[Bug 279875] sockstat: segmentation fault

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=279875

            Bug ID: 279875
           Summary: sockstat: segmentation fault
           Product: Base System
           Version: 14.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: kirill@varnakov.com

Hi.

After upgrade to FreeBSD 14.0 I noticed in /var/log/messages rows like:

Jun 20 01:36:14 servername kernel: pid 74752 (sockstat), jid 1, uid 1003:
exited on signal 11 (no core dump - other error)
Jun 20 01:37:41 servername  kernel: pid 75150 (sockstat), jid 1, uid 1003:
exited on signal 11 (no core dump - other error)
Jun 20 01:38:51 servername  kernel: pid 75425 (sockstat), jid 1, uid 1003:
exited on signal 11 (no core dump - other error)
Jun 20 01:39:15 servername  kernel: pid 75587 (sockstat), jid 1, uid 1003:
exited on signal 11 (no core dump - other error)
Jun 20 01:44:02 servername  kernel: pid 76745 (sockstat), jid 1, uid 1003:
exited on signal 11 (no core dump - other error)

This happens after our script tries to parse sockstat output, but sometime it
crashes. Run sockstat without any arguments give same result. One remark that
server processes a lot of connections.

May be backtrace could help you:

Process 46451 stopped
* thread #1, name = 'sockstat.full', stop reason = signal SIGSEGV: invalid
address (fault address: 0x18)
    frame #0: 0x00001852b6abe497 sockstat.full`displaysock [inlined]
file_compare(a=<unavailable>, b=0x0000000000000000) at sockstat.c:179:38
(lldb) list
(lldb) bt
* thread #1, name = 'sockstat.full', stop reason = signal SIGSEGV: invalid
address (fault address: 0x18)
  * frame #0: 0x00001852b6abe497 sockstat.full`displaysock [inlined]
file_compare(a=<unavailable>, b=0x0000000000000000) at sockstat.c:179:38
    frame #1: 0x00001852b6abe497 sockstat.full`displaysock [inlined]
files_t_RB_FIND(head=<unavailable>, elm=<unavailable>) at sockstat.c:181:1
    frame #2: 0x00001852b6abe48e
sockstat.full`displaysock(s=0x000026891e269a40, pos=40) at sockstat.c:1165:10
    frame #3: 0x00001852b6abdc10 sockstat.full`display at sockstat.c:1364:3
    frame #4: 0x00001852b6abcbd8 sockstat.full`main(argc=<unavailable>,
argv=<unavailable>) at sockstat.c:1577:2
    frame #5: 0x0000185ada4cbafa libc.so.7`__libc_start1 + 298
    frame #6: 0x00001852b6abb17d sockstat.full`_start at crt1_s.S:83
(lldb)

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