[Bug 277009] panic: Assertion !callout_active(&tp->t_callout) failed

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277009

            Bug ID: 277009
           Summary: panic: Assertion !callout_active(&tp->t_callout)
                    failed
           Product: Base System
           Version: 15.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: cc@FreeBSD.org

Hit this panic on a fresh new freebsd 15-current VM. I will upload the
compressed crash folder containing the core file stuff once this PR is created.

panic: Assertion !callout_active(&tp->t_callout) failed at
/usr/src/sys/netinet/tcp_subr.c:2386
cpuid = 2
time = 1707765690
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe007eb17a80
vpanic() at vpanic+0x135/frame 0xfffffe007eb17bb0
panic() at panic+0x43/frame 0xfffffe007eb17c10
tcp_discardcb() at tcp_discardcb+0x251/frame 0xfffffe007eb17c60
tcp_usr_detach() at tcp_usr_detach+0x51/frame 0xfffffe007eb17c80
sorele_locked() at sorele_locked+0xd1/frame 0xfffffe007eb17cb0
soclose() at soclose+0x17d/frame 0xfffffe007eb17d10
_fdrop() at _fdrop+0x1b/frame 0xfffffe007eb17d30
closef() at closef+0x1e3/frame 0xfffffe007eb17dc0
closefp_impl() at closefp_impl+0x76/frame 0xfffffe007eb17e00
amd64_syscall() at amd64_syscall+0x153/frame 0xfffffe007eb17f30
fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe007eb17f30
--- syscall (6, FreeBSD ELF64, close), rip = 0x15306863c54a, rsp =
0x153063a18438, rbp = 0x153063a18450 ---
KDB: enter: panic
[ thread pid 5327 tid 100209 ]
Stopped at      kdb_enter+0x33: movq    $0,0xe39ce2(%rip)
db> dump
Dumping 391 out of 6111 MB:..5%..13%..21%..33%..41%..54%..62%..74%..82%..95%
Dump complete
db> 

root@n2fbsd:~ # uname -a
FreeBSD n2fbsd 15.0-CURRENT FreeBSD 15.0-CURRENT #3 main-n268194-114ab149e23e:
Mon Feb 12 13:02:35 EST 2024    
root@n2fbsd:/usr/obj/usr/src/amd64.amd64/sys/GENERIC amd64
root@n2fbsd:/var/crash # ll
total 302800
-rw-r--r--  1 root wheel    2B Feb 12 14:29 bounds
-rw-r--r--  1 root wheel    5B Jan 18 00:24 minfree
lrwxr-xr-x  1 root wheel    6B Feb 12 14:29 info.last -> info.0
lrwxr-xr-x  1 root wheel    8B Feb 12 14:29 vmcore.last -> vmcore.0
-rw-r--r--  1 root wheel   84B Feb 12 14:29 core.txt.0
-rw-------  1 root wheel  552B Feb 12 14:29 info.0
-rw-------  1 root wheel  391M Feb 12 14:29 vmcore.0

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