #4 0xffffffff80e28be8 at calltrap+0x8
Oct  7 15:47:53 o kernel: #5 0xffffffff80ba8285 at syncache_insert+0x75
Oct  7 15:47:53 o kernel: #6 0xffffffff80ba7679 at syncache_add+0xd39
Oct  7 15:47:53 o kernel: #7 0xffffffff80b8d1c3 at tcp_input_with_port+0x12c3
Oct  7 15:47:53 o kernel: #8 0xffffffff80b8d7bb at tcp_input+0xb
Oct  7 15:47:53 o kernel: #9 0xffffffff80b7d1a9 at ip_input+0x229
Oct  7 15:47:53 o kernel: #10 0xffffffff80b483e8 at swi_net+0x128
Oct  7 15:47:53 o kernel: #11 0xffffffff809b0809 at ithread_loop+0x239
Oct  7 15:47:53 o kernel: #12 0xffffffff809acde1 at fork_exit+0x81
Oct  7 15:47:53 o kernel: #13 0xffffffff80e29c0e at fork_trampoline+0xe

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